string sha1 Hash - Java Security

Description

string sha1 Hash
Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String s = "java2s.com";
        System.out.println(str_sha1(s));
    }//from www . ja  va2s .co  m

    private static final int chrsz = 8;

    public static String str_sha1(String s) {
        s = (s == null) ? "" : s;

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

    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[] 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 = strechbinarray(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 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;
    }

    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;
    }
}
string sha1 Hash - Java Security

Description

Demo Code

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