SHA1Util

package com.kmt.cn;

import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1Util {

private final int[] abcde = { 0x67452301, 0xefcdab89, 0x98badcfe,
0x10325476, 0xc3d2e1f0 };

// 摘要数据存储数组
private int[] digestInt = new int[5];

// 计算过程中的临时数据存储数组
private int[] tmpData = new int[80];

/**
* 计算sha-1摘要
*
* @param bytedata
* @return
*/
private int process_input_bytes(byte[] bytedata) {
// 初试化常量
System.arraycopy(abcde, 0, digestInt, 0, abcde.length);
// 格式化输入字节数组，补10及长度数据
byte[] newbyte = byteArrayFormatData(bytedata);
// 获取数据摘要计算的数据单元个数
int MCount = newbyte.length / 64;
// 循环对每个数据单元进行摘要计算
for (int pos = 0; pos < MCount; pos++) {
// 将每个单元的数据转换成16个整型数据，并保存到tmpData的前16个数组元素中
for (int j = 0; j < 16; j++) {
tmpData[j] = byteArrayToInt(newbyte, (pos * 64) + (j * 4));
}
// 摘要计算函数
encrypt();
}
return 20;
}

/**
* 格式化输入字节数组格式
*
* @param bytedata
* @return
*/
private byte[] byteArrayFormatData(byte[] bytedata) {
// 补0数量
int zeros = 0;
// 补位后总位数
int size = 0;
// 原始数据长度
int n = bytedata.length;
// 模64后的剩余位数
int m = n % 64;
// 计算添加0的个数以及添加10后的总长度
if (m < 56) {
zeros = 55 - m;
size = n - m + 64;
} else if (m == 56) {
zeros = 63;
size = n + 8 + 64;
} else {
zeros = 63 - m + 56;
size = (n + 64) - m + 64;
}
// 补位后生成的新数组内容
byte[] newbyte = new byte[size];
// 复制数组的前面部分
System.arraycopy(bytedata, 0, newbyte, 0, n);
// 获得数组Append数据元素的位置
int l = n;
// 补1操作
newbyte[l++] = (byte) 0x80;
// 补0操作
for (int i = 0; i < zeros; i++) {
newbyte[l++] = (byte) 0x00;
}
// 计算数据长度，补数据长度位共8字节，长整型
long N = (long) n * 8;
byte h8 = (byte) (N & 0xFF);
byte h7 = (byte) ((N >> & 0xFF);
byte h6 = (byte) ((N >> 16) & 0xFF);
byte h5 = (byte) ((N >> 24) & 0xFF);
byte h4 = (byte) ((N >> 32) & 0xFF);
byte h3 = (byte) ((N >> 40) & 0xFF);
byte h2 = (byte) ((N >> 48) & 0xFF);
byte h1 = (byte) (N >> 56);
newbyte[l++] = h1;
newbyte[l++] = h2;
newbyte[l++] = h3;
newbyte[l++] = h4;
newbyte[l++] = h5;
newbyte[l++] = h6;
newbyte[l++] = h7;
newbyte[l++] = h8;
return newbyte;
}

private int f1(int x, int y, int z) {
return (x & y) | (~x & z);
}

private int f2(int x, int y, int z) {
return x ^ y ^ z;
}

private int f3(int x, int y, int z) {
return (x & y) | (x & z) | (y & z);
}

private int f4(int x, int y) {
return (x << y) | x >>> (32 - y);
}

/**
* 单元摘要计算函数
*/
private void encrypt() {
for (int i = 16; i <= 79; i++) {
tmpData[i] = f4(tmpData[i - 3] ^ tmpData[i - 8] ^ tmpData[i - 14]
^ tmpData[i - 16], 1);
}
int[] tmpabcde = new int[5];
for (int i1 = 0; i1 < tmpabcde.length; i1++) {
tmpabcde[i1] = digestInt[i1];
}
for (int j = 0; j <= 19; j++) {
int tmp = f4(tmpabcde[0], 5)
+ f1(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4]
+ tmpData[j] + 0x5a827999;
tmpabcde[4] = tmpabcde[3];
tmpabcde[3] = tmpabcde[2];
tmpabcde[2] = f4(tmpabcde[1], 30);
tmpabcde[1] = tmpabcde[0];
tmpabcde[0] = tmp;
}
for (int k = 20; k <= 39; k++) {
int tmp = f4(tmpabcde[0], 5)
+ f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4]
+ tmpData[k] + 0x6ed9eba1;
tmpabcde[4] = tmpabcde[3];
tmpabcde[3] = tmpabcde[2];
tmpabcde[2] = f4(tmpabcde[1], 30);
tmpabcde[1] = tmpabcde[0];
tmpabcde[0] = tmp;
}
for (int l = 40; l <= 59; l++) {
int tmp = f4(tmpabcde[0], 5)
+ f3(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4]
+ tmpData[l] + 0x8f1bbcdc;
tmpabcde[4] = tmpabcde[3];
tmpabcde[3] = tmpabcde[2];
tmpabcde[2] = f4(tmpabcde[1], 30);
tmpabcde[1] = tmpabcde[0];
tmpabcde[0] = tmp;
}
for (int m = 60; m <= 79; m++) {
int tmp = f4(tmpabcde[0], 5)
+ f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4]
+ tmpData[m] + 0xca62c1d6;
tmpabcde[4] = tmpabcde[3];
tmpabcde[3] = tmpabcde[2];
tmpabcde[2] = f4(tmpabcde[1], 30);
tmpabcde[1] = tmpabcde[0];
tmpabcde[0] = tmp;
}
for (int i2 = 0; i2 < tmpabcde.length; i2++) {
digestInt[i2] = digestInt[i2] + tmpabcde[i2];
}
for (int n = 0; n < tmpData.length; n++) {
tmpData[n] = 0;
}
}

/**
* 4字节数组转换为整数
*
* @param bytedata
* @param i
* @return
*/
private int byteArrayToInt(byte[] bytedata, int i) {
return ((bytedata[i] & 0xff) << 24) | ((bytedata[i + 1] & 0xff) << 16)
| ((bytedata[i + 2] & 0xff) << | (bytedata[i + 3] & 0xff);
}

//
/**
* 整数转换为4字节数组
*
* @param intValue
* @param byteData
* @param i
*/
private void intToByteArray(int intValue, byte[] byteData, int i) {
byteData[i] = (byte) (intValue >>> 24);
byteData[i + 1] = (byte) (intValue >>> 16);
byteData[i + 2] = (byte) (intValue >>> ;
byteData[i + 3] = (byte) intValue;
}

/**
* 将字节转换为十六进制字符串
*
* @param ib
* @return
*/
private static String byteToHexString(byte ib) {
char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
'B', 'C', 'D', 'E', 'F' };
char[] ob = new char[2];
ob[0] = Digit[(ib >>> 4) & 0X0F];
ob[1] = Digit[ib & 0X0F];
String s = new String(ob);
return s;
}

/**
* 将字节数组转换为十六进制字符串
*
* @param bytearray
* @return
*/
private static String byteArrayToHexString(byte[] bytearray) {
String strDigest = "";
for (int i = 0; i < bytearray.length; i++) {
strDigest += byteToHexString(bytearray[i]);
}
return strDigest;
}

/**
* 计算sha-1摘要，返回相应的字节数组
*
* @param byteData
* @return
*/
public byte[] getDigestOfBytes(byte[] byteData) {
process_input_bytes(byteData);
byte[] digest = new byte[20];
for (int i = 0; i < digestInt.length; i++) {
intToByteArray(digestInt[i], digest, i * 4);
}
return digest;
}

    /**
     * 计算sha-1摘要，返回相应的十六进制字符串
     *
     * @param byteData
     * @return
     */
    public String getDigestOfString(byte[] byteData) {
        return byteArrayToHexString(getDigestOfBytes(byteData));
    }

    /**
     * @param data
     * @return
     */
    public String Digest(String data){
    return this.getDigestOfString(data.getBytes());
    }

    /**
     * @param data
     * @return
     */
    public String Digest(String data,String encode){
    try {
return this.getDigestOfString(data.getBytes(encode));
} catch (UnsupportedEncodingException e) {
return this.Digest(data);
}
    }
   
    /**
     * @param text
     * @return
     */
    public static String SHA1Digest(String text) {
    String pwd = "";
try {
MessageDigest md = MessageDigest.getInstance("SHA1");
md.update(text.getBytes());
pwd = new BigInteger(1, md.digest()).toString(16);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
    return pwd;
    }
   
/**
* @param args
*/
public static void main(String[] args) {
SHA1Util sha1 = new SHA1Util();
// 0805949359741CE14FE90402B25E2E023F449748
System.out.println(sha1.Digest("我们","UTF-8"));
// 24E384109C1FE06E363DB1FF6C8F8DDBF18C45EA
System.out.println(sha1.Digest("我们"));
//System.out.println(MD5Encrypt.encryptMD5("我们"));

// 24e384109c1fe06e363db1ff6c8f8ddbf18c45ea
System.out.println(SHA1Util.SHA1Digest("我们"));
}

}