b64_pton
int b64_pton __P((char const *, uchar_t *, size_t));
dlen = b64_pton(notspace, deckey, sizeof(deckey));
key_len = b64_pton((char *)tmp, key, HMAC_LEN+1); /*%< see above */
siglen = b64_pton(buf2, buf3, sizeof(buf3));
keylen = b64_pton(buf2, buf3, sizeof(buf3));
certlen = b64_pton(buf2, buf3, sizeof(buf3));