content: package org.wechat.common.utils;
  
  /**
   * 
   * @author Andy
   *
   */
  public class SHA1 {
  	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
  	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
  	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 >> 8) & 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
  	private int byteArrayToInt(byte[] bytedata, int i) {
  		return ((bytedata[i] & 0xff) << 24) | ((bytedata[i + 1] & 0xff) << 16)
  				| ((bytedata[i + 2] & 0xff) << 8) | (bytedata[i + 3] & 0xff);
  	}
  
  	// 整数转换为4字节数组
  	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 >>> 8);
  		byteData[i + 3] = (byte) intValue;
  	}
  
  	// 将字节转换为十六进制字符串
  	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
  	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
  	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
  	public String getDigestOfString(byte[] byteData) {
  		return byteArrayToHexString(getDigestOfBytes(byteData));
  	}
  }
  