b64_ntop
int b64_ntop(unsigned char const *, size_t, char *, size_t);
b64_ntop(&out_key[6], len - 6, enc_key, sizeof(enc_key));
b64_ntop(&out_key[4], len - 4, enc_key, sizeof(enc_key));
len = b64_ntop(key, key_len, bp, BUF_LEFT);
n = b64_ntop(data, scratch, size, sizeof(scratch));
len = b64_ntop(rdata, key_len, base64_key, siz);
len = b64_ntop(rdata, (size_t)(edata - rdata),
len = b64_ntop(rdata, (size_t)(edata - rdata),
len = b64_ntop(rdata, (size_t)(edata-rdata),
len = b64_ntop(rdata, (size_t)(edata-rdata),
len = b64_ntop(rdata, (size_t)(edata-rdata),