141 lines
4.7 KiB
C
141 lines
4.7 KiB
C
/*
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* Example RSA key generation program
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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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_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) && \
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defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/bignum.h"
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#include "mbedtls/rsa.h"
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#include <stdio.h>
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#include <string.h>
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#endif
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#define KEY_SIZE 2048
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#define EXPONENT 65537
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_GENPRIME) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_RSA_C and/or MBEDTLS_GENPRIME and/or "
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"MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C not defined.\n");
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mbedtls_exit(0);
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}
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#else
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int main(void)
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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_rsa_context rsa;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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FILE *fpub = NULL;
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FILE *fpriv = NULL;
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const char *pers = "rsa_genkey";
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_rsa_init(&rsa);
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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_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 ((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 %d\n", ret);
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goto exit;
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}
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mbedtls_printf(" ok\n . Generating the RSA key [ %d-bit ]...", KEY_SIZE);
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fflush(stdout);
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if ((ret = mbedtls_rsa_gen_key(&rsa, mbedtls_ctr_drbg_random, &ctr_drbg, KEY_SIZE,
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EXPONENT)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_rsa_gen_key returned %d\n\n", ret);
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goto exit;
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}
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mbedtls_printf(" ok\n . Exporting the public key in rsa_pub.txt....");
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fflush(stdout);
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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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if ((fpub = fopen("rsa_pub.txt", "wb+")) == NULL) {
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mbedtls_printf(" failed\n ! could not open rsa_pub.txt for writing\n\n");
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goto exit;
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}
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if ((ret = mbedtls_mpi_write_file("N = ", &N, 16, fpub)) != 0 ||
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(ret = mbedtls_mpi_write_file("E = ", &E, 16, fpub)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret);
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goto exit;
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}
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mbedtls_printf(" ok\n . Exporting the private key in rsa_priv.txt...");
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fflush(stdout);
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if ((fpriv = fopen("rsa_priv.txt", "wb+")) == NULL) {
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mbedtls_printf(" failed\n ! could not open rsa_priv.txt for writing\n");
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goto exit;
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}
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if ((ret = mbedtls_mpi_write_file("N = ", &N, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("E = ", &E, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("D = ", &D, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("P = ", &P, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("Q = ", &Q, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("DP = ", &DP, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("DQ = ", &DQ, 16, fpriv)) != 0 ||
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(ret = mbedtls_mpi_write_file("QP = ", &QP, 16, fpriv)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret);
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goto exit;
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}
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mbedtls_printf(" ok\n\n");
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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if (fpub != NULL) {
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fclose(fpub);
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}
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if (fpriv != NULL) {
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fclose(fpriv);
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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_rsa_free(&rsa);
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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_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
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MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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