89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
/* Simple S/MIME signing 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 *scert = NULL;
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EVP_PKEY *skey = NULL;
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CMS_ContentInfo *cms = NULL;
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int ret = 1;
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/*
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* For simple S/MIME signing use CMS_DETACHED. On OpenSSL 1.0.0 only: for
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* streaming detached set CMS_DETACHED|CMS_STREAM for streaming
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* non-detached set CMS_STREAM
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*/
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int flags = CMS_DETACHED | CMS_STREAM;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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/* Read in signer 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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scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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BIO_reset(tbio);
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skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
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if (!scert || !skey)
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goto err;
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/* Open content being signed */
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in = BIO_new_file("sign.txt", "r");
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if (!in)
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goto err;
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/* Sign content */
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cms = CMS_sign(scert, skey, NULL, in, flags);
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if (!cms)
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goto err;
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out = BIO_new_file("smout.txt", "w");
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if (!out)
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goto err;
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if (!(flags & CMS_STREAM))
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BIO_reset(in);
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/* Write out S/MIME message */
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if (!SMIME_write_CMS(out, cms, in, flags))
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goto err;
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ret = 0;
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err:
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if (ret) {
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fprintf(stderr, "Error Signing Data\n");
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ERR_print_errors_fp(stderr);
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}
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if (cms)
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CMS_ContentInfo_free(cms);
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if (scert)
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X509_free(scert);
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if (skey)
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EVP_PKEY_free(skey);
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if (in)
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BIO_free(in);
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if (out)
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BIO_free(out);
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if (tbio)
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BIO_free(tbio);
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return ret;
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}
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