package cn.ksource.core.weixin;
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public class SHA1 {
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private final int[] abcde = {
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0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
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};
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// 摘要数据存储数组
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private int[] digestInt = new int[5];
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// 计算过程中的临时数据存储数组
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private int[] tmpData = new int[80];
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// 计算sha-1摘要
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private int process_input_bytes(byte[] bytedata) {
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// 初试化常量
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System.arraycopy(abcde, 0, digestInt, 0, abcde.length);
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// 格式化输入字节数组，补10及长度数据
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byte[] newbyte = byteArrayFormatData(bytedata);
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// 获取数据摘要计算的数据单元个数
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int MCount = newbyte.length / 64;
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// 循环对每个数据单元进行摘要计算
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for (int pos = 0; pos < MCount; pos++) {
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// 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
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for (int j = 0; j < 16; j++) {
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tmpData[j] = byteArrayToInt(newbyte, (pos * 64) + (j * 4));
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}
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// 摘要计算函数
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encrypt();
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}
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return 20;
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}
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// 格式化输入字节数组格式
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private byte[] byteArrayFormatData(byte[] bytedata) {
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// 补0数量
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int zeros = 0;
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// 补位后总位数
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int size = 0;
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// 原始数据长度
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int n = bytedata.length;
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// 模64后的剩余位数
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int m = n % 64;
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// 计算添加0的个数以及添加10后的总长度
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if (m < 56) {
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zeros = 55 - m;
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size = n - m + 64;
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} else if (m == 56) {
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zeros = 63;
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size = n + 8 + 64;
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} else {
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zeros = 63 - m + 56;
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size = (n + 64) - m + 64;
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}
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// 补位后生成的新数组内容
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byte[] newbyte = new byte[size];
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// 复制数组的前面部分
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System.arraycopy(bytedata, 0, newbyte, 0, n);
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// 获得数组Append数据元素的位置
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int l = n;
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// 补1操作
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newbyte[l++] = (byte) 0x80;
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// 补0操作
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for (int i = 0; i < zeros; i++) {
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newbyte[l++] = (byte) 0x00;
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}
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// 计算数据长度，补数据长度位共8字节，长整型
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long N = (long) n * 8;
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byte h8 = (byte) (N & 0xFF);
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byte h7 = (byte) ((N >> 8) & 0xFF);
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byte h6 = (byte) ((N >> 16) & 0xFF);
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byte h5 = (byte) ((N >> 24) & 0xFF);
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byte h4 = (byte) ((N >> 32) & 0xFF);
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byte h3 = (byte) ((N >> 40) & 0xFF);
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byte h2 = (byte) ((N >> 48) & 0xFF);
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byte h1 = (byte) (N >> 56);
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newbyte[l++] = h1;
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newbyte[l++] = h2;
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newbyte[l++] = h3;
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newbyte[l++] = h4;
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newbyte[l++] = h5;
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newbyte[l++] = h6;
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newbyte[l++] = h7;
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newbyte[l++] = h8;
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return newbyte;
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}
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private int f1(int x, int y, int z) {
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return (x & y) | (~x & z);
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}
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private int f2(int x, int y, int z) {
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return x ^ y ^ z;
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}
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private int f3(int x, int y, int z) {
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return (x & y) | (x & z) | (y & z);
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}
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private int f4(int x, int y) {
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return (x << y) | x >>> (32 - y);
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}
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// 单元摘要计算函数
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private void encrypt() {
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for (int i = 16; i <= 79; i++) {
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tmpData[i] = f4(tmpData[i - 3] ^ tmpData[i - 8] ^ tmpData[i - 14] ^
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tmpData[i - 16], 1);
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}
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int[] tmpabcde = new int[5];
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for (int i1 = 0; i1 < tmpabcde.length; i1++) {
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tmpabcde[i1] = digestInt[i1];
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}
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for (int j = 0; j <= 19; j++) {
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int tmp = f4(tmpabcde[0], 5) +
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f1(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +
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tmpData[j] + 0x5a827999;
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tmpabcde[4] = tmpabcde[3];
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tmpabcde[3] = tmpabcde[2];
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tmpabcde[2] = f4(tmpabcde[1], 30);
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tmpabcde[1] = tmpabcde[0];
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tmpabcde[0] = tmp;
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}
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for (int k = 20; k <= 39; k++) {
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int tmp = f4(tmpabcde[0], 5) +
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f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +
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tmpData[k] + 0x6ed9eba1;
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tmpabcde[4] = tmpabcde[3];
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tmpabcde[3] = tmpabcde[2];
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tmpabcde[2] = f4(tmpabcde[1], 30);
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tmpabcde[1] = tmpabcde[0];
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tmpabcde[0] = tmp;
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}
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for (int l = 40; l <= 59; l++) {
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int tmp = f4(tmpabcde[0], 5) +
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f3(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +
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tmpData[l] + 0x8f1bbcdc;
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tmpabcde[4] = tmpabcde[3];
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tmpabcde[3] = tmpabcde[2];
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tmpabcde[2] = f4(tmpabcde[1], 30);
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tmpabcde[1] = tmpabcde[0];
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tmpabcde[0] = tmp;
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}
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for (int m = 60; m <= 79; m++) {
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int tmp = f4(tmpabcde[0], 5) +
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f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +
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tmpData[m] + 0xca62c1d6;
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tmpabcde[4] = tmpabcde[3];
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tmpabcde[3] = tmpabcde[2];
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tmpabcde[2] = f4(tmpabcde[1], 30);
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tmpabcde[1] = tmpabcde[0];
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tmpabcde[0] = tmp;
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}
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for (int i2 = 0; i2 < tmpabcde.length; i2++) {
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digestInt[i2] = digestInt[i2] + tmpabcde[i2];
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}
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for (int n = 0; n < tmpData.length; n++) {
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tmpData[n] = 0;
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}
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}
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// 4字节数组转换为整数
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private int byteArrayToInt(byte[] bytedata, int i) {
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return ((bytedata[i] & 0xff) << 24) | ((bytedata[i + 1] & 0xff) << 16) |
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((bytedata[i + 2] & 0xff) << 8) | (bytedata[i + 3] & 0xff);
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}
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// 整数转换为4字节数组
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private void intToByteArray(int intValue, byte[] byteData, int i) {
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byteData[i] = (byte) (intValue >>> 24);
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byteData[i + 1] = (byte) (intValue >>> 16);
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byteData[i + 2] = (byte) (intValue >>> 8);
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byteData[i + 3] = (byte) intValue;
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}
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// 将字节转换为十六进制字符串
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private static String byteToHexString(byte ib) {
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char[] Digit = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
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'D', 'E', 'F'
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};
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char[] ob = new char[2];
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ob[0] = Digit[(ib >>> 4) & 0X0F];
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ob[1] = Digit[ib & 0X0F];
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String s = new String(ob);
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return s;
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}
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// 将字节数组转换为十六进制字符串
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private static String byteArrayToHexString(byte[] bytearray) {
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String strDigest = "";
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for (int i = 0; i < bytearray.length; i++) {
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strDigest += byteToHexString(bytearray[i]);
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}
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return strDigest;
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}
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// 计算sha-1摘要，返回相应的字节数组
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public byte[] getDigestOfBytes(byte[] byteData) {
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process_input_bytes(byteData);
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byte[] digest = new byte[20];
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for (int i = 0; i < digestInt.length; i++) {
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intToByteArray(digestInt[i], digest, i * 4);
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}
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return digest;
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}
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// 计算sha-1摘要，返回相应的十六进制字符串
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public String getDigestOfString(byte[] byteData) {
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return byteArrayToHexString(getDigestOfBytes(byteData));
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}
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public static void main(String[] args) {
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String data = "123456";
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System.out.println(data);
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String digest = new SHA1().getDigestOfString(data.getBytes());
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System.out.println(digest);
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// System.out.println( ToMD5.convertSHA1(data).toUpperCase());
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}
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}
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