149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* RSA simple data encryption 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_RSA_C) && \
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defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
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defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/rsa.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <string.h>
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#endif
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
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!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
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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_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
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"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(int argc, char *argv[])
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{
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FILE *f;
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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size_t i;
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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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unsigned char input[1024];
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unsigned char buf[512];
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const char *pers = "rsa_encrypt";
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mbedtls_mpi N, E;
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if (argc != 2) {
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mbedtls_printf("usage: rsa_encrypt <string of max 100 characters>\n");
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#if defined(_WIN32)
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mbedtls_printf("\n");
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#endif
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mbedtls_exit(exit_code);
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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_mpi_init(&N); mbedtls_mpi_init(&E);
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mbedtls_rsa_init(&rsa);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
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&entropy, (const unsigned char *) pers,
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strlen(pers));
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n",
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ret);
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goto exit;
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}
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mbedtls_printf("\n . Reading public key from rsa_pub.txt");
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fflush(stdout);
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if ((f = fopen("rsa_pub.txt", "rb")) == NULL) {
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mbedtls_printf(" failed\n ! Could not open rsa_pub.txt\n" \
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" ! Please run rsa_genkey first\n\n");
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goto exit;
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}
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if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
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(ret = mbedtls_mpi_read_file(&E, 16, f)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n",
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ret);
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fclose(f);
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goto exit;
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}
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fclose(f);
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if ((ret = mbedtls_rsa_import(&rsa, &N, NULL, NULL, NULL, &E)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_rsa_import returned %d\n\n",
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ret);
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goto exit;
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}
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if (strlen(argv[1]) > 100) {
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mbedtls_printf(" Input data larger than 100 characters.\n\n");
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goto exit;
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}
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memcpy(input, argv[1], strlen(argv[1]));
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/*
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* Calculate the RSA encryption of the hash.
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*/
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mbedtls_printf("\n . Generating the RSA encrypted value");
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fflush(stdout);
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ret = mbedtls_rsa_pkcs1_encrypt(&rsa, mbedtls_ctr_drbg_random,
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&ctr_drbg, strlen(argv[1]), input, buf);
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if (ret != 0) {
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mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
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ret);
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goto exit;
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}
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/*
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* Write the signature into result-enc.txt
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*/
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if ((f = fopen("result-enc.txt", "wb+")) == NULL) {
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mbedtls_printf(" failed\n ! Could not create %s\n\n", "result-enc.txt");
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goto exit;
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}
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for (i = 0; i < rsa.MBEDTLS_PRIVATE(len); i++) {
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mbedtls_fprintf(f, "%02X%s", buf[i],
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(i + 1) % 16 == 0 ? "\r\n" : " ");
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}
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fclose(f);
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mbedtls_printf("\n . Done (created \"%s\")\n\n", "result-enc.txt");
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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mbedtls_rsa_free(&rsa);
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_ENTROPY_C &&
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MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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