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Commit | Line | Data |
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b2b2dafc DSH |
1 | /* Simple S/MIME signing example */ |
2 | #include <openssl/pem.h> | |
3 | #include <openssl/pkcs7.h> | |
4 | #include <openssl/err.h> | |
5 | ||
6 | int main(int argc, char **argv) | |
0f113f3e MC |
7 | { |
8 | BIO *in = NULL, *out = NULL, *tbio = NULL; | |
9 | X509 *scert = NULL; | |
10 | EVP_PKEY *skey = NULL; | |
11 | PKCS7 *p7 = NULL; | |
12 | int ret = 1; | |
b2b2dafc | 13 | |
0f113f3e MC |
14 | /* |
15 | * For simple S/MIME signing use PKCS7_DETACHED. On OpenSSL 0.9.9 only: | |
16 | * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM for streaming | |
17 | * non-detached set PKCS7_STREAM | |
18 | */ | |
19 | int flags = PKCS7_DETACHED | PKCS7_STREAM; | |
b2b2dafc | 20 | |
0f113f3e MC |
21 | OpenSSL_add_all_algorithms(); |
22 | ERR_load_crypto_strings(); | |
b2b2dafc | 23 | |
0f113f3e MC |
24 | /* Read in signer certificate and private key */ |
25 | tbio = BIO_new_file("signer.pem", "r"); | |
b2b2dafc | 26 | |
0f113f3e MC |
27 | if (!tbio) |
28 | goto err; | |
b2b2dafc | 29 | |
0f113f3e | 30 | scert = PEM_read_bio_X509(tbio, NULL, 0, NULL); |
b2b2dafc | 31 | |
0f113f3e | 32 | BIO_reset(tbio); |
b2b2dafc | 33 | |
0f113f3e | 34 | skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL); |
b2b2dafc | 35 | |
0f113f3e MC |
36 | if (!scert || !skey) |
37 | goto err; | |
b2b2dafc | 38 | |
0f113f3e | 39 | /* Open content being signed */ |
b2b2dafc | 40 | |
0f113f3e | 41 | in = BIO_new_file("sign.txt", "r"); |
b2b2dafc | 42 | |
0f113f3e MC |
43 | if (!in) |
44 | goto err; | |
b2b2dafc | 45 | |
0f113f3e MC |
46 | /* Sign content */ |
47 | p7 = PKCS7_sign(scert, skey, NULL, in, flags); | |
b2b2dafc | 48 | |
0f113f3e MC |
49 | if (!p7) |
50 | goto err; | |
b2b2dafc | 51 | |
0f113f3e MC |
52 | out = BIO_new_file("smout.txt", "w"); |
53 | if (!out) | |
54 | goto err; | |
b2b2dafc | 55 | |
0f113f3e MC |
56 | if (!(flags & PKCS7_STREAM)) |
57 | BIO_reset(in); | |
b2b2dafc | 58 | |
0f113f3e MC |
59 | /* Write out S/MIME message */ |
60 | if (!SMIME_write_PKCS7(out, p7, in, flags)) | |
61 | goto err; | |
b2b2dafc | 62 | |
0f113f3e | 63 | ret = 0; |
b2b2dafc | 64 | |
0f113f3e | 65 | err: |
0f113f3e MC |
66 | if (ret) { |
67 | fprintf(stderr, "Error Signing Data\n"); | |
68 | ERR_print_errors_fp(stderr); | |
69 | } | |
e0e920b1 | 70 | PKCS7_free(p7); |
222561fe | 71 | X509_free(scert); |
c5ba2d99 | 72 | EVP_PKEY_free(skey); |
ca3a82c3 RS |
73 | BIO_free(in); |
74 | BIO_free(out); | |
75 | BIO_free(tbio); | |
b2b2dafc | 76 | |
0f113f3e | 77 | return ret; |
b2b2dafc | 78 | |
0f113f3e | 79 | } |