414 lines
13 KiB
C
414 lines
13 KiB
C
/*
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* Key generation 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_WRITE_C) && 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/ecdsa.h"
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#include "mbedtls/rsa.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 <stdlib.h>
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#include <string.h>
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#if !defined(_WIN32)
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#include <unistd.h>
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#define DEV_RANDOM_THRESHOLD 32
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int dev_random_entropy_poll(void *data, unsigned char *output,
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size_t len, size_t *olen)
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{
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FILE *file;
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size_t ret, left = len;
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unsigned char *p = output;
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((void) data);
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*olen = 0;
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file = fopen("/dev/random", "rb");
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if (file == NULL) {
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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while (left > 0) {
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/* /dev/random can return much less than requested. If so, try again */
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ret = fread(p, 1, left, file);
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if (ret == 0 && ferror(file)) {
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fclose(file);
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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p += ret;
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left -= ret;
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sleep(1);
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}
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fclose(file);
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*olen = len;
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return 0;
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}
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#endif /* !_WIN32 */
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#endif
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#if defined(MBEDTLS_ECP_C)
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#define DFL_EC_CURVE mbedtls_ecp_curve_list()->grp_id
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#else
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#define DFL_EC_CURVE 0
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#endif
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#if !defined(_WIN32) && defined(MBEDTLS_FS_IO)
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#define USAGE_DEV_RANDOM \
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" use_dev_random=0|1 default: 0\n"
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#else
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#define USAGE_DEV_RANDOM ""
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#endif /* !_WIN32 && MBEDTLS_FS_IO */
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#define FORMAT_PEM 0
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#define FORMAT_DER 1
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#define DFL_TYPE MBEDTLS_PK_RSA
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#define DFL_RSA_KEYSIZE 4096
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#define DFL_FILENAME "keyfile.key"
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#define DFL_FORMAT FORMAT_PEM
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#define DFL_USE_DEV_RANDOM 0
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#define USAGE \
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"\n usage: gen_key param=<>...\n" \
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"\n acceptable parameters:\n" \
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" type=rsa|ec default: rsa\n" \
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" rsa_keysize=%%d default: 4096\n" \
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" ec_curve=%%s see below\n" \
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" filename=%%s default: keyfile.key\n" \
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" format=pem|der default: pem\n" \
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USAGE_DEV_RANDOM \
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"\n"
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#if !defined(MBEDTLS_PK_WRITE_C) || !defined(MBEDTLS_PEM_WRITE_C) || \
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!defined(MBEDTLS_FS_IO) || !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_WRITE_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
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"MBEDTLS_PEM_WRITE_C"
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"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 type; /* the type of key to generate */
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int rsa_keysize; /* length of key in bits */
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int ec_curve; /* curve identifier for EC keys */
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const char *filename; /* filename of the key file */
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int format; /* the output format to use */
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int use_dev_random; /* use /dev/random as entropy source */
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} opt;
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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 (opt.format == 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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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, "wb")) == 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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mbedtls_pk_context key;
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char buf[1024];
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int i;
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char *p, *q;
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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const char *pers = "gen_key";
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#if defined(MBEDTLS_ECP_C)
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const mbedtls_ecp_curve_info *curve_info;
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#endif
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/*
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* Set to sane values
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*/
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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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mbedtls_pk_init(&key);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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memset(buf, 0, sizeof(buf));
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if (argc == 0) {
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usage:
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mbedtls_printf(USAGE);
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#if defined(MBEDTLS_ECP_C)
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mbedtls_printf(" available ec_curve values:\n");
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curve_info = mbedtls_ecp_curve_list();
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mbedtls_printf(" %s (default)\n", curve_info->name);
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while ((++curve_info)->name != NULL) {
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mbedtls_printf(" %s\n", curve_info->name);
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}
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#endif /* MBEDTLS_ECP_C */
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goto exit;
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}
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opt.type = DFL_TYPE;
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opt.rsa_keysize = DFL_RSA_KEYSIZE;
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opt.ec_curve = DFL_EC_CURVE;
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opt.filename = DFL_FILENAME;
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opt.format = DFL_FORMAT;
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opt.use_dev_random = DFL_USE_DEV_RANDOM;
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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, "type") == 0) {
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if (strcmp(q, "rsa") == 0) {
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opt.type = MBEDTLS_PK_RSA;
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} else if (strcmp(q, "ec") == 0) {
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opt.type = MBEDTLS_PK_ECKEY;
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} else {
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goto usage;
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}
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} else if (strcmp(p, "format") == 0) {
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if (strcmp(q, "pem") == 0) {
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opt.format = FORMAT_PEM;
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} else if (strcmp(q, "der") == 0) {
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opt.format = 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, "rsa_keysize") == 0) {
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opt.rsa_keysize = atoi(q);
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if (opt.rsa_keysize < 1024 ||
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opt.rsa_keysize > MBEDTLS_MPI_MAX_BITS) {
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goto usage;
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}
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}
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#if defined(MBEDTLS_ECP_C)
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else if (strcmp(p, "ec_curve") == 0) {
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if ((curve_info = mbedtls_ecp_curve_info_from_name(q)) == NULL) {
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goto usage;
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}
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opt.ec_curve = curve_info->grp_id;
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}
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#endif
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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, "use_dev_random") == 0) {
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opt.use_dev_random = atoi(q);
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if (opt.use_dev_random < 0 || opt.use_dev_random > 1) {
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goto usage;
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}
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} else {
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goto usage;
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}
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}
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mbedtls_printf("\n . Seeding the random number generator...");
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fflush(stdout);
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mbedtls_entropy_init(&entropy);
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#if !defined(_WIN32) && defined(MBEDTLS_FS_IO)
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if (opt.use_dev_random) {
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if ((ret = mbedtls_entropy_add_source(&entropy, dev_random_entropy_poll,
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NULL, DEV_RANDOM_THRESHOLD,
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MBEDTLS_ENTROPY_SOURCE_STRONG)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_entropy_add_source 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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mbedtls_printf("\n Using /dev/random, so can take a long time! ");
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fflush(stdout);
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}
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#endif /* !_WIN32 && MBEDTLS_FS_IO */
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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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/*
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* 1.1. Generate the key
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*/
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mbedtls_printf("\n . Generating the private key ...");
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fflush(stdout);
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if ((ret = mbedtls_pk_setup(&key,
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mbedtls_pk_info_from_type((mbedtls_pk_type_t) opt.type))) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_setup returned -0x%04x", (unsigned int) -ret);
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goto exit;
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}
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#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
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if (opt.type == MBEDTLS_PK_RSA) {
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ret = mbedtls_rsa_gen_key(mbedtls_pk_rsa(key), mbedtls_ctr_drbg_random, &ctr_drbg,
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opt.rsa_keysize, 65537);
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_rsa_gen_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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} else
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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if (opt.type == MBEDTLS_PK_ECKEY) {
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ret = mbedtls_ecp_gen_key((mbedtls_ecp_group_id) opt.ec_curve,
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mbedtls_pk_ec(key),
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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_ecp_gen_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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} else
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#endif /* MBEDTLS_ECP_C */
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{
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mbedtls_printf(" failed\n ! key type not supported\n");
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goto exit;
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}
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/*
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* 1.2 Print the key
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*/
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mbedtls_printf(" ok\n . 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_printf("curve: %s\n",
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mbedtls_ecp_curve_info_from_grp_id(ecp->MBEDTLS_PRIVATE(grp).id)->name);
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mbedtls_mpi_write_file("X_Q: ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL);
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mbedtls_mpi_write_file("Y_Q: ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 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\n");
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/*
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* 1.3 Export key
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*/
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mbedtls_printf(" . Writing key to file...");
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if ((ret = write_private_key(&key, opt.filename)) != 0) {
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mbedtls_printf(" failed\n");
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goto exit;
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}
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mbedtls_printf(" ok\n");
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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_WRITE_C && MBEDTLS_PEM_WRITE_C && MBEDTLS_FS_IO &&
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* MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
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