123 lines
2.8 KiB
Java
123 lines
2.8 KiB
Java
/**
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* Copyright (c) 2005-2012 springside.org.cn
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*/
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package com.nis.util;
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import java.io.IOException;
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import java.io.InputStream;
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import java.security.GeneralSecurityException;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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import org.apache.commons.lang3.Validate;
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/**
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* 支持SHA-1/MD5消息摘要的工具类.
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*
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* 返回ByteSource，可进一步被编码为Hex, Base64或UrlSafeBase64
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*
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* @author calvin
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*/
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public class Digests {
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private static final String SHA1 = "SHA-1";
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private static final String MD5 = "MD5";
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private static SecureRandom random = new SecureRandom();
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/**
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* 对输入字符串进行md5散列.
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*/
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public static byte[] md5(byte[] input) {
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return digest(input, MD5, null, 1);
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}
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public static byte[] md5(byte[] input, int iterations) {
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return digest(input, MD5, null, iterations);
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}
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/**
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* 对输入字符串进行sha1散列.
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*/
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public static byte[] sha1(byte[] input) {
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return digest(input, SHA1, null, 1);
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}
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public static byte[] sha1(byte[] input, byte[] salt) {
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return digest(input, SHA1, salt, 1);
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}
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public static byte[] sha1(byte[] input, byte[] salt, int iterations) {
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return digest(input, SHA1, salt, iterations);
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}
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/**
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* 对字符串进行散列, 支持md5与sha1算法.
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*/
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private static byte[] digest(byte[] input, String algorithm, byte[] salt, int iterations) {
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try {
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MessageDigest digest = MessageDigest.getInstance(algorithm);
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if (salt != null) {
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digest.update(salt);
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}
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byte[] result = digest.digest(input);
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for (int i = 1; i < iterations; i++) {
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digest.reset();
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result = digest.digest(result);
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}
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return result;
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 生成随机的Byte[]作为salt.
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*
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* @param numBytes byte数组的大小
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*/
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public static byte[] generateSalt(int numBytes) {
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Validate.isTrue(numBytes > 0, "numBytes argument must be a positive integer (1 or larger)", numBytes);
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byte[] bytes = new byte[numBytes];
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random.nextBytes(bytes);
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return bytes;
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}
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/**
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* 对文件进行md5散列.
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*/
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public static byte[] md5(InputStream input) throws IOException {
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return digest(input, MD5);
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}
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/**
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* 对文件进行sha1散列.
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*/
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public static byte[] sha1(InputStream input) throws IOException {
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return digest(input, SHA1);
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}
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private static byte[] digest(InputStream input, String algorithm) throws IOException {
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try {
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MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
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int bufferLength = 8 * 1024;
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byte[] buffer = new byte[bufferLength];
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int read = input.read(buffer, 0, bufferLength);
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while (read > -1) {
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messageDigest.update(buffer, 0, read);
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read = input.read(buffer, 0, bufferLength);
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}
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return messageDigest.digest();
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} catch (GeneralSecurityException e) {
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throw Exceptions.unchecked(e);
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}
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}
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}
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