等價於Java中的CryptoStream .NET？

Question

我在Visual Basic中有一個加密的字符串。 NET 2008年，加密和解密功能如下：

Imports System.Security.Cryptography 

Public Shared Function Encriptar(ByVal strValor As String) As String 
    Dim strEncrKey As String = "key12345" 
    Dim byKey() As Byte = {} 
    Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF} 
    Try 
     byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey) 
     Dim des As New DESCryptoServiceProvider 
     Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes(strValor) 
     Dim ms As New MemoryStream 
     Dim cs As New CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) 
     cs.Write(inputByteArray, 0, inputByteArray.Length) 
     cs.FlushFinalBlock() 
     Return Convert.ToBase64String(ms.ToArray()) 
    Catch ex As Exception 
     Return "" 
    End Try 
End Function 

Public Shared Function Desencriptar(ByVal strValor As String) As String 
    Dim sDecrKey As String = "key12345" 
    Dim byKey() As Byte = {} 
    Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF} 
    Dim inputByteArray(strValor.Length) As Byte 
    Try 
     byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey) 
     Dim des As New DESCryptoServiceProvider 
     If Trim(strValor).Length = 0 Then 
      Throw New Exception("Password No debe estar en Blanco") 
     End If 
     inputByteArray = Convert.FromBase64String(strValor) 
     Dim ms As New MemoryStream 
     Dim cs As New CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write) 
     cs.Write(inputByteArray, 0, inputByteArray.Length) 
     cs.FlushFinalBlock() 
     Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8 
     Return encoding.GetString(ms.ToArray(), 0, ms.ToArray.Count) 
    Catch ex As Exception 
     Return "" 
    End Try 
End Function 

例如單詞「機器人」這個函數加密給我結果「B3xogi/Qfsc =」

現在我需要解密字符串「B3xogi/Qfsc =」它來自java，由相同的鍵，這是「key12345」，結果應該是「android」...任何人都知道如何做到這一點？

在此先感謝。

Answer 1

使用Apache共享編解碼器十六進制和base64編碼/解碼，可以使用下面的代碼：

KeySpec ks = new DESKeySpec("key12345".getBytes("UTF-8")); 
SecretKey key = SecretKeyFactory.getInstance("DES").generateSecret(ks); 

IvParameterSpec iv = new IvParameterSpec(
     Hex.decodeHex("1234567890ABCDEF".toCharArray())); 

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); 
cipher.init(Cipher.DECRYPT_MODE, key, iv); 

byte[] decoded = cipher.doFinal(Base64.decodeBase64("B3xogi/Qfsc=")); 

System.out.println("Decoded: " + new String(decoded, "UTF-8")); 

Answer 2

您正在使用DES加密。

這裏是一個關於如何encrypt and decrypt with DES的例子。

重點是創建一個SecretKey，Cipher使用它，並解密您的字符串與它。

Mmmh ...

我發現another article可能最適合您的問題，因爲它使用IVBytes :)

Answer 3

最接近的Java類到.NET的CryptoStream類是CipherInputStream和CipherOutputStream類。

Answer 4

public String encryptText(String cipherText) throws Exception { 

    String plainKey = "key12345"; 
    String plainIV = "1234567890ABCDEF"; 

    KeySpec ks = new DESKeySpec(plainKey.getBytes(encodingType)); 
    SecretKey key = SecretKeyFactory.getInstance(keyDes).generateSecret(ks); 

    IvParameterSpec iv = new IvParameterSpec(
      org.apache.commons.codec.binary.Hex.decodeHex(plainIV.toCharArray())); 

    Cipher cipher = Cipher.getInstance(encryptAlgo); 
    cipher.init(Cipher.ENCRYPT_MODE, key, iv); 

    byte[] decoded = cipher.doFinal(cipherText.getBytes(encodingType)); 

    return new Base64().encodeToString(decoded); 
}