b64_pton
int b64_pton(char const *src, u_char *target, size_t targsize);
# define __b64_pton(a,b,c) b64_pton(a,b,c)
if ((nlen = b64_pton(b64, p, plen)) < 0) {
int b64_pton(char const *, u_char *, size_t);
siglen = b64_pton(buf2, buf3, sizeof(buf3));
keylen = b64_pton(buf2, buf3, sizeof(buf3));
certlen = b64_pton(buf2, buf3, sizeof(buf3));
bin_len = b64_pton(b64, bin, bin_len);
n = b64_pton(inbuf, outbuf, sizeof(outbuf));