MD5,全稱為Message Digest Algorithm 5(訊息摘要演算法第五版).詳情請參考維基百科:MD5
MD5加密後是一個位元組數組, 但我們一般是取其十六進制的字符串表示法,當然,十六進制數字符串是區分大小寫,在mysql數據庫,Java,和JavaScript語言中,一般是使用小寫的字串來表示, 而在Oracle資料庫官方提供的包中,返回的是大寫字串,這算是一個坑,如果你想要執行多次md5,可能需要轉換為小寫.
相關的程式碼如下:
1. Java版MD5
MD5Util.java
package com.cncounter.util.common;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * Java訊息摘要演算法MD5 工具類別,其實其他摘要演算法的實作也類似*/public class MD5Util { / ** * 對文字執行md5 摘要加密, 此演算法與mysql,JavaScript產生的md5摘要進行過一致性比較. * @param plainText * @return 傳回值中的字母為小寫*/ public static String md5(String plainText) { if (null == plainText) { plainText = ""; } String MD5Str = ""; try { // JDK 6支援以下6種訊息摘要演算法，不區分大小寫// md5,sha(sha-1),md2,sha-256,sha-384,sha-512 MessageDigest md = MessageDigest.getInstance("MD5"); md.update(plainText.getBytes()); byte b[] = md.digest(); int i; StringBuilder builder = new StringBuilder(32); for (int offset = 0; offset < b.length; offset++) { i = b[offset]; if (i < 0) i += 256; if (i < 16) builder.append("0"); builder.append( Integer.toHexString(i)); } MD5Str = builder.toString(); // LogUtil.println("result: " + buf.toString());// 32位元的加密} catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return MD5Str; } // 一個簡版測試public static void main(String[] args) { String m1 = md5("1"); String m2 = md5(m1); /* 輸出為* m1=c4ca4238a0b923820dcc509a6f75849b * m2=28c8edde3d61a0411511d3b1866f0636 */ System.out.println("m1="+m1);2. MySQL版MD5
MySQL直接支援md5函數調用
select md5('1') as m1, md5(md5('1')) as m2;執行結果為:
MariaDB [(none)]> select md5('1') as m1, md5(md5('1')) as m2;+-------------------- --------------+------------------------------------------------+ | m1 | m2 |+----------------------------------+--------- -------------------------+| c4ca4238a0b923820dcc509a6f75849b | 28c8edde3d61a0411511d3b1866f0636 |+----------------------------------+------------ ----------------------+1 row in set (0.00 sec)3. JavaScript 版MD5函數
md5.js 程式碼如下:
/*! JavaScript 的MD5 實作*/// 括號表達式, (xxxxx) 是用來將內部的語句、表達式的結果作為一個結果.// 常見的是將json字串用eval 解析時,需要eval ("(" +jsonstr+ ")");// () 內部定義了一個空間, 裡面定義的變數不會污染到全域空間,很適合做lib// (function UMD(物件/函數名稱name,上下文this, 函數/物件的定義)) 傳回一個匿名函數// 因為第一個括號內的結果是一個函數,而函數可以這樣呼叫: (function(形參){})(實參);//這個匿名函式會被瀏覽器解析後會自動執行一次.(function UMD(name, context, definition) { if ( typeof module !== "undefined" && module.exports) { //如果module 存在,並且module.exports存在,則將賦值結果賦給它// 可以不用管module.exports = definition(); } else if ( typeof define === "function" && define.amd) { //如果define 這個函數存在,應該是另一個基礎類別庫，則使用define // 可以不用管define(definition); } else { // 簡單一點,可以看成:呼叫傳入的definition函數，將傳回的物件綁定到全域空間// 當然,根據傳入的上下文不同,也可以綁定到其他物件下面,成為一個屬性方法. context[name] = definition(name, context); }})("md5", this, function DEF(name, context) {"use strict"; // 上面的use strict 表示嚴格語法模式,有錯誤就拒絕執行. //而普通的JS,是解釋執行,不執行的地方,有些錯誤也不影響其他代碼的執行// 作為類庫,使用嚴格模式是很有必要的.嚴格模式聲明必須放到一個namespace空間的最起始處. // var old_public_api = (context || {})[name]; // 最後要回傳的物件/函數. function md5_func(text) { return hex_md5(text); }; // 下面一堆是具體的演算法...可以先不用管////////////////////////////////////////////// /////// //計算MD5 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)) }; func_utf8(a), str2rstr_utf8(b))) }; hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72" }; function rstr_md5(a) { return binl2rstr(binl_md5(rstrr2binl(a), amdle); 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 = 0; d++) { a = 0; d++) { a = .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)) }; ///////////////////////////////////////////// //////// // 避免全域命名空間衝突md5_func.noConflict = function publicAPI$noConflict() { if (context) { // 將那個name還原回原來的物件context[name] = old_public_api; } // 回傳自身,由呼叫的程式碼自己持有,保存,或賦值給某個變數return md5_func; }; // 傳回的物件,會被綁定到MD5 之類的名字上,在外部就引用了此物件, // 因為閉包特性,可以利用到閉包內部方法和內部物件。 lib一般都是利用這種閉包特性,維護私有的屬性、物件, // 對外只暴露一些方法(API),也就是function, 外面只能呼叫這些API,方便內部進行邏輯控制,降低依賴. return md5_func;})測試結果:
md5("1");"c4ca4238a0b923820dcc509a6f75849b"md5(md5("1"))"28c8edde3d61a0411511d3b1866f0636"4. Oracle 資料庫版MD5
注意: 為了與在其他環境下的MD5方法一致,需要轉換為小寫需要建立一個儲存函數:
CREATE OR REPLACE FUNCTION MD5(passwd IN VARCHAR2) RETURN VARCHAR2 IS retval varchar2(32);BEGIN retval := Lower(utl_raw.cast_to_raw(DBMS_OBFUSCATION_TOOLKIT.MD5(INPUT_STRING.INPUT_STRING);
測試結果:
SQL> select MD5('1') as m1, MD5(md5('1')) as m2 from dual 2 ;M1---------------------- -----------------M2-------------------------------- -------c4ca4238a0b923820dcc509a6f75849b28c8edde3d61a0411511d3b1866f0636PS：這裡再提供大家2款MD5加密工具，有興趣的朋友可以參考：
MD5線上加密工具：
http://tools.VeVB.COm/password/CreateMD5Password
線上MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.VeVB.COm/password/hash_md5_sha