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mbedtls/library/pk_wrap.c
Gilles Peskine 92fb604139 Fix mbedtls_pk_get_bitlen() for RSA with non-byte-aligned sizes 
Add non-regression tests. Update some test functions to not assume that
byte_length == bit_length / 8.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2024-02-12 11:24:08 +01:00

1561 lines
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/*
* Public Key abstraction layer: wrapper functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "common.h"
#include "mbedtls/platform_util.h"
#if defined(MBEDTLS_PK_C)
#include "pk_wrap.h"
#include "pk_internal.h"
#include "mbedtls/error.h"
#include "mbedtls/psa_util.h"
/* Even if RSA not activated, for the sake of RSA-alt */
#include "mbedtls/rsa.h"
#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa_util_internal.h"
#include "psa/crypto.h"
#include "mbedtls/psa_util.h"
#if defined(MBEDTLS_RSA_C)
#include "pkwrite.h"
#include "rsa_internal.h"
#endif
#if defined(MBEDTLS_PK_CAN_ECDSA_SOME)
#include "mbedtls/asn1write.h"
#include "mbedtls/asn1.h"
#endif
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#include "mbedtls/platform.h"
#include <limits.h>
#include <stdint.h>
#include <string.h>
#if defined(MBEDTLS_RSA_C)
static int rsa_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_RSA ||
type == MBEDTLS_PK_RSASSA_PSS;
}
static size_t rsa_get_bitlen(mbedtls_pk_context *pk)
{
const mbedtls_rsa_context *rsa = (const mbedtls_rsa_context *) pk->pk_ctx;
return mbedtls_rsa_get_bitlen(rsa);
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_verify_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
int key_len;
unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES];
unsigned char *p = buf + sizeof(buf);
psa_algorithm_t psa_alg_md =
PSA_ALG_RSA_PKCS1V15_SIGN(mbedtls_md_psa_alg_from_type(md_alg));
size_t rsa_len = mbedtls_rsa_get_len(rsa);
#if SIZE_MAX > UINT_MAX
if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
#endif
if (sig_len < rsa_len) {
return MBEDTLS_ERR_RSA_VERIFY_FAILED;
}
key_len = mbedtls_rsa_write_pubkey(rsa, buf, &p);
if (key_len <= 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_HASH);
psa_set_key_algorithm(&attributes, psa_alg_md);
psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY);
status = psa_import_key(&attributes,
buf + sizeof(buf) - key_len, key_len,
&key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
status = psa_verify_hash(key_id, psa_alg_md, hash, hash_len,
sig, sig_len);
if (status != PSA_SUCCESS) {
ret = PSA_PK_RSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = 0;
cleanup:
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int rsa_verify_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
size_t rsa_len = mbedtls_rsa_get_len(rsa);
#if SIZE_MAX > UINT_MAX
if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
#endif
if (sig_len < rsa_len) {
return MBEDTLS_ERR_RSA_VERIFY_FAILED;
}
if ((ret = mbedtls_rsa_pkcs1_verify(rsa, md_alg,
(unsigned int) hash_len,
hash, sig)) != 0) {
return ret;
}
/* The buffer contains a valid signature followed by extra data.
* We have a special error code for that so that so that callers can
* use mbedtls_pk_verify() to check "Does the buffer start with a
* valid signature?" and not just "Does the buffer contain a valid
* signature?". */
if (sig_len > rsa_len) {
return MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_pk_psa_rsa_sign_ext(psa_algorithm_t alg,
mbedtls_rsa_context *rsa_ctx,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size,
size_t *sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
int key_len;
unsigned char *buf = NULL;
unsigned char *p;
buf = mbedtls_calloc(1, MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES);
if (buf == NULL) {
return MBEDTLS_ERR_PK_ALLOC_FAILED;
}
p = buf + MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES;
*sig_len = mbedtls_rsa_get_len(rsa_ctx);
if (sig_size < *sig_len) {
mbedtls_free(buf);
return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
}
key_len = mbedtls_rsa_write_key(rsa_ctx, buf, &p);
if (key_len <= 0) {
mbedtls_free(buf);
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_HASH);
psa_set_key_algorithm(&attributes, alg);
psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_KEY_PAIR);
status = psa_import_key(&attributes,
buf + MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES - key_len, key_len,
&key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
status = psa_sign_hash(key_id, alg, hash, hash_len,
sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
ret = PSA_PK_RSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = 0;
cleanup:
mbedtls_free(buf);
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
((void) f_rng);
((void) p_rng);
psa_algorithm_t psa_md_alg;
psa_md_alg = mbedtls_md_psa_alg_from_type(md_alg);
if (psa_md_alg == 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return mbedtls_pk_psa_rsa_sign_ext(PSA_ALG_RSA_PKCS1V15_SIGN(
psa_md_alg),
pk->pk_ctx, hash, hash_len,
sig, sig_size, sig_len);
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int rsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
#if SIZE_MAX > UINT_MAX
if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
#endif
*sig_len = mbedtls_rsa_get_len(rsa);
if (sig_size < *sig_len) {
return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
}
return mbedtls_rsa_pkcs1_sign(rsa, f_rng, p_rng,
md_alg, (unsigned int) hash_len,
hash, sig);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_decrypt_wrap(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
int key_len;
unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES];
unsigned char *p = buf + sizeof(buf);
((void) f_rng);
((void) p_rng);
#if !defined(MBEDTLS_RSA_ALT)
if (rsa->padding != MBEDTLS_RSA_PKCS_V15) {
return MBEDTLS_ERR_RSA_INVALID_PADDING;
}
#endif /* !MBEDTLS_RSA_ALT */
if (ilen != mbedtls_rsa_get_len(rsa)) {
return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
}
key_len = mbedtls_rsa_write_key(rsa, buf, &p);
if (key_len <= 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_KEY_PAIR);
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DECRYPT);
psa_set_key_algorithm(&attributes, PSA_ALG_RSA_PKCS1V15_CRYPT);
status = psa_import_key(&attributes,
buf + sizeof(buf) - key_len, key_len,
&key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
status = psa_asymmetric_decrypt(key_id, PSA_ALG_RSA_PKCS1V15_CRYPT,
input, ilen,
NULL, 0,
output, osize, olen);
if (status != PSA_SUCCESS) {
ret = PSA_PK_RSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = 0;
cleanup:
mbedtls_platform_zeroize(buf, sizeof(buf));
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int rsa_decrypt_wrap(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
if (ilen != mbedtls_rsa_get_len(rsa)) {
return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
}
return mbedtls_rsa_pkcs1_decrypt(rsa, f_rng, p_rng,
olen, input, output, osize);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_encrypt_wrap(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
int key_len;
unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES];
unsigned char *p = buf + sizeof(buf);
((void) f_rng);
((void) p_rng);
#if !defined(MBEDTLS_RSA_ALT)
if (rsa->padding != MBEDTLS_RSA_PKCS_V15) {
return MBEDTLS_ERR_RSA_INVALID_PADDING;
}
#endif
if (mbedtls_rsa_get_len(rsa) > osize) {
return MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE;
}
key_len = mbedtls_rsa_write_pubkey(rsa, buf, &p);
if (key_len <= 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_ENCRYPT);
psa_set_key_algorithm(&attributes, PSA_ALG_RSA_PKCS1V15_CRYPT);
psa_set_key_type(&attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY);
status = psa_import_key(&attributes,
buf + sizeof(buf) - key_len, key_len,
&key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
status = psa_asymmetric_encrypt(key_id, PSA_ALG_RSA_PKCS1V15_CRYPT,
input, ilen,
NULL, 0,
output, osize, olen);
if (status != PSA_SUCCESS) {
ret = PSA_PK_RSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = 0;
cleanup:
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int rsa_encrypt_wrap(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
*olen = mbedtls_rsa_get_len(rsa);
if (*olen > osize) {
return MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE;
}
return mbedtls_rsa_pkcs1_encrypt(rsa, f_rng, p_rng,
ilen, input, output);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
static int rsa_check_pair_wrap(mbedtls_pk_context *pub, mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
(void) f_rng;
(void) p_rng;
return mbedtls_rsa_check_pub_priv((const mbedtls_rsa_context *) pub->pk_ctx,
(const mbedtls_rsa_context *) prv->pk_ctx);
}
static void *rsa_alloc_wrap(void)
{
void *ctx = mbedtls_calloc(1, sizeof(mbedtls_rsa_context));
if (ctx != NULL) {
mbedtls_rsa_init((mbedtls_rsa_context *) ctx);
}
return ctx;
}
static void rsa_free_wrap(void *ctx)
{
mbedtls_rsa_free((mbedtls_rsa_context *) ctx);
mbedtls_free(ctx);
}
static void rsa_debug(mbedtls_pk_context *pk, mbedtls_pk_debug_item *items)
{
#if defined(MBEDTLS_RSA_ALT)
/* Not supported */
(void) pk;
(void) items;
#else
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.N";
items->value = &(rsa->N);
items++;
items->type = MBEDTLS_PK_DEBUG_MPI;
items->name = "rsa.E";
items->value = &(rsa->E);
#endif
}
const mbedtls_pk_info_t mbedtls_rsa_info = {
.type = MBEDTLS_PK_RSA,
.name = "RSA",
.get_bitlen = rsa_get_bitlen,
.can_do = rsa_can_do,
.verify_func = rsa_verify_wrap,
.sign_func = rsa_sign_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = NULL,
.sign_rs_func = NULL,
.rs_alloc_func = NULL,
.rs_free_func = NULL,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = rsa_decrypt_wrap,
.encrypt_func = rsa_encrypt_wrap,
.check_pair_func = rsa_check_pair_wrap,
.ctx_alloc_func = rsa_alloc_wrap,
.ctx_free_func = rsa_free_wrap,
.debug_func = rsa_debug,
};
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
/*
* Generic EC key
*/
static int eckey_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH ||
type == MBEDTLS_PK_ECDSA;
}
static size_t eckey_get_bitlen(mbedtls_pk_context *pk)
{
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
return pk->ec_bits;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *ecp = (mbedtls_ecp_keypair *) pk->pk_ctx;
return ecp->grp.pbits;
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
}
#if defined(MBEDTLS_PK_CAN_ECDSA_VERIFY)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* Common helper for ECDSA verify using PSA functions. */
static int ecdsa_verify_psa(unsigned char *key, size_t key_len,
psa_ecc_family_t curve, size_t curve_bits,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_algorithm_t psa_sig_md = PSA_ALG_ECDSA_ANY;
size_t signature_len = PSA_ECDSA_SIGNATURE_SIZE(curve_bits);
size_t converted_sig_len;
unsigned char extracted_sig[PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE];
unsigned char *p;
psa_status_t status;
if (curve == 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_type(&attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY(curve));
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_HASH);
psa_set_key_algorithm(&attributes, psa_sig_md);
status = psa_import_key(&attributes, key, key_len, &key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
if (signature_len > sizeof(extracted_sig)) {
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
goto cleanup;
}
p = (unsigned char *) sig;
ret = mbedtls_ecdsa_der_to_raw(curve_bits, p, sig_len, extracted_sig,
sizeof(extracted_sig), &converted_sig_len);
if (ret != 0) {
goto cleanup;
}
if (converted_sig_len != signature_len) {
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
goto cleanup;
}
status = psa_verify_hash(key_id, psa_sig_md, hash, hash_len,
extracted_sig, signature_len);
if (status != PSA_SUCCESS) {
ret = PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = 0;
cleanup:
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
static int ecdsa_opaque_verify_wrap(mbedtls_pk_context *pk,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
(void) md_alg;
unsigned char key[MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN];
size_t key_len;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
psa_ecc_family_t curve;
size_t curve_bits;
psa_status_t status;
status = psa_get_key_attributes(pk->priv_id, &key_attr);
if (status != PSA_SUCCESS) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
curve = PSA_KEY_TYPE_ECC_GET_FAMILY(psa_get_key_type(&key_attr));
curve_bits = psa_get_key_bits(&key_attr);
psa_reset_key_attributes(&key_attr);
status = psa_export_public_key(pk->priv_id, key, sizeof(key), &key_len);
if (status != PSA_SUCCESS) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
return ecdsa_verify_psa(key, key_len, curve, curve_bits,
hash, hash_len, sig, sig_len);
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
static int ecdsa_verify_wrap(mbedtls_pk_context *pk,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
(void) md_alg;
psa_ecc_family_t curve = pk->ec_family;
size_t curve_bits = pk->ec_bits;
return ecdsa_verify_psa(pk->pub_raw, pk->pub_raw_len, curve, curve_bits,
hash, hash_len, sig, sig_len);
}
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int ecdsa_verify_wrap(mbedtls_pk_context *pk,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
(void) md_alg;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ecp_keypair *ctx = pk->pk_ctx;
unsigned char key[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t key_len;
size_t curve_bits;
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa(ctx->grp.id, &curve_bits);
ret = mbedtls_ecp_point_write_binary(&ctx->grp, &ctx->Q,
MBEDTLS_ECP_PF_UNCOMPRESSED,
&key_len, key, sizeof(key));
if (ret != 0) {
return ret;
}
return ecdsa_verify_psa(key, key_len, curve, curve_bits,
hash, hash_len, sig, sig_len);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int ecdsa_verify_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
((void) md_alg);
ret = mbedtls_ecdsa_read_signature((mbedtls_ecdsa_context *) pk->pk_ctx,
hash, hash_len, sig, sig_len);
if (ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH) {
return MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;
}
return ret;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* Common helper for ECDSA sign using PSA functions.
* Instead of extracting key's properties in order to check which kind of ECDSA
* signature it supports, we try both deterministic and non-deterministic.
*/
static int ecdsa_sign_psa(mbedtls_svc_key_id_t key_id, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_status_t status;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
size_t key_bits = 0;
status = psa_get_key_attributes(key_id, &key_attr);
if (status != PSA_SUCCESS) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
key_bits = psa_get_key_bits(&key_attr);
psa_reset_key_attributes(&key_attr);
status = psa_sign_hash(key_id,
PSA_ALG_DETERMINISTIC_ECDSA(mbedtls_md_psa_alg_from_type(md_alg)),
hash, hash_len, sig, sig_size, sig_len);
if (status == PSA_SUCCESS) {
goto done;
} else if (status != PSA_ERROR_NOT_PERMITTED) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
status = psa_sign_hash(key_id,
PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg)),
hash, hash_len, sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
done:
ret = mbedtls_ecdsa_raw_to_der(key_bits, sig, *sig_len, sig, sig_size, sig_len);
return ret;
}
static int ecdsa_opaque_sign_wrap(mbedtls_pk_context *pk,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size,
size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
((void) f_rng);
((void) p_rng);
return ecdsa_sign_psa(pk->priv_id, md_alg, hash, hash_len, sig, sig_size,
sig_len);
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
/* When PK_USE_PSA_EC_DATA is defined opaque and non-opaque keys end up
* using the same function. */
#define ecdsa_sign_wrap ecdsa_opaque_sign_wrap
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
mbedtls_ecp_keypair *ctx = pk->pk_ctx;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
unsigned char buf[MBEDTLS_PSA_MAX_EC_KEY_PAIR_LENGTH];
size_t curve_bits;
psa_ecc_family_t curve =
mbedtls_ecc_group_to_psa(ctx->grp.id, &curve_bits);
size_t key_len = PSA_BITS_TO_BYTES(curve_bits);
psa_algorithm_t psa_hash = mbedtls_md_psa_alg_from_type(md_alg);
psa_algorithm_t psa_sig_md = MBEDTLS_PK_PSA_ALG_ECDSA_MAYBE_DET(psa_hash);
((void) f_rng);
((void) p_rng);
if (curve == 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if (key_len > sizeof(buf)) {
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
ret = mbedtls_mpi_write_binary(&ctx->d, buf, key_len);
if (ret != 0) {
goto cleanup;
}
psa_set_key_type(&attributes, PSA_KEY_TYPE_ECC_KEY_PAIR(curve));
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_HASH);
psa_set_key_algorithm(&attributes, psa_sig_md);
status = psa_import_key(&attributes, buf, key_len, &key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = ecdsa_sign_psa(key_id, md_alg, hash, hash_len, sig, sig_size, sig_len);
cleanup:
mbedtls_platform_zeroize(buf, sizeof(buf));
status = psa_destroy_key(key_id);
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
return mbedtls_ecdsa_write_signature((mbedtls_ecdsa_context *) pk->pk_ctx,
md_alg, hash, hash_len,
sig, sig_size, sig_len,
f_rng, p_rng);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* Forward declarations */
static int ecdsa_verify_rs_wrap(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx);
static int ecdsa_sign_rs_wrap(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
void *rs_ctx);
/*
* Restart context for ECDSA operations with ECKEY context
*
* We need to store an actual ECDSA context, as we need to pass the same to
* the underlying ecdsa function, so we can't create it on the fly every time.
*/
typedef struct {
mbedtls_ecdsa_restart_ctx ecdsa_rs;
mbedtls_ecdsa_context ecdsa_ctx;
} eckey_restart_ctx;
static void *eckey_rs_alloc(void)
{
eckey_restart_ctx *rs_ctx;
void *ctx = mbedtls_calloc(1, sizeof(eckey_restart_ctx));
if (ctx != NULL) {
rs_ctx = ctx;
mbedtls_ecdsa_restart_init(&rs_ctx->ecdsa_rs);
mbedtls_ecdsa_init(&rs_ctx->ecdsa_ctx);
}
return ctx;
}
static void eckey_rs_free(void *ctx)
{
eckey_restart_ctx *rs_ctx;
if (ctx == NULL) {
return;
}
rs_ctx = ctx;
mbedtls_ecdsa_restart_free(&rs_ctx->ecdsa_rs);
mbedtls_ecdsa_free(&rs_ctx->ecdsa_ctx);
mbedtls_free(ctx);
}
static int eckey_verify_rs_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
eckey_restart_ctx *rs = rs_ctx;
/* Should never happen */
if (rs == NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
/* set up our own sub-context if needed (that is, on first run) */
if (rs->ecdsa_ctx.grp.pbits == 0) {
MBEDTLS_MPI_CHK(mbedtls_ecdsa_from_keypair(&rs->ecdsa_ctx, pk->pk_ctx));
}
MBEDTLS_MPI_CHK(ecdsa_verify_rs_wrap(pk,
md_alg, hash, hash_len,
sig, sig_len, &rs->ecdsa_rs));
cleanup:
return ret;
}
static int eckey_sign_rs_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
void *rs_ctx)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
eckey_restart_ctx *rs = rs_ctx;
/* Should never happen */
if (rs == NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
/* set up our own sub-context if needed (that is, on first run) */
if (rs->ecdsa_ctx.grp.pbits == 0) {
MBEDTLS_MPI_CHK(mbedtls_ecdsa_from_keypair(&rs->ecdsa_ctx, pk->pk_ctx));
}
MBEDTLS_MPI_CHK(ecdsa_sign_rs_wrap(pk, md_alg,
hash, hash_len, sig, sig_size, sig_len,
f_rng, p_rng, &rs->ecdsa_rs));
cleanup:
return ret;
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
static int eckey_check_pair_psa(mbedtls_pk_context *pub, mbedtls_pk_context *prv)
{
psa_status_t status;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
uint8_t prv_key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t prv_key_len;
mbedtls_svc_key_id_t key_id = prv->priv_id;
status = psa_export_public_key(key_id, prv_key_buf, sizeof(prv_key_buf),
&prv_key_len);
ret = PSA_PK_TO_MBEDTLS_ERR(status);
if (ret != 0) {
return ret;
}
if (memcmp(prv_key_buf, pub->pub_raw, pub->pub_raw_len) != 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return 0;
}
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int eckey_check_pair_psa(mbedtls_pk_context *pub, mbedtls_pk_context *prv)
{
psa_status_t status;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
uint8_t prv_key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t prv_key_len;
psa_status_t destruction_status;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
uint8_t pub_key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t pub_key_len;
size_t curve_bits;
const psa_ecc_family_t curve =
mbedtls_ecc_group_to_psa(mbedtls_pk_ec_ro(*prv)->grp.id, &curve_bits);
const size_t curve_bytes = PSA_BITS_TO_BYTES(curve_bits);
if (curve == 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
psa_set_key_type(&key_attr, PSA_KEY_TYPE_ECC_KEY_PAIR(curve));
psa_set_key_usage_flags(&key_attr, PSA_KEY_USAGE_EXPORT);
ret = mbedtls_mpi_write_binary(&mbedtls_pk_ec_ro(*prv)->d,
prv_key_buf, curve_bytes);
if (ret != 0) {
mbedtls_platform_zeroize(prv_key_buf, sizeof(prv_key_buf));
return ret;
}
status = psa_import_key(&key_attr, prv_key_buf, curve_bytes, &key_id);
mbedtls_platform_zeroize(prv_key_buf, sizeof(prv_key_buf));
ret = PSA_PK_TO_MBEDTLS_ERR(status);
if (ret != 0) {
return ret;
}
// From now on prv_key_buf is used to store the public key of prv.
status = psa_export_public_key(key_id, prv_key_buf, sizeof(prv_key_buf),
&prv_key_len);
ret = PSA_PK_TO_MBEDTLS_ERR(status);
destruction_status = psa_destroy_key(key_id);
if (ret != 0) {
return ret;
} else if (destruction_status != PSA_SUCCESS) {
return PSA_PK_TO_MBEDTLS_ERR(destruction_status);
}
ret = mbedtls_ecp_point_write_binary(&mbedtls_pk_ec_rw(*pub)->grp,
&mbedtls_pk_ec_rw(*pub)->Q,
MBEDTLS_ECP_PF_UNCOMPRESSED,
&pub_key_len, pub_key_buf,
sizeof(pub_key_buf));
if (ret != 0) {
return ret;
}
if (memcmp(prv_key_buf, pub_key_buf, curve_bytes) != 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return 0;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int eckey_check_pair_wrap(mbedtls_pk_context *pub, mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
(void) f_rng;
(void) p_rng;
return eckey_check_pair_psa(pub, prv);
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int eckey_check_pair_wrap(mbedtls_pk_context *pub, mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
return mbedtls_ecp_check_pub_priv((const mbedtls_ecp_keypair *) pub->pk_ctx,
(const mbedtls_ecp_keypair *) prv->pk_ctx,
f_rng, p_rng);
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
/* When PK_USE_PSA_EC_DATA is defined opaque and non-opaque keys end up
* using the same function. */
#define ecdsa_opaque_check_pair_wrap eckey_check_pair_wrap
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int ecdsa_opaque_check_pair_wrap(mbedtls_pk_context *pub,
mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
psa_status_t status;
uint8_t exp_pub_key[MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN];
size_t exp_pub_key_len = 0;
uint8_t pub_key[MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN];
size_t pub_key_len = 0;
int ret;
(void) f_rng;
(void) p_rng;
status = psa_export_public_key(prv->priv_id, exp_pub_key, sizeof(exp_pub_key),
&exp_pub_key_len);
if (status != PSA_SUCCESS) {
ret = psa_pk_status_to_mbedtls(status);
return ret;
}
ret = mbedtls_ecp_point_write_binary(&(mbedtls_pk_ec_ro(*pub)->grp),
&(mbedtls_pk_ec_ro(*pub)->Q),
MBEDTLS_ECP_PF_UNCOMPRESSED,
&pub_key_len, pub_key, sizeof(pub_key));
if (ret != 0) {
return ret;
}
if ((exp_pub_key_len != pub_key_len) ||
memcmp(exp_pub_key, pub_key, exp_pub_key_len)) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return 0;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
static void *eckey_alloc_wrap(void)
{
void *ctx = mbedtls_calloc(1, sizeof(mbedtls_ecp_keypair));
if (ctx != NULL) {
mbedtls_ecp_keypair_init(ctx);
}
return ctx;
}
static void eckey_free_wrap(void *ctx)
{
mbedtls_ecp_keypair_free((mbedtls_ecp_keypair *) ctx);
mbedtls_free(ctx);
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
static void eckey_debug(mbedtls_pk_context *pk, mbedtls_pk_debug_item *items)
{
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
items->type = MBEDTLS_PK_DEBUG_PSA_EC;
items->name = "eckey.Q";
items->value = pk;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *ecp = (mbedtls_ecp_keypair *) pk->pk_ctx;
items->type = MBEDTLS_PK_DEBUG_ECP;
items->name = "eckey.Q";
items->value = &(ecp->Q);
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
}
const mbedtls_pk_info_t mbedtls_eckey_info = {
.type = MBEDTLS_PK_ECKEY,
.name = "EC",
.get_bitlen = eckey_get_bitlen,
.can_do = eckey_can_do,
#if defined(MBEDTLS_PK_CAN_ECDSA_VERIFY)
.verify_func = ecdsa_verify_wrap, /* Compatible key structures */
#else /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
.verify_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
.sign_func = ecdsa_sign_wrap, /* Compatible key structures */
#else /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
.sign_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = eckey_verify_rs_wrap,
.sign_rs_func = eckey_sign_rs_wrap,
.rs_alloc_func = eckey_rs_alloc,
.rs_free_func = eckey_rs_free,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = NULL,
.encrypt_func = NULL,
.check_pair_func = eckey_check_pair_wrap,
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
.ctx_alloc_func = NULL,
.ctx_free_func = NULL,
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
.ctx_alloc_func = eckey_alloc_wrap,
.ctx_free_func = eckey_free_wrap,
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
.debug_func = eckey_debug,
};
/*
* EC key restricted to ECDH
*/
static int eckeydh_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECKEY_DH;
}
const mbedtls_pk_info_t mbedtls_eckeydh_info = {
.type = MBEDTLS_PK_ECKEY_DH,
.name = "EC_DH",
.get_bitlen = eckey_get_bitlen, /* Same underlying key structure */
.can_do = eckeydh_can_do,
.verify_func = NULL,
.sign_func = NULL,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = NULL,
.sign_rs_func = NULL,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = NULL,
.encrypt_func = NULL,
.check_pair_func = eckey_check_pair_wrap,
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
.ctx_alloc_func = NULL,
.ctx_free_func = NULL,
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
.ctx_alloc_func = eckey_alloc_wrap, /* Same underlying key structure */
.ctx_free_func = eckey_free_wrap, /* Same underlying key structure */
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
.debug_func = eckey_debug, /* Same underlying key structure */
};
#if defined(MBEDTLS_PK_CAN_ECDSA_SOME)
static int ecdsa_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_ECDSA;
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
static int ecdsa_verify_rs_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
void *rs_ctx)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
((void) md_alg);
ret = mbedtls_ecdsa_read_signature_restartable(
(mbedtls_ecdsa_context *) pk->pk_ctx,
hash, hash_len, sig, sig_len,
(mbedtls_ecdsa_restart_ctx *) rs_ctx);
if (ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH) {
return MBEDTLS_ERR_PK_SIG_LEN_MISMATCH;
}
return ret;
}
static int ecdsa_sign_rs_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
void *rs_ctx)
{
return mbedtls_ecdsa_write_signature_restartable(
(mbedtls_ecdsa_context *) pk->pk_ctx,
md_alg, hash, hash_len, sig, sig_size, sig_len, f_rng, p_rng,
(mbedtls_ecdsa_restart_ctx *) rs_ctx);
}
static void *ecdsa_rs_alloc(void)
{
void *ctx = mbedtls_calloc(1, sizeof(mbedtls_ecdsa_restart_ctx));
if (ctx != NULL) {
mbedtls_ecdsa_restart_init(ctx);
}
return ctx;
}
static void ecdsa_rs_free(void *ctx)
{
mbedtls_ecdsa_restart_free(ctx);
mbedtls_free(ctx);
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
const mbedtls_pk_info_t mbedtls_ecdsa_info = {
.type = MBEDTLS_PK_ECDSA,
.name = "ECDSA",
.get_bitlen = eckey_get_bitlen, /* Compatible key structures */
.can_do = ecdsa_can_do,
#if defined(MBEDTLS_PK_CAN_ECDSA_VERIFY)
.verify_func = ecdsa_verify_wrap, /* Compatible key structures */
#else /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
.verify_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
.sign_func = ecdsa_sign_wrap, /* Compatible key structures */
#else /* MBEDTLS_PK_CAN_ECDSA_SIGN */
.sign_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = ecdsa_verify_rs_wrap,
.sign_rs_func = ecdsa_sign_rs_wrap,
.rs_alloc_func = ecdsa_rs_alloc,
.rs_free_func = ecdsa_rs_free,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = NULL,
.encrypt_func = NULL,
.check_pair_func = eckey_check_pair_wrap, /* Compatible key structures */
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
.ctx_alloc_func = NULL,
.ctx_free_func = NULL,
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
.ctx_alloc_func = eckey_alloc_wrap, /* Compatible key structures */
.ctx_free_func = eckey_free_wrap, /* Compatible key structures */
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
.debug_func = eckey_debug, /* Compatible key structures */
};
#endif /* MBEDTLS_PK_CAN_ECDSA_SOME */
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/*
* Support for alternative RSA-private implementations
*/
static int rsa_alt_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_RSA;
}
static size_t rsa_alt_get_bitlen(mbedtls_pk_context *pk)
{
const mbedtls_rsa_alt_context *rsa_alt = pk->pk_ctx;
return 8 * rsa_alt->key_len_func(rsa_alt->key);
}
static int rsa_alt_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_alt_context *rsa_alt = pk->pk_ctx;
#if SIZE_MAX > UINT_MAX
if (UINT_MAX < hash_len) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
#endif
*sig_len = rsa_alt->key_len_func(rsa_alt->key);
if (*sig_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if (*sig_len > sig_size) {
return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
}
return rsa_alt->sign_func(rsa_alt->key, f_rng, p_rng,
md_alg, (unsigned int) hash_len, hash, sig);
}
static int rsa_alt_decrypt_wrap(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
mbedtls_rsa_alt_context *rsa_alt = pk->pk_ctx;
((void) f_rng);
((void) p_rng);
if (ilen != rsa_alt->key_len_func(rsa_alt->key)) {
return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
}
return rsa_alt->decrypt_func(rsa_alt->key,
olen, input, output, osize);
}
#if defined(MBEDTLS_RSA_C)
static int rsa_alt_check_pair(mbedtls_pk_context *pub, mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
unsigned char hash[32];
size_t sig_len = 0;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (rsa_alt_get_bitlen(prv) != rsa_get_bitlen(pub)) {
return MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
}
memset(hash, 0x2a, sizeof(hash));
if ((ret = rsa_alt_sign_wrap(prv, MBEDTLS_MD_NONE,
hash, sizeof(hash),
sig, sizeof(sig), &sig_len,
f_rng, p_rng)) != 0) {
return ret;
}
if (rsa_verify_wrap(pub, MBEDTLS_MD_NONE,
hash, sizeof(hash), sig, sig_len) != 0) {
return MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
}
return 0;
}
#endif /* MBEDTLS_RSA_C */
static void *rsa_alt_alloc_wrap(void)
{
void *ctx = mbedtls_calloc(1, sizeof(mbedtls_rsa_alt_context));
if (ctx != NULL) {
memset(ctx, 0, sizeof(mbedtls_rsa_alt_context));
}
return ctx;
}
static void rsa_alt_free_wrap(void *ctx)
{
mbedtls_zeroize_and_free(ctx, sizeof(mbedtls_rsa_alt_context));
}
const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
.type = MBEDTLS_PK_RSA_ALT,
.name = "RSA-alt",
.get_bitlen = rsa_alt_get_bitlen,
.can_do = rsa_alt_can_do,
.verify_func = NULL,
.sign_func = rsa_alt_sign_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = NULL,
.sign_rs_func = NULL,
.rs_alloc_func = NULL,
.rs_free_func = NULL,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = rsa_alt_decrypt_wrap,
.encrypt_func = NULL,
#if defined(MBEDTLS_RSA_C)
.check_pair_func = rsa_alt_check_pair,
#else
.check_pair_func = NULL,
#endif
.ctx_alloc_func = rsa_alt_alloc_wrap,
.ctx_free_func = rsa_alt_free_wrap,
.debug_func = NULL,
};
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static size_t opaque_get_bitlen(mbedtls_pk_context *pk)
{
size_t bits;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
if (PSA_SUCCESS != psa_get_key_attributes(pk->priv_id, &attributes)) {
return 0;
}
bits = psa_get_key_bits(&attributes);
psa_reset_key_attributes(&attributes);
return bits;
}
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
static int ecdsa_opaque_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_ECKEY ||
type == MBEDTLS_PK_ECDSA;
}
const mbedtls_pk_info_t mbedtls_ecdsa_opaque_info = {
.type = MBEDTLS_PK_OPAQUE,
.name = "Opaque",
.get_bitlen = opaque_get_bitlen,
.can_do = ecdsa_opaque_can_do,
#if defined(MBEDTLS_PK_CAN_ECDSA_VERIFY)
.verify_func = ecdsa_opaque_verify_wrap,
#else /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
.verify_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_VERIFY */
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
.sign_func = ecdsa_opaque_sign_wrap,
#else /* MBEDTLS_PK_CAN_ECDSA_SIGN */
.sign_func = NULL,
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = NULL,
.sign_rs_func = NULL,
.rs_alloc_func = NULL,
.rs_free_func = NULL,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
.decrypt_func = NULL,
.encrypt_func = NULL,
.check_pair_func = ecdsa_opaque_check_pair_wrap,
.ctx_alloc_func = NULL,
.ctx_free_func = NULL,
.debug_func = NULL,
};
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
static int rsa_opaque_can_do(mbedtls_pk_type_t type)
{
return type == MBEDTLS_PK_RSA ||
type == MBEDTLS_PK_RSASSA_PSS;
}
#if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC)
static int rsa_opaque_decrypt(mbedtls_pk_context *pk,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
psa_status_t status;
/* PSA has its own RNG */
(void) f_rng;
(void) p_rng;
status = psa_asymmetric_decrypt(pk->priv_id, PSA_ALG_RSA_PKCS1V15_CRYPT,
input, ilen,
NULL, 0,
output, osize, olen);
if (status != PSA_SUCCESS) {
return PSA_PK_RSA_TO_MBEDTLS_ERR(status);
}
return 0;
}
#endif /* PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC */
static int rsa_opaque_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
#if defined(MBEDTLS_RSA_C)
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t alg;
psa_key_type_t type;
psa_status_t status;
/* PSA has its own RNG */
(void) f_rng;
(void) p_rng;
status = psa_get_key_attributes(pk->priv_id, &attributes);
if (status != PSA_SUCCESS) {
return PSA_PK_TO_MBEDTLS_ERR(status);
}
type = psa_get_key_type(&attributes);
psa_reset_key_attributes(&attributes);
if (PSA_KEY_TYPE_IS_RSA(type)) {
alg = PSA_ALG_RSA_PKCS1V15_SIGN(mbedtls_md_psa_alg_from_type(md_alg));
} else {
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
}
/* make the signature */
status = psa_sign_hash(pk->priv_id, alg, hash, hash_len,
sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
if (PSA_KEY_TYPE_IS_RSA(type)) {
return PSA_PK_RSA_TO_MBEDTLS_ERR(status);
} else {
return PSA_PK_TO_MBEDTLS_ERR(status);
}
}
return 0;
#else /* !MBEDTLS_RSA_C */
((void) pk);
((void) md_alg);
((void) hash);
((void) hash_len);
((void) sig);
((void) sig_size);
((void) sig_len);
((void) f_rng);
((void) p_rng);
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
#endif /* !MBEDTLS_RSA_C */
}
const mbedtls_pk_info_t mbedtls_rsa_opaque_info = {
.type = MBEDTLS_PK_OPAQUE,
.name = "Opaque",
.get_bitlen = opaque_get_bitlen,
.can_do = rsa_opaque_can_do,
.verify_func = NULL,
.sign_func = rsa_opaque_sign_wrap,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
.verify_rs_func = NULL,
.sign_rs_func = NULL,
.rs_alloc_func = NULL,
.rs_free_func = NULL,
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
#if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC)
.decrypt_func = rsa_opaque_decrypt,
#else /* PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC */
.decrypt_func = NULL,
#endif /* PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC */
.encrypt_func = NULL,
.check_pair_func = NULL,
.ctx_alloc_func = NULL,
.ctx_free_func = NULL,
.debug_func = NULL,
};
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_PK_C */
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