| /* |
| * Key generation application |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "mbedtls/build_info.h" |
| |
| #include "mbedtls/platform.h" |
| |
| #if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO) && \ |
| defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C) |
| #include "mbedtls/error.h" |
| #include "mbedtls/pk.h" |
| #include "mbedtls/ecdsa.h" |
| #include "mbedtls/rsa.h" |
| #include "mbedtls/error.h" |
| #include "mbedtls/entropy.h" |
| #include "mbedtls/ctr_drbg.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #if !defined(_WIN32) |
| #include <unistd.h> |
| |
| #define DEV_RANDOM_THRESHOLD 32 |
| |
| int dev_random_entropy_poll(void *data, unsigned char *output, |
| size_t len, size_t *olen) |
| { |
| FILE *file; |
| size_t ret, left = len; |
| unsigned char *p = output; |
| ((void) data); |
| |
| *olen = 0; |
| |
| file = fopen("/dev/random", "rb"); |
| if (file == NULL) { |
| return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
| } |
| |
| while (left > 0) { |
| /* /dev/random can return much less than requested. If so, try again */ |
| ret = fread(p, 1, left, file); |
| if (ret == 0 && ferror(file)) { |
| fclose(file); |
| return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
| } |
| |
| p += ret; |
| left -= ret; |
| sleep(1); |
| } |
| fclose(file); |
| *olen = len; |
| |
| return 0; |
| } |
| #endif /* !_WIN32 */ |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| #define DFL_EC_CURVE mbedtls_ecp_curve_list()->grp_id |
| #else |
| #define DFL_EC_CURVE 0 |
| #endif |
| |
| #if !defined(_WIN32) && defined(MBEDTLS_FS_IO) |
| #define USAGE_DEV_RANDOM \ |
| " use_dev_random=0|1 default: 0\n" |
| #else |
| #define USAGE_DEV_RANDOM "" |
| #endif /* !_WIN32 && MBEDTLS_FS_IO */ |
| |
| #define FORMAT_PEM 0 |
| #define FORMAT_DER 1 |
| |
| #define DFL_TYPE MBEDTLS_PK_RSA |
| #define DFL_RSA_KEYSIZE 4096 |
| #define DFL_FILENAME "keyfile.key" |
| #define DFL_FORMAT FORMAT_PEM |
| #define DFL_USE_DEV_RANDOM 0 |
| |
| #define USAGE \ |
| "\n usage: gen_key param=<>...\n" \ |
| "\n acceptable parameters:\n" \ |
| " type=rsa|ec default: rsa\n" \ |
| " rsa_keysize=%%d default: 4096\n" \ |
| " ec_curve=%%s see below\n" \ |
| " filename=%%s default: keyfile.key\n" \ |
| " format=pem|der default: pem\n" \ |
| USAGE_DEV_RANDOM \ |
| "\n" |
| |
| #if !defined(MBEDTLS_PK_WRITE_C) || !defined(MBEDTLS_PEM_WRITE_C) || \ |
| !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \ |
| !defined(MBEDTLS_CTR_DRBG_C) |
| int main(void) |
| { |
| mbedtls_printf("MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO and/or " |
| "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or " |
| "MBEDTLS_PEM_WRITE_C" |
| "not defined.\n"); |
| mbedtls_exit(0); |
| } |
| #else |
| |
| |
| /* |
| * global options |
| */ |
| struct options { |
| int type; /* the type of key to generate */ |
| int rsa_keysize; /* length of key in bits */ |
| int ec_curve; /* curve identifier for EC keys */ |
| const char *filename; /* filename of the key file */ |
| int format; /* the output format to use */ |
| int use_dev_random; /* use /dev/random as entropy source */ |
| } opt; |
| |
| static int write_private_key(mbedtls_pk_context *key, const char *output_file) |
| { |
| int ret; |
| FILE *f; |
| unsigned char output_buf[16000]; |
| unsigned char *c = output_buf; |
| size_t len = 0; |
| |
| memset(output_buf, 0, 16000); |
| if (opt.format == FORMAT_PEM) { |
| if ((ret = mbedtls_pk_write_key_pem(key, output_buf, 16000)) != 0) { |
| return ret; |
| } |
| |
| len = strlen((char *) output_buf); |
| } else { |
| if ((ret = mbedtls_pk_write_key_der(key, output_buf, 16000)) < 0) { |
| return ret; |
| } |
| |
| len = ret; |
| c = output_buf + sizeof(output_buf) - len; |
| } |
| |
| if ((f = fopen(output_file, "wb")) == NULL) { |
| return -1; |
| } |
| |
| if (fwrite(c, 1, len, f) != len) { |
| fclose(f); |
| return -1; |
| } |
| |
| fclose(f); |
| |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| int ret = 1; |
| int exit_code = MBEDTLS_EXIT_FAILURE; |
| mbedtls_pk_context key; |
| char buf[1024]; |
| int i; |
| char *p, *q; |
| mbedtls_mpi N, P, Q, D, E, DP, DQ, QP; |
| mbedtls_entropy_context entropy; |
| mbedtls_ctr_drbg_context ctr_drbg; |
| const char *pers = "gen_key"; |
| #if defined(MBEDTLS_ECP_C) |
| const mbedtls_ecp_curve_info *curve_info; |
| #endif |
| |
| /* |
| * Set to sane values |
| */ |
| |
| mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q); |
| mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP); |
| mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP); |
| |
| mbedtls_pk_init(&key); |
| mbedtls_ctr_drbg_init(&ctr_drbg); |
| memset(buf, 0, sizeof(buf)); |
| |
| if (argc < 2) { |
| usage: |
| mbedtls_printf(USAGE); |
| #if defined(MBEDTLS_ECP_C) |
| mbedtls_printf(" available ec_curve values:\n"); |
| curve_info = mbedtls_ecp_curve_list(); |
| mbedtls_printf(" %s (default)\n", curve_info->name); |
| while ((++curve_info)->name != NULL) { |
| mbedtls_printf(" %s\n", curve_info->name); |
| } |
| #endif /* MBEDTLS_ECP_C */ |
| goto exit; |
| } |
| |
| opt.type = DFL_TYPE; |
| opt.rsa_keysize = DFL_RSA_KEYSIZE; |
| opt.ec_curve = DFL_EC_CURVE; |
| opt.filename = DFL_FILENAME; |
| opt.format = DFL_FORMAT; |
| opt.use_dev_random = DFL_USE_DEV_RANDOM; |
| |
| for (i = 1; i < argc; i++) { |
| p = argv[i]; |
| if ((q = strchr(p, '=')) == NULL) { |
| goto usage; |
| } |
| *q++ = '\0'; |
| |
| if (strcmp(p, "type") == 0) { |
| if (strcmp(q, "rsa") == 0) { |
| opt.type = MBEDTLS_PK_RSA; |
| } else if (strcmp(q, "ec") == 0) { |
| opt.type = MBEDTLS_PK_ECKEY; |
| } else { |
| goto usage; |
| } |
| } else if (strcmp(p, "format") == 0) { |
| if (strcmp(q, "pem") == 0) { |
| opt.format = FORMAT_PEM; |
| } else if (strcmp(q, "der") == 0) { |
| opt.format = FORMAT_DER; |
| } else { |
| goto usage; |
| } |
| } else if (strcmp(p, "rsa_keysize") == 0) { |
| opt.rsa_keysize = atoi(q); |
| if (opt.rsa_keysize < 1024 || |
| opt.rsa_keysize > MBEDTLS_MPI_MAX_BITS) { |
| goto usage; |
| } |
| } |
| #if defined(MBEDTLS_ECP_C) |
| else if (strcmp(p, "ec_curve") == 0) { |
| if ((curve_info = mbedtls_ecp_curve_info_from_name(q)) == NULL) { |
| goto usage; |
| } |
| opt.ec_curve = curve_info->grp_id; |
| } |
| #endif |
| else if (strcmp(p, "filename") == 0) { |
| opt.filename = q; |
| } else if (strcmp(p, "use_dev_random") == 0) { |
| opt.use_dev_random = atoi(q); |
| if (opt.use_dev_random < 0 || opt.use_dev_random > 1) { |
| goto usage; |
| } |
| } else { |
| goto usage; |
| } |
| } |
| |
| mbedtls_printf("\n . Seeding the random number generator..."); |
| fflush(stdout); |
| |
| mbedtls_entropy_init(&entropy); |
| #if !defined(_WIN32) && defined(MBEDTLS_FS_IO) |
| if (opt.use_dev_random) { |
| if ((ret = mbedtls_entropy_add_source(&entropy, dev_random_entropy_poll, |
| NULL, DEV_RANDOM_THRESHOLD, |
| MBEDTLS_ENTROPY_SOURCE_STRONG)) != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_entropy_add_source returned -0x%04x\n", |
| (unsigned int) -ret); |
| goto exit; |
| } |
| |
| mbedtls_printf("\n Using /dev/random, so can take a long time! "); |
| fflush(stdout); |
| } |
| #endif /* !_WIN32 && MBEDTLS_FS_IO */ |
| |
| if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, |
| (const unsigned char *) pers, |
| strlen(pers))) != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n", |
| (unsigned int) -ret); |
| goto exit; |
| } |
| |
| /* |
| * 1.1. Generate the key |
| */ |
| mbedtls_printf("\n . Generating the private key ..."); |
| fflush(stdout); |
| |
| if ((ret = mbedtls_pk_setup(&key, |
| mbedtls_pk_info_from_type((mbedtls_pk_type_t) opt.type))) != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_pk_setup returned -0x%04x", (unsigned int) -ret); |
| goto exit; |
| } |
| |
| #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) |
| if (opt.type == MBEDTLS_PK_RSA) { |
| ret = mbedtls_rsa_gen_key(mbedtls_pk_rsa(key), mbedtls_ctr_drbg_random, &ctr_drbg, |
| opt.rsa_keysize, 65537); |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_rsa_gen_key returned -0x%04x", |
| (unsigned int) -ret); |
| goto exit; |
| } |
| } else |
| #endif /* MBEDTLS_RSA_C */ |
| #if defined(MBEDTLS_ECP_C) |
| if (opt.type == MBEDTLS_PK_ECKEY) { |
| ret = mbedtls_ecp_gen_key((mbedtls_ecp_group_id) opt.ec_curve, |
| mbedtls_pk_ec(key), |
| mbedtls_ctr_drbg_random, &ctr_drbg); |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_ecp_gen_key returned -0x%04x", |
| (unsigned int) -ret); |
| goto exit; |
| } |
| } else |
| #endif /* MBEDTLS_ECP_C */ |
| { |
| mbedtls_printf(" failed\n ! key type not supported\n"); |
| goto exit; |
| } |
| |
| /* |
| * 1.2 Print the key |
| */ |
| mbedtls_printf(" ok\n . Key information:\n"); |
| |
| #if defined(MBEDTLS_RSA_C) |
| if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_RSA) { |
| mbedtls_rsa_context *rsa = mbedtls_pk_rsa(key); |
| |
| if ((ret = mbedtls_rsa_export(rsa, &N, &P, &Q, &D, &E)) != 0 || |
| (ret = mbedtls_rsa_export_crt(rsa, &DP, &DQ, &QP)) != 0) { |
| mbedtls_printf(" failed\n ! could not export RSA parameters\n\n"); |
| goto exit; |
| } |
| |
| mbedtls_mpi_write_file("N: ", &N, 16, NULL); |
| mbedtls_mpi_write_file("E: ", &E, 16, NULL); |
| mbedtls_mpi_write_file("D: ", &D, 16, NULL); |
| mbedtls_mpi_write_file("P: ", &P, 16, NULL); |
| mbedtls_mpi_write_file("Q: ", &Q, 16, NULL); |
| mbedtls_mpi_write_file("DP: ", &DP, 16, NULL); |
| mbedtls_mpi_write_file("DQ: ", &DQ, 16, NULL); |
| mbedtls_mpi_write_file("QP: ", &QP, 16, NULL); |
| } else |
| #endif |
| #if defined(MBEDTLS_ECP_C) |
| if (mbedtls_pk_get_type(&key) == MBEDTLS_PK_ECKEY) { |
| mbedtls_ecp_keypair *ecp = mbedtls_pk_ec(key); |
| mbedtls_printf("curve: %s\n", |
| mbedtls_ecp_curve_info_from_grp_id(ecp->MBEDTLS_PRIVATE(grp).id)->name); |
| mbedtls_mpi_write_file("X_Q: ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(X), 16, NULL); |
| mbedtls_mpi_write_file("Y_Q: ", &ecp->MBEDTLS_PRIVATE(Q).MBEDTLS_PRIVATE(Y), 16, NULL); |
| mbedtls_mpi_write_file("D: ", &ecp->MBEDTLS_PRIVATE(d), 16, NULL); |
| } else |
| #endif |
| mbedtls_printf(" ! key type not supported\n"); |
| |
| /* |
| * 1.3 Export key |
| */ |
| mbedtls_printf(" . Writing key to file..."); |
| |
| if ((ret = write_private_key(&key, opt.filename)) != 0) { |
| mbedtls_printf(" failed\n"); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| exit_code = MBEDTLS_EXIT_SUCCESS; |
| |
| exit: |
| |
| if (exit_code != MBEDTLS_EXIT_SUCCESS) { |
| #ifdef MBEDTLS_ERROR_C |
| mbedtls_strerror(ret, buf, sizeof(buf)); |
| mbedtls_printf(" - %s\n", buf); |
| #else |
| mbedtls_printf("\n"); |
| #endif |
| } |
| |
| mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q); |
| mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP); |
| mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP); |
| |
| mbedtls_pk_free(&key); |
| mbedtls_ctr_drbg_free(&ctr_drbg); |
| mbedtls_entropy_free(&entropy); |
| |
| mbedtls_exit(exit_code); |
| } |
| #endif /* MBEDTLS_PK_WRITE_C && MBEDTLS_PEM_WRITE_C && MBEDTLS_FS_IO && |
| * MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */ |