public String hash(Map<String, ?> map) {
MessageDigest digest = HashUtil.createDigester();
List<String> keys = getSortedKeys(map);
for (String key : keys) {
Object value = getKeyValue(key, map);
appendObject(digest, key);
digest.update("=".getBytes());
appendObject(digest, value);
digest.update(",".getBytes());
}
return HashUtil.toHexString(digest.digest());
}
