VB.NET

AES Encryption ECB Mode with PKCS7 Padding

See more Encryption Examples

Duplicates the following C# code:

public static byte[] DecryptBySymmetricKey(string encryptedText, byte[] key)
  {
     string keyAsBase64 = Convert.ToBase64String(key);

     byte[] dataToDecrypt = Convert.FromBase64String(encryptedText);
     var keyBytes = key;
     AesManaged tdes = new AesManaged();
     tdes.KeySize = 256;
     tdes.BlockSize = 128;
     tdes.Key = keyBytes;
     tdes.Mode = CipherMode.ECB;
     tdes.Padding = PaddingMode.PKCS7;
     ICryptoTransform decrypt__1 = tdes.CreateDecryptor();
     byte[] deCipher = decrypt__1.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);
     tdes.Clear();
     string EK_result = Convert.ToBase64String(deCipher);
     return EK_result;
}

VB.NET

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim crypt As New Chilkat.Crypt2

' In the C# code above that is to be duplicated here, use the base64 encoded key.
Dim keyAsBase64 As String = "..."
Dim encryptedBytesAsBase64 As String = "...."

crypt.KeyLength = 256
crypt.CryptAlgorithm = "AES"
crypt.CipherMode = "ecb"
crypt.PaddingScheme = 0
crypt.SetEncodedKey(keyAsBase64,"base64")

crypt.EncodingMode = "base64"

' Pass the base64 representation of the encrypted data.
' (The EncodingMode indicates you are passing base64.)
Dim EK_result As String = crypt.DecryptStringENC(encryptedBytesAsBase64)

Debug.WriteLine(EK_result)