对某些网站的登录包进行抓包时发现，客户端对用户名进行了加密，然后传给服务器进行校验。

使用chrome调试功能断点调试，发现网站用javascript对用户名做了rsa加密。

为了实现网站的自动登录，需要模拟这个加密过程。

网上搜了下关于rsa加密的最简明的解释：

rsa加密是非对称加密算法，该算法基于一个十分简单的数论事实：将两个大素数相乘十分容易，但那时想要对其乘积进行因式分解却极其困难，因此可以将乘积公开作为加密密钥，即公钥，而两个大素数组合成私钥。公钥是可发布的供任何人使用，私钥则为自己所有，供解密之用。

断点调试：

经过分析，登录网站使用公钥对用户名进行加密，公钥值在登录页面响应报文中可以找到，一般为exponent和modulus。

其中exponent为指数，一般为65537，十六进制为010001。

modulus为加密算法中用到的n值，即大数乘积，一般rsa加密算法的介绍文章中都是：(N,e)为公钥，(N,d)为私钥

js代码中有详细的实现过程，比较复杂，如果看懂了再用python来实现，代价太高。

我尝试了三种解决方式：

1、将js代码扣出来，借用浏览器来执行

即使用python的webserver功能，在浏览器上实现js的计算，并将结果返回给客户端

使用python2.7 的BaseHTTPServer模块实现一个模拟加密的过程

server端代码：

#!/usr/bin/env python

# coding:utf-8

from BaseHTTPServer import HTTPServer,BaseHTTPRequestHandler

import io,shutil,urllib

import urlparse

class RequestHandler(BaseHTTPRequestHandler):

#def do_Head(self):

#self._writeheaders()

def _writeheaders(self):

self.send_response(200)

self.send_header('Content-type', 'text/html')

self.end_headers()

def do_GET(self):

parsed_path = urlparse.urlparse(self.path);

self._writeheaders()

self.wfile.write("""

RSATEST

/*

* RSA, a suite of routines for performing RSA public-key computations in JavaScript.

* Copyright 1998-2005 David Shapiro.

* Dave Shapiro

* dave@ohdave.com

* changed by Fuchun, 2010-05-06

* fcrpg2005@gmail.com

*/

(function($w) {

if(typeof $w.RSAUtils === 'undefined')

var RSAUtils = $w.RSAUtils = {};

var biRadixBase = 2;

var biRadixBits = 16;

var bitsPerDigit = biRadixBits;

var biRadix = 1 << 16; // = 2^16 = 65536

var biHalfRadix = biRadix >>> 1;

var biRadixSquared = biRadix * biRadix;

var maxDigitVal = biRadix - 1;

var maxInteger = 9999999999999998;

//maxDigits:

//Change this to accommodate your largest number size. Use setMaxDigits()

//to change it!

//

//In general, if you're working with numbers of size N bits, you'll need 2*N

//bits of storage. Each digit holds 16 bits. So, a 1024-bit key will need

//

//1024 * 2 / 16 = 128 digits of storage.

//

var maxDigits;

var ZERO_ARRAY;

var bigZero, bigOne;

var BigInt = $w.BigInt = function(flag) {

if (typeof flag == "boolean" && flag == true) {

this.digits = null;

} else {

this.digits = ZERO_ARRAY.slice(0);

}

this.isNeg = false;

};

RSAUtils.setMaxDigits = function(value) {

maxDigits = value;

ZERO_ARRAY = new Array(maxDigits);

for (var iza = 0; iza < ZERO_ARRAY.length; iza++) ZERO_ARRAY[iza] = 0;

bigZero = new BigInt();

bigOne = new BigInt();

bigOne.digits[0] = 1;

};

RSAUtils.setMaxDigits(20);

//The maximum number of digits in base 10 you can convert to an

//integer without JavaScript throwing up on you.

var dpl10 = 15;

RSAUtils.biFromNumber = function(i) {

var result = new BigInt();

result.isNeg = i < 0;

i = Math.abs(i);

var j = 0;

while (i > 0) {

result.digits[j++] = i & maxDigitVal;

i = Math.floor(i / biRadix);

}

return result;

};

//lr10 = 10 ^ dpl10

var lr10 = RSAUtils.biFromNumber(1000000000000000);

RSAUtils.biFromDecimal = function(s) {

var isNeg = s.charAt(0) == '-';

var i = isNeg ? 1 : 0;

var result;

// Skip leading zeros.

while (i < s.length && s.charAt(i) == '0') ++i;

if (i == s.length) {

result = new BigInt();

}

else {

var digitCount = s.length - i;

var fgl = digitCount % dpl10;

if (fgl == 0) fgl = dpl10;

result = RSAUtils.biFromNumber(Number(s.substr(i, fgl)));

i += fgl;

while (i < s.length) {

result = RSAUtils.biAdd(RSAUtils.biMultiply(result, lr10),

RSAUtils.biFromNumber(Number(s.substr(i, dpl10))));

i += dpl10;

}

result.isNeg = isNeg;

}

return result;

};

RSAUtils.biCopy = function(bi) {

var result = new BigInt(true);

result.digits = bi.digits.slice(0);

result.isNeg = bi.isNeg;

return result;

};

RSAUtils.reverseStr = function(s) {

var result = "";

for (var i = s.length - 1; i > -1; --i) {

result += s.charAt(i);

}

return result;

};

var hexatrigesimalToChar = [

'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',

'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',

'u', 'v', 'w', 'x', 'y', 'z'

];

RSAUtils.biToString = function(x, radix) { // 2 <= radix <= 36

var b = new BigInt();

b.digits[0] = radix;

var qr = RSAUtils.biDivideModulo(x, b);

var result = hexatrigesimalToChar[qr[1].digits[0]];

while (RSAUtils.biCompare(qr[0], bigZero) == 1) {

qr = RSAUtils.biDivideModulo(qr[0], b);

digit = qr[1].digits[0];

result += hexatrigesimalToChar[qr[1].digits[0]];

}

return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);

};

RSAUtils.biToDecimal = function(x) {

var b = new BigInt();

b.digits[0] = 10;

var qr = RSAUtils.biDivideModulo(x, b);

var result = String(qr[1].digits[0]);

while (RSAUtils.biCompare(qr[0], bigZero) == 1) {

qr = RSAUtils.biDivideModulo(qr[0], b);

result += String(qr[1].digits[0]);

}

return (x.isNeg ? "-" : "") + RSAUtils.reverseStr(result);

};

var hexToChar = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

'a', 'b', 'c', 'd', 'e', 'f'];

RSAUtils.digitToHex = function(n) {

var mask = 0xf;

var result = "";

for (i = 0; i < 4; ++i) {

result += hexToChar[n & mask];

n >>>= 4;

}

return RSAUtils.reverseStr(result);

};

RSAUtils.biToHex = function(x) {

var result = "";

var n = RSAUtils.biHighIndex(x);

for (var i = RSAUtils.biHighIndex(x); i > -1; --i) {

result += RSAUtils.digitToHex(x.digits[i]);

}

return result;

};

RSAUtils.charToHex = function(c) {

var ZERO = 48;

var NINE = ZERO + 9;

var littleA = 97;

var littleZ = littleA + 25;

var bigA = 65;

var bigZ = 65 + 25;

var result;

if (c >= ZERO && c <= NINE) {

result = c - ZERO;

} else if (c >= bigA && c <= bigZ) {

result = 10 + c - bigA;

} else if (c >= littleA && c <= littleZ) {

result = 10 + c - littleA;

} else {

result = 0;

}

return result;

};

RSAUtils.hexToDigit = function(s) {

var result = 0;

var sl = Math.min(s.length, 4);

for (var i = 0; i < sl; ++i) {

result <<= 4;

result |= RSAUtils.charToHex(s.charCodeAt(i));

}

return result;

};

RSAUtils.biFromHex = function(s) {

var result = new BigInt();

var sl = s.length;

for (var i = sl, j = 0; i > 0; i -= 4, ++j) {

result.digits[j] = RSAUtils.hexToDigit(s.substr(Math.max(i - 4, 0), Math.min(i, 4)));

}

return result;

};

RSAUtils.biFromString = function(s, radix) {

var isNeg = s.charAt(0) == '-';

var istop = isNeg ? 1 : 0;

var result = new BigInt();

var place = new BigInt();

place.digits[0] = 1; // radix^0

for (var i = s.length - 1; i >= istop; i--) {

var c = s.charCodeAt(i);

var digit = RSAUtils.charToHex(c);

var biDigit = RSAUtils.biMultiplyDigit(place, digit);

result = RSAUtils.biAdd(result, biDigit);

place = RSAUtils.biMultiplyDigit(place, radix);

}

result.isNeg = isNeg;

return result;

};

RSAUtils.biDump = function(b) {

return (b.isNeg ? "-" : "") + b.digits.join(" ");

};

RSAUtils.biAdd = function(x, y) {

var result;

if (x.isNeg != y.isNeg) {

y.isNeg = !y.isNeg;

result = RSAUtils.biSubtract(x, y);

y.isNeg = !y.isNeg;

}

else {

result = new BigInt();

var c = 0;

var n;

for (var i = 0; i < x.digits.length; ++i) {

n = x.digits[i] + y.digits[i] + c;

result.digits[i] = n % biRadix;

c = Number(n >= biRadix);

}

result.isNeg = x.isNeg;

}

return result;

};

RSAUtils.biSubtract = function(x, y) {

var result;

if (x.isNeg != y.isNeg) {

y.isNeg = !y.isNeg;

result = RSAUtils.biAdd(x, y);

y.isNeg = !y.isNeg;

} else {

result = new BigInt();

var n, c;

c = 0;

for (var i = 0; i < x.digits.length; ++i) {

n = x.digits[i] - y.digits[i] + c;

result.digits[i] = n % biRadix;

// Stupid non-conforming modulus operation.

if (result.digits[i] < 0) result.digits[i] += biRadix;

c = 0 - Number(n < 0);

}

// Fix up the negative sign, if any.

if (c == -1) {

c = 0;

for (var i = 0; i < x.digits.length; ++i) {

n = 0 - result.digits[i] + c;

result.digits[i] = n % biRadix;

// Stupid non-conforming modulus operation.

if (result.digits[i] < 0) result.digits[i] += biRadix;

c = 0 - Number(n < 0);

}

// Result is opposite sign of arguments.

result.isNeg = !x.isNeg;

} else {

// Result is same sign.

result.isNeg = x.isNeg;

}

}

return result;

};

RSAUtils.biHighIndex = function(x) {

var result = x.digits.length - 1;

while (result > 0 && x.digits[result] == 0) --result;

return result;

};

RSAUtils.biNumBits = function(x) {

var n = RSAUtils.biHighIndex(x);

var d = x.digits[n];

var m = (n + 1) * bitsPerDigit;

var result;

for (result = m; result > m - bitsPerDigit; --result) {

if ((d & 0x8000) != 0) break;

d <<= 1;

}

return result;

};

RSAUtils.biMultiply = function(x, y) {

var result = new BigInt();

var c;

var n = RSAUtils.biHighIndex(x);

var t = RSAUtils.biHighIndex(y);

var u, uv, k;

for (var i = 0; i <= t; ++i) {

c = 0;

k = i;

for (j = 0; j <= n; ++j, ++k) {

uv = result.digits[k] + x.digits[j] * y.digits[i] + c;

result.digits[k] = uv & maxDigitVal;

c = uv >>> biRadixBits;

//c = Math.floor(uv / biRadix);

}

result.digits[i + n + 1] = c;

}

// Someone give me a logical xor, please.

result.isNeg = x.isNeg != y.isNeg;

return result;

};

RSAUtils.biMultiplyDigit = function(x, y) {

var n, c, uv;

result = new BigInt();

n = RSAUtils.biHighIndex(x);

c = 0;

for (var j = 0; j <= n; ++j) {

uv = result.digits[j] + x.digits[j] * y + c;

result.digits[j] = uv & maxDigitVal;

c = uv >>> biRadixBits;

//c = Math.floor(uv / biRadix);

}

result.digits[1 + n] = c;

return result;

};

RSAUtils.arrayCopy = function(src, srcStart, dest, destStart, n) {

var m = Math.min(srcStart + n, src.length);

for (var i = srcStart, j = destStart; i < m; ++i, ++j) {

dest[j] = src[i];

}

};

var highBitMasks = [0x0000, 0x8000, 0xC000, 0xE000, 0xF000, 0xF800,

0xFC00, 0xFE00, 0xFF00, 0xFF80, 0xFFC0, 0xFFE0,

0xFFF0, 0xFFF8, 0xFFFC, 0xFFFE, 0xFFFF];

RSAUtils.biShiftLeft = function(x, n) {

var digitCount = Math.floor(n / bitsPerDigit);

var result = new BigInt();

RSAUtils.arrayCopy(x.digits, 0, result.digits, digitCount,

result.digits.length - digitCount);

var bits = n % bitsPerDigit;

var rightBits = bitsPerDigit - bits;

for (var i = result.digits.length - 1, i1 = i - 1; i > 0; --i, --i1) {

result.digits[i] = ((result.digits[i] << bits) & maxDigitVal) |

((result.digits[i1] & highBitMasks[bits]) >>>

(rightBits));

}

result.digits[0] = ((result.digits[i] << bits) & maxDigitVal);

result.isNeg = x.isNeg;

return result;

};

var lowBitMasks = [0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F,

0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF,

0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF];

RSAUtils.biShiftRight = function(x, n) {

var digitCount = Math.floor(n / bitsPerDigit);

var result = new BigInt();

RSAUtils.arrayCopy(x.digits, digitCount, result.digits, 0,

x.digits.length - digitCount);

var bits = n % bitsPerDigit;

var leftBits = bitsPerDigit - bits;

for (var i = 0, i1 = i + 1; i < result.digits.length - 1; ++i, ++i1) {

result.digits[i] = (result.digits[i] >>> bits) |

((result.digits[i1] & lowBitMasks[bits]) << leftBits);

}

result.digits[result.digits.length - 1] >>>= bits;

result.isNeg = x.isNeg;

return result;

};

RSAUtils.biMultiplyByRadixPower = function(x, n) {

var result = new BigInt();

RSAUtils.arrayCopy(x.digits, 0, result.digits, n, result.digits.length - n);

return result;

};

RSAUtils.biDivideByRadixPower = function(x, n) {

var result = new BigInt();

RSAUtils.arrayCopy(x.digits, n, result.digits, 0, result.digits.length - n);

return result;

};

RSAUtils.biModuloByRadixPower = function(x, n) {

var result = new BigInt();

RSAUtils.arrayCopy(x.digits, 0, result.digits, 0, n);

return result;

};

RSAUtils.biCompare = function(x, y) {

if (x.isNeg != y.isNeg) {

return 1 - 2 * Number(x.isNeg);

}

for (var i = x.digits.length - 1; i >= 0; --i) {

if (x.digits[i] != y.digits[i]) {

if (x.isNeg) {

return 1 - 2 * Number(x.digits[i] > y.digits[i]);

} else {

return 1 - 2 * Number(x.digits[i] < y.digits[i]);

}

}

}

return 0;

};

RSAUtils.biDivideModulo = function(x, y) {

var nb = RSAUtils.biNumBits(x);

var tb = RSAUtils.biNumBits(y);

var origYIsNeg = y.isNeg;

var q, r;

if (nb < tb) {

// |x| < |y|

if (x.isNeg) {

q = RSAUtils.biCopy(bigOne);

q.isNeg = !y.isNeg;

x.isNeg = false;

y.isNeg = false;

r = biSubtract(y, x);

// Restore signs, 'cause they're references.

x.isNeg = true;

y.isNeg = origYIsNeg;

} else {

q = new BigInt();

r = RSAUtils.biCopy(x);

}

return [q, r];

}

q = new BigInt();

r = x;

// Normalize Y.

var t = Math.ceil(tb / bitsPerDigit) - 1;

var lambda = 0;

while (y.digits[t] < biHalfRadix) {

y = RSAUtils.biShiftLeft(y, 1);

++lambda;

++tb;

t = Math.ceil(tb / bitsPerDigit) - 1;

}

// Shift r over to keep the quotient constant. We'll shift the

// remainder back at the end.

r = RSAUtils.biShiftLeft(r, lambda);

nb += lambda; // Update the bit count for x.

var n = Math.ceil(nb / bitsPerDigit) - 1;

var b = RSAUtils.biMultiplyByRadixPower(y, n - t);

while (RSAUtils.biCompare(r, b) != -1) {

++q.digits[n - t];

r = RSAUtils.biSubtract(r, b);

}

for (var i = n; i > t; --i) {

var ri = (i >= r.digits.length) ? 0 : r.digits[i];

var ri1 = (i - 1 >= r.digits.length) ? 0 : r.digits[i - 1];

var ri2 = (i - 2 >= r.digits.length) ? 0 : r.digits[i - 2];

var yt = (t >= y.digits.length) ? 0 : y.digits[t];

var yt1 = (t - 1 >= y.digits.length) ? 0 : y.digits[t - 1];

if (ri == yt) {

q.digits[i - t - 1] = maxDigitVal;

} else {

q.digits[i - t - 1] = Math.floor((ri * biRadix + ri1) / yt);

}

var c1 = q.digits[i - t - 1] * ((yt * biRadix) + yt1);

var c2 = (ri * biRadixSquared) + ((ri1 * biRadix) + ri2);

while (c1 > c2) {

--q.digits[i - t - 1];

c1 = q.digits[i - t - 1] * ((yt * biRadix) | yt1);

c2 = (ri * biRadix * biRadix) + ((ri1 * biRadix) + ri2);

}

b = RSAUtils.biMultiplyByRadixPower(y, i - t - 1);

r = RSAUtils.biSubtract(r, RSAUtils.biMultiplyDigit(b, q.digits[i - t - 1]));

if (r.isNeg) {

r = RSAUtils.biAdd(r, b);

--q.digits[i - t - 1];

}

}

r = RSAUtils.biShiftRight(r, lambda);

// Fiddle with the signs and stuff to make sure that 0 <= r < y.

q.isNeg = x.isNeg != origYIsNeg;

if (x.isNeg) {

if (origYIsNeg) {

q = RSAUtils.biAdd(q, bigOne);

} else {

q = RSAUtils.biSubtract(q, bigOne);

}

y = RSAUtils.biShiftRight(y, lambda);

r = RSAUtils.biSubtract(y, r);

}

// Check for the unbelievably stupid degenerate case of r == -0.

if (r.digits[0] == 0 && RSAUtils.biHighIndex(r) == 0) r.isNeg = false;

return [q, r];

};

RSAUtils.biDivide = function(x, y) {

return RSAUtils.biDivideModulo(x, y)[0];

};

RSAUtils.biModulo = function(x, y) {

return RSAUtils.biDivideModulo(x, y)[1];

};

RSAUtils.biMultiplyMod = function(x, y, m) {

return RSAUtils.biModulo(RSAUtils.biMultiply(x, y), m);

};

RSAUtils.biPow = function(x, y) {

var result = bigOne;

var a = x;

while (true) {

if ((y & 1) != 0) result = RSAUtils.biMultiply(result, a);

y >>= 1;

if (y == 0) break;

a = RSAUtils.biMultiply(a, a);

}

return result;

};

RSAUtils.biPowMod = function(x, y, m) {

var result = bigOne;

var a = x;

var k = y;

while (true) {

if ((k.digits[0] & 1) != 0) result = RSAUtils.biMultiplyMod(result, a, m);

k = RSAUtils.biShiftRight(k, 1);

if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0) break;

a = RSAUtils.biMultiplyMod(a, a, m);

}

return result;

};

$w.BarrettMu = function(m) {

this.modulus = RSAUtils.biCopy(m);

this.k = RSAUtils.biHighIndex(this.modulus) + 1;

var b2k = new BigInt();

b2k.digits[2 * this.k] = 1; // b2k = b^(2k)

this.mu = RSAUtils.biDivide(b2k, this.modulus);

this.bkplus1 = new BigInt();

this.bkplus1.digits[this.k + 1] = 1; // bkplus1 = b^(k+1)

this.modulo = BarrettMu_modulo;

this.multiplyMod = BarrettMu_multiplyMod;

this.powMod = BarrettMu_powMod;

};

function BarrettMu_modulo(x) {

var $dmath = RSAUtils;

var q1 = $dmath.biDivideByRadixPower(x, this.k - 1);

var q2 = $dmath.biMultiply(q1, this.mu);

var q3 = $dmath.biDivideByRadixPower(q2, this.k + 1);

var r1 = $dmath.biModuloByRadixPower(x, this.k + 1);

var r2term = $dmath.biMultiply(q3, this.modulus);

var r2 = $dmath.biModuloByRadixPower(r2term, this.k + 1);

var r = $dmath.biSubtract(r1, r2);

if (r.isNeg) {

r = $dmath.biAdd(r, this.bkplus1);

}

var rgtem = $dmath.biCompare(r, this.modulus) >= 0;

while (rgtem) {

r = $dmath.biSubtract(r, this.modulus);

rgtem = $dmath.biCompare(r, this.modulus) >= 0;

}

return r;

}

function BarrettMu_multiplyMod(x, y) {

/*

x = this.modulo(x);

y = this.modulo(y);

*/

var xy = RSAUtils.biMultiply(x, y);

return this.modulo(xy);

}

function BarrettMu_powMod(x, y) {

var result = new BigInt();

result.digits[0] = 1;

var a = x;

var k = y;

while (true) {

if ((k.digits[0] & 1) != 0) result = this.multiplyMod(result, a);

k = RSAUtils.biShiftRight(k, 1);

if (k.digits[0] == 0 && RSAUtils.biHighIndex(k) == 0) break;

a = this.multiplyMod(a, a);

}

return result;

}

var RSAKeyPair = function(encryptionExponent, decryptionExponent, modulus) {

var $dmath = RSAUtils;

this.e = $dmath.biFromHex(encryptionExponent);

this.d = $dmath.biFromHex(decryptionExponent);

this.m = $dmath.biFromHex(modulus);

// We can do two bytes per digit, so

// chunkSize = 2 * (number of digits in modulus - 1).

// Since biHighIndex returns the high index, not the number of digits, 1 has

// already been subtracted.

this.chunkSize = 2 * $dmath.biHighIndex(this.m);

this.radix = 16;

this.barrett = new $w.BarrettMu(this.m);

};

RSAUtils.getKeyPair = function(encryptionExponent, decryptionExponent, modulus) {

return new RSAKeyPair(encryptionExponent, decryptionExponent, modulus);

};

if(typeof $w.twoDigit === 'undefined') {

$w.twoDigit = function(n) {

return (n < 10 ? "0" : "") + String(n);

};

}

// Altered by Rob Saunders (rob@robsaunders.net). New routine pads the

// string after it has been converted to an array. This fixes an

// incompatibility with Flash MX's ActionScript.

RSAUtils.encryptedString = function(key, s) {

var a = [];

var sl = s.length;

var i = 0;

while (i < sl) {

a[i] = s.charCodeAt(i);

i++;

}

while (a.length % key.chunkSize != 0) {

a[i++] = 0;

}

var al = a.length;

var result = "";

var j, k, block;

for (i = 0; i < al; i += key.chunkSize) {

block = new BigInt();

j = 0;

for (k = i; k < i + key.chunkSize; ++j) {

block.digits[j] = a[k++];

block.digits[j] += a[k++] << 8;

}

var crypt = key.barrett.powMod(block, key.e);

var text = key.radix == 16 ? RSAUtils.biToHex(crypt) : RSAUtils.biToString(crypt, key.radix);

result += text + " ";

}

return result.substring(0, result.length - 1); // Remove last space.

};

RSAUtils.decryptedString = function(key, s) {

var blocks = s.split(" ");

var result = "";

var i, j, block;

for (i = 0; i < blocks.length; ++i) {

var bi;

if (key.radix == 16) {

bi = RSAUtils.biFromHex(blocks[i]);

}

else {

bi = RSAUtils.biFromString(blocks[i], key.radix);

}

block = key.barrett.powMod(bi, key.d);

for (j = 0; j <= RSAUtils.biHighIndex(block); ++j) {

result += String.fromCharCode(block.digits[j] & 255,

block.digits[j] >> 8);

}

}

// Remove trailing null, if any.

if (result.charCodeAt(result.length - 1) == 0) {

result = result.substring(0, result.length - 1);

}

return result;

};

RSAUtils.setMaxDigits(130);

})(window);

Hello World!

Hello World!

Hello World!

Hello World!

function GetRequest(){

var url = location.search; //获取url中"?"符后的字串

var theRequest = new Object();

if (url.indexOf("?") != -1){

var str = url.substr(1);

strs = str.split("&");

for(var i = 0; i < strs.length; i ++){

theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);

}

}

return theRequest;

}

var Request = new Object();

Request = GetRequest();

var user;

user= Request['user'];

document.getElementById("user").innerHTML = user;

function sleep(numberMillis) {

var now = new Date();

var exitTime = now.getTime() + numberMillis;

while (true) {

now = new Date();

if (now.getTime() > exitTime)

return;

}

}

var exponent = '010001'

var modulus = '***********************************************'

document.getElementById("exponent").innerHTML = exponent;

document.getElementById("modulus").innerHTML = modulus;

RSAPUB_KEY = RSAUtils.getKeyPair(exponent,'',modulus);

enpassword = RSAUtils.encryptedString(RSAPUB_KEY,user);

document.getElementById("result").innerHTML = enpassword;

console.log(enpassword);

""")

#self.send_response('index.html');

#self.end_headers();

return

if __name__ == "__main__":

server = HTTPServer(('127.0.0.1', 9999), RequestHandler);

print "Starting server, use to stop";

server.serve_forever();

客户端发送get请求，把待加密信息作为参数传过来，python的webserver实现加密，并传回结果。

(ps. js代码本来想通过文件路径的方式调用，但是调试时出现报错，于是直接将代码拷到head里面了。直接调js文件路径的方式，不知道是否可行，待研究。。。)

但是这种方法，要保证server一直运行，实际使用中比较麻烦。

2 使用python的rsa第三方库实现rsa加密：

python能做rsa加密的库从网上搜到三种：PyCrypto，rsa，M2Crypto

因为我们从网站响应中只能拿到e和n两个值，需要通过(e，n)获取公钥。

发现PyCrypto和rsa有这种功能，M2Crypto 没有找到，加上M2Crypto 安装比较麻烦，就没有试。

使用使用PyCrypto加密：

import Crypto.PublicKey.RSA

from Crypto.PublicKey import RSA

#from Crypto.Cipher import PKCS1_OAEP

from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5

from Crypto.Signature import PKCS1_v1_5 as Signature_pkcs1_v1_5

from Crypto.Hash import SHA

import binascii

def rsaEncrypt1(str):

timespan = 1411093327735 - int(time.time())*1000;

rsakey = Crypto.PublicKey.RSA.construct((long(n,16),long(e,16))) #根据e,n生成publicKey

public_key = rsakey.publickey().exportKey()

with open('master-public.pem', 'w') as f:

f.write(public_key)

with open('master-public.pem') as f:

key = f.read()

rsakey = RSA.importKey(key)

cipher = Cipher_pkcs1_v1_5.new(rsakey)

crypto = cipher.encrypt(str)

en= binascii.b2a_hex(crypto)

print en

return en

rsaEncrypt1('12345678')

这种加密方式使用的padding方式(填充方式)是pkcs1_v1_5,同一字符串每次加密结果不一样，与js实现结果不符。

pyCrypto还支持一种填充方式，PKCS1_OAEP，试了下，也是同一字符串每次加密结果不一样

使用rsa库加密：

import rsa

def useRsaEn(str):

rsaPublickey = long(n, 16) #n为modulus

key = rsa.PublicKey(rsaPublickey, 65537) #65537 为e，一般等于010001

passwd = rsa.encrypt(str, key)

passwd = binascii.b2a_hex(passwd)

print passwd

return passwd

useRsaEn('12345566')

这种加密出来的结果也是相同字符串，结果不一样，猜测是用的pkcs1的填充方式。

相同字符串每次加密结果不一样，看网上的解释是填充方式采用的随机方式，如果结果每次一样，应该是使用的no padding模式。

至于js中相同字符串每次结果一样，应该使用的是no padding填充方式，手动在末尾做填充，而不是随机填充。

找了这两个库的文档，发现没有使用无填充加密的方法。

因此使用现成rsa库加密的方式行不通！

该不会只能读懂js代码再用python实现吧~~最后灵机一动，试试用python直接调用js代码是否可行。

3 python调用js函数实现rsa加密

python调用js的库真的有几个，选了个用的人比较多，安装不那么费劲的PyV8。windows直接下exe安装程序即可。

import PyV8

def usePyV8(message):

ctxt = PyV8.JSContext()

ctxt.__enter__()

js_file = open('security.js') #security.js在当前目录下

js_data = js_file.read()

js_file.close()

ctxt.eval(js_data)

rsaEn = ctxt.locals.rsaEn #rsaEn 为security.js中的function

ret=rsaEn(message) #message为rsaEn函数的入参

print ret

usePyV8('12345678')

经实验，发现确实可行！就是js代码需要稍做修改，比如： (function($w) {  })(window); 这种貌似不能识别，我把$w 这种都直接删掉了。

收获：

1、熟悉了rsa加密算法原理

2、熟悉了python webserver的实现

3、熟悉了python  rsa库的使用方法

4、熟悉了python调用js的方法

5、熟悉了chrome调试js的方法，对js语法理解更深入

最后还解决了问题，完美！