99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
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/*
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* S/MIME detached data encrypt example: rarely done but should the need
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* 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, *dout = NULL;
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X509 *rcert = NULL;
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STACK_OF(X509) *recips = NULL;
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CMS_ContentInfo *cms = NULL;
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int ret = 1;
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int flags = CMS_STREAM | CMS_DETACHED;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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/* Read in recipient certificate */
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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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if (!rcert)
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goto err;
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/* Create recipient STACK and add recipient cert to it */
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recips = sk_X509_new_null();
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if (!recips || !sk_X509_push(recips, rcert))
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goto err;
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/*
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* sk_X509_pop_free will free up recipient STACK and its contents so set
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* rcert to NULL so it isn't freed up twice.
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*/
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rcert = NULL;
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/* Open content being encrypted */
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in = BIO_new_file("encr.txt", "r");
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dout = BIO_new_file("smencr.out", "wb");
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if (!in)
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goto err;
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/* encrypt content */
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cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
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if (!cms)
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goto err;
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out = BIO_new_file("smencr.pem", "w");
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if (!out)
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goto err;
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if (!CMS_final(cms, in, dout, flags))
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goto err;
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/* Write out CMS structure without content */
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if (!PEM_write_bio_CMS(out, cms))
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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 Encrypting 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 (recips)
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sk_X509_pop_free(recips, X509_free);
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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 (dout)
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BIO_free(dout);
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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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