b64_pton
int b64_pton(char const *, u_char *, 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));
n = b64_pton(inbuf, outbuf, sizeof(outbuf));
ret = b64_pton(key_b64, key, KEY_LEN);
ret = b64_pton(keyb64buf, keybuf, KEY_LEN);