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/*
* Public key-based simple decryption 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_PK_PARSE_C) && \
defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_CTR_DRBG_C)
#include "mbedtls/error.h"
#include "mbedtls/pk.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <stdio.h>
#include <string.h>
#endif
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) || \
!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_CTR_DRBG_C)
int main(void)
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_PK_PARSE_C and/or "
"MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or "
"MBEDTLS_CTR_DRBG_C not defined.\n");
mbedtls_exit(0);
}
#else
int main(int argc, char *argv[])
{
FILE *f;
int ret = 1;
unsigned c;
int exit_code = MBEDTLS_EXIT_FAILURE;
size_t i, olen = 0;
mbedtls_pk_context pk;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char result[1024];
unsigned char buf[512];
const char *pers = "mbedtls_pk_decrypt";
((void) argv);
mbedtls_pk_init(&pk);
mbedtls_entropy_init(&entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
memset(result, 0, sizeof(result));
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status = psa_crypto_init();
if (status != PSA_SUCCESS) {
mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
(int) status);
goto exit;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if (argc != 2) {
mbedtls_printf("usage: mbedtls_pk_decrypt <key_file>\n");
#if defined(_WIN32)
mbedtls_printf("\n");
#endif
goto exit;
}
mbedtls_printf("\n . Seeding the random number generator...");
fflush(stdout);
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;
}
mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
fflush(stdout);
if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x\n",
(unsigned int) -ret);
goto exit;
}
/*
* Extract the RSA encrypted value from the text file
*/
if ((f = fopen("result-enc.txt", "rb")) == NULL) {
mbedtls_printf("\n ! Could not open %s\n\n", "result-enc.txt");
ret = 1;
goto exit;
}
i = 0;
while (fscanf(f, "%02X", (unsigned int *) &c) > 0 &&
i < (int) sizeof(buf)) {
buf[i++] = (unsigned char) c;
}
fclose(f);
/*
* Decrypt the encrypted RSA data and print the result.
*/
mbedtls_printf("\n . Decrypting the encrypted data");
fflush(stdout);
if ((ret = mbedtls_pk_decrypt(&pk, buf, i, result, &olen, sizeof(result),
mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_pk_decrypt returned -0x%04x\n",
(unsigned int) -ret);
goto exit;
}
mbedtls_printf("\n . OK\n\n");
mbedtls_printf("The decrypted result is: '%s'\n\n", result);
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_pk_free(&pk);
mbedtls_entropy_free(&entropy);
mbedtls_ctr_drbg_free(&ctr_drbg);
#if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_psa_crypto_free();
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_ERROR_C)
if (exit_code != MBEDTLS_EXIT_SUCCESS) {
mbedtls_strerror(ret, (char *) buf, sizeof(buf));
mbedtls_printf(" ! Last error was: %s\n", buf);
}
#endif
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
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