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/*
* RSA simple data encryption program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
defined(MBEDTLS_CTR_DRBG_C)
#include "mbedtls/rsa.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <string.h>
#endif
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
!defined(MBEDTLS_CTR_DRBG_C)
int main(void)
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
"MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
"MBEDTLS_CTR_DRBG_C not defined.\n");
mbedtls_exit(0);
}
#else
int main(int argc, char *argv[])
{
FILE *f;
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
size_t i;
mbedtls_rsa_context rsa;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char input[1024];
unsigned char buf[512];
const char *pers = "rsa_encrypt";
mbedtls_mpi N, E;
if (argc != 2) {
mbedtls_printf("usage: rsa_encrypt <string of max 100 characters>\n");
#if defined(_WIN32)
mbedtls_printf("\n");
#endif
mbedtls_exit(exit_code);
}
mbedtls_printf("\n . Seeding the random number generator...");
fflush(stdout);
mbedtls_mpi_init(&N); mbedtls_mpi_init(&E);
mbedtls_rsa_init(&rsa);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_entropy_init(&entropy);
ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
&entropy, (const unsigned char *) pers,
strlen(pers));
if (ret != 0) {
mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n",
ret);
goto exit;
}
mbedtls_printf("\n . Reading public key from rsa_pub.txt");
fflush(stdout);
if ((f = fopen("rsa_pub.txt", "rb")) == NULL) {
mbedtls_printf(" failed\n ! Could not open rsa_pub.txt\n" \
" ! Please run rsa_genkey first\n\n");
goto exit;
}
if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&E, 16, f)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n",
ret);
fclose(f);
goto exit;
}
fclose(f);
if ((ret = mbedtls_rsa_import(&rsa, &N, NULL, NULL, NULL, &E)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_import returned %d\n\n",
ret);
goto exit;
}
if (strlen(argv[1]) > 100) {
mbedtls_printf(" Input data larger than 100 characters.\n\n");
goto exit;
}
memcpy(input, argv[1], strlen(argv[1]));
/*
* Calculate the RSA encryption of the hash.
*/
mbedtls_printf("\n . Generating the RSA encrypted value");
fflush(stdout);
ret = mbedtls_rsa_pkcs1_encrypt(&rsa, mbedtls_ctr_drbg_random,
&ctr_drbg, strlen(argv[1]), input, buf);
if (ret != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
ret);
goto exit;
}
/*
* Write the signature into result-enc.txt
*/
if ((f = fopen("result-enc.txt", "wb+")) == NULL) {
mbedtls_printf(" failed\n ! Could not create %s\n\n", "result-enc.txt");
goto exit;
}
for (i = 0; i < mbedtls_rsa_get_len(&rsa); i++) {
mbedtls_fprintf(f, "%02X%s", buf[i],
(i + 1) % 16 == 0 ? "\r\n" : " ");
}
fclose(f);
mbedtls_printf("\n . Done (created \"%s\")\n\n", "result-enc.txt");
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_mpi_free(&N); mbedtls_mpi_free(&E);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
mbedtls_rsa_free(&rsa);
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_ENTROPY_C &&
MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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