(PowerBuilder) AES 256-bit CBC using PBKDF2 Generated Secret Key

See more Encryption Examples

First generates a 32-byte secret key using PBKDF2 (with HMAC-SHA256), and then uses the secret key to do 256-bit AES CBC mode decryption.

(Duplicates the following Java code)

public String decrypt(String strToDecrypt) {
        try  {
            // Read the initialization vector from the first bytes for the data
            byte [] rawData = Base64.getDecoder().decode(strToDecrypt);
            byte [] iv = new byte[Config.get().encryptionIVLength()];
            byte [] encryptedData = new byte[rawData.length - iv.length];
            System.arraycopy(rawData, 0, iv, 0, iv.length);
            System.arraycopy(rawData, iv.length, encryptedData, 0, encryptedData.length);
 
            IvParameterSpec ivspec = new IvParameterSpec(iv);
 
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
            KeySpec spec = new PBEKeySpec(secretKey.toCharArray(), salt.getBytes(), 65536, 256);
            SecretKey tmp = factory.generateSecret(spec);
            SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");
 
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec);
            return new String(cipher.doFinal(encryptedData));
        }
        catch (Exception e) {
            log.error("Could not decrypt the string.", e);
        }
        return null;
    }

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Crypt
string ls_Password
string ls_SaltHex
integer li_IterationCount
integer li_OutputKeyBitLen
string ls_SecretKeyHex
string ls_Iv
string ls_StrToDecrypt
string ls_DecryptedStr

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

loo_Crypt = create oleobject
// Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")
if li_rc < 0 then
    destroy loo_Crypt
    MessageBox("Error","Connecting to COM object failed")
    return
end if

ls_Password = "some arbitrary length password"
// We have 8 bytes of salt encoded using hex.
// (The salt can be any number of bytes, in any desired encoding such as base64, hex, etc.)
ls_SaltHex = "0102030405060708"

// Generate the 256-bit (32-byte) AES secret key we'll use to decrypt.
li_IterationCount = 65536
li_OutputKeyBitLen = 256
ls_SecretKeyHex = loo_Crypt.Pbkdf2(ls_Password,"utf-8","sha256",ls_SaltHex,li_IterationCount,li_OutputKeyBitLen,"hex")

// Setup for 256-bit AES CBC decryption.
loo_Crypt.CryptAlgorithm = "aes"
loo_Crypt.KeyLength = 256
loo_Crypt.CipherMode = "cbc"
loo_Crypt.PaddingScheme = 0

// The IV for AES is 16 bytes.
ls_Iv = "000102030405060708090A0B0C0D0E0F"
loo_Crypt.SetEncodedIV(ls_Iv,"hex")

// Set the secret key for 256-bit AES.
loo_Crypt.SetEncodedKey(ls_SecretKeyHex,"hex")

// AES decrypt
// assume our string to decrypt is base64
ls_StrToDecrypt = "...."
loo_Crypt.EncodingMode = "base64"
ls_DecryptedStr = loo_Crypt.DecryptStringENC(ls_StrToDecrypt)

Write-Debug ls_DecryptedStr


destroy loo_Crypt