Equivalent to CryptoStream .NET in Java?

[Abhijeet Sinha]

I have an encrypted string in visual basic. NET 2008, the function to decrypt is ::

private static string Decrypt(string encryptedText, string completeEncodedKey, int keySize)
	    {
	        RijndaelManaged aesEncryption = new RijndaelManaged();
	        aesEncryption.KeySize = keySize;
	        aesEncryption.BlockSize = 128;
	        aesEncryption.Mode = CipherMode.CBC;
	        aesEncryption.Padding = PaddingMode.PKCS7;
	        aesEncryption.IV = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]);
	        aesEncryption.Key = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]);
	        ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
	        byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
	        return ASCIIEncoding.UTF8.GetString(decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length));
	    }

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now I need to decrypt from java... anyone know how to do this??

Thanks!!

[Richard Tookey]

Matching that decryption is very easy in Java using the JCE ( http://docs.oracle.com/javase/1.5.0/docs/guide/security/CryptoSpec.html ) . If you have worked with cryptography before then you will find the specification enough but if not then you would do well to buy a book. A good introduction is given in "Beginning Cryptography with Java" written by David Hook published by Wrox.

Note - for the work you are doing PKCS7 padding is equivalent to PKCS5 padding and you should specify PKCS5Padding when creating the Cipher object.