[英]AES round trip producing random chars
So here's my mess. 所以这是我的烂摊子。 It returns random Unicode chars.
它返回随机的Unicode字符。 I'm having it use the same key for both methods, as well as the same IV, and I'm using the same encoding for both of them.
我对两种方法使用相同的键,对IV使用相同的键,并且对两种方法使用相同的编码。 What's causing the random response?
是什么导致随机响应?
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace FileFish
{
class Program
{
public static void Main()
{
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
aes.GenerateIV();
Console.WriteLine(Decrypt(Encoding.UTF8.GetBytes("APPLEAPPLEAPPLEAPPLEAPPLEAPPLEAP"), aes.IV, Encrypt(Encoding.UTF8.GetBytes("APPLEAPPLEAPPLEAPPLEAPPLEAPPLEAP"), aes.IV, "cheese")));
Console.ReadKey(true);
}
private static byte[] Encrypt(byte[] key, byte[] iv, string plaintext)
{
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
aes.Key = key;
aes.IV = iv;
ICryptoTransform encryptor = aes.CreateEncryptor();
MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(new CryptoStream(ms, encryptor, CryptoStreamMode.Write));
sw.Write(plaintext);
return ms.ToArray();
}
private static string Decrypt(byte[] key, byte[] iv, byte[] ciphertext)
{
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
aes.Key = key;
aes.IV = iv;
ICryptoTransform decryptor = aes.CreateEncryptor();
MemoryStream ms = new MemoryStream(ciphertext);
StreamReader sr = new StreamReader(new CryptoStream(ms, decryptor, CryptoStreamMode.Read));
return sr.ReadToEnd();
}
}
}
Your code sample is failing because the Encrypt
method returns an empty array. 您的代码示例失败,因为
Encrypt
方法返回一个空数组。 Rather than trying to roll it yourself, you'd be better off using something that is proven to work. 与其尝试自己动手制作,不如使用经验证有效的工具,更好。
The example from the AesCryptoServiceProvider
documentation works in place of your Encrypt
and Decrypt
methods from your sample code: AesCryptoServiceProvider
文档中的示例代替了示例代码中的Encrypt
和Decrypt
方法:
static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an AesCryptoServiceProvider object
// with the specified key and IV.
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an AesCryptoServiceProvider object
// with the specified key and IV.
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
Also, not that it's the cause of this problem, but: http://blogs.msdn.com/b/shawnfa/archive/2005/11/10/491431.aspx 另外,不是这是导致此问题的原因,而是: http : //blogs.msdn.com/b/shawnfa/archive/2005/11/10/491431.aspx
Don't Roundtrip Ciphertext Via a String Encoding
不要通过字符串编码来回密文
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