radius_encrypt_user_password_attr
int radius_encrypt_user_password_attr(void *, size_t *,
if (radius_encrypt_user_password_attr(cipher, &clen, buf,
CHECK(radius_encrypt_user_password_attr(cipher, &clen, "challenge", ra, "xyzzy5461") == 0);
CHECK(radius_encrypt_user_password_attr(cipher, &clen, "challenge", ra, "xyzzy5461") != 0);
radius_encrypt_user_password_attr(cipher, &clen, "foobarbaz", radius_get_authenticator_retval(packet), "sharedsecret");