429 lines
13 KiB
C
429 lines
13 KiB
C
/*
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* Key writing application
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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 "mbedtls/build_info.h"
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_PK_WRITE_C) && \
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defined(MBEDTLS_FS_IO) && \
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defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/error.h"
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#include "mbedtls/pk.h"
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#include "mbedtls/error.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#include <string.h>
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#endif
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#if defined(MBEDTLS_PEM_WRITE_C)
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#define USAGE_OUT \
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" output_file=%%s default: keyfile.pem\n" \
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" output_format=pem|der default: pem\n"
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#else
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#define USAGE_OUT \
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" output_file=%%s default: keyfile.der\n" \
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" output_format=der default: der\n"
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#endif
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#if defined(MBEDTLS_PEM_WRITE_C)
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#define DFL_OUTPUT_FILENAME "keyfile.pem"
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#define DFL_OUTPUT_FORMAT OUTPUT_FORMAT_PEM
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#else
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#define DFL_OUTPUT_FILENAME "keyfile.der"
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#define DFL_OUTPUT_FORMAT OUTPUT_FORMAT_DER
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#endif
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#define DFL_MODE MODE_NONE
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#define DFL_FILENAME "keyfile.key"
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#define DFL_DEBUG_LEVEL 0
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#define DFL_OUTPUT_MODE OUTPUT_MODE_NONE
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#define MODE_NONE 0
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#define MODE_PRIVATE 1
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#define MODE_PUBLIC 2
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#define OUTPUT_MODE_NONE 0
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#define OUTPUT_MODE_PRIVATE 1
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#define OUTPUT_MODE_PUBLIC 2
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#define OUTPUT_FORMAT_PEM 0
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#define OUTPUT_FORMAT_DER 1
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#define USAGE \
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"\n usage: key_app_writer param=<>...\n" \
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"\n acceptable parameters:\n" \
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" mode=private|public default: none\n" \
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" filename=%%s default: keyfile.key\n" \
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" output_mode=private|public default: none\n" \
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USAGE_OUT \
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"\n"
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#if !defined(MBEDTLS_PK_PARSE_C) || \
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!defined(MBEDTLS_PK_WRITE_C) || \
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!defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_CTR_DRBG_C)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_PK_PARSE_C and/or MBEDTLS_PK_WRITE_C and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
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"MBEDTLS_FS_IO not defined.\n");
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mbedtls_exit(0);
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}
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#else
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/*
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* global options
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*/
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struct options {
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int mode; /* the mode to run the application in */
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const char *filename; /* filename of the key file */
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int output_mode; /* the output mode to use */
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const char *output_file; /* where to store the constructed key file */
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int output_format; /* the output format to use */
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} opt;
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static int write_public_key(mbedtls_pk_context *key, const char *output_file)
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{
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int ret;
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FILE *f;
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unsigned char output_buf[16000];
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unsigned char *c = output_buf;
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size_t len = 0;
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memset(output_buf, 0, 16000);
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#if defined(MBEDTLS_PEM_WRITE_C)
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if (opt.output_format == OUTPUT_FORMAT_PEM) {
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if ((ret = mbedtls_pk_write_pubkey_pem(key, output_buf, 16000)) != 0) {
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return ret;
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}
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len = strlen((char *) output_buf);
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} else
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#endif
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{
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if ((ret = mbedtls_pk_write_pubkey_der(key, output_buf, 16000)) < 0) {
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return ret;
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}
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len = ret;
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c = output_buf + sizeof(output_buf) - len;
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}
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if ((f = fopen(output_file, "w")) == NULL) {
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return -1;
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}
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if (fwrite(c, 1, len, f) != len) {
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fclose(f);
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return -1;
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}
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fclose(f);
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return 0;
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}
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static int write_private_key(mbedtls_pk_context *key, const char *output_file)
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{
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int ret;
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FILE *f;
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unsigned char output_buf[16000];
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unsigned char *c = output_buf;
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size_t len = 0;
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memset(output_buf, 0, 16000);
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#if defined(MBEDTLS_PEM_WRITE_C)
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if (opt.output_format == OUTPUT_FORMAT_PEM) {
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if ((ret = mbedtls_pk_write_key_pem(key, output_buf, 16000)) != 0) {
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return ret;
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}
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len = strlen((char *) output_buf);
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} else
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#endif
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{
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if ((ret = mbedtls_pk_write_key_der(key, output_buf, 16000)) < 0) {
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return ret;
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}
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len = ret;
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c = output_buf + sizeof(output_buf) - len;
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}
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if ((f = fopen(output_file, "w")) == NULL) {
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return -1;
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}
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if (fwrite(c, 1, len, f) != len) {
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fclose(f);
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return -1;
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}
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fclose(f);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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#if defined(MBEDTLS_ERROR_C)
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char buf[200];
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#endif
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int i;
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char *p, *q;
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const char *pers = "pkey/key_app";
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_pk_context key;
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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/*
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* Set to sane values
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*/
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mbedtls_entropy_init(&entropy);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_pk_init(&key);
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#if defined(MBEDTLS_ERROR_C)
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memset(buf, 0, sizeof(buf));
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#endif
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mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
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mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP);
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mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP);
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if (argc < 2) {
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usage:
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mbedtls_printf(USAGE);
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goto exit;
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}
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opt.mode = DFL_MODE;
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opt.filename = DFL_FILENAME;
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opt.output_mode = DFL_OUTPUT_MODE;
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opt.output_file = DFL_OUTPUT_FILENAME;
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opt.output_format = DFL_OUTPUT_FORMAT;
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for (i = 1; i < argc; i++) {
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p = argv[i];
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if ((q = strchr(p, '=')) == NULL) {
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goto usage;
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}
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*q++ = '\0';
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if (strcmp(p, "mode") == 0) {
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if (strcmp(q, "private") == 0) {
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opt.mode = MODE_PRIVATE;
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} else if (strcmp(q, "public") == 0) {
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opt.mode = MODE_PUBLIC;
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} else {
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goto usage;
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}
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} else if (strcmp(p, "output_mode") == 0) {
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if (strcmp(q, "private") == 0) {
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opt.output_mode = OUTPUT_MODE_PRIVATE;
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} else if (strcmp(q, "public") == 0) {
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opt.output_mode = OUTPUT_MODE_PUBLIC;
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} else {
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goto usage;
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}
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} else if (strcmp(p, "output_format") == 0) {
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#if defined(MBEDTLS_PEM_WRITE_C)
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if (strcmp(q, "pem") == 0) {
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opt.output_format = OUTPUT_FORMAT_PEM;
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} else
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#endif
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if (strcmp(q, "der") == 0) {
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opt.output_format = OUTPUT_FORMAT_DER;
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} else {
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goto usage;
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}
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} else if (strcmp(p, "filename") == 0) {
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opt.filename = q;
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} else if (strcmp(p, "output_file") == 0) {
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opt.output_file = q;
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} else {
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goto usage;
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}
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}
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if (opt.mode == MODE_NONE && opt.output_mode != OUTPUT_MODE_NONE) {
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mbedtls_printf("\nCannot output a key without reading one.\n");
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goto exit;
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}
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if (opt.mode == MODE_PUBLIC && opt.output_mode == OUTPUT_MODE_PRIVATE) {
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mbedtls_printf("\nCannot output a private key from a public key.\n");
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goto exit;
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}
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if (opt.mode == MODE_PRIVATE) {
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/*
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* 1.1. Load the key
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*/
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mbedtls_printf("\n . Loading the private key ...");
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fflush(stdout);
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if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen(pers))) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
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(unsigned int) -ret);
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goto exit;
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}
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ret = mbedtls_pk_parse_keyfile(&key, opt.filename, NULL,
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mbedtls_ctr_drbg_random, &ctr_drbg);
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x",
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(unsigned int) -ret);
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goto exit;
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}
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mbedtls_printf(" ok\n");
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/*
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* 1.2 Print the key
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*/
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mbedtls_printf(" . Key information ...\n");
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#if defined(MBEDTLS_RSA_C)
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if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_RSA) {
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa(key);
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if ((ret = mbedtls_rsa_export(rsa, &N, &P, &Q, &D, &E)) != 0 ||
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(ret = mbedtls_rsa_export_crt(rsa, &DP, &DQ, &QP)) != 0) {
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mbedtls_printf(" failed\n ! could not export RSA parameters\n\n");
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goto exit;
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}
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mbedtls_mpi_write_file("N: ", &N, 16, NULL);
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mbedtls_mpi_write_file("E: ", &E, 16, NULL);
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mbedtls_mpi_write_file("D: ", &D, 16, NULL);
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mbedtls_mpi_write_file("P: ", &P, 16, NULL);
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mbedtls_mpi_write_file("Q: ", &Q, 16, NULL);
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mbedtls_mpi_write_file("DP: ", &DP, 16, NULL);
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mbedtls_mpi_write_file("DQ: ", &DQ, 16, NULL);
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mbedtls_mpi_write_file("QP: ", &QP, 16, NULL);
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} else
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#endif
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#if defined(MBEDTLS_ECP_C)
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if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_ECKEY) {
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mbedtls_ecp_keypair *ecp = mbedtls_pk_ec(key);
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mbedtls_mpi_write_file("Q(X): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL);
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mbedtls_mpi_write_file("Q(Y): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 16, NULL);
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mbedtls_mpi_write_file("Q(Z): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Z), 16, NULL);
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mbedtls_mpi_write_file("D : ", &ecp->MBEDTLS_PRIVATE(d), 16, NULL);
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} else
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#endif
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mbedtls_printf("key type not supported yet\n");
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} else if (opt.mode == MODE_PUBLIC) {
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/*
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* 1.1. Load the key
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*/
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mbedtls_printf("\n . Loading the public key ...");
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fflush(stdout);
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ret = mbedtls_pk_parse_public_keyfile(&key, opt.filename);
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_parse_public_key returned -0x%04x",
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(unsigned int) -ret);
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goto exit;
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}
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mbedtls_printf(" ok\n");
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/*
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* 1.2 Print the key
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*/
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mbedtls_printf(" . Key information ...\n");
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#if defined(MBEDTLS_RSA_C)
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if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_RSA) {
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa(key);
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if ((ret = mbedtls_rsa_export(rsa, &N, NULL, NULL,
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NULL, &E)) != 0) {
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mbedtls_printf(" failed\n ! could not export RSA parameters\n\n");
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goto exit;
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}
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mbedtls_mpi_write_file("N: ", &N, 16, NULL);
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mbedtls_mpi_write_file("E: ", &E, 16, NULL);
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} else
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#endif
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#if defined(MBEDTLS_ECP_C)
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if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_ECKEY) {
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mbedtls_ecp_keypair *ecp = mbedtls_pk_ec(key);
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mbedtls_mpi_write_file("Q(X): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL);
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mbedtls_mpi_write_file("Q(Y): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 16, NULL);
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mbedtls_mpi_write_file("Q(Z): ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Z), 16, NULL);
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} else
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#endif
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mbedtls_printf("key type not supported yet\n");
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} else {
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goto usage;
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}
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if (opt.output_mode == OUTPUT_MODE_PUBLIC) {
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write_public_key(&key, opt.output_file);
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}
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if (opt.output_mode == OUTPUT_MODE_PRIVATE) {
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write_private_key(&key, opt.output_file);
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}
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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if (exit_code != MBEDTLS_EXIT_SUCCESS) {
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror(ret, buf, sizeof(buf));
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mbedtls_printf(" - %s\n", buf);
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#else
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mbedtls_printf("\n");
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#endif
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}
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mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
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mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP);
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mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP);
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mbedtls_pk_free(&key);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_PK_PARSE_C && MBEDTLS_PK_WRITE_C && MBEDTLS_FS_IO &&
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MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
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