Java实现SHA

Java实现SHA

本文实例讲述了java实现SHA-1算法的方法。分享给大家供大家参考。具体实现方法如下：

复制代码 代码如下:

public class SHA1Util {

    private static final boolean hexcase = false;

    private static final String b64pad = "=";

    private static final int chrsz = 8;

    // 得到字符串SHA-1值的方法

    public static String hex_sha1(String s) {

        s = (s == null) ? "" : s;

        return binb2hex(core_sha1(str2binb(s), s.length() * chrsz));

    }

    public static String b64_hmac_sha1(String key, String data) {

        return binb2b64(core_hmac_sha1(key, datahttp://));

    }

    public static String b64_sha1(String s) {

        s = (s == null) ? "" : s;

        return binb2b64(core_sha1(str2binb(s), s.length() * chrsz));

    }

    private static String binb2b64(int[] binarray) {

        String tab = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";

        String str = "";

        binarray = strechbinarray(binarray, binarray.length * 4);

        for (int i = 0; i < binarray.length * 4; i += 3) {

            int triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xff) << 16)

                    | (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xff) << 8)

                    | ((binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4)) & 0xff);

            for (int j = 0; j < 4; j++) {

                if (i * 8 + j * 6 > binarray.length * 32) {

                    str += b64pad;

                } else {

                    str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3f);

                }

            }

        }

        return cleanb64str(str);

    }

    private static String binb2hex(int[] binarray) {

        String hex_tab = hexcase ? "0123456789abcdef" : "0123456789abcdef";

        String str = "";

        for (int i = 0; i < binarray.length * 4; i++) {

            char a = (char) hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xf);

            char b = (char) hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xf);

            str += (new Character(a).toString() + new Character(b).toString());

        }

        return str;

    }

    private static String binb2str(int[] bin) {

        String str = "";

        int mask = (1 << chrsz) - 1;

        for (int i = 0; i < bin.length * 32; i += chrsz) {

            str += (char) ((bin[i >> 5] >>> (24 - i % 32)) & mask);

        }

        return str;

    }

    private static int bit_rol(int num, int cnt) {

        return (num << cnt) | (num >>> (32 - cnt));

    }

    private static String cleanb64str(String str) {

        str = (str == null) ? "" : str;

        int len = str.length();

        if (len <= 1) {

            return str;

        }

        char trailchar = str.charAt(len - 1);

        String trailstr = "";

        for (int i = len - 1; i >= 0 && str.charAt(i) == trailchar; i--) {

            trailstr += str.charAt(i);

        }

        return str.substring(0, str.indexOf(trailstr));

    }

    private static int[] complete216(int[] oldbin) {

        if (oldbin.length >= 16) {

            return oldbin;

        }

        int[] newbin = new int[16 - oldbin.length];

        for (int i = 0; i < newbin.length; newbin[i] = 0, i++)

            ;

        return concat(oldbin, newbin);

    }

    private static int[] concat(int[] oldbin, int[] newbin) {

        int[] retval = new int[oldbin.length + newbin.length];

        for (int i = 0; i < (oldbin.length + newbin.length); i++) {

            if (i < oldbin.length) {

                retval[i] = oldbin[i];

            } else {

                retval[i] = newbin[i - oldbin.length];

            }

        }

        return retval;

    }

    private static int[] core_hmac_sha1(String key, String data) {

        key = (key == null) ? "" : key;

        data = (data == null) ? "" : data;

        int[] bkey = complete216(str2binb(key));

        if (bkey.length > 16) {

            bkey = core_sha1(bkey, key.length() * chrsz);

        }

        int[] ipad = new int[16];

        int[] opad = new int[16];

        for (int i = 0; i < 16; ipad[i] = 0, opad[i] = 0, i++)

            ;

        for (int i = 0; i < 16; i++) {

            ipad[i] = bkey[i] ^ 0x36363636;

            opad[i] = bkey[i] ^ 0x5c5c5c5c;

        }

        int[] hash = core_sha1(concat(ipad, str2binb(data)), 512 + data.length() * chrsz);

        return core_sha1(concat(opad, hash), 512 + 160);

    }

    private static int[] core_sha1(int[] x, int len) {

        int size = (len >> 5);

        x = strechbinarray(x, size);

        x[len >> 5] |= 0x80 << (24 - len % 32);

        size = ((len + 64 >> 9) << 4) + 15;

        x = strechbinaSirTNSKArray(x, size);

        x[((len + 64 >> 9) << 4) + 15] = len;

        int[] w = new int[80];

        int a = 1732584193;

        int b = -271733879;

        int c = -1732584194;

        int d = 271733878;

        int e = -1009589776;

        for (int i = 0; i < x.length; i += 16) {

            int olda = a;

            int oldb = b;

            int oldc = c;

            int oldd = d;

            int olde = e;

            for (int j = 0; j < 80; j++) {

                if (j < 16) {

                    w[j] = x[i + j];

                } else {

                    w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);

                }

                int t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));

                e = d;

                d = c;

                c = rol(b, 30);

                b = a;

                a = t;

            }

            a = safe_add(a, olda);

            b = safe_add(b, oldb);

            c = safe_add(c, oldc);

            d = safe_add(d, oldd);

            e = safe_add(e, olde);

        }

        int[] retval = new int[5];

        retval[0] = a;

        retval[1] = b;

        retval[2] = c;

        retval[3] = d;

        retval[4] = e;

        return retval;

    }

    private static void dotest() {

        String key = "key";

        String data = "data";

        System.out.println("hex_sha1(" + data + ")=" + hex_sha1(data));

        System.out.println("b64_sha1(" + data + ")=" + b64_sha1(data));

        System.out.println("str_sha1(" + data + ")=" + str_sha1(data));

        System.out.println("hex_hmac_sha1(" + key + "," + data + ")=" + hex_hmac_sha1(key, data));

        System.out.println("b64_hmac_sha1(" + key + "," + data + ")=" + b64_hmac_sha1(key, data));

        System.out.println("str_hmac_sha1(" + key + "," + data + ")=" + str_hmac_sha1(key, data));

    }

    public static String hex_hmac_sha1(String key, String data) {

        return binb2hex(core_hmac_sha1(key, data));

    }

    private static int rol(int num, int cnt) {

        return (num << cnt) | (num >>> (32 - cnt));

    }

    private static int safe_add(int x, int y) {

        int lsw = (int) (x & 0xffff) + (int) (y & 0xffff);

        int msw = (x >> 16) + (y >> 16) + (lsw >> 16);

        return (msw << 16) | (lsw & 0xffff);

    }

    private static int sha1_ft(int t, int b, int c, int d) {

        if (t < 20)

            return (b & c) | ((~b) & d);

        if (t < 40)

            return b ^ c ^ d;

        if (t < 60)

            return (b & c) | (b & d) | (c & d);

        return b ^ c ^ d;

    }

    private static int sha1_kt(int t) {

        return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;

    }

    private static boolean sha1_vm_test() {

        return hexcase ? hex_sha1("abc").equals("a9993e364706816aba3e25717850c26c9cd0d89d") : hex_sha1("abc").equals(

                "a9993e364706816aba3e25717850c26c9cd0d89d");

    }

    public static String str_hmac_sha1(String key, String data) {

        return binb2str(core_hmac_sha1(key, data));

    }

    public static String str_sha1(String s) {

        s = (s == null) ? "" : s;

        return binb2str(core_sha1(str2binb(s), s.length() * chrsz));

    }

    private static int[] str2binb(String str) {

        str = (str == null) ? "" : str;

        int[] tmp = new int[str.length() * chrsz];

        int mask = (1 << chrsz) - 1;

        for (int i = 0; i < str.length() * chrsz; i += chrsz) {

            tmp[i >> 5] |= ((int) (str.charAt(i / chrsz)) & mask) << (24 - i % 32);

        }

        int len = 0;

        for (int i = 0; i < tmp.length && tmp[i] != 0; i++, len++)

            ;

        int[] bin = new int[len];

        for (int i = 0; i < len; i++) {

            bin[i] = tmp[i];

        }

        return bin;

    }

    private static int[] strechbinarray(int[] oldbin, int size) {

        int currlen = oldbin.length;

        if (currlen >= size + 1) {

            return oldbin;

        }

        int[] newbin = new int[size + 1];

        for (int i = 0; i < size; newbin[i] = 0, i++)

            ;

        for (int i = 0; i < currlen; i++) {

            newbin[i] = oldbin[i];

        }

        return newbin;

    }

&nSirTNSKAbsp;   public static void main(String args[]) {

        System.out.println("admin的SHA1的值为：" + hex_sha1("admin") + ",length=" + hex_sha1("admin").length());

    }

}

希望本文所述对大家的java程序设计有所帮助。

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