PureBasic

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;
}

PureBasic

IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

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

    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; In the C# code above that is to be duplicated here, use the base64 encoded key.
    keyAsBase64.s = "..."
    encryptedBytesAsBase64.s = "...."

    CkCrypt2::setCkKeyLength(crypt, 256)
    CkCrypt2::setCkCryptAlgorithm(crypt, "AES")
    CkCrypt2::setCkCipherMode(crypt, "ecb")
    CkCrypt2::setCkPaddingScheme(crypt, 0)
    CkCrypt2::ckSetEncodedKey(crypt,keyAsBase64,"base64")

    CkCrypt2::setCkEncodingMode(crypt, "base64")

    ; Pass the base64 representation of the encrypted data.
    ; (The EncodingMode indicates you are passing base64.)
    EK_result.s = CkCrypt2::ckDecryptStringENC(crypt,encryptedBytesAsBase64)

    Debug EK_result


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure