radius_decrypt_user_password_attr
int radius_decrypt_user_password_attr(char *, size_t,
if (radius_decrypt_user_password_attr(buf, len, cipher, clen,
CHECK(radius_decrypt_user_password_attr(plain, sizeof(plain), cipher, clen, ra, "xyzzy5461") == 0);
CHECK(radius_decrypt_user_password_attr(plain, 16, cipher, 16, ra, "xyzzy5461") != 0);
CHECK(radius_decrypt_user_password_attr(plain, 256, cipher, 17, ra, "xyzzy5461") != 0);