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/* Simple S/MIME encrypt 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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BIO *in = NULL, *out = NULL, *tbio = NULL;
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STACK_OF(X509) *recips = NULL;
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CMS_ContentInfo *cms = NULL;
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* On OpenSSL 1.0.0 and later only:
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* for streaming set CMS_STREAM
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int flags = CMS_STREAM;
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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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rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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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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/* sk_X509_pop_free will free up recipient STACK and its contents
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* so set rcert to NULL so it isn't freed up twice.
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/* Open content being encrypted */
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in = BIO_new_file("encr.txt", "r");
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cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
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out = BIO_new_file("smencr.txt", "w");
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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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fprintf(stderr, "Error Encrypting Data\n");
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ERR_print_errors_fp(stderr);
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CMS_ContentInfo_free(cms);
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sk_X509_pop_free(recips, X509_free);