90 lines
1.5 KiB
C
90 lines
1.5 KiB
C
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/* S/MIME detached data decrypt example: rarely done but
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* should the need arise this is an example....
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*/
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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, *dcont = 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 = 1;
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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 PEM file containing enveloped data */
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in = BIO_new_file("smencr.pem", "r");
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if (!in)
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goto err;
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/* Parse PEM content */
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cms = PEM_read_bio_CMS(in, NULL, 0, NULL);
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if (!cms)
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goto err;
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/* Open file containing detached content */
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dcont = BIO_new_file("smencr.out", "rb");
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if (!in)
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goto err;
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out = BIO_new_file("encrout.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, dcont, out, 0))
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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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{
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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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if (cms)
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CMS_ContentInfo_free(cms);
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if (rcert)
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X509_free(rcert);
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if (rkey)
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EVP_PKEY_free(rkey);
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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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if (dcont)
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BIO_free(dcont);
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return ret;
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}
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