我正在尝试使用.NET中的javascript库SlowAES和RijndaelManaged类来设置AES加密/解密。
我在阅读this post之后选择了这种方法,其中Cheeso设法让这两种加密方法一起玩
“在我的测试中 COM-wrapped-SlowAEs,我使用CBC模式, 加密完全是 与RijndaelManaged兼容 .NET中的类“ - Cheeso
我从Cheeso的Windows Scripting Component,最新的slowaes库中获取了javascript代码,并使用以下javascript脚本进行测试:
var key = "12345678901234567890123456789012";
var message = "watson?";
var decrypted;
slowAES.aes.keySize.SIZE_256;
slowAES.modeOfOperation.CBC;
put_PassPhrase(key);
var result = EncryptString(message);
decrypted = DecryptCommaDelimitedStringToString(result)
document.write("Key:" + key + "<br />original:" + message + "<br />Cypher:" + result + "<br />Decrypted:" + decrypted + "<br />IV(): " + get_IV());
我得到以下输出:
Key:12345678901234567890123456789012
original:watson?
Cypher:245,159,1,1,168,1,1,143,1,1,146,1,1,239,117,1
Decrypted:watson?
IV(): 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
我修改了以下示例找到on MSDN以尝试匹配C#中的加密:
public static void Main()
{
try
{
string original = "watson?";
byte[] IV = new byte[16]; // match slowaes IV
byte[] key = new System.Text.ASCIIEncoding().GetBytes("12345678901234567890123456789012");// match slowaes KEY
RijndaelManaged myRijndael = new RijndaelManaged();
myRijndael.BlockSize = 128;
myRijndael.KeySize = 256;
myRijndael.Mode = CipherMode.CBC;
// Encrypt the string to an array of bytes.
byte[] encrypted = encryptStringToBytes_AES(original, key, IV);
// Decrypt the bytes to a string.
string roundtrip = decryptStringFromBytes_AES(encrypted, key, IV);
//Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
}
}
观察字节数组:
- encrypted {byte[16]} byte[]
[0] 139 byte
[1] 104 byte
[2] 166 byte
[3] 35 byte
[4] 8 byte
[5] 42 byte
[6] 216 byte
[7] 160 byte
[8] 235 byte
[9] 153 byte
[10] 23 byte
[11] 143 byte
[12] 105 byte
[13] 3 byte
[14] 24 byte
[15] 255 byte
我已经尝试了托管.NET类的所有填充选项,但是我无法获得匹配的加密输出。任何人都可以帮助我吗?
谢谢,
鲍勃
答案 0 :(得分:37)
我拿了你的C#代码并稍加修改。我使用的C#代码完全是:
using System;
using System.Security.Cryptography;
public class Bob
{
internal static string FormatByteArray(byte[] b)
{
System.Text.StringBuilder sb1 = new System.Text.StringBuilder();
int i = 0;
for (i = 0; i < b.Length; i++)
{
if (i != 0 && i % 16 == 0)
sb1.Append("\n");
sb1.Append(System.String.Format("{0:X2} ", b[i]));
}
return sb1.ToString();
}
public static void Main()
{
try
{
string original = "watson?";
Console.WriteLine("Original: {0}", original);
byte[] IV = new byte[16]; // match slowaes IV
var ascii = new System.Text.ASCIIEncoding();
// match slowaes KEY
string passPhrase = "12345678901234567890123456789012";
byte[] key = ascii.GetBytes(passPhrase);
RijndaelManaged myRijndael = new RijndaelManaged();
myRijndael.BlockSize = 128;
myRijndael.KeySize = 256;
myRijndael.IV = IV;
myRijndael.Padding = PaddingMode.PKCS7;
myRijndael.Mode = CipherMode.CBC;
myRijndael.Key = key;
// Encrypt the string to an array of bytes.
byte[] plainText = new System.Text.ASCIIEncoding().GetBytes(original);
ICryptoTransform transform = myRijndael.CreateEncryptor();
byte[] cipherText = transform.TransformFinalBlock(plainText, 0, plainText.Length);
Console.WriteLine("cipherText: {0}", FormatByteArray(cipherText));
// Decrypt the bytes to a string.
transform = myRijndael.CreateDecryptor();
plainText = transform.TransformFinalBlock(cipherText, 0, cipherText.Length);
string roundtrip = ascii.GetString(plainText);
Console.WriteLine("Round Trip: {0}", roundtrip);
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
}
}
}
用
编译上面的内容csc.exe /target:exe /out:Bob.exe Bob.cs
我使用你引用的其他帖子中的slowAES.wsc,有2个更改:我没有为EncryptString或DecryptString()方法中的键调用getPaddedBlock()。这真的需要一个PBKDF,但现在不要担心。这是修改后的EncryptString的样子:
function EncryptString(plainText)
{
// this is really wrong - need a PBBKDF to get the key, instead
// of just using the passphrase
var key = cryptoHelpers.convertStringToByteArray(_passphrase);
// var nkey = slowAES.getPaddedBlock(key, 0, _keysize, _mode);
var bytesToEncrypt = cryptoHelpers.convertStringToByteArray(plainText);
var result = slowAES.encrypt(bytesToEncrypt,
_mode,
key,
_keysize,
_iv);
return result['cipher'];
}
这意味着您必须使用完全密钥大小所需长度的passPhrase。如果使用AES256,则传递32个字符串(32 * 8 = 256位)。好像你已经想到了这一点。
WSC组件的客户端也是Javascript(尽管它可以是任何COM语言)。这是我用的。
function toHexString(a)
{
var ret = '';
for(var i = 0;i < a.length;i++)
ret += (a[i] < 16 ? '0' : '') + a[i].toString(16) + ' ';
return ret.toLowerCase();
}
//var plaintext = "Hello. This is a test. of the emergency broadcasting system.";
var plaintext = "watson?";
try
{
WScript.echo( "plaintext: " + plaintext);
WScript.echo( "plaintext.length: " + plaintext.length);
WScript.echo( "instantiate ");
var aes = new ActiveXObject("Ionic.Com.SlowAES");
WScript.echo( "keysize ");
aes.KeySize = 256;
WScript.echo( "passphrase ");
aes.PassPhrase= "12345678901234567890123456789012"; // 32 chars long
WScript.echo( "mode ");
aes.Mode = "CBC";
WScript.echo( "encrypting... ");
var result = aes.EncryptString(plaintext);
WScript.echo( "Cryptotext: " + toHexString(result));
WScript.echo( "decrypting... ");
var decrypted = aes.DecryptBytesToString(result);
WScript.echo( "decrypted: " + decrypted);
}
catch(e)
{
WScript.echo("Exception: " + e);
// WScript.echo(e.Number + ": " + e.Name);
WScript.echo(e.Message);
}
如果我然后运行此代码,Javascript和C#使用AES256,密码为12345678901234567890123456789012,以及16字节零的IV,为“watson?”的明文生成相同的密文。生成的密文是:
8B 68 A6 23 08 2A D8 A0 EB 99 17 8F 69 03 18 FF
它在两种情况下都成功解密。
编辑:虽然我在一个WSC中打包了slowAES加密,但它也可以在COM环境之外运行。 WSC部分对于这个问题是不必要的,但是有必要证明先前问题的答案,即“how can I get VBScript and .NET AES to interoperate?”
EDIT2 :演示Javascript或VBScript与.NET is available之间的AES互操作的源代码。我扩展了这里给出的基本示例,以3种语言生成测试应用程序:C#,Javascript和VBScript。他们都采取相同的论点。它们每个都使用符合RFC2898的密钥派生函数。您可以指定密码,salt,IV和纯文本,以及要在PBKDF2中使用的RFC2898迭代次数。您可以轻松验证每个测试程序的密文是否相同。也许这个例子对某人有用。
<强> EDIT3 强>
好读:Javascript Cryptography considered harmful.