openssl cms usage

operation = 83
signerfile = "**.cert"

sksigners = sk_OPENSSL_STRING_new_null()
sk_OPENSSL_STRING_push(sksigners, signerfile)

keyfile = signerfile
skkeys = sk_OPENSSL_STRING_new_null()
sk_OPENSSL_STRING_push(skkeys, keyfile)

// again
in = bio_open_default("infile", 'r', 32775)
out = bio_open_default("outfile", 'w', 4)

cms = CMS_sign(NULL, NULL, NULL, in, 16384)

signerfile = sk_OPENSSL_STRING_value(sksigners, 0);
keyfile = sk_OPENSSL_STRING_value(skkeys, 0);

signer = load_cert(signerfile, FORMAT_PEM, "signer certificate")
key = load_key(keyfile, keyform, 0, passin, e, "signing key file")

si = CMS_add1_signer(cms, signer, key, 0, 16384)

CMS_final(cms, in, NULL, flags)

i2d_CMS_bio_stream(out, cms, in, 16384)