base64_encode_rfc3548
int base64_encode_rfc3548(unsigned char const *, size_t,
base64_encode_rfc3548(srs_hash(env->sc_srs_key, tmp), SHA_DIGEST_LENGTH,
base64_encode_rfc3548(srs_hash(env->sc_srs_key, tmp), SHA_DIGEST_LENGTH,
base64_encode_rfc3548(srs_hash(env->sc_srs_key, tmp + 5), SHA_DIGEST_LENGTH,
base64_encode_rfc3548(srs_hash(env->sc_srs_key, rcpt+5), SHA_DIGEST_LENGTH,
base64_encode_rfc3548(srs_hash(env->sc_srs_key_backup, rcpt+5),
base64_encode_rfc3548(srs_hash(env->sc_srs_key, rcpt+5), SHA_DIGEST_LENGTH,
base64_encode_rfc3548(srs_hash(env->sc_srs_key_backup, rcpt+5),