加解密代码
package
{
import flash.display.Shape;
import flash.display.Sprite;
import flash.utils.ByteArray;
public class Test extends Sprite {
public function Test() {
var dataStr:String = "Today's weather is good.";
var data:ByteArray = new ByteArray();
data.writeMultiByte(dataStr, "utf-8");
var keyStr:String = "abcxyz123";
var key:ByteArray = new ByteArray();
key.writeMultiByte(keyStr, "utf-8");
trace("data:", dataStr);
trace("key:", keyStr);
//加密
var encryptData:ByteArray = XXTEA.encrypt(data, key);
var content:String = Base64.encodeByteArray(encryptData);
trace("encode: " + content);
//解密
encryptData = Base64.decodeToByteArray(content);
var sourceBtyes:ByteArray = XXTEA.decrypt(encryptData, key);
var sourceStr:String = sourceBtyes.toString();
trace("decode: " + sourceStr );
}
}
}
XXTEA加解密用到了Base64，以下是XXTEA和Base64的代码
XXTEA的代码
package
{
import flash.utils.ByteArray;
import flash.utils.Endian;
public class XXTEA {
private static const delta:uint = uint(0x9E3779B9);
private static function LongArrayToByteArray(data:Array, includeLength:Boolean):ByteArray {
var length:uint = data.length;
var n:uint = (length - 1) << 2;
if (includeLength) {
var m:uint = data[length - 1];
if ((m < n - 3) || (m > n)) {
return null;
}
n = m;
}
var result:ByteArray = new ByteArray();
result.endian = Endian.LITTLE_ENDIAN;
for (var i:uint = 0; i < length; i++) {
result.writeUnsignedInt(data[i]);
}
if (includeLength) {
result.length = n;
return result;
}
else {
return result;
}
}
private static function ByteArrayToLongArray(data:ByteArray, includeLength:Boolean):Array {
var length:uint = data.length;
var n:uint = length >> 2;
if (length % 4 > 0) {
n++;
data.length += (4 - (length % 4));
}
data.endian = Endian.LITTLE_ENDIAN;
data.position = 0;
var result:Array = [];
for (var i:uint = 0; i < n; i++) {
result[i] = data.readUnsignedInt();
}
if (includeLength) {
result[n] = length;
}
data.length = length;
return result;
}
public static function encrypt(data:ByteArray, key:ByteArray):ByteArray {
if (data.length == 0) {
return new ByteArray();
}
var v:Array = ByteArrayToLongArray(data, true);
var k:Array = ByteArrayToLongArray(key, false);
if (k.length < 4) {
k.length = 4;
}
var n:uint = v.length - 1;
var z:uint = v[n];
var y:uint = v[0];
var mx:uint;
var e:uint;
var p:uint;
var q:uint = uint(6 + 52 / (n + 1));
var sum:uint = 0;
while (0 < q--) {
sum = sum + delta;
e = sum >>> 2 & 3;
for (p = 0; p < n; p++) {
y = v[p + 1];
mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);
z = v[p] = v[p] + mx;
}
y = v[0];
mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);
z = v[n] = v[n] + mx;
}
return LongArrayToByteArray(v, false);
}
public static function decrypt(data:ByteArray, key:ByteArray):ByteArray {
if (data.length == 0) {
return new ByteArray();
}
var v:Array = ByteArrayToLongArray(data, false);
var k:Array = ByteArrayToLongArray(key, false);
if (k.length < 4) {
k.length = 4;
}
var n:uint = v.length - 1;
var z:uint = v[n - 1];
var y:uint = v[0];
var mx:uint;
var e:uint;
var p:uint;
var q:uint = uint(6 + 52 / (n + 1));
var sum:uint = q * delta;
while (sum != 0) {
e = sum >>> 2 & 3;
for (p = n; p > 0; p--) {
z = v[p - 1];
mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);
y = v[p] = v[p] - mx;
}
z = v[n];
mx = (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);
y = v[0] = v[0] - mx;
sum = sum - delta;
}
return LongArrayToByteArray(v, true);
}
}
}
Base64的代码
package
{
import flash.utils.ByteArray;
public class Base64 {
private static const BASE64_CHARS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
public static const version:String = "1.0.0";
public static function encode(data:String):String {
// Convert string to ByteArray
var bytes:ByteArray = new ByteArray();
bytes.writeUTFBytes(data);
// Return encoded ByteArray
return encodeByteArray(bytes);
}
public static function encodeByteArray(data:ByteArray):String {
// Initialise output
var output:String = "";
// Create data and output buffers
var dataBuffer:Array;
var outputBuffer:Array = new Array(4);
// Rewind ByteArray
data.position = 0;
// while there are still bytes to be processed
while (data.bytesAvailable > 0) {
// Create new data buffer and populate next 3 bytes from data
dataBuffer = new Array();
for (var i:uint = 0; i < 3 && data.bytesAvailable > 0; i++) {
dataBuffer[i] = data.readUnsignedByte();
}
// Convert to data buffer Base64 character positions and
// store in output buffer
outputBuffer[0] = (dataBuffer[0] & 0xfc) >> 2;
outputBuffer[1] = ((dataBuffer[0] & 0x03) << 4) | ((dataBuffer[1]) >> 4);
outputBuffer[2] = ((dataBuffer[1] & 0x0f) << 2) | ((dataBuffer[2]) >> 6);
outputBuffer[3] = dataBuffer[2] & 0x3f;
// If data buffer was short (i.e not 3 characters) then set
// end character indexes in data buffer to index of '=' symbol.
// This is necessary because Base64 data is always a multiple of
// 4 bytes and is basses with '=' symbols.
for (var j:uint = dataBuffer.length; j < 3; j++) {
outputBuffer[j + 1] = 64;
}
// Loop through output buffer and add Base64 characters to
// encoded data string for each character.
for (var k:uint = 0; k < outputBuffer.length; k++) {
output += BASE64_CHARS.charAt(outputBuffer[k]);
}
}
// Return encoded data
return output;
}
public static function decode(data:String):String {
// Decode data to ByteArray
var bytes:ByteArray = decodeToByteArray(data);
// Convert to string and return
return bytes.readUTFBytes(bytes.length);
}
public static function decodeToByteArray(data:String):ByteArray {
// Initialise output ByteArray for decoded data
var output:ByteArray = new ByteArray();
// Create data and output buffers
var dataBuffer:Array = new Array(4);
var outputBuffer:Array = new Array(3);
// While there are data bytes left to be processed
for (var i:uint = 0; i < data.length; i += 4) {
// Populate data buffer with position of Base64 characters for
// next 4 bytes from encoded data
for (var j:uint = 0; j < 4 && i + j < data.length; j++) {
dataBuffer[j] = BASE64_CHARS.indexOf(data.charAt(i + j));
}
// Decode data buffer back into bytes
outputBuffer[0] = (dataBuffer[0] << 2) + ((dataBuffer[1] & 0x30) >> 4);
outputBuffer[1] = ((dataBuffer[1] & 0x0f) << 4) + ((dataBuffer[2] & 0x3c) >> 2);
outputBuffer[2] = ((dataBuffer[2] & 0x03) << 6) + dataBuffer[3];
// Add all non-padded bytes in output buffer to decoded data
for (var k:uint = 0; k < outputBuffer.length; k++) {
if (dataBuffer[k+1] == 64) break;
output.writeByte(outputBuffer[k]);
}
}
// Rewind decoded data ByteArray
output.position = 0;
// Return decoded data
return output;
}
public function Base64() {
throw new Error("Base64 class is static container only");
}
}
}
以下是Python代码
xxtea.py
import struct
_DELTA = 0x9E3779B9
def _long2str(v, w):
n = (len(v) - 1) << 2
if w:
m = v[-1]
if (m < n - 3) or (m > n): return ''
n = m
s = struct.pack('<%iL' % len(v), *v)
return s[0:n] if w else s
def _str2long(s, w):
n = len(s)
m = (4 - (n & 3) & 3) + n
s = s.ljust(m, "\0")
v = list(struct.unpack('<%iL' % (m >> 2), s))
if w: v.append(n)
return v
def encrypt(str, key):
if str == '': return str
v = _str2long(str, True)
k = _str2long(key.ljust(16, "\0"), False)
n = len(v) - 1
z = v[n]
y = v[0]
sum = 0
q = 6 + 52 // (n + 1)
while q > 0:
sum = (sum + _DELTA) & 0xffffffff
e = sum >> 2 & 3
for p in xrange(n):
y = v[p + 1]
v[p] = (v[p] + ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z))) & 0xffffffff
z = v[p]
y = v[0]
v[n] = (v[n] + ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum ^ y) + (k[n & 3 ^ e] ^ z))) & 0xffffffff
z = v[n]
q -= 1
return _long2str(v, False)
def decrypt(str, key):
if str == '': return str
v = _str2long(str, False)
k = _str2long(key.ljust(16, "\0"), False)
n = len(v) - 1
z = v[n]
y = v[0]
q = 6 + 52 // (n + 1)
sum = (q * _DELTA) & 0xffffffff
while (sum != 0):
e = sum >> 2 & 3
for p in xrange(n, 0, -1):
z = v[p - 1]
v[p] = (v[p] - ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z))) & 0xffffffff
y = v[p]
z = v[n]
v[0] = (v[0] - ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum ^ y) + (k[0 & 3 ^ e] ^ z))) & 0xffffffff
y = v[0]
sum = (sum - _DELTA) & 0xffffffff
return _long2str(v, True)
测试test.py
# -*- coding: utf-8 -*-
if __name__ == "__main__":
import xxtea, base64
data = "Today's weather is good."
key = "abcxyz123"
#加密
s = xxtea.encrypt(data, key)
s = base64.b64encode(s)
print '加密后:' + repr(s)
#解密
s = base64.b64decode(s)
s = xxtea.decrypt(s, key)
print repr(s)