80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/*
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* Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* Simple S/MIME decryption example */
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#include <openssl/pem.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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int main(int argc, char **argv)
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{
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BIO *in = NULL, *out = NULL, *tbio = NULL;
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X509 *rcert = NULL;
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EVP_PKEY *rkey = NULL;
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CMS_ContentInfo *cms = NULL;
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int ret = EXIT_FAILURE;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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/* Read in recipient certificate and private key */
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tbio = BIO_new_file("signer.pem", "r");
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if (!tbio)
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goto err;
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rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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BIO_reset(tbio);
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rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
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if (!rcert || !rkey)
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goto err;
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/* Open S/MIME message to decrypt */
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in = BIO_new_file("smencr.txt", "r");
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if (!in)
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goto err;
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/* Parse message */
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cms = SMIME_read_CMS(in, NULL);
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if (!cms)
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goto err;
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out = BIO_new_file("decout.txt", "w");
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if (!out)
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goto err;
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/* Decrypt S/MIME message */
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if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
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goto err;
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printf("Decryption Successful\n");
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ret = EXIT_SUCCESS;
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err:
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if (ret != EXIT_SUCCESS) {
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fprintf(stderr, "Error Decrypting Data\n");
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ERR_print_errors_fp(stderr);
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}
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CMS_ContentInfo_free(cms);
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X509_free(rcert);
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EVP_PKEY_free(rkey);
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BIO_free(in);
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BIO_free(out);
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BIO_free(tbio);
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return ret;
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}
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