rsa加解密 --- jsencrypt.min.js --- 支持长字符串分段加解密
前端 + rsa加解密 + jsencrypt.min.js–（新增超长字符分段加解密）
分享2种，分段 和 不分段 加解密 --话不多说，直接上代码！~
最终效果：
首先引入2个js
<script src="js/jquery-1.11.3.min.js"></script>
<script src="js/jsencrypt.min.js"></script>
html部分：
<label for="privkey">私钥</label>
<br/>
<textarea id="privkey" rows="15" cols="65">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</textarea>
<br/>
<label for="pubkey">公钥</label>
<br/>
<textarea id="pubkey" rows="15" cols="65">MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC8JU1nBDZ5PgRNAxksTC/MlaBX37vjTH84ppzmuEpH7e6G43QXd7Zof8apIJ4efk6Uiw2/OJfkyMGDsAJTv/zWnuKm6UeyBYxtgP5JFGtTMKTBVuGzH8UzYWdPzybIOCmj55Qku3nYEZyro38dGhSFLSPaU3eoY1tblm5ZFJ+8ewIDAQAB</textarea>
<br/>
<label for="input">要加密的字符串:</label>
<br/>
<textarea id="input" name="input" type="text" rows='4' cols='70'>123456789</textarea>
<br/>
<input id="testme" type="button" value="Test Me!!!" />
<br/>
<label for="jiami">加密后的密文:</label>
<br/>
<textarea id="jiami" name="jiami" type="text" rows='4' cols='70'></textarea>
<br/>
<label for="pubkey">解密后的密文</label>
<br/>
<textarea id="jiemi" name="jiemi" type="text" rows='4' cols='70'></textarea>
js部分：
$(function() {
$('#testme').click(function() {
// 进行RSA加密
var encrypt = new JSEncrypt();
//获取公钥
encrypt.setPublicKey($('#pubkey').val());
//公钥加密
var encrypted = encrypt.encryptLong2($('#input').val());
// 加密后的密文
$('#jiami').val(encrypted);
//解密
var decrypt = new JSEncrypt();
//获取私钥
decrypt.setPrivateKey($('#privkey').val());
//解药
var uncrypted = decrypt.decryptLong2(encrypted);
$('#jiemi').val(uncrypted);
});
});
jsencrypt.min.js下载地址：github主页 官方网站
jq库：http://code.jquery.com/jquery-1.8.3.min.js
(注！jquery-2.0以上版本不再支持IE 6/7/8) 并不是最新的版本就最好的，而是根据您项目需求所适合的版本！
↑↑↑↑以上是不分段的↑↑↑↑
下面在贴个超长字符串分段处理：
1.首先引入一段转换的js
//十六进制转字节
function hexToBytes(hex) {
for (var bytes = [], c = 0; c < hex.length; c += 2)
bytes.push(parseInt(hex.substr(c, 2), 16));
return bytes;
}
// 字节转十六进制
function bytesToHex(bytes) {
for (var hex = [], i = 0; i < bytes.length; i++) {
hex.push((bytes[i] >>> 4).toString(16));
hex.push((bytes[i] & 0xF).toString(16));
}
return hex.join("");
}
2.在引入分段加解密js（这里有2种方法供选择，建议使用方法2）
*：如果与JAVA后台数据交互。某些中文字符可能因为编码原因会乱码，可以加密前先进行 encodeURIComponent(s)。然后解密后在decode回来。
方法一：
//方法一
JSEncrypt.prototype.encryptLong=function (d){
var k = this.key;
var maxLength = (((k.n.bitLength() + 7) >> 3) - 11);
try {
var lt = "";
var ct = "";
if (d.length > maxLength) {
lt = d.match(/.{1,117}/g);
lt.forEach(function (entry) {
var t1 = k.encrypt(entry);
ct += t1;
});
return hexToBytes(ct);
}
var t = k.encrypt(d);
var y = hexToBytes(t);
return y;
} catch (ex) {
return false;
}
}
JSEncrypt.prototype.decryptLong = function (string) {
var k = this.getKey();
var maxLength = ((k.n.bitLength() + 7) >> 3);
//var maxLength = 128;
try {
var str = bytesToHex(string);
//var b=hex2Bytes(str);
var inputLen = str.length;
var ct = "";
if (str.length > maxLength) {
var lt = str.match(/.{1,256}/g);
lt.forEach(function (entry) {
var t1 = k.decrypt(entry);
ct += t1;
});
return ct;
}
var y = k.decrypt(bytesToHex(string));
return y;
} catch (ex) {
return false;
}
};
方法二：
//方法2
JSEncrypt.prototype.encryptLong2 = function (string) {
var k = this.getKey();
try {
var lt = "";
var ct = "";
//RSA每次加密117bytes，需要辅助方法判断字符串截取位置
//1.获取字符串截取点
var bytes = new Array();
bytes.push(0);
var byteNo = 0;
var len, c;
len = string.length;
var temp = 0;
for (var i = 0; i < len; i++) {
c = string.charCodeAt(i);
if (c >= 0x010000 && c <= 0x10FFFF) {
byteNo += 4;
} else if (c >= 0x000800 && c <= 0x00FFFF) {
byteNo += 3;
} else if (c >= 0x000080 && c <= 0x0007FF) {
byteNo += 2;
} else {
byteNo += 1;
}
if ((byteNo % 117) >= 114 || (byteNo % 117) == 0) {
if (byteNo - temp >= 114) {
bytes.push(i);
temp = byteNo;
}
}
}
//2.截取字符串并分段加密
if (bytes.length > 1) {
for (var i = 0; i < bytes.length - 1; i++) {
var str;
if (i == 0) {
str = string.substring(0, bytes[i + 1] + 1);
} else {
str = string.substring(bytes[i] + 1, bytes[i + 1] + 1);
}
var t1 = k.encrypt(str);
ct += t1;
}
;
if (bytes[bytes.length - 1] != string.length - 1) {
var lastStr = string.substring(bytes[bytes.length - 1] + 1);
ct += k.encrypt(lastStr);
}
return hexToBytes(ct);
}
var t = k.encrypt(string);
var y = hexToBytes(t);
return y;
} catch (ex) {
return false;
}
};
JSEncrypt.prototype.decryptLong2 = function (string) {
var k = this.getKey();
// var maxLength = ((k.n.bitLength()+7)>>3);
var MAX_DECRYPT_BLOCK = 128;
try {
var ct = "";
var t1;
var bufTmp;
var hexTmp;
var str = bytesToHex(string);
var buf = hexToBytes(str);
var inputLen = buf.length;
//开始长度
var offSet = 0;
//结束长度
var endOffSet = MAX_DECRYPT_BLOCK;
//分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
bufTmp = buf.slice(offSet, endOffSet);
hexTmp = bytesToHex(bufTmp);
t1 = k.decrypt(hexTmp);
ct += t1;
} else {
bufTmp = buf.slice(offSet, inputLen);
hexTmp = bytesToHex(bufTmp);
t1 = k.decrypt(hexTmp);
ct += t1;
}
offSet += MAX_DECRYPT_BLOCK;
endOffSet += MAX_DECRYPT_BLOCK;
}
return ct;
} catch (ex) {
return false;
}
};
3.再配上前面的html 和 js调用部分，就可以加解密任意长度的字符串啦，这里就不重复写了。
希望大家能够用的上哈，其实这个不推荐分段的，太长的话比较慢！！！一般就是用文章顶部的就足够了，做下登录密码的加解密就行了.
#不想粘贴的童鞋到这里下载一个demo看看吧：下载地址