e0e6311b64
This is to have them available only where they are really required. Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
1820 lines
56 KiB
C
1820 lines
56 KiB
C
/*
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* Public Key layer for parsing key files and structures
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_PK_PARSE_C)
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#include "mbedtls/pk.h"
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#include "mbedtls/asn1.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "pk_internal.h"
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#include <string.h>
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#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
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#include "mbedtls/ecp.h"
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#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
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#include "pkwrite.h"
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#endif
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#if defined(MBEDTLS_ECP_LIGHT)
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#include "pk_internal.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_PEM_PARSE_C)
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#include "mbedtls/pem.h"
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#endif
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#if defined(MBEDTLS_PKCS5_C)
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#include "mbedtls/pkcs5.h"
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#endif
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#if defined(MBEDTLS_PKCS12_C)
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#include "mbedtls/pkcs12.h"
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "mbedtls/psa_util.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#endif
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#include "mbedtls/platform.h"
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/* Helper for Montgomery curves */
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#if defined(MBEDTLS_ECP_LIGHT) && defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
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#define MBEDTLS_PK_IS_RFC8410_GROUP_ID(id) \
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((id == MBEDTLS_ECP_DP_CURVE25519) || (id == MBEDTLS_ECP_DP_CURVE448))
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#endif /* MBEDTLS_ECP_LIGHT && MBEDTLS_PK_HAVE_RFC8410_CURVES */
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#if defined(MBEDTLS_FS_IO)
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/*
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* Load all data from a file into a given buffer.
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*
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* The file is expected to contain either PEM or DER encoded data.
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* A terminating null byte is always appended. It is included in the announced
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* length only if the data looks like it is PEM encoded.
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*/
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int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n)
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{
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FILE *f;
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long size;
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if ((f = fopen(path, "rb")) == NULL) {
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return MBEDTLS_ERR_PK_FILE_IO_ERROR;
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}
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/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
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mbedtls_setbuf(f, NULL);
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fseek(f, 0, SEEK_END);
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if ((size = ftell(f)) == -1) {
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fclose(f);
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return MBEDTLS_ERR_PK_FILE_IO_ERROR;
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}
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fseek(f, 0, SEEK_SET);
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*n = (size_t) size;
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if (*n + 1 == 0 ||
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(*buf = mbedtls_calloc(1, *n + 1)) == NULL) {
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fclose(f);
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return MBEDTLS_ERR_PK_ALLOC_FAILED;
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}
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if (fread(*buf, 1, *n, f) != *n) {
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fclose(f);
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mbedtls_platform_zeroize(*buf, *n);
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mbedtls_free(*buf);
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return MBEDTLS_ERR_PK_FILE_IO_ERROR;
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}
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fclose(f);
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(*buf)[*n] = '\0';
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if (strstr((const char *) *buf, "-----BEGIN ") != NULL) {
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++*n;
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}
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return 0;
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}
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/*
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* Load and parse a private key
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*/
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int mbedtls_pk_parse_keyfile(mbedtls_pk_context *ctx,
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const char *path, const char *pwd,
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int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t n;
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unsigned char *buf;
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if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
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return ret;
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}
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if (pwd == NULL) {
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ret = mbedtls_pk_parse_key(ctx, buf, n, NULL, 0, f_rng, p_rng);
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} else {
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ret = mbedtls_pk_parse_key(ctx, buf, n,
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(const unsigned char *) pwd, strlen(pwd), f_rng, p_rng);
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}
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mbedtls_platform_zeroize(buf, n);
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mbedtls_free(buf);
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return ret;
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}
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/*
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* Load and parse a public key
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*/
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int mbedtls_pk_parse_public_keyfile(mbedtls_pk_context *ctx, const char *path)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t n;
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unsigned char *buf;
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if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
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return ret;
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}
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ret = mbedtls_pk_parse_public_key(ctx, buf, n);
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mbedtls_platform_zeroize(buf, n);
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mbedtls_free(buf);
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return ret;
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}
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#endif /* MBEDTLS_FS_IO */
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#if defined(MBEDTLS_ECP_LIGHT)
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/* Minimally parse an ECParameters buffer to and mbedtls_asn1_buf
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*
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* ECParameters ::= CHOICE {
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* namedCurve OBJECT IDENTIFIER
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* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
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* -- implicitCurve NULL
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* }
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*/
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static int pk_get_ecparams(unsigned char **p, const unsigned char *end,
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mbedtls_asn1_buf *params)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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if (end - *p < 1) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_OUT_OF_DATA);
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}
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/* Tag may be either OID or SEQUENCE */
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params->tag = **p;
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if (params->tag != MBEDTLS_ASN1_OID
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#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
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&& params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
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#endif
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) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
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}
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if ((ret = mbedtls_asn1_get_tag(p, end, ¶ms->len, params->tag)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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params->p = *p;
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*p += params->len;
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if (*p != end) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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return 0;
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}
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#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
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/*
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* Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
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* WARNING: the resulting group should only be used with
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* pk_group_id_from_specified(), since its base point may not be set correctly
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* if it was encoded compressed.
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*
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* SpecifiedECDomain ::= SEQUENCE {
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* version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
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* fieldID FieldID {{FieldTypes}},
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* curve Curve,
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* base ECPoint,
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* order INTEGER,
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* cofactor INTEGER OPTIONAL,
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* hash HashAlgorithm OPTIONAL,
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* ...
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* }
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*
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* We only support prime-field as field type, and ignore hash and cofactor.
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*/
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static int pk_group_from_specified(const mbedtls_asn1_buf *params, mbedtls_ecp_group *grp)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char *p = params->p;
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const unsigned char *const end = params->p + params->len;
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const unsigned char *end_field, *end_curve;
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size_t len;
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int ver;
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/* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
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if ((ret = mbedtls_asn1_get_int(&p, end, &ver)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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if (ver < 1 || ver > 3) {
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return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
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}
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/*
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* FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
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* fieldType FIELD-ID.&id({IOSet}),
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* parameters FIELD-ID.&Type({IOSet}{@fieldType})
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* }
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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return ret;
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}
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end_field = p + len;
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/*
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* FIELD-ID ::= TYPE-IDENTIFIER
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* FieldTypes FIELD-ID ::= {
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* { Prime-p IDENTIFIED BY prime-field } |
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* { Characteristic-two IDENTIFIED BY characteristic-two-field }
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* }
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* prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end_field, &len, MBEDTLS_ASN1_OID)) != 0) {
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return ret;
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}
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if (len != MBEDTLS_OID_SIZE(MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD) ||
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memcmp(p, MBEDTLS_OID_ANSI_X9_62_PRIME_FIELD, len) != 0) {
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return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
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}
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p += len;
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/* Prime-p ::= INTEGER -- Field of size p. */
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if ((ret = mbedtls_asn1_get_mpi(&p, end_field, &grp->P)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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grp->pbits = mbedtls_mpi_bitlen(&grp->P);
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if (p != end_field) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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/*
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* Curve ::= SEQUENCE {
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* a FieldElement,
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* b FieldElement,
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* seed BIT STRING OPTIONAL
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* -- Shall be present if used in SpecifiedECDomain
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* -- with version equal to ecdpVer2 or ecdpVer3
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* }
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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return ret;
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}
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end_curve = p + len;
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/*
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* FieldElement ::= OCTET STRING
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* containing an integer in the case of a prime field
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0 ||
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(ret = mbedtls_mpi_read_binary(&grp->A, p, len)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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p += len;
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if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0 ||
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(ret = mbedtls_mpi_read_binary(&grp->B, p, len)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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p += len;
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/* Ignore seed BIT STRING OPTIONAL */
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if ((ret = mbedtls_asn1_get_tag(&p, end_curve, &len, MBEDTLS_ASN1_BIT_STRING)) == 0) {
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p += len;
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}
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if (p != end_curve) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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/*
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* ECPoint ::= OCTET STRING
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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if ((ret = mbedtls_ecp_point_read_binary(grp, &grp->G,
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(const unsigned char *) p, len)) != 0) {
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/*
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* If we can't read the point because it's compressed, cheat by
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* reading only the X coordinate and the parity bit of Y.
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*/
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if (ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE ||
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(p[0] != 0x02 && p[0] != 0x03) ||
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len != mbedtls_mpi_size(&grp->P) + 1 ||
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mbedtls_mpi_read_binary(&grp->G.X, p + 1, len - 1) != 0 ||
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mbedtls_mpi_lset(&grp->G.Y, p[0] - 2) != 0 ||
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mbedtls_mpi_lset(&grp->G.Z, 1) != 0) {
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return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
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}
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}
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p += len;
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/*
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* order INTEGER
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*/
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if ((ret = mbedtls_asn1_get_mpi(&p, end, &grp->N)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
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}
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grp->nbits = mbedtls_mpi_bitlen(&grp->N);
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/*
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* Allow optional elements by purposefully not enforcing p == end here.
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*/
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return 0;
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}
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|
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/*
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* Find the group id associated with an (almost filled) group as generated by
|
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* pk_group_from_specified(), or return an error if unknown.
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*/
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static int pk_group_id_from_group(const mbedtls_ecp_group *grp, mbedtls_ecp_group_id *grp_id)
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{
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int ret = 0;
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mbedtls_ecp_group ref;
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const mbedtls_ecp_group_id *id;
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mbedtls_ecp_group_init(&ref);
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for (id = mbedtls_ecp_grp_id_list(); *id != MBEDTLS_ECP_DP_NONE; id++) {
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/* Load the group associated to that id */
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mbedtls_ecp_group_free(&ref);
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MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&ref, *id));
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/* Compare to the group we were given, starting with easy tests */
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if (grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
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mbedtls_mpi_cmp_mpi(&grp->P, &ref.P) == 0 &&
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mbedtls_mpi_cmp_mpi(&grp->A, &ref.A) == 0 &&
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mbedtls_mpi_cmp_mpi(&grp->B, &ref.B) == 0 &&
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mbedtls_mpi_cmp_mpi(&grp->N, &ref.N) == 0 &&
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mbedtls_mpi_cmp_mpi(&grp->G.X, &ref.G.X) == 0 &&
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mbedtls_mpi_cmp_mpi(&grp->G.Z, &ref.G.Z) == 0 &&
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/* For Y we may only know the parity bit, so compare only that */
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mbedtls_mpi_get_bit(&grp->G.Y, 0) == mbedtls_mpi_get_bit(&ref.G.Y, 0)) {
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break;
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}
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}
|
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|
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cleanup:
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mbedtls_ecp_group_free(&ref);
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|
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*grp_id = *id;
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|
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if (ret == 0 && *id == MBEDTLS_ECP_DP_NONE) {
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ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
|
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}
|
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|
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return ret;
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}
|
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|
|
/*
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* Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
|
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*/
|
|
static int pk_group_id_from_specified(const mbedtls_asn1_buf *params,
|
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mbedtls_ecp_group_id *grp_id)
|
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{
|
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
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mbedtls_ecp_group grp;
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|
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mbedtls_ecp_group_init(&grp);
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if ((ret = pk_group_from_specified(params, &grp)) != 0) {
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goto cleanup;
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}
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|
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ret = pk_group_id_from_group(&grp, grp_id);
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|
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cleanup:
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/* The API respecting lifecycle for mbedtls_ecp_group struct is
|
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* _init(), _load() and _free(). In pk_group_id_from_specified() the
|
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* temporary grp breaks that flow and it's members are populated
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* by pk_group_id_from_group(). As such mbedtls_ecp_group_free()
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* which is assuming a group populated by _setup() may not clean-up
|
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* properly -> Manually free it's members.
|
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*/
|
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mbedtls_mpi_free(&grp.N);
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mbedtls_mpi_free(&grp.P);
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mbedtls_mpi_free(&grp.A);
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mbedtls_mpi_free(&grp.B);
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mbedtls_ecp_point_free(&grp.G);
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|
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return ret;
|
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}
|
|
#endif /* MBEDTLS_PK_PARSE_EC_EXTENDED */
|
|
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
/* Functions pk_use_ecparams() and pk_use_ecparams_rfc8410() update the
|
|
* ecp_keypair structure with proper group ID. The purpose of this helper
|
|
* function is to update ec_family and ec_bits accordingly. */
|
|
static int pk_update_psa_ecparams(mbedtls_pk_context *pk,
|
|
mbedtls_ecp_group_id grp_id)
|
|
{
|
|
psa_ecc_family_t ec_family;
|
|
size_t bits;
|
|
|
|
ec_family = mbedtls_ecc_group_to_psa(grp_id, &bits);
|
|
|
|
if ((pk->ec_family != 0) && (pk->ec_family != ec_family)) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
pk->ec_family = ec_family;
|
|
pk->ec_bits = bits;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
|
|
/*
|
|
* Use EC parameters to initialise an EC group
|
|
*
|
|
* ECParameters ::= CHOICE {
|
|
* namedCurve OBJECT IDENTIFIER
|
|
* specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
|
|
* -- implicitCurve NULL
|
|
*/
|
|
static int pk_use_ecparams(const mbedtls_asn1_buf *params, mbedtls_pk_context *pk)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ecp_group_id grp_id;
|
|
|
|
if (params->tag == MBEDTLS_ASN1_OID) {
|
|
if (mbedtls_oid_get_ec_grp(params, &grp_id) != 0) {
|
|
return MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE;
|
|
}
|
|
} else {
|
|
#if defined(MBEDTLS_PK_PARSE_EC_EXTENDED)
|
|
if ((ret = pk_group_id_from_specified(params, &grp_id)) != 0) {
|
|
return ret;
|
|
}
|
|
#else
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
#endif
|
|
}
|
|
|
|
/* grp may already be initialized; if so, make sure IDs match */
|
|
if (mbedtls_pk_ec_ro(*pk)->grp.id != MBEDTLS_ECP_DP_NONE &&
|
|
mbedtls_pk_ec_ro(*pk)->grp.id != grp_id) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
if ((ret = mbedtls_ecp_group_load(&(mbedtls_pk_ec_rw(*pk)->grp),
|
|
grp_id)) != 0) {
|
|
return ret;
|
|
}
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
ret = pk_update_psa_ecparams(pk, grp_id);
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helper function for deriving a public key from its private counterpart.
|
|
*/
|
|
static int pk_derive_public_key(mbedtls_pk_context *pk,
|
|
const unsigned char *d, size_t d_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
int ret;
|
|
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_status_t status, destruction_status;
|
|
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
|
|
size_t curve_bits;
|
|
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa(eck->grp.id, &curve_bits);
|
|
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
unsigned char key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
|
|
size_t key_len;
|
|
#endif /* !MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
|
|
|
|
(void) f_rng;
|
|
(void) p_rng;
|
|
|
|
psa_set_key_type(&key_attr, PSA_KEY_TYPE_ECC_KEY_PAIR(curve));
|
|
psa_set_key_usage_flags(&key_attr, PSA_KEY_USAGE_EXPORT);
|
|
|
|
status = psa_import_key(&key_attr, d, d_len, &key_id);
|
|
ret = psa_pk_status_to_mbedtls(status);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
status = psa_export_public_key(key_id, pk->pub_raw, sizeof(pk->pub_raw),
|
|
&pk->pub_raw_len);
|
|
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
status = psa_export_public_key(key_id, key_buf, sizeof(key_buf), &key_len);
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
ret = psa_pk_status_to_mbedtls(status);
|
|
destruction_status = psa_destroy_key(key_id);
|
|
if (ret != 0) {
|
|
return ret;
|
|
} else if (destruction_status != PSA_SUCCESS) {
|
|
return psa_pk_status_to_mbedtls(destruction_status);
|
|
}
|
|
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
ret = mbedtls_ecp_point_read_binary(&eck->grp, &eck->Q, key_buf, key_len);
|
|
#endif /* !MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
#else /* MBEDTLS_USE_PSA_CRYPTO */
|
|
(void) d;
|
|
(void) d_len;
|
|
|
|
ret = mbedtls_ecp_mul(&eck->grp, &eck->Q, &eck->d, &eck->grp.G, f_rng, p_rng);
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
|
|
|
|
/*
|
|
* Load an RFC8410 EC key, which doesn't have any parameters
|
|
*/
|
|
static int pk_use_ecparams_rfc8410(const mbedtls_asn1_buf *params,
|
|
mbedtls_ecp_group_id grp_id,
|
|
mbedtls_pk_context *pk)
|
|
{
|
|
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec_rw(*pk);
|
|
int ret;
|
|
|
|
if (params->tag != 0 || params->len != 0) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
ret = mbedtls_ecp_group_load(&(ecp->grp), grp_id);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
ret = pk_update_psa_ecparams(pk, grp_id);
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Parse an RFC 8410 encoded private EC key
|
|
*
|
|
* CurvePrivateKey ::= OCTET STRING
|
|
*/
|
|
static int pk_parse_key_rfc8410_der(mbedtls_pk_context *pk,
|
|
unsigned char *key, size_t keylen, const unsigned char *end,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
mbedtls_ecp_keypair *eck = mbedtls_pk_ec_rw(*pk);
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len;
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(&key, (key + keylen), &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (key + len != end) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
if ((ret = mbedtls_mpi_read_binary_le(&eck->d, key, len)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
/* pk_parse_key_pkcs8_unencrypted_der() only supports version 1 PKCS8 keys,
|
|
* which never contain a public key. As such, derive the public key
|
|
* unconditionally. */
|
|
if ((ret = pk_derive_public_key(pk, key, len, f_rng, p_rng)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_ecp_check_privkey(&eck->grp, &eck->d)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_PK_HAVE_RFC8410_CURVES */
|
|
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
/*
|
|
* Create a temporary ecp_keypair for converting an EC point in compressed
|
|
* format to an uncompressed one
|
|
*/
|
|
static int pk_convert_compressed_ec(mbedtls_pk_context *pk,
|
|
const unsigned char *in_start, size_t in_len,
|
|
size_t *out_buf_len, unsigned char *out_buf,
|
|
size_t out_buf_size)
|
|
{
|
|
mbedtls_ecp_keypair ecp_key;
|
|
mbedtls_ecp_group_id ecp_group_id;
|
|
int ret;
|
|
|
|
ecp_group_id = mbedtls_ecc_group_of_psa(pk->ec_family, pk->ec_bits, 0);
|
|
|
|
mbedtls_ecp_keypair_init(&ecp_key);
|
|
ret = mbedtls_ecp_group_load(&(ecp_key.grp), ecp_group_id);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
ret = mbedtls_ecp_point_read_binary(&(ecp_key.grp), &ecp_key.Q,
|
|
in_start, in_len);
|
|
if (ret != 0) {
|
|
goto exit;
|
|
}
|
|
ret = mbedtls_ecp_point_write_binary(&(ecp_key.grp), &ecp_key.Q,
|
|
MBEDTLS_ECP_PF_UNCOMPRESSED,
|
|
out_buf_len, out_buf, out_buf_size);
|
|
|
|
exit:
|
|
mbedtls_ecp_keypair_free(&ecp_key);
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
|
|
/*
|
|
* EC public key is an EC point
|
|
*
|
|
* The caller is responsible for clearing the structure upon failure if
|
|
* desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
|
|
* return code of mbedtls_ecp_point_read_binary() and leave p in a usable state.
|
|
*/
|
|
static int pk_get_ecpubkey(unsigned char **p, const unsigned char *end,
|
|
mbedtls_pk_context *pk)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
|
|
mbedtls_svc_key_id_t key;
|
|
psa_key_attributes_t key_attrs = PSA_KEY_ATTRIBUTES_INIT;
|
|
size_t len = (end - *p);
|
|
|
|
if (len > PSA_EXPORT_PUBLIC_KEY_MAX_SIZE) {
|
|
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
|
|
}
|
|
|
|
/* Compressed point format are not supported yet by PSA crypto. As a
|
|
* consequence ecp functions are used to "convert" the point to
|
|
* uncompressed format */
|
|
if ((**p == 0x02) || (**p == 0x03)) {
|
|
ret = pk_convert_compressed_ec(pk, *p, len,
|
|
&(pk->pub_raw_len), pk->pub_raw,
|
|
PSA_EXPORT_PUBLIC_KEY_MAX_SIZE);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
} else {
|
|
/* Uncompressed format */
|
|
if ((end - *p) > MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN) {
|
|
return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
|
|
}
|
|
memcpy(pk->pub_raw, *p, (end - *p));
|
|
pk->pub_raw_len = end - *p;
|
|
}
|
|
|
|
/* Validate the key by trying to importing it */
|
|
psa_set_key_usage_flags(&key_attrs, 0);
|
|
psa_set_key_algorithm(&key_attrs, PSA_ALG_ECDSA_ANY);
|
|
psa_set_key_type(&key_attrs, PSA_KEY_TYPE_ECC_PUBLIC_KEY(pk->ec_family));
|
|
psa_set_key_bits(&key_attrs, pk->ec_bits);
|
|
|
|
if ((psa_import_key(&key_attrs, pk->pub_raw, pk->pub_raw_len,
|
|
&key) != PSA_SUCCESS) ||
|
|
(psa_destroy_key(key) != PSA_SUCCESS)) {
|
|
mbedtls_platform_zeroize(pk->pub_raw, MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN);
|
|
pk->pub_raw_len = 0;
|
|
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
|
|
}
|
|
ret = 0;
|
|
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
mbedtls_ecp_keypair *ec_key = (mbedtls_ecp_keypair *) pk->pk_ctx;
|
|
if ((ret = mbedtls_ecp_point_read_binary(&ec_key->grp, &ec_key->Q,
|
|
(const unsigned char *) *p,
|
|
end - *p)) == 0) {
|
|
ret = mbedtls_ecp_check_pubkey(&ec_key->grp, &ec_key->Q);
|
|
}
|
|
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
|
|
|
|
/*
|
|
* We know mbedtls_ecp_point_read_binary consumed all bytes or failed
|
|
*/
|
|
*p = (unsigned char *) end;
|
|
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/*
|
|
* RSAPublicKey ::= SEQUENCE {
|
|
* modulus INTEGER, -- n
|
|
* publicExponent INTEGER -- e
|
|
* }
|
|
*/
|
|
static int pk_get_rsapubkey(unsigned char **p,
|
|
const unsigned char *end,
|
|
mbedtls_rsa_context *rsa)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len;
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
|
|
}
|
|
|
|
if (*p + len != end) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
/* Import N */
|
|
if ((ret = mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_INTEGER)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
|
|
}
|
|
|
|
if ((ret = mbedtls_rsa_import_raw(rsa, *p, len, NULL, 0, NULL, 0,
|
|
NULL, 0, NULL, 0)) != 0) {
|
|
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
|
|
}
|
|
|
|
*p += len;
|
|
|
|
/* Import E */
|
|
if ((ret = mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_INTEGER)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
|
|
}
|
|
|
|
if ((ret = mbedtls_rsa_import_raw(rsa, NULL, 0, NULL, 0, NULL, 0,
|
|
NULL, 0, *p, len)) != 0) {
|
|
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
|
|
}
|
|
|
|
*p += len;
|
|
|
|
if (mbedtls_rsa_complete(rsa) != 0 ||
|
|
mbedtls_rsa_check_pubkey(rsa) != 0) {
|
|
return MBEDTLS_ERR_PK_INVALID_PUBKEY;
|
|
}
|
|
|
|
if (*p != end) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
/* Get a PK algorithm identifier
|
|
*
|
|
* AlgorithmIdentifier ::= SEQUENCE {
|
|
* algorithm OBJECT IDENTIFIER,
|
|
* parameters ANY DEFINED BY algorithm OPTIONAL }
|
|
*/
|
|
static int pk_get_pk_alg(unsigned char **p,
|
|
const unsigned char *end,
|
|
mbedtls_pk_type_t *pk_alg, mbedtls_asn1_buf *params,
|
|
mbedtls_ecp_group_id *ec_grp_id)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_asn1_buf alg_oid;
|
|
|
|
memset(params, 0, sizeof(mbedtls_asn1_buf));
|
|
|
|
if ((ret = mbedtls_asn1_get_alg(p, end, &alg_oid, params)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_ALG, ret);
|
|
}
|
|
|
|
ret = mbedtls_oid_get_pk_alg(&alg_oid, pk_alg);
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
if (ret == MBEDTLS_ERR_OID_NOT_FOUND) {
|
|
ret = mbedtls_oid_get_ec_grp_algid(&alg_oid, ec_grp_id);
|
|
if (ret == 0) {
|
|
*pk_alg = MBEDTLS_PK_ECKEY;
|
|
}
|
|
}
|
|
#else
|
|
(void) ec_grp_id;
|
|
#endif
|
|
if (ret != 0) {
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
}
|
|
|
|
/*
|
|
* No parameters with RSA (only for EC)
|
|
*/
|
|
if (*pk_alg == MBEDTLS_PK_RSA &&
|
|
((params->tag != MBEDTLS_ASN1_NULL && params->tag != 0) ||
|
|
params->len != 0)) {
|
|
return MBEDTLS_ERR_PK_INVALID_ALG;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* SubjectPublicKeyInfo ::= SEQUENCE {
|
|
* algorithm AlgorithmIdentifier,
|
|
* subjectPublicKey BIT STRING }
|
|
*/
|
|
int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end,
|
|
mbedtls_pk_context *pk)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len;
|
|
mbedtls_asn1_buf alg_params;
|
|
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
|
|
mbedtls_ecp_group_id ec_grp_id = MBEDTLS_ECP_DP_NONE;
|
|
const mbedtls_pk_info_t *pk_info;
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
end = *p + len;
|
|
|
|
if ((ret = pk_get_pk_alg(p, end, &pk_alg, &alg_params, &ec_grp_id)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_asn1_get_bitstring_null(p, end, &len)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
|
|
}
|
|
|
|
if (*p + len != end) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
if ((pk_info = mbedtls_pk_info_from_type(pk_alg)) == NULL) {
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
}
|
|
|
|
if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if (pk_alg == MBEDTLS_PK_RSA) {
|
|
ret = pk_get_rsapubkey(p, end, mbedtls_pk_rsa(*pk));
|
|
} else
|
|
#endif /* MBEDTLS_RSA_C */
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
if (pk_alg == MBEDTLS_PK_ECKEY_DH || pk_alg == MBEDTLS_PK_ECKEY) {
|
|
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
|
|
if (mbedtls_pk_is_rfc8410_curve(ec_grp_id)) {
|
|
ret = pk_use_ecparams_rfc8410(&alg_params, ec_grp_id, pk);
|
|
} else
|
|
#endif
|
|
{
|
|
ret = pk_use_ecparams(&alg_params, pk);
|
|
}
|
|
if (ret == 0) {
|
|
ret = pk_get_ecpubkey(p, end, pk);
|
|
}
|
|
} else
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
ret = MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
|
|
if (ret == 0 && *p != end) {
|
|
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
if (ret != 0) {
|
|
mbedtls_pk_free(pk);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/*
|
|
* Wrapper around mbedtls_asn1_get_mpi() that rejects zero.
|
|
*
|
|
* The value zero is:
|
|
* - never a valid value for an RSA parameter
|
|
* - interpreted as "omitted, please reconstruct" by mbedtls_rsa_complete().
|
|
*
|
|
* Since values can't be omitted in PKCS#1, passing a zero value to
|
|
* rsa_complete() would be incorrect, so reject zero values early.
|
|
*/
|
|
static int asn1_get_nonzero_mpi(unsigned char **p,
|
|
const unsigned char *end,
|
|
mbedtls_mpi *X)
|
|
{
|
|
int ret;
|
|
|
|
ret = mbedtls_asn1_get_mpi(p, end, X);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (mbedtls_mpi_cmp_int(X, 0) == 0) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse a PKCS#1 encoded private RSA key
|
|
*/
|
|
static int pk_parse_key_pkcs1_der(mbedtls_rsa_context *rsa,
|
|
const unsigned char *key,
|
|
size_t keylen)
|
|
{
|
|
int ret, version;
|
|
size_t len;
|
|
unsigned char *p, *end;
|
|
|
|
mbedtls_mpi T;
|
|
mbedtls_mpi_init(&T);
|
|
|
|
p = (unsigned char *) key;
|
|
end = p + keylen;
|
|
|
|
/*
|
|
* This function parses the RSAPrivateKey (PKCS#1)
|
|
*
|
|
* RSAPrivateKey ::= SEQUENCE {
|
|
* version Version,
|
|
* modulus INTEGER, -- n
|
|
* publicExponent INTEGER, -- e
|
|
* privateExponent INTEGER, -- d
|
|
* prime1 INTEGER, -- p
|
|
* prime2 INTEGER, -- q
|
|
* exponent1 INTEGER, -- d mod (p-1)
|
|
* exponent2 INTEGER, -- d mod (q-1)
|
|
* coefficient INTEGER, -- (inverse of q) mod p
|
|
* otherPrimeInfos OtherPrimeInfos OPTIONAL
|
|
* }
|
|
*/
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if ((ret = mbedtls_asn1_get_int(&p, end, &version)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (version != 0) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_VERSION;
|
|
}
|
|
|
|
/* Import N */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_rsa_import(rsa, &T, NULL, NULL,
|
|
NULL, NULL)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import E */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_rsa_import(rsa, NULL, NULL, NULL,
|
|
NULL, &T)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import D */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_rsa_import(rsa, NULL, NULL, NULL,
|
|
&T, NULL)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import P */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_rsa_import(rsa, NULL, &T, NULL,
|
|
NULL, NULL)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import Q */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_rsa_import(rsa, NULL, NULL, &T,
|
|
NULL, NULL)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
#if !defined(MBEDTLS_RSA_NO_CRT) && !defined(MBEDTLS_RSA_ALT)
|
|
/*
|
|
* The RSA CRT parameters DP, DQ and QP are nominally redundant, in
|
|
* that they can be easily recomputed from D, P and Q. However by
|
|
* parsing them from the PKCS1 structure it is possible to avoid
|
|
* recalculating them which both reduces the overhead of loading
|
|
* RSA private keys into memory and also avoids side channels which
|
|
* can arise when computing those values, since all of D, P, and Q
|
|
* are secret. See https://eprint.iacr.org/2020/055 for a
|
|
* description of one such attack.
|
|
*/
|
|
|
|
/* Import DP */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_mpi_copy(&rsa->DP, &T)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import DQ */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_mpi_copy(&rsa->DQ, &T)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Import QP */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = mbedtls_mpi_copy(&rsa->QP, &T)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
#else
|
|
/* Verify existence of the CRT params */
|
|
if ((ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0 ||
|
|
(ret = asn1_get_nonzero_mpi(&p, end, &T)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
#endif
|
|
|
|
/* rsa_complete() doesn't complete anything with the default
|
|
* implementation but is still called:
|
|
* - for the benefit of alternative implementation that may want to
|
|
* pre-compute stuff beyond what's provided (eg Montgomery factors)
|
|
* - as is also sanity-checks the key
|
|
*
|
|
* Furthermore, we also check the public part for consistency with
|
|
* mbedtls_pk_parse_pubkey(), as it includes size minima for example.
|
|
*/
|
|
if ((ret = mbedtls_rsa_complete(rsa)) != 0 ||
|
|
(ret = mbedtls_rsa_check_pubkey(rsa)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
if (p != end) {
|
|
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
cleanup:
|
|
|
|
mbedtls_mpi_free(&T);
|
|
|
|
if (ret != 0) {
|
|
/* Wrap error code if it's coming from a lower level */
|
|
if ((ret & 0xff80) == 0) {
|
|
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
} else {
|
|
ret = MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
mbedtls_rsa_free(rsa);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
/*
|
|
* Parse a SEC1 encoded private EC key
|
|
*/
|
|
static int pk_parse_key_sec1_der(mbedtls_pk_context *pk,
|
|
const unsigned char *key, size_t keylen,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
int version, pubkey_done;
|
|
size_t len, d_len;
|
|
mbedtls_asn1_buf params = { 0, 0, NULL };
|
|
unsigned char *p = (unsigned char *) key;
|
|
unsigned char *d;
|
|
unsigned char *end = p + keylen;
|
|
unsigned char *end2;
|
|
mbedtls_ecp_keypair *eck = mbedtls_pk_ec_rw(*pk);
|
|
|
|
/*
|
|
* RFC 5915, or SEC1 Appendix C.4
|
|
*
|
|
* ECPrivateKey ::= SEQUENCE {
|
|
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
|
|
* privateKey OCTET STRING,
|
|
* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
|
|
* publicKey [1] BIT STRING OPTIONAL
|
|
* }
|
|
*/
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if ((ret = mbedtls_asn1_get_int(&p, end, &version)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (version != 1) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_VERSION;
|
|
}
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
d = p;
|
|
d_len = len;
|
|
if ((ret = mbedtls_mpi_read_binary(&eck->d, p, len)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
p += len;
|
|
|
|
pubkey_done = 0;
|
|
if (p != end) {
|
|
/*
|
|
* Is 'parameters' present?
|
|
*/
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
|
|
0)) == 0) {
|
|
if ((ret = pk_get_ecparams(&p, p + len, ¶ms)) != 0 ||
|
|
(ret = pk_use_ecparams(¶ms, pk)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return ret;
|
|
}
|
|
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
}
|
|
|
|
if (p != end) {
|
|
/*
|
|
* Is 'publickey' present? If not, or if we can't read it (eg because it
|
|
* is compressed), create it from the private key.
|
|
*/
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
|
|
1)) == 0) {
|
|
end2 = p + len;
|
|
|
|
if ((ret = mbedtls_asn1_get_bitstring_null(&p, end2, &len)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (p + len != end2) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
|
|
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
|
|
}
|
|
|
|
if ((ret = pk_get_ecpubkey(&p, end2, pk)) == 0) {
|
|
pubkey_done = 1;
|
|
} else {
|
|
/*
|
|
* The only acceptable failure mode of pk_get_ecpubkey() above
|
|
* is if the point format is not recognized.
|
|
*/
|
|
if (ret != MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
}
|
|
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
}
|
|
|
|
if (!pubkey_done) {
|
|
if ((ret = pk_derive_public_key(pk, d, d_len, f_rng, p_rng)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if ((ret = mbedtls_ecp_check_privkey(&eck->grp, &eck->d)) != 0) {
|
|
mbedtls_ecp_keypair_free(eck);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
|
|
/*
|
|
* Parse an unencrypted PKCS#8 encoded private key
|
|
*
|
|
* Notes:
|
|
*
|
|
* - This function does not own the key buffer. It is the
|
|
* responsibility of the caller to take care of zeroizing
|
|
* and freeing it after use.
|
|
*
|
|
* - The function is responsible for freeing the provided
|
|
* PK context on failure.
|
|
*
|
|
*/
|
|
static int pk_parse_key_pkcs8_unencrypted_der(
|
|
mbedtls_pk_context *pk,
|
|
const unsigned char *key, size_t keylen,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
int ret, version;
|
|
size_t len;
|
|
mbedtls_asn1_buf params;
|
|
unsigned char *p = (unsigned char *) key;
|
|
unsigned char *end = p + keylen;
|
|
mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
|
|
mbedtls_ecp_group_id ec_grp_id = MBEDTLS_ECP_DP_NONE;
|
|
const mbedtls_pk_info_t *pk_info;
|
|
|
|
#if !defined(MBEDTLS_ECP_LIGHT)
|
|
(void) f_rng;
|
|
(void) p_rng;
|
|
#endif
|
|
|
|
/*
|
|
* This function parses the PrivateKeyInfo object (PKCS#8 v1.2 = RFC 5208)
|
|
*
|
|
* PrivateKeyInfo ::= SEQUENCE {
|
|
* version Version,
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
|
|
* privateKey PrivateKey,
|
|
* attributes [0] IMPLICIT Attributes OPTIONAL }
|
|
*
|
|
* Version ::= INTEGER
|
|
* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
* PrivateKey ::= OCTET STRING
|
|
*
|
|
* The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
|
|
*/
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if ((ret = mbedtls_asn1_get_int(&p, end, &version)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (version != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_VERSION, ret);
|
|
}
|
|
|
|
if ((ret = pk_get_pk_alg(&p, end, &pk_alg, ¶ms, &ec_grp_id)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if (len < 1) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT,
|
|
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
|
|
}
|
|
|
|
if ((pk_info = mbedtls_pk_info_from_type(pk_alg)) == NULL) {
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
}
|
|
|
|
if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if (pk_alg == MBEDTLS_PK_RSA) {
|
|
if ((ret = pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk), p, len)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
return ret;
|
|
}
|
|
} else
|
|
#endif /* MBEDTLS_RSA_C */
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
if (pk_alg == MBEDTLS_PK_ECKEY || pk_alg == MBEDTLS_PK_ECKEY_DH) {
|
|
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
|
|
if (mbedtls_pk_is_rfc8410_curve(ec_grp_id)) {
|
|
if ((ret =
|
|
pk_use_ecparams_rfc8410(¶ms, ec_grp_id, pk)) != 0 ||
|
|
(ret =
|
|
pk_parse_key_rfc8410_der(pk, p, len, end, f_rng,
|
|
p_rng)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
return ret;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
if ((ret = pk_use_ecparams(¶ms, pk)) != 0 ||
|
|
(ret = pk_parse_key_sec1_der(pk, p, len, f_rng, p_rng)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
return ret;
|
|
}
|
|
}
|
|
} else
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse an encrypted PKCS#8 encoded private key
|
|
*
|
|
* To save space, the decryption happens in-place on the given key buffer.
|
|
* Also, while this function may modify the keybuffer, it doesn't own it,
|
|
* and instead it is the responsibility of the caller to zeroize and properly
|
|
* free it after use.
|
|
*
|
|
*/
|
|
#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
|
|
static int pk_parse_key_pkcs8_encrypted_der(
|
|
mbedtls_pk_context *pk,
|
|
unsigned char *key, size_t keylen,
|
|
const unsigned char *pwd, size_t pwdlen,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
int ret, decrypted = 0;
|
|
size_t len;
|
|
unsigned char *buf;
|
|
unsigned char *p, *end;
|
|
mbedtls_asn1_buf pbe_alg_oid, pbe_params;
|
|
#if defined(MBEDTLS_PKCS12_C)
|
|
mbedtls_cipher_type_t cipher_alg;
|
|
mbedtls_md_type_t md_alg;
|
|
#endif
|
|
|
|
p = key;
|
|
end = p + keylen;
|
|
|
|
if (pwdlen == 0) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_REQUIRED;
|
|
}
|
|
|
|
/*
|
|
* This function parses the EncryptedPrivateKeyInfo object (PKCS#8)
|
|
*
|
|
* EncryptedPrivateKeyInfo ::= SEQUENCE {
|
|
* encryptionAlgorithm EncryptionAlgorithmIdentifier,
|
|
* encryptedData EncryptedData
|
|
* }
|
|
*
|
|
* EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
|
|
*
|
|
* EncryptedData ::= OCTET STRING
|
|
*
|
|
* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
|
|
*
|
|
*/
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
|
|
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
end = p + len;
|
|
|
|
if ((ret = mbedtls_asn1_get_alg(&p, end, &pbe_alg_oid, &pbe_params)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
|
|
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret);
|
|
}
|
|
|
|
buf = p;
|
|
|
|
/*
|
|
* Decrypt EncryptedData with appropriate PBE
|
|
*/
|
|
#if defined(MBEDTLS_PKCS12_C)
|
|
if (mbedtls_oid_get_pkcs12_pbe_alg(&pbe_alg_oid, &md_alg, &cipher_alg) == 0) {
|
|
if ((ret = mbedtls_pkcs12_pbe(&pbe_params, MBEDTLS_PKCS12_PBE_DECRYPT,
|
|
cipher_alg, md_alg,
|
|
pwd, pwdlen, p, len, buf)) != 0) {
|
|
if (ret == MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_MISMATCH;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
decrypted = 1;
|
|
} else
|
|
#endif /* MBEDTLS_PKCS12_C */
|
|
#if defined(MBEDTLS_PKCS5_C)
|
|
if (MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS5_PBES2, &pbe_alg_oid) == 0) {
|
|
if ((ret = mbedtls_pkcs5_pbes2(&pbe_params, MBEDTLS_PKCS5_DECRYPT, pwd, pwdlen,
|
|
p, len, buf)) != 0) {
|
|
if (ret == MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_MISMATCH;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
decrypted = 1;
|
|
} else
|
|
#endif /* MBEDTLS_PKCS5_C */
|
|
{
|
|
((void) pwd);
|
|
}
|
|
|
|
if (decrypted == 0) {
|
|
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
return pk_parse_key_pkcs8_unencrypted_der(pk, buf, len, f_rng, p_rng);
|
|
}
|
|
#endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
|
|
|
|
/*
|
|
* Parse a private key
|
|
*/
|
|
int mbedtls_pk_parse_key(mbedtls_pk_context *pk,
|
|
const unsigned char *key, size_t keylen,
|
|
const unsigned char *pwd, size_t pwdlen,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
const mbedtls_pk_info_t *pk_info;
|
|
#if defined(MBEDTLS_PEM_PARSE_C)
|
|
size_t len;
|
|
mbedtls_pem_context pem;
|
|
#endif
|
|
|
|
if (keylen == 0) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PEM_PARSE_C)
|
|
mbedtls_pem_init(&pem);
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN RSA PRIVATE KEY-----",
|
|
"-----END RSA PRIVATE KEY-----",
|
|
key, pwd, pwdlen, &len);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA);
|
|
if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0 ||
|
|
(ret = pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk),
|
|
pem.buf, pem.buflen)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
}
|
|
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_MISMATCH;
|
|
} else if (ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_REQUIRED;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN EC PRIVATE KEY-----",
|
|
"-----END EC PRIVATE KEY-----",
|
|
key, pwd, pwdlen, &len);
|
|
}
|
|
if (ret == 0) {
|
|
pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY);
|
|
|
|
if ((ret = mbedtls_pk_setup(pk, pk_info)) != 0 ||
|
|
(ret = pk_parse_key_sec1_der(pk,
|
|
pem.buf, pem.buflen,
|
|
f_rng, p_rng)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
}
|
|
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret == MBEDTLS_ERR_PEM_PASSWORD_MISMATCH) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_MISMATCH;
|
|
} else if (ret == MBEDTLS_ERR_PEM_PASSWORD_REQUIRED) {
|
|
return MBEDTLS_ERR_PK_PASSWORD_REQUIRED;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN PRIVATE KEY-----",
|
|
"-----END PRIVATE KEY-----",
|
|
key, NULL, 0, &len);
|
|
}
|
|
if (ret == 0) {
|
|
if ((ret = pk_parse_key_pkcs8_unencrypted_der(pk,
|
|
pem.buf, pem.buflen, f_rng, p_rng)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
}
|
|
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN ENCRYPTED PRIVATE KEY-----",
|
|
"-----END ENCRYPTED PRIVATE KEY-----",
|
|
key, NULL, 0, &len);
|
|
}
|
|
if (ret == 0) {
|
|
if ((ret = pk_parse_key_pkcs8_encrypted_der(pk, pem.buf, pem.buflen,
|
|
pwd, pwdlen, f_rng, p_rng)) != 0) {
|
|
mbedtls_pk_free(pk);
|
|
}
|
|
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
|
|
#else
|
|
((void) pwd);
|
|
((void) pwdlen);
|
|
#endif /* MBEDTLS_PEM_PARSE_C */
|
|
|
|
/*
|
|
* At this point we only know it's not a PEM formatted key. Could be any
|
|
* of the known DER encoded private key formats
|
|
*
|
|
* We try the different DER format parsers to see if one passes without
|
|
* error
|
|
*/
|
|
#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
|
|
if (pwdlen != 0) {
|
|
unsigned char *key_copy;
|
|
|
|
if ((key_copy = mbedtls_calloc(1, keylen)) == NULL) {
|
|
return MBEDTLS_ERR_PK_ALLOC_FAILED;
|
|
}
|
|
|
|
memcpy(key_copy, key, keylen);
|
|
|
|
ret = pk_parse_key_pkcs8_encrypted_der(pk, key_copy, keylen,
|
|
pwd, pwdlen, f_rng, p_rng);
|
|
|
|
mbedtls_platform_zeroize(key_copy, keylen);
|
|
mbedtls_free(key_copy);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
return 0;
|
|
}
|
|
|
|
mbedtls_pk_free(pk);
|
|
mbedtls_pk_init(pk);
|
|
|
|
if (ret == MBEDTLS_ERR_PK_PASSWORD_MISMATCH) {
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_PKCS12_C || MBEDTLS_PKCS5_C */
|
|
|
|
ret = pk_parse_key_pkcs8_unencrypted_der(pk, key, keylen, f_rng, p_rng);
|
|
if (ret == 0) {
|
|
return 0;
|
|
}
|
|
|
|
mbedtls_pk_free(pk);
|
|
mbedtls_pk_init(pk);
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
|
|
pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA);
|
|
if (mbedtls_pk_setup(pk, pk_info) == 0 &&
|
|
pk_parse_key_pkcs1_der(mbedtls_pk_rsa(*pk), key, keylen) == 0) {
|
|
return 0;
|
|
}
|
|
|
|
mbedtls_pk_free(pk);
|
|
mbedtls_pk_init(pk);
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_LIGHT)
|
|
pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY);
|
|
if (mbedtls_pk_setup(pk, pk_info) == 0 &&
|
|
pk_parse_key_sec1_der(pk,
|
|
key, keylen, f_rng, p_rng) == 0) {
|
|
return 0;
|
|
}
|
|
mbedtls_pk_free(pk);
|
|
#endif /* MBEDTLS_ECP_LIGHT */
|
|
|
|
/* If MBEDTLS_RSA_C is defined but MBEDTLS_ECP_LIGHT isn't,
|
|
* it is ok to leave the PK context initialized but not
|
|
* freed: It is the caller's responsibility to call pk_init()
|
|
* before calling this function, and to call pk_free()
|
|
* when it fails. If MBEDTLS_ECP_LIGHT is defined but MBEDTLS_RSA_C
|
|
* isn't, this leads to mbedtls_pk_free() being called
|
|
* twice, once here and once by the caller, but this is
|
|
* also ok and in line with the mbedtls_pk_free() calls
|
|
* on failed PEM parsing attempts. */
|
|
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
/*
|
|
* Parse a public key
|
|
*/
|
|
int mbedtls_pk_parse_public_key(mbedtls_pk_context *ctx,
|
|
const unsigned char *key, size_t keylen)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p;
|
|
#if defined(MBEDTLS_RSA_C)
|
|
const mbedtls_pk_info_t *pk_info;
|
|
#endif
|
|
#if defined(MBEDTLS_PEM_PARSE_C)
|
|
size_t len;
|
|
mbedtls_pem_context pem;
|
|
#endif
|
|
|
|
if (keylen == 0) {
|
|
return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PEM_PARSE_C)
|
|
mbedtls_pem_init(&pem);
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN RSA PUBLIC KEY-----",
|
|
"-----END RSA PUBLIC KEY-----",
|
|
key, NULL, 0, &len);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
p = pem.buf;
|
|
if ((pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == NULL) {
|
|
mbedtls_pem_free(&pem);
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
}
|
|
|
|
if ((ret = mbedtls_pk_setup(ctx, pk_info)) != 0) {
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = pk_get_rsapubkey(&p, p + pem.buflen, mbedtls_pk_rsa(*ctx))) != 0) {
|
|
mbedtls_pk_free(ctx);
|
|
}
|
|
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
|
|
if (key[keylen - 1] != '\0') {
|
|
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
|
|
} else {
|
|
ret = mbedtls_pem_read_buffer(&pem,
|
|
"-----BEGIN PUBLIC KEY-----",
|
|
"-----END PUBLIC KEY-----",
|
|
key, NULL, 0, &len);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
/*
|
|
* Was PEM encoded
|
|
*/
|
|
p = pem.buf;
|
|
|
|
ret = mbedtls_pk_parse_subpubkey(&p, p + pem.buflen, ctx);
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
} else if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
|
|
mbedtls_pem_free(&pem);
|
|
return ret;
|
|
}
|
|
mbedtls_pem_free(&pem);
|
|
#endif /* MBEDTLS_PEM_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if ((pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == NULL) {
|
|
return MBEDTLS_ERR_PK_UNKNOWN_PK_ALG;
|
|
}
|
|
|
|
if ((ret = mbedtls_pk_setup(ctx, pk_info)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
p = (unsigned char *) key;
|
|
ret = pk_get_rsapubkey(&p, p + keylen, mbedtls_pk_rsa(*ctx));
|
|
if (ret == 0) {
|
|
return ret;
|
|
}
|
|
mbedtls_pk_free(ctx);
|
|
if (ret != (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY,
|
|
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG))) {
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
p = (unsigned char *) key;
|
|
|
|
ret = mbedtls_pk_parse_subpubkey(&p, p + keylen, ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* MBEDTLS_PK_PARSE_C */
|