How to decrypt EncryptedAssertion manually

Question

I want to decrypt the EncryptedAssertion. I tried with OpenSaml Decrypter but its not working for me.I am getting Failed to decrypt EncryptedData I have already ask that questio

Answer 1

    public static byte[] decrypt(byte[] cryptoBytes, byte[] aesSymKey)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
        InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
    // https://github.com/onelogin/java-saml/issues/23
    String cipherMethod = "AES/CBC/ISO10126Padding"; // This should be derived from Cryptic Saml

    AlgorithmParameterSpec iv = new IvParameterSpec(cryptoBytes, 0, 16);
    
    // Strip off the the first 16 bytes because those are the IV
    byte[] cipherBlock = Arrays.copyOfRange(cryptoBytes,16, cryptoBytes.length);
            
    // Create a secret key based on symKey
    SecretKeySpec secretSauce = new SecretKeySpec(aesSymKey, "AES");

    // Now we have all the ingredients to decrypt
    Cipher cipher = Cipher.getInstance(cipherMethod);
    cipher.init(Cipher.DECRYPT_MODE, secretSauce, iv);

    // Do the decryption
    byte[] decrypedBytes = cipher.doFinal(cipherBlock);
    return decrypedBytes;
}

ISO10126Padding should work....