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/**
 * Copyright (c) 2011-2023, James Zhan 詹波 ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jfinal.kit;

import java.security.MessageDigest;
import java.util.concurrent.ThreadLocalRandom;

public class HashKit {
	
	public static final long FNV_OFFSET_BASIS_64 = 0xcbf29ce484222325L;
	public static final long FNV_PRIME_64 = 0x100000001b3L;
	
	// private static final java.security.SecureRandom random = new java.security.SecureRandom();
	private static final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();
	private static final char[] CHAR_ARRAY = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
	
	public static long fnv1a64(String key) {
		long hash = FNV_OFFSET_BASIS_64;
		for(int i=0, size=key.length(); i> 4) & 0x0f]);
			ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
		}
		return ret.toString();
	}
	
	/**
	 * md5 128bit 16bytes
	 * sha1 160bit 20bytes
	 * sha256 256bit 32bytes
	 * sha384 384bit 48bytes
	 * sha512 512bit 64bytes
	 */
	public static String generateSalt(int saltLength) {
		StringBuilder salt = new StringBuilder(saltLength);
		ThreadLocalRandom random = ThreadLocalRandom.current();
		for (int i=0; i