JS编码方式:
<script type="text/javascript"> document.write(encodeURI("http://www.w3school.com.cn/My first/")+ "<br />")//编译 document.write(decodeURI("http://www.w3school.com.cn/My first/")+ "<br />")//反编译 document.write(encodeURI(",/?:@&=+$#")+ "<br />") document.write(encodeURIComponent("http://www.w3school.com.cn/My first/")+ "<br />") document.write(escape("http://www.w3school.com.cn/My first/123")+ "<br />")//编译 document.write(unescape("http://www.w3school.com.cn/My first/123")+ "<br />")//反编译 </script>
<script type="text/javascript"> <!-- var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv" + "wxyz0123456789+/" + "="; //加密函数 function encode64(input) { input = escape(input);//注意escape()函数 var output = ""; var chr1, chr2, chr3 = ""; var enc1, enc2, enc3, enc4 = ""; var i = 0; do { chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(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 + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4); chr1 = chr2 = chr3 = ""; enc1 = enc2 = enc3 = enc4 = ""; } while (i < input.length); return output; } //解密函数 function decode64(input) { var output = ""; var chr1, chr2, chr3 = ""; var enc1, enc2, enc3, enc4 = ""; var i = 0; // remove all characters that are not A-Z, a-z, 0-9, +, /, or = var base64test = /[^A-Za-z0-9+/=]/g; if (base64test.exec(input)) { alert("There were invalid base64 characters in the input text. " + "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '=' " + "Expect errors in decoding."); } input = input.replace(/[^A-Za-z0-9+/=]/g, ""); do { enc1 = keyStr.indexOf(input.charAt(i++)); enc2 = keyStr.indexOf(input.charAt(i++)); enc3 = keyStr.indexOf(input.charAt(i++)); enc4 = keyStr.indexOf(input.charAt(i++)); chr1 = (enc1 << 2) | (enc2 >> 4); chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); chr3 = ((enc3 & 3) << 6) | enc4; output = output + String.fromCharCode(chr1); if (enc3 != 64) { output = output + String.fromCharCode(chr2); } if (enc4 != 64) { output = output + String.fromCharCode(chr3); } chr1 = chr2 = chr3 = ""; enc1 = enc2 = enc3 = enc4 = ""; } while (i < input.length); return unescape(output);//注意unescape()函数 } //--></script>
当我们采用encode64(input)函数对数据加密之后,当要在Java代码中对数据解密时,我们不能调用js的decoder(input)函数,必须使用Java语言编写的函数。
apache公司提供的commons-codec-1.3.jar类库中的org.apache.commons.codec.binary.Base64包提供了encodeBase64(byte[] bts)和decodeBase64(byte[] bts)方法实现了数据的Base64()加密,但与上面的js代码的加密和解密函数并不一一对应,为例实现用js代码加密,用java函数解密,我们必须调用另外一个java函数,unescape(String src),其代码如下:
private static String unescape(String src) { StringBuffer tmp = new StringBuffer(); tmp.ensureCapacity(src.length()); int lastPos = 0, pos = 0; char ch; while (lastPos < src.length()) { pos = src.indexOf("%", lastPos); if (pos == lastPos) { if (src.charAt(pos + 1) == 'u') { ch = (char) Integer.parseInt(src .substring(pos + 2, pos + 6), 16); tmp.append(ch); lastPos = pos + 6; } else { ch = (char) Integer.parseInt(src .substring(pos + 1, pos + 3), 16); tmp.append(ch); lastPos = pos + 3; } } else { if (pos == -1) { tmp.append(src.substring(lastPos)); lastPos = src.length(); } else { tmp.append(src.substring(lastPos, pos)); lastPos = pos; } } } return tmp.toString(); }
与js代码中的unescape() 函数对应,才能正确的对数据信息解密,解密方法为:
public static String decode64(String encode){ //调用org.apache.commons.codec.binary.Base64包,在commons-codec-1.3.jar中 Base64 base64 = new Base64(); byte[] byteOfEncode = encode.getBytes(); byte[] byteOfDecode = Base64.decodeBase64(byteOfEncode);//调用decodeBase64方法 String decode = new String(byteOfDecode); return unescape(decode);//调用unescape(String src)方法 } 附:在网上找到的java编写的escape()方法: public class EscapeUnescape { public static String escape(String src) { int i; char j; StringBuffer tmp = new StringBuffer(); tmp.ensureCapacity(src.length() * 6); for (i = 0; i < src.length(); i++) { j = src.charAt(i); if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j)) tmp.append(j); else if (j < 256) { tmp.append("%"); if (j < 16) tmp.append("0"); tmp.append(Integer.toString(j, 16)); } else { tmp.append("%u"); tmp.append(Integer.toString(j, 16)); } } return tmp.toString(); }
asp.net平台,base64加密和解密方法:
/// <summary> /// Encrypt 的摘要说明 /// </summary> public class Encrypt { public Encrypt() { // // TODO: 在此处添加构造函数逻辑 // } /// <summary> /// Base64加密,采用utf8编码方式加密 /// </summary> /// <param name="source">待加密的明文</param> /// <returns>加密后的字符串</returns> public static string EncodeBase64(string source) { return Convert.ToBase64String(Encoding.Default.GetBytes(source)); } /// <summary> /// Base64解密 /// </summary> /// <param name="result">待解密的密文</param> /// <returns>解密后的字符串</returns> public static string DecodeBase64(string result) { return Encoding.Default.GetString(Convert.FromBase64String(result)); } }
JS与后台对应base64加密方式:
<HTML> <HEAD> <TITLE>Base64</TITLE> <script language=javascript> var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var base64DecodeChars = new Array( -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1); function base64encode(str) { var out, i, len; var c1, c2, c3; len = str.length; i = 0; out = ""; while(i < len) { c1 = str.charCodeAt(i++) & 0xff; if(i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt((c1 & 0x3) << 4); out += "=="; break; } c2 = str.charCodeAt(i++); if(i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); out += base64EncodeChars.charAt((c2 & 0xF) << 2); out += "="; break; } c3 = str.charCodeAt(i++); out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)); out += base64EncodeChars.charAt(c3 & 0x3F); } return out; } function base64decode(str) { var c1, c2, c3, c4; var i, len, out; len = str.length; i = 0; out = ""; while(i < len) { /* c1 */ do { c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; } while(i < len && c1 == -1); if(c1 == -1) break; /* c2 */ do { c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; } while(i < len && c2 == -1); if(c2 == -1) break; out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); /* c3 */ do { c3 = str.charCodeAt(i++) & 0xff; if(c3 == 61) return out; c3 = base64DecodeChars[c3]; } while(i < len && c3 == -1); if(c3 == -1) break; out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)); /* c4 */ do { c4 = str.charCodeAt(i++) & 0xff; if(c4 == 61) return out; c4 = base64DecodeChars[c4]; } while(i < len && c4 == -1); if(c4 == -1) break; out += String.fromCharCode(((c3 & 0x03) << 6) | c4); } return out; } function utf16to8(str) { var out, i, len, c; out = ""; len = str.length; for(i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007F)) { out += str.charAt(i); } else if (c > 0x07FF) { out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } else { out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } } return out; } function utf8to16(str) { var out, i, len, c; var char2, char3; out = ""; len = str.length; i = 0; while(i < len) { c = str.charCodeAt(i++); switch(c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: // 0xxxxxxx out += str.charAt(i-1); break; case 12: case 13: // 110x xxxx 10xx xxxx char2 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F)); break; case 14: // 1110 xxxx 10xx xxxx 10xx xxxx char2 = str.charCodeAt(i++); char3 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); break; } } return out; } function doit() { var f = document.f f.output.value = base64encode(utf16to8(f.source.value)) f.decode.value = utf8to16(base64decode(f.output.value)) } </script> </HEAD> <BODY> <H1>Base64</H1> <FORM NAME="f"> 原码<BR> <TEXTAREA NAME="source" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR> Base64 encode<BR> <TEXTAREA NAME="output" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR> Base64 decode<BR> <TEXTAREA NAME="decode" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR> <INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()"> </FORM> </BODY>
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C#实现MD532位加密
/// <summary> /// md5加密 /// </summary> /// <param name="ConvertString">MD5加密的字符</param> /// <returns>32位小写字符</returns> public static string EncryptMd5(string ConvertString) { string StrEncode = ""; MD5 md = MD5.Create(); StrEncode = BitConverter.ToString(md.ComputeHash(Encoding.Default.GetBytes(ConvertString))).Replace("-", "").ToLower(); return StrEncode; }
C#实现MD516位加密
/// <summary> /// MD5加密 /// </summary> /// <param name="strText">加密字符串</param> /// <returns></returns> public static string MD5Encrypt(string strText) { string StrEncode = ""; MD5 md = MD5.Create(); StrEncode = BitConverter.ToString(md.ComputeHash(Encoding.UTF8.GetBytes(strText)),4,8).Replace("-", "").ToLower(); return StrEncode; }