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如何通过JS实现base64加密解密?

2016-09-22 15:24:01 来源:www.45fan.com 【

如何通过JS实现base64加密解密?

本文实例讲述了JS实现的base64加密解密。分享给大家供大家参考,具体如下:

完整的代码:

<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);
<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 xxxx10xx xxxx10xx 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>

关于base64加密解密还可参看本站在线工具

BASE64编码解码工具

更多加密解密内容还可参考:

MD5在线加密工具

URL网址16进制加密工具

迅雷、快车、旋风URL加密/解密工具

在线SHA1加密工具

希望本文所述对大家JavaScript程序设计有所帮助。


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Tags: 实现 Base64 完整
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