


#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;
    STACK_OF(X509) *recips = NULL;
    CMS_ContentInfo *cms = NULL;
    int ret = EXIT_FAILURE;

    
    int flags = CMS_STREAM;

    OpenSSL_add_all_algorithms();
    ERR_load_crypto_strings();

    
    tbio = BIO_new_file("signer.pem", "r");

    if (!tbio)
        goto err;

    rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);

    if (!rcert)
        goto err;

    
    recips = sk_X509_new_null();

    if (!recips || !sk_X509_push(recips, rcert))
        goto err;

    
    rcert = NULL;

    

    in = BIO_new_file("encr.txt", "r");

    if (!in)
        goto err;

    
    cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);

    if (!cms)
        goto err;

    out = BIO_new_file("smencr.txt", "w");
    if (!out)
        goto err;

    
    if (!SMIME_write_CMS(out, cms, in, flags))
        goto err;

    printf("Encryption Successful\n");

    ret = EXIT_SUCCESS;
 err:
    if (ret != EXIT_SUCCESS) {
        fprintf(stderr, "Error Encrypting Data\n");
        ERR_print_errors_fp(stderr);
    }

    CMS_ContentInfo_free(cms);
    X509_free(rcert);
    OSSL_STACK_OF_X509_free(recips);
    BIO_free(in);
    BIO_free(out);
    BIO_free(tbio);
    return ret;
}
