MD5不是加密算法，它是Hash算法，所以它不可逆，也没法还原成原文。
你可以用base64、异或或者aes des等加密算法去实现。
1、base64加密
123456789101112131415161718<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>base64加密</title><script type="text/javascript" src="base64js"></script><script type="text/javascript"> var b = new Base64(); var str = bencode("admin:admin"); alert("base64 encode:" + str);//解密 str = bdecode(str); alert("base64 decode:" + str);</script></head><body></body></html>2、md5加密
在页面中引用md5js文件，调用方法为
1234567891011121314<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>md5加密</title><script type="text/ecmascript" src="md5js"></script><script type="text/javascript"> var hash = hex_md5("123dafd"); alert(hash)</script></head><body></body></html>3、sha1加密
据说这是最安全的加密
页面中引入sha1js，调用方法为
1234567891011121314<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>sha1加密</title><script type="text/ecmascript" src="sha1js"></script><script type="text/javascript"> var sha = hex_sha1('mima123465') alert(sha)</script></head><body></body></html>一下为js们的源代码
base64js：
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106/ Base64 encode / decode @author haitaotu @date 2010-04-26 @email tuhaitao@foxmailcom/function Base64() { // private property _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; // public method for encoding thisencode = function (input) { var output = ""; var chr1, chr2, chr3, enc1, enc2, enc3, enc4; var i = 0; input = _utf8_encode(input); while (i < inputlength) { chr1 = inputcharCodeAt(i++); chr2 = inputcharCodeAt(i++); chr3 = inputcharCodeAt(i++); enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); enc4 = chr3 & 63; if (isNaN(chr2)) { enc3 = enc4 = 64; } else if (isNaN(chr3)) { enc4 = 64; } output = output + _keyStrcharAt(enc1) + _keyStrcharAt(enc2) + _keyStrcharAt(enc3) + _keyStrcharAt(enc4); } return output; } // public method for decoding thisdecode = function (input) { var output = ""; var chr1, chr2, chr3; var enc1, enc2, enc3, enc4; var i = 0; input = inputreplace(/[^A-Za-z0-9\+\/\=]/g, ""); while (i < inputlength) { enc1 = _keyStrindexOf(inputcharAt(i++)); enc2 = _keyStrindexOf(inputcharAt(i++)); enc3 = _keyStrindexOf(inputcharAt(i++)); enc4 = _keyStrindexOf(inputcharAt(i++)); chr1 = (enc1 << 2) | (enc2 >> 4); chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); chr3 = ((enc3 & 3) << 6) | enc4; output = output + StringfromCharCode(chr1); if (enc3 != 64) { output = output + StringfromCharCode(chr2); } if (enc4 != 64) { output = output + StringfromCharCode(chr3); } } output = _utf8_decode(output); return output; } // private method for UTF-8 encoding _utf8_encode = function (string) { string = stringreplace(/\r\n/g,"\n"); var utftext = ""; for (var n = 0; n < stringlength; n++) { var c = stringcharCodeAt(n); if (c < 128) { utftext += StringfromCharCode(c); } else if((c > 127) && (c < 2048)) { utftext += StringfromCharCode((c >> 6) | 192); utftext += StringfromCharCode((c & 63) | 128); } else { utftext += StringfromCharCode((c >> 12) | 224); utftext += StringfromCharCode(((c >> 6) & 63) | 128); utftext += StringfromCharCode((c & 63) | 128); } } return utftext; } // private method for UTF-8 decoding _utf8_decode = function (utftext) { var string = ""; var i = 0; var c = c1 = c2 = 0; while ( i < utftextlength ) { c = utftextcharCodeAt(i); if (c < 128) { string += StringfromCharCode(c); i++; } else if((c > 191) && (c < 224)) { c2 = utftextcharCodeAt(i+1); string += StringfromCharCode(((c & 31) << 6) | (c2 & 63)); i += 2; } else { c2 = utftextcharCodeAt(i+1); c3 = utftextcharCodeAt(i+2); string += StringfromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); i += 3; } } return string; }}PSP模拟的PS游戏其实是一个单独的文件包，包里含有一个EBOOTPBP的文件PS模拟游戏文件放置位置如下：H（你记忆棒盘符号） / PSP / GAME / XXXXX / EBOOTPBP要看清楚上面如何放置的说明，照这样放，显示文件损坏是你拿错了文件包有问题再追问您可以根据这个后缀确定是用什么方法加密的，然后联系这款软件的客服试试。
给文件加密，我使用的是超级加密3000
超级加密3000采用国际上成熟的加密算法和安全快速的加密方法，可以有效保障数据安全!
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