79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
|
/* Simple S/MIME decryption example */
|
||
|
|
#include <openssl/pem.h>
|
||
|
|
#include <openssl/cms.h>
|
||
|
|
#include <openssl/err.h>
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
BIO *in = NULL, *out = NULL, *tbio = NULL;
|
||
|
|
X509 *rcert = NULL;
|
||
|
|
EVP_PKEY *rkey = NULL;
|
||
|
|
CMS_ContentInfo *cms = NULL;
|
||
|
|
int ret = 1;
|
||
|
|
|
||
|
|
OpenSSL_add_all_algorithms();
|
||
|
|
ERR_load_crypto_strings();
|
||
|
|
|
||
|
|
/* Read in recipient certificate and private key */
|
||
|
|
tbio = BIO_new_file("signer.pem", "r");
|
||
|
|
|
||
|
|
if (!tbio)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
|
||
|
|
|
||
|
|
BIO_reset(tbio);
|
||
|
|
|
||
|
|
rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
|
||
|
|
|
||
|
|
if (!rcert || !rkey)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
/* Open S/MIME message to decrypt */
|
||
|
|
|
||
|
|
in = BIO_new_file("smencr.txt", "r");
|
||
|
|
|
||
|
|
if (!in)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
/* Parse message */
|
||
|
|
cms = SMIME_read_CMS(in, NULL);
|
||
|
|
|
||
|
|
if (!cms)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
out = BIO_new_file("decout.txt", "w");
|
||
|
|
if (!out)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
/* Decrypt S/MIME message */
|
||
|
|
if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
err:
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
fprintf(stderr, "Error Decrypting Data\n");
|
||
|
|
ERR_print_errors_fp(stderr);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cms)
|
||
|
|
CMS_ContentInfo_free(cms);
|
||
|
|
if (rcert)
|
||
|
|
X509_free(rcert);
|
||
|
|
if (rkey)
|
||
|
|
EVP_PKEY_free(rkey);
|
||
|
|
|
||
|
|
if (in)
|
||
|
|
BIO_free(in);
|
||
|
|
if (out)
|
||
|
|
BIO_free(out);
|
||
|
|
if (tbio)
|
||
|
|
BIO_free(tbio);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
}
|