MD5密碼編譯演算法（java及js）

標籤：

為了防止使用者登陸過程中資訊被攔截導致資訊泄露，我們應該在用戶端就對使用者密碼進行加密。瀏覽器提交給伺服器的是加密後的資訊，即使被惡意攔截，被攔截資訊也已做了加密處理，現在比較安全的一種密碼編譯演算法是MD5密碼編譯演算法，儘管MD5是一種單向的密碼編譯演算法，但網上也有破解網站，所以為了進一步提高安全性，可以進行兩次md5加密，或者結合其他的加密方法如3des等進行二次加密。

代碼如下：

js版：

var hexcase = 0;function hex_md5(a) {if (a == "")return a;return rstr2hex(rstr_md5(str2rstr_utf8(a)))}function hex_hmac_md5(a, b) {return rstr2hex(rstr_hmac_md5(str2rstr_utf8(a), str2rstr_utf8(b)))}function md5_vm_test() {return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"}function rstr_md5(a) {return binl2rstr(binl_md5(rstr2binl(a), a.length * 8))}function rstr_hmac_md5(c, f) {var e = rstr2binl(c);if (e.length > 16) {e = binl_md5(e, c.length * 8)}var a = Array(16), d = Array(16);for ( var b = 0; b < 16; b++) {a[b] = e[b] ^ 909522486;d[b] = e[b] ^ 1549556828}var g = binl_md5(a.concat(rstr2binl(f)), 512 + f.length * 8);return binl2rstr(binl_md5(d.concat(g), 512 + 128))}function rstr2hex(c) {try {hexcase} catch (g) {hexcase = 0}var f = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";var b = "";var a;for ( var d = 0; d < c.length; d++) {a = c.charCodeAt(d);b += f.charAt((a >>> 4) & 15) + f.charAt(a & 15)}return b}function str2rstr_utf8(c) {var b = "";var d = -1;var a, e;while (++d < c.length) {a = c.charCodeAt(d);e = d + 1 < c.length ? c.charCodeAt(d + 1) : 0;if (55296 <= a && a <= 56319 && 56320 <= e && e <= 57343) {a = 65536 + ((a & 1023) << 10) + (e & 1023);d++}if (a <= 127) {b += String.fromCharCode(a)} else {if (a <= 2047) {b += String.fromCharCode(192 | ((a >>> 6) & 31), 128 | (a & 63))} else {if (a <= 65535) {b += String.fromCharCode(224 | ((a >>> 12) & 15),128 | ((a >>> 6) & 63), 128 | (a & 63))} else {if (a <= 2097151) {b += String.fromCharCode(240 | ((a >>> 18) & 7),128 | ((a >>> 12) & 63),128 | ((a >>> 6) & 63), 128 | (a & 63))}}}}}return b}function rstr2binl(b) {var a = Array(b.length >> 2);for ( var c = 0; c < a.length; c++) {a[c] = 0}for ( var c = 0; c < b.length * 8; c += 8) {a[c >> 5] |= (b.charCodeAt(c / 8) & 255) << (c % 32)}return a}function binl2rstr(b) {var a = "";for ( var c = 0; c < b.length * 32; c += 8) {a += String.fromCharCode((b[c >> 5] >>> (c % 32)) & 255)}return a}function binl_md5(p, k) {p[k >> 5] |= 128 << ((k) % 32);p[(((k + 64) >>> 9) << 4) + 14] = k;var o = 1732584193;var n = -271733879;var m = -1732584194;var l = 271733878;for ( var g = 0; g < p.length; g += 16) {var j = o;var h = n;var f = m;var e = l;o = md5_ff(o, n, m, l, p[g + 0], 7, -680876936);l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);o = md5_ff(o, n, m, l, p[g + 12], 7, 1804603682);l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);n = md5_gg(n, m, l, o, p[g + 12], 20, -1926607734);o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);m = md5_hh(m, l, o, n, p[g + 3], 16, -722521979);n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);l = md5_ii(l, o, n, m, p[g + 7], 10, 1126891415);m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);l = md5_ii(l, o, n, m, p[g + 3], 10, -1894986606);m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);o = safe_add(o, j);n = safe_add(n, h);m = safe_add(m, f);l = safe_add(l, e)}return Array(o, n, m, l)}function md5_cmn(h, e, d, c, g, f) {return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)}function md5_ff(g, f, k, j, e, i, h) {return md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)}function md5_gg(g, f, k, j, e, i, h) {return md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)}function md5_hh(g, f, k, j, e, i, h) {return md5_cmn(f ^ k ^ j, g, f, e, i, h)}function md5_ii(g, f, k, j, e, i, h) {return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)}function safe_add(a, d) {var c = (a & 65535) + (d & 65535);var b = (a >> 16) + (d >> 16) + (c >> 16);return (b << 16) | (c & 65535)}function bit_rol(a, b) {return (a << b) | (a >>> (32 - b))};

java版(代碼來源：http://www.cnblogs.com/computer-lzy/archive/2011/04/28/2031649.html)：

package md5;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/* * MD5 密碼編譯演算法*/public class MD5 {        // 全域數組    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5",            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };    public MD5() {    }    // 返回形式為數字跟字串    private static String byteToArrayString(byte bByte) {        int iRet = bByte;        // System.out.println("iRet="+iRet);        if (iRet < 0) {            iRet += 256;        }        int iD1 = iRet / 16;        int iD2 = iRet % 16;        return strDigits[iD1] + strDigits[iD2];    }    // 返回形式只為數字    private static String byteToNum(byte bByte) {        int iRet = bByte;        System.out.println("iRet1=" + iRet);        if (iRet < 0) {            iRet += 256;        }        return String.valueOf(iRet);    }    // 轉換位元組數組為16進位字串    private static String byteToString(byte[] bByte) {        StringBuffer sBuffer = new StringBuffer();        for (int i = 0; i < bByte.length; i++) {            sBuffer.append(byteToArrayString(bByte[i]));        }        return sBuffer.toString();    }    public static String GetMD5Code(String strObj) {        String resultString = null;        try {            resultString = new String(strObj);            MessageDigest md = MessageDigest.getInstance("MD5");            // md.digest() 該函數傳回值為存放雜湊值結果的byte數組            resultString = byteToString(md.digest(strObj.getBytes()));        } catch (NoSuchAlgorithmException ex) {            ex.printStackTrace();        }        return resultString;    }    public static void main(String[] args) {        MD5 getMD5 = new MD5();        System.out.println(getMD5.GetMD5Code(getMD5.GetMD5Code("aaaaaa")));    }}

MD5密碼編譯演算法（java及js）