1 /* 2 * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* Simple S/MIME signing example */ 11 #include <openssl/pem.h> 12 #include <openssl/pkcs7.h> 13 #include <openssl/err.h> 14 15 int main(int argc, char **argv) 16 { 17 BIO *in = NULL, *out = NULL, *tbio = NULL; 18 X509 *rcert = NULL; 19 EVP_PKEY *rkey = NULL; 20 PKCS7 *p7 = NULL; 21 int ret = 1; 22 23 OpenSSL_add_all_algorithms(); 24 ERR_load_crypto_strings(); 25 26 /* Read in recipient certificate and private key */ 27 tbio = BIO_new_file("signer.pem", "r"); 28 29 if (!tbio) 30 goto err; 31 32 rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL); 33 34 BIO_reset(tbio); 35 36 rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL); 37 38 if (!rcert || !rkey) 39 goto err; 40 41 /* Open content being signed */ 42 43 in = BIO_new_file("smencr.txt", "r"); 44 45 if (!in) 46 goto err; 47 48 /* Sign content */ 49 p7 = SMIME_read_PKCS7(in, NULL); 50 51 if (!p7) 52 goto err; 53 54 out = BIO_new_file("encrout.txt", "w"); 55 if (!out) 56 goto err; 57 58 /* Decrypt S/MIME message */ 59 if (!PKCS7_decrypt(p7, rkey, rcert, out, 0)) 60 goto err; 61 62 ret = 0; 63 64 err: 65 if (ret) { 66 fprintf(stderr, "Error Signing Data\n"); 67 ERR_print_errors_fp(stderr); 68 } 69 PKCS7_free(p7); 70 X509_free(rcert); 71 EVP_PKEY_free(rkey); 72 BIO_free(in); 73 BIO_free(out); 74 BIO_free(tbio); 75 76 return ret; 77 78 } 79