SHA1加密工具类

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import java.io.UnsupportedEncodingException;import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException; 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     *      * @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 >> 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     *      * @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) << 8) | (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 >>> 8);        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) {        SHA1 sha1 = new SHA1();        // 0805949359741CE14FE90402B25E2E023F449748        System.out.println(sha1.Digest("我们","UTF-8"));        // 24E384109C1FE06E363DB1FF6C8F8DDBF18C45EA        System.out.println(sha1.Digest("我们"));                 // 24e384109c1fe06e363db1ff6c8f8ddbf18c45ea        System.out.println(SHA1.SHA1Digest("我们"));    }}
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