153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/*
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* Public key-based simple decryption program
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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_PK_PARSE_C) && \
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defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/error.h"
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#include "mbedtls/pk.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#include <string.h>
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#endif
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
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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_PK_PARSE_C and/or "
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"MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C 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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unsigned c;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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size_t i, olen = 0;
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mbedtls_pk_context pk;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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unsigned char result[1024];
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unsigned char buf[512];
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const char *pers = "mbedtls_pk_decrypt";
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((void) argv);
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mbedtls_pk_init(&pk);
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mbedtls_entropy_init(&entropy);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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memset(result, 0, sizeof(result));
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if (argc != 2) {
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mbedtls_printf("usage: mbedtls_pk_decrypt <key_file>\n");
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#if defined(_WIN32)
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mbedtls_printf("\n");
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#endif
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goto exit;
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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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if ((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))) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
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(unsigned int) -ret);
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goto exit;
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}
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mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
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fflush(stdout);
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if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
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mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x\n",
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(unsigned int) -ret);
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goto exit;
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}
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/*
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* Extract the RSA encrypted value from the text file
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*/
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if ((f = fopen("result-enc.txt", "rb")) == NULL) {
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mbedtls_printf("\n ! Could not open %s\n\n", "result-enc.txt");
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ret = 1;
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goto exit;
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}
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i = 0;
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while (fscanf(f, "%02X", (unsigned int *) &c) > 0 &&
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i < (int) sizeof(buf)) {
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buf[i++] = (unsigned char) c;
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}
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fclose(f);
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/*
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* Decrypt the encrypted RSA data and print the result.
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*/
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mbedtls_printf("\n . Decrypting the encrypted data");
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fflush(stdout);
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if ((ret = mbedtls_pk_decrypt(&pk, buf, i, result, &olen, sizeof(result),
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mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_decrypt returned -0x%04x\n",
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(unsigned int) -ret);
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goto exit;
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}
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mbedtls_printf("\n . OK\n\n");
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mbedtls_printf("The decrypted result is: '%s'\n\n", result);
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_pk_free(&pk);
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mbedtls_entropy_free(&entropy);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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#if defined(MBEDTLS_ERROR_C)
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if (exit_code != MBEDTLS_EXIT_SUCCESS) {
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mbedtls_strerror(ret, (char *) buf, sizeof(buf));
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mbedtls_printf(" ! Last error was: %s\n", buf);
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}
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#endif
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
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MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
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