在JSP中如何實(shí)現(xiàn)MD5加密的方法
在各種應(yīng)用系統(tǒng)的開發(fā)中,經(jīng)常需要存儲(chǔ)用戶信息,很多地方都要存儲(chǔ)用戶密碼,而將用戶密碼直接存儲(chǔ)在服務(wù)器上顯然是不安全的,本文簡(jiǎn)要介紹在JSP中如何實(shí)現(xiàn)MD5加密的方法,希望能拋磚引玉。
(一)消息摘要簡(jiǎn)介
一個(gè)消息摘要就是一個(gè)數(shù)據(jù)塊的數(shù)字指紋。即對(duì)一個(gè)任意長(zhǎng)度的一個(gè)數(shù)據(jù)塊進(jìn)行計(jì)算,產(chǎn)生一個(gè)唯一指?。▽?duì)于SHA1是產(chǎn)生一個(gè)20字節(jié)的二進(jìn)制數(shù)組)。消息摘要是一種與消息認(rèn)證碼結(jié)合使用以確保消息完整性的技術(shù)。主要使用單向散列函數(shù)算法,可用于檢驗(yàn)消息的完整性,和通過(guò)散列密碼直接以文本形式保存等,目前廣泛使用的算法有MD4、MD5、SHA-1。
消息摘要有兩個(gè)基本屬性:
兩個(gè)不同的報(bào)文難以生成相同的摘要
難以對(duì)指定的摘要生成一個(gè)報(bào)文,而可以由該報(bào)文反推算出該指定的摘要。
Java源碼
import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class MD5Digest { private MessageDigest __md5 = null; private StringBuffer __digestBuffer = null; public MD5Digest() throws NoSuchAlgorithmException { __md5 = MessageDigest.getInstance("MD5"); __digestBuffer = new StringBuffer(); } public String md5crypt(String s) { __digestBuffer.setLength(0); byte abyte0[] = __md5.digest(s.getBytes()); for(int i = 0; i < abyte0.length; i++) __digestBuffer.append(toHex(abyte0[i])); return __digestBuffer.toString(); } public String toHex(byte one){ String HEX="0123456789ABCDEF"; char[] result=new char[2]; result[0]=HEX.charAt((one & 0xf0) >> 4); result[1]=HEX.charAt(one & 0x0f); String mm=new String(result); return mm; } }
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/************************************************ MD5 算法的Java Bean @author:Topcat Tuppin Last Modified:10,Mar,2001 *************************************************/ package beartool; import java.lang.reflect.*; /************************************************* md5 類實(shí)現(xiàn)了RSA Data Security, Inc.在提交給IETF 的RFC1321中的MD5 message-digest 算法。 *************************************************/ public class MD5 { /* 下面這些S11-S44實(shí)際上是一個(gè)4*4的矩陣,在原始的C實(shí)現(xiàn)中是用#define 實(shí)現(xiàn)的, 這里把它們實(shí)現(xiàn)成為static final是表示了只讀,切能在同一個(gè)進(jìn)程空間內(nèi)的多個(gè) Instance間共享*/ static final int S11 = 7; static final int S12 = 12; static final int S13 = 17; static final int S14 = 22; static final int S21 = 5; static final int S22 = 9; static final int S23 = 14; static final int S24 = 20; static final int S31 = 4; static final int S32 = 11; static final int S33 = 16; static final int S34 = 23; static final int S41 = 6; static final int S42 = 10; static final int S43 = 15; static final int S44 = 21; static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; /* 下面的三個(gè)成員是MD5計(jì)算過(guò)程中用到的3個(gè)核心數(shù)據(jù),在原始的C實(shí)現(xiàn)中 被定義到MD5_CTX結(jié)構(gòu)中 */ private long[] state = new long[4];// state (ABCD) private long[] count = new long[2];// number of bits, modulo 2^64 (lsb first) private byte[] buffer = new byte[64]; // input buffer /* digestHexStr是MD5的唯一一個(gè)公共成員,是最新一次計(jì)算結(jié)果的 16進(jìn)制ASCII表示. */ public String digestHexStr; /* digest,是最新一次計(jì)算結(jié)果的2進(jìn)制內(nèi)部表示,表示128bit的MD5值. */ private byte[] digest = new byte[16]; /* getMD5ofStr是類MD5最主要的公共方法,入口參數(shù)是你想要進(jìn)行MD5變換的字符串 返回的是變換完的結(jié)果,這個(gè)結(jié)果是從公共成員digestHexStr取得的. */ public String getMD5ofStr(String inbuf) { md5Init(); md5Update(inbuf.getBytes(), inbuf.length()); md5Final(); digestHexStr = ""; for (int i = 0; i < 16; i++) { digestHexStr += byteHEX(digest[i]); } return digestHexStr; } // 這是MD5這個(gè)類的標(biāo)準(zhǔn)構(gòu)造函數(shù),JavaBean要求有一個(gè)public的并且沒(méi)有參數(shù)的構(gòu)造函數(shù) public MD5() { md5Init(); return; } /* md5Init是一個(gè)初始化函數(shù),初始化核心變量,裝入標(biāo)準(zhǔn)的幻數(shù) */ private void md5Init() { count[0] = 0L; count[1] = 0L; ///* Load magic initialization constants. state[0] = 0x67452301L; state[1] = 0xefcdab89L; state[2] = 0x98badcfeL; state[3] = 0x10325476L; return; } /* F, G, H ,I 是4個(gè)基本的MD5函數(shù),在原始的MD5的C實(shí)現(xiàn)中,由于它們是 簡(jiǎn)單的位運(yùn)算,可能出于效率的考慮把它們實(shí)現(xiàn)成了宏,在java中,我們把它們 實(shí)現(xiàn)成了private方法,名字保持了原來(lái)C中的。 */ private long F(long x, long y, long z) { return (x & y) | ((~x) & z); } private long G(long x, long y, long z) { return (x & z) | (y & (~z)); } private long H(long x, long y, long z) { return x ^ y ^ z; } private long I(long x, long y, long z) { return y ^ (x | (~z)); } /* FF,GG,HH和II將調(diào)用F,G,H,I進(jìn)行近一步變換 FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */ private long FF(long a, long b, long c, long d, long x, long s, long ac) { a += F (b, c, d) + x + ac; a = ((int) a << s) | ((int) a >>> (32 - s)); a += b; return a; } private long GG(long a, long b, long c, long d, long x, long s, long ac) { a += G (b, c, d) + x + ac; a = ((int) a << s) | ((int) a >>> (32 - s)); a += b; return a; } private long HH(long a, long b, long c, long d, long x, long s, long ac) { a += H (b, c, d) + x + ac; a = ((int) a << s) | ((int) a >>> (32 - s)); a += b; return a; } private long II(long a, long b, long c, long d, long x, long s, long ac) { a += I (b, c, d) + x + ac; a = ((int) a << s) | ((int) a >>> (32 - s)); a += b; return a; } /* md5Update是MD5的主計(jì)算過(guò)程,inbuf是要變換的字節(jié)串,inputlen是長(zhǎng)度,這個(gè) 函數(shù)由getMD5ofStr調(diào)用,調(diào)用之前需要調(diào)用md5init,因此把它設(shè)計(jì)成private的 */ private void md5Update(byte[] inbuf, int inputLen) { int i, index, partLen; byte[] block = new byte[64]; index = (int)(count[0] >>> 3) & 0x3F; // /* Update number of bits */ if ((count[0] += (inputLen << 3)) < (inputLen << 3)) count[1]++; count[1] += (inputLen >>> 29); partLen = 64 - index; // Transform as many times as possible. if (inputLen >= partLen) { md5Memcpy(buffer, inbuf, index, 0, partLen); md5Transform(buffer); for (i = partLen; i + 63 < inputLen; i += 64) { md5Memcpy(block, inbuf, 0, i, 64); md5Transform (block); } index = 0; } else i = 0; ///* Buffer remaining input */ md5Memcpy(buffer, inbuf, index, i, inputLen - i); } /* md5Final整理和填寫輸出結(jié)果 */ private void md5Final () { byte[] bits = new byte[8]; int index, padLen; ///* Save number of bits */ Encode (bits, count, 8); ///* Pad out to 56 mod 64. index = (int)(count[0] >>> 3) & 0x3f; padLen = (index < 56) ? (56 - index) : (120 - index); md5Update (PADDING, padLen); ///* Append length (before padding) */ md5Update(bits, 8); ///* Store state in digest */ Encode (digest, state, 16); } /* md5Memcpy是一個(gè)內(nèi)部使用的byte數(shù)組的塊拷貝函數(shù),從input的inpos開始把len長(zhǎng)度的 字節(jié)拷貝到output的outpos位置開始 */ private void md5Memcpy (byte[] output, byte[] input, int outpos, int inpos, int len) { int i; for (i = 0; i < len; i++) output[outpos + i] = input[inpos + i]; } /* md5Transform是MD5核心變換程序,有md5Update調(diào)用,block是分塊的原始字節(jié) */ private void md5Transform (byte block[]) { long a = state[0], b = state[1], c = state[2], d = state[3]; long[] x = new long[16]; Decode (x, block, 64); /* Round 1 */ a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */ d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */ c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */ b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */ a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */ d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */ c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */ b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */ a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */ d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */ c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */ b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */ a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */ d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */ c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */ b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */ /* Round 2 */ a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */ d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */ c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */ b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */ a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */ d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */ c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */ b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */ a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */ d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */ c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */ b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */ a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */ d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */ c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */ b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */ /* Round 3 */ a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */ d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */ c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */ b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */ a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */ d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */ c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */ b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */ a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */ d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */ c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */ b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */ a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */ d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */ c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */ b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */ /* Round 4 */ a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */ d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */ c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */ b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */ a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */ d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */ c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */ b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */ a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */ d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */ c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */ b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */ a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */ d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */ c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */ b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; } /*Encode把long數(shù)組按順序拆成byte數(shù)組,因?yàn)閖ava的long類型是64bit的, 只拆低32bit,以適應(yīng)原始C實(shí)現(xiàn)的用途 */ private void Encode (byte[] output, long[] input, int len) { int i, j; for (i = 0, j = 0; j < len; i++, j += 4) { output[j] = (byte)(input[i] & 0xffL); output[j + 1] = (byte)((input[i] >>> 8) & 0xffL); output[j + 2] = (byte)((input[i] >>> 16) & 0xffL); output[j + 3] = (byte)((input[i] >>> 24) & 0xffL); } } /*Decode把byte數(shù)組按順序合成成long數(shù)組,因?yàn)閖ava的long類型是64bit的, 只合成低32bit,高32bit清零,以適應(yīng)原始C實(shí)現(xiàn)的用途 */ private void Decode (long[] output, byte[] input, int len) { int i, j; for (i = 0, j = 0; j < len; i++, j += 4) output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8) | (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24); return; } /* b2iu是我寫的一個(gè)把byte按照不考慮正負(fù)號(hào)的原則的"升位"程序,因?yàn)閖ava沒(méi)有unsigned運(yùn)算 */ public static long b2iu(byte b) { return b < 0 ? b & 0x7F + 128 : b; } /*byteHEX(),用來(lái)把一個(gè)byte類型的數(shù)轉(zhuǎn)換成十六進(jìn)制的ASCII表示, 因?yàn)閖ava中的byte的toString無(wú)法實(shí)現(xiàn)這一點(diǎn),我們又沒(méi)有C語(yǔ)言中的 sprintf(outbuf,"%02X",ib) */ public static String byteHEX(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; } public static void main(String args[]) { MD5 m = new MD5(); if (Array.getLength(args) == 0) {//如果沒(méi)有參數(shù),執(zhí)行標(biāo)準(zhǔn)的Test Suite System.out.println("MD5 Test suite:"); System.out.println("MD5(\"\"):"+m.getMD5ofStr("")); System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a")); System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc")); System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest")); System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+ m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz")); System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+ m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")); } else System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0])); } }
JSP中的使用方法
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<%@ page language='java' %> <jsp:useBean id='oMD5' scope='request' class='beartool.MD5'/> <%@ page import='java.util.*'%> <%@ page import='java.sql.*'%> <html> <body> <% String userid = request.getParameter("UserID");//獲取用戶輸入U(xiǎn)serID String password = request.getParameter("Password"); //獲取用戶輸入的Password String pwdmd5 = oMD5.getMD5ofStr(password);//計(jì)算MD5的值 PrintWriter rp = response.getWriter(); Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection("jdbc:odbc:community", "", ""); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery("select * from users where userID ='"+userid+"' and pwdmd5= '" + pwdmd5+"'" ); if (rs.next()) { rp.print("Login OK"); } else { rp.print("Login Fail"); } stmt.close(); con.close(); %> </body> </html>
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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用js實(shí)現(xiàn)的替換除數(shù)字與逗號(hào)以外的所有字符的代碼,因?yàn)樾枰コ貜?fù),這樣的話就會(huì)有很多的逗號(hào)需要替換2014-06-06js輸出數(shù)據(jù)精確到小數(shù)點(diǎn)后n位代碼
要保留小數(shù)點(diǎn)后N位的問(wèn)題,經(jīng)過(guò)一番思索,終于解決了,這篇文章主要介紹了js輸出數(shù)據(jù)精確到小數(shù)點(diǎn)后n位代碼,感興趣的朋友可以參考一下2016-07-07