Question

我必须做以下操作：

加密VB - ＆gt;解密VB
加密Android - 解密Android
加密VB - ＆gt;解密Android
加密Android - ＆gt;解密VB

到目前为止，我已成功在Android上进行加密和解密。当我在VB中加密并尝试在Android上解密时，我得到以下异常：

E / Exception：pad block corrupted

我还要提到，当我在VB中加密短字符串并在VB中解密它们时，一切都运行良好。但是当我加密更大的字节数组时，解密会起作用，但结果不是预期的结果。

有人可以给我一些如何解决问题的提示吗？谢谢！

这是我的代码：

.NET函数

Public Function AES_Encrypt2(ByVal byteArray() As Byte, ByVal key As String, Optional ByVal ShortKey As Boolean = False) As String
    Try

        Dim FirstKeyBytes() As Byte = Encoding.UTF8.GetBytes(key)

        If Not FirstKeyBytes Is Nothing Then
            If FirstKeyBytes.Length < 32 Then
                Array.Resize(FirstKeyBytes, 32)
            End If
        End If

        Dim KeyBytes() As Byte
        If ShortKey Then
            KeyBytes = New Byte(15) {}
            Array.Copy(FirstKeyBytes, KeyBytes, 16)

        Else
            KeyBytes = New Byte(31) {}
            Array.Copy(FirstKeyBytes, KeyBytes, 32)

        End If

        Dim InitialVectorBytes() As Byte = New Byte() {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 'Encoding.UTF8.GetBytes("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")
        Dim SymmetricKey As New RijndaelManaged()

        SymmetricKey.Mode = CipherMode.CBC
        SymmetricKey.Padding = PaddingMode.PKCS7

        Dim Encryptor As ICryptoTransform = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes)
        Dim MemStream As New MemoryStream()
        Dim CryptoStream As New CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write)

        CryptoStream.Write(byteArray, 0, byteArray.Length)
        CryptoStream.FlushFinalBlock()
        MemStream.Close()
        CryptoStream.Close()

        Dim CipherTextBytes As Byte() = MemStream.ToArray()
        Dim encryptedString As String = Convert.ToBase64String(CipherTextBytes)

        Return encryptedString
    Catch ex As Exception
        Return String.Empty
    End Try
End Function



Public Function AES_Decrypt2(ByVal encryptedString As String, ByVal key As String, Optional ByVal ShortKey As Boolean = False) As String
    Try

        Dim PlainTextBytes1 As Byte() = Convert.FromBase64String(encryptedString)
        Dim FirstKeyBytes() As Byte = Encoding.UTF8.GetBytes(key)

        If Not FirstKeyBytes Is Nothing Then
            If FirstKeyBytes.Length < 32 Then
                Array.Resize(FirstKeyBytes, 32)
            End If
        End If

        Dim KeyBytes() As Byte
        If ShortKey Then
            KeyBytes = New Byte(15) {}
            Array.Copy(FirstKeyBytes, KeyBytes, 16)

        Else
            KeyBytes = New Byte(31) {}
            Array.Copy(FirstKeyBytes, KeyBytes, 32)

        End If


        Dim SymmetricKey As New RijndaelManaged()
        Dim InitialVectorBytes As Byte() = New Byte() {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 'Encoding.UTF8.GetBytes("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")

        SymmetricKey.Mode = CipherMode.CBC
        SymmetricKey.Padding = PaddingMode.PKCS7

        Dim Decryptor As ICryptoTransform = SymmetricKey.CreateDecryptor(KeyBytes, InitialVectorBytes)
        Dim MemStream1 As New MemoryStream(PlainTextBytes1)
        Dim CryptoStream As New CryptoStream(MemStream1, Decryptor, CryptoStreamMode.Read)
        Dim pltxt As Byte() = New Byte(PlainTextBytes1.Length - 1) {}
        Dim d As Integer = CryptoStream.Read(pltxt, 0, pltxt.Length)

        MemStream1.Close()
        CryptoStream.Close()

        Dim textConverter As New ASCIIEncoding()
        Dim round As String = textConverter.GetString(pltxt, 0, d)

        Return round

    Catch ex As Exception
        Return String.Empty
    End Try
End Function

Android方法：

public static String encrypt(byte[] input, String key) {
    try {
        byte[] iv = new byte[16];

        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);

        String newKey = "";
        if (key.length() >= 32) {
            newKey = key.substring(0, 32);
        } else {
            for (int i = key.length(); i < 32; i++) {
                key += "0";
            }
            newKey = key.substring(0, 32);
        }

        SecretKeySpec skeySpec = new SecretKeySpec(newKey.getBytes(), "AES");
        //skeySpec = new SecretKeySpec(newKey.getBytes(), 0, newKey.length(),  "AES");
        Cipher fileCipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

        fileCipher.init(1, skeySpec, paramSpec);

        byte[] decrypted = fileCipher.doFinal(input);

        byte[] base64enc = Base64.encode(decrypted, 0);

        return new String(base64enc);
    } catch (Exception e) {
        Log.e("Exception", e.getMessage());
    }
    return null;
}

public static byte[] decrypt(String input, String key) {
    try {
        byte[] iv = new byte[16];

        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);

        byte[] base64enc = Base64.decode(input.getBytes(), 0);

        String newKey = "";
        if (key.length() >= 32) {
            newKey = key.substring(0, 32);
        } else {
            for (int i = key.length(); i < 32; i++) {
                key += "0";
            }
            newKey = key.substring(0, 32);;
        }

        SecretKeySpec skeySpec = new SecretKeySpec(newKey.getBytes(), "AES");
        Cipher fileCipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

        fileCipher.init(2, skeySpec, paramSpec);

        int x = base64enc.length;

        return fileCipher.doFinal(base64enc);

    } catch (Exception e) {
        Log.e("Exception: ", e.getMessage());
    }
    return null;
}

Answer 1

我猜主要的问题是密钥生成在两段代码中都是不同的。密码不是密钥，您应该使用二进制，随机生成的密钥或良好的密钥派生机制，如PBKDF2。

试图找到经过良好审核的lib。在.NET和Java（/ Android）中使用相同的加密协议也是一个好主意。

通常，加密算法的输入必须是二进制的。在执行算法之前，请务必使用十六进制编码比较算法的所有输入。

Pad Block已损坏

1 个答案: