fuint-framework/fuint-util/src/main/java/com/fuint/util/Digests.java

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package com.fuint.util;

import com.fuint.exception.Exceptions;
import org.apache.commons.lang3.Validate;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.SecureRandom;

/**
 * 支持SHA-1/MD5消息摘要的工具类.
 * 
 * 返回ByteSource，可进一步被编码为Hex, Base64或UrlSafeBase64
 * 
 * @author fsq
 * @version $Id: Digests.java
 */
public class Digests {

    private static final String SHA1 = "SHA-1";
    private static final String MD5  = "MD5";

    private static SecureRandom random = new SecureRandom();

    /**
     * 对输入字符串进行sha1散列.
     */
    public static byte[] sha1(byte[] input) {
        return digest(input, SHA1, null, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt) {
        return digest(input, SHA1, salt, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt, int iterations) {
        return digest(input, SHA1, salt, iterations);
    }

    /**
     * 对字符串进行散列, 支持md5与sha1算法.
     */
    private static byte[] digest(byte[] input, String algorithm, byte[] salt, int iterations) {
        try {
            MessageDigest digest = MessageDigest.getInstance(algorithm);

            if (salt != null) {
                digest.update(salt);
            }

            byte[] result = digest.digest(input);

            for (int i = 1; i < iterations; i++) {
                digest.reset();
                result = digest.digest(result);
            }
            return result;
        } catch (GeneralSecurityException e) {
            throw Exceptions.unchecked(e);