参数签名实例（md5实现 数据完整性）
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在前端用js定义md5函数对值做哈希，如此用户提交表单后，在网络中路由间传递的便是简单加密后的信息，而非明文信息，等表单提交到后台后，可用md5再次对其进行加密，再行存储。亦或者防止有人截取报文修改客户端提交过来的参数进行越权查看，我们可以对参数进行md5加密进行处理，与请求参数一起传递到服务器，服务器对接收到的参数进行md5加密 然后比较加密后的值 与传递过来的值如果不同肯定被修改。
前端md5
function md5(string){function md5_RotateLeft(lValue, iShiftBits) { return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));}function md5_AddUnsigned(lX,lY){ var lX4,lY4,lX8,lY8,lResult; lX8 = (lX & 0x80000000); lY8 = (lY & 0x80000000); lX4 = (lX & 0x40000000); lY4 = (lY & 0x40000000); lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF); if (lX4 & lY4) { return (lResult ^ 0x80000000 ^ lX8 ^ lY8); } if (lX4 | lY4) { if (lResult & 0x40000000) { return (lResult ^ 0xC0000000 ^ lX8 ^ lY8); } else { return (lResult ^ 0x40000000 ^ lX8 ^ lY8); } } else { return (lResult ^ lX8 ^ lY8); }} function md5_F(x,y,z){ return (x & y) | ((~x) & z);}function md5_G(x,y,z){ return (x & z) | (y & (~z));}function md5_H(x,y,z){ return (x ^ y ^ z);}function md5_I(x,y,z){ return (y ^ (x | (~z)));}function md5_FF(a,b,c,d,x,s,ac){ a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac)); return md5_AddUnsigned(md5_RotateLeft(a, s), b);}; function md5_GG(a,b,c,d,x,s,ac){ a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac)); return md5_AddUnsigned(md5_RotateLeft(a, s), b);};function md5_HH(a,b,c,d,x,s,ac){ a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac)); return md5_AddUnsigned(md5_RotateLeft(a, s), b);}; function md5_II(a,b,c,d,x,s,ac){ a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac)); return md5_AddUnsigned(md5_RotateLeft(a, s), b);};function md5_ConvertToWordArray(string) { var lWordCount; var lMessageLength = string.length; var lNumberOfWords_temp1=lMessageLength + 8; var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64; var lNumberOfWords = (lNumberOfWords_temp2+1)*16; var lWordArray=Array(lNumberOfWords-1); var lBytePosition = 0; var lByteCount = 0; while ( lByteCount < lMessageLength ) { lWordCount = (lByteCount-(lByteCount % 4))/4; lBytePosition = (lByteCount % 4)*8; lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition)); lByteCount++; } lWordCount = (lByteCount-(lByteCount % 4))/4; lBytePosition = (lByteCount % 4)*8; lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition); lWordArray[lNumberOfWords-2] = lMessageLength<<3; lWordArray[lNumberOfWords-1] = lMessageLength>>>29; return lWordArray;}; function md5_WordToHex(lValue){ var WordToHexValue="",WordToHexValue_temp="",lByte,lCount; for(lCount = 0;lCount<=3;lCount++){ lByte = (lValue>>>(lCount*8)) & 255; WordToHexValue_temp = "0" + lByte.toString(16); WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2); } return WordToHexValue;};function md5_Utf8Encode(string){ string = string.replace(/\r\n/g,"\n"); var utftext = ""; for (var n = 0; n < string.length; n++) { var c = string.charCodeAt(n); if (c < 128) { utftext += String.fromCharCode(c); }else if((c > 127) && (c < 2048)) { utftext += String.fromCharCode((c >> 6) | 192); utftext += String.fromCharCode((c & 63) | 128); } else { utftext += String.fromCharCode((c >> 12) | 224); utftext += String.fromCharCode(((c >> 6) & 63) | 128); utftext += String.fromCharCode((c & 63) | 128); } } return utftext;}; var x=Array();var k,AA,BB,CC,DD,a,b,c,d;var S11=7, S12=12, S13=17, S14=22;var S21=5, S22=9 , S23=14, S24=20;var S31=4, S32=11, S33=16, S34=23;var S41=6, S42=10, S43=15, S44=21;string = md5_Utf8Encode(string);x = md5_ConvertToWordArray(string); a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476; for (k=0;k<x.length;k+=16) { AA=a; BB=b; CC=c; DD=d; a=md5_FF(a,b,c,d,x[k+0], S11,0xD76AA478); d=md5_FF(d,a,b,c,x[k+1], S12,0xE8C7B756); c=md5_FF(c,d,a,b,x[k+2], S13,0x242070DB); b=md5_FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE); a=md5_FF(a,b,c,d,x[k+4], S11,0xF57C0FAF); d=md5_FF(d,a,b,c,x[k+5], S12,0x4787C62A); c=md5_FF(c,d,a,b,x[k+6], S13,0xA8304613); b=md5_FF(b,c,d,a,x[k+7], S14,0xFD469501); a=md5_FF(a,b,c,d,x[k+8], S11,0x698098D8); d=md5_FF(d,a,b,c,x[k+9], S12,0x8B44F7AF); c=md5_FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1); b=md5_FF(b,c,d,a,x[k+11],S14,0x895CD7BE); a=md5_FF(a,b,c,d,x[k+12],S11,0x6B901122); d=md5_FF(d,a,b,c,x[k+13],S12,0xFD987193); c=md5_FF(c,d,a,b,x[k+14],S13,0xA679438E); b=md5_FF(b,c,d,a,x[k+15],S14,0x49B40821); a=md5_GG(a,b,c,d,x[k+1], S21,0xF61E2562); d=md5_GG(d,a,b,c,x[k+6], S22,0xC040B340); c=md5_GG(c,d,a,b,x[k+11],S23,0x265E5A51); b=md5_GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA); a=md5_GG(a,b,c,d,x[k+5], S21,0xD62F105D); d=md5_GG(d,a,b,c,x[k+10],S22,0x2441453); c=md5_GG(c,d,a,b,x[k+15],S23,0xD8A1E681); b=md5_GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8); a=md5_GG(a,b,c,d,x[k+9], S21,0x21E1CDE6); d=md5_GG(d,a,b,c,x[k+14],S22,0xC33707D6); c=md5_GG(c,d,a,b,x[k+3], S23,0xF4D50D87); b=md5_GG(b,c,d,a,x[k+8], S24,0x455A14ED); a=md5_GG(a,b,c,d,x[k+13],S21,0xA9E3E905); d=md5_GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8); c=md5_GG(c,d,a,b,x[k+7], S23,0x676F02D9); b=md5_GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A); a=md5_HH(a,b,c,d,x[k+5], S31,0xFFFA3942); d=md5_HH(d,a,b,c,x[k+8], S32,0x8771F681); c=md5_HH(c,d,a,b,x[k+11],S33,0x6D9D6122); b=md5_HH(b,c,d,a,x[k+14],S34,0xFDE5380C); a=md5_HH(a,b,c,d,x[k+1], S31,0xA4BEEA44); d=md5_HH(d,a,b,c,x[k+4], S32,0x4BDECFA9); c=md5_HH(c,d,a,b,x[k+7], S33,0xF6BB4B60); b=md5_HH(b,c,d,a,x[k+10],S34,0xBEBFBC70); a=md5_HH(a,b,c,d,x[k+13],S31,0x289B7EC6); d=md5_HH(d,a,b,c,x[k+0], S32,0xEAA127FA); c=md5_HH(c,d,a,b,x[k+3], S33,0xD4EF3085); b=md5_HH(b,c,d,a,x[k+6], S34,0x4881D05); a=md5_HH(a,b,c,d,x[k+9], S31,0xD9D4D039); d=md5_HH(d,a,b,c,x[k+12],S32,0xE6DB99E5); c=md5_HH(c,d,a,b,x[k+15],S33,0x1FA27CF8); b=md5_HH(b,c,d,a,x[k+2], S34,0xC4AC5665); a=md5_II(a,b,c,d,x[k+0], S41,0xF4292244); d=md5_II(d,a,b,c,x[k+7], S42,0x432AFF97); c=md5_II(c,d,a,b,x[k+14],S43,0xAB9423A7); b=md5_II(b,c,d,a,x[k+5], S44,0xFC93A039); a=md5_II(a,b,c,d,x[k+12],S41,0x655B59C3); d=md5_II(d,a,b,c,x[k+3], S42,0x8F0CCC92); c=md5_II(c,d,a,b,x[k+10],S43,0xFFEFF47D); b=md5_II(b,c,d,a,x[k+1], S44,0x85845DD1); a=md5_II(a,b,c,d,x[k+8], S41,0x6FA87E4F); d=md5_II(d,a,b,c,x[k+15],S42,0xFE2CE6E0); c=md5_II(c,d,a,b,x[k+6], S43,0xA3014314); b=md5_II(b,c,d,a,x[k+13],S44,0x4E0811A1); a=md5_II(a,b,c,d,x[k+4], S41,0xF7537E82); d=md5_II(d,a,b,c,x[k+11],S42,0xBD3AF235); c=md5_II(c,d,a,b,x[k+2], S43,0x2AD7D2BB); b=md5_II(b,c,d,a,x[k+9], S44,0xEB86D391); a=md5_AddUnsigned(a,AA); b=md5_AddUnsigned(b,BB); c=md5_AddUnsigned(c,CC); d=md5_AddUnsigned(d,DD);}return (md5_WordToHex(a)+md5_WordToHex(b)+md5_WordToHex(c)+md5_WordToHex(d)).toLowerCase(); }后台使用的md5
public String md5Encode(String inStr){MessageDigest md5 = null;try{md5 = MessageDigest.getInstance("MD5");}catch(Exception e){System.out.println(e.toString());e.printStackTrace();return "";}byte[] byteArray = null;try {byteArray = inStr.getBytes("UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}byte[] md5Bytes = md5.digest(byteArray);StringBuffer hexValue = new StringBuffer();for(int i=0;i<md5Bytes.length;i++){int val = md5Bytes[i] & 0xff;if(val<16){hexValue.append("0");}hexValue.append(Integer.toHexString(val));}return hexValue.toString();}阅读全文
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