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| 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) |
| 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; |
| 13 |
| 14 /* For simple S/MIME signing use PKCS7_DETACHED. |
| 15 * On OpenSSL 0.9.9 only: |
| 16 * for streaming detached set PKCS7_DETACHED|PKCS7_STREAM |
| 17 * for streaming non-detached set PKCS7_STREAM |
| 18 */ |
| 19 int flags = PKCS7_DETACHED|PKCS7_STREAM; |
| 20 |
| 21 OpenSSL_add_all_algorithms(); |
| 22 ERR_load_crypto_strings(); |
| 23 |
| 24 /* Read in signer certificate and private key */ |
| 25 tbio = BIO_new_file("signer.pem", "r"); |
| 26 |
| 27 if (!tbio) |
| 28 goto err; |
| 29 |
| 30 scert = PEM_read_bio_X509(tbio, NULL, 0, NULL); |
| 31 |
| 32 BIO_reset(tbio); |
| 33 |
| 34 skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL); |
| 35 |
| 36 if (!scert || !skey) |
| 37 goto err; |
| 38 |
| 39 /* Open content being signed */ |
| 40 |
| 41 in = BIO_new_file("sign.txt", "r"); |
| 42 |
| 43 if (!in) |
| 44 goto err; |
| 45 |
| 46 /* Sign content */ |
| 47 p7 = PKCS7_sign(scert, skey, NULL, in, flags); |
| 48 |
| 49 if (!p7) |
| 50 goto err; |
| 51 |
| 52 out = BIO_new_file("smout.txt", "w"); |
| 53 if (!out) |
| 54 goto err; |
| 55 |
| 56 if (!(flags & PKCS7_STREAM)) |
| 57 BIO_reset(in); |
| 58 |
| 59 /* Write out S/MIME message */ |
| 60 if (!SMIME_write_PKCS7(out, p7, in, flags)) |
| 61 goto err; |
| 62 |
| 63 ret = 0; |
| 64 |
| 65 err: |
| 66 |
| 67 if (ret) |
| 68 { |
| 69 fprintf(stderr, "Error Signing Data\n"); |
| 70 ERR_print_errors_fp(stderr); |
| 71 } |
| 72 |
| 73 if (p7) |
| 74 PKCS7_free(p7); |
| 75 if (scert) |
| 76 X509_free(scert); |
| 77 if (skey) |
| 78 EVP_PKEY_free(skey); |
| 79 |
| 80 if (in) |
| 81 BIO_free(in); |
| 82 if (out) |
| 83 BIO_free(out); |
| 84 if (tbio) |
| 85 BIO_free(tbio); |
| 86 |
| 87 return ret; |
| 88 |
| 89 } |
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