Java Security

h3. Hello all,
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I have a AES Encryption util class in C# code. I want to convert the same to Java code with all Parameters.I am sure that somebody did it already.
Can any one can please give me the code for that.Thanks in advance........{color}

#region Usings
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
#endregion

    /// <summary>
    /// Utility class that handles encryption
    /// </summary>
    public static class AESEncryption
    {
        #region Static Functions
        /// <summary>
        /// Encrypts a string
        /// </summary>
        /// <param name="PlainText">Text to be encrypted</param>
        /// <param name="Password">Password to encrypt with</param>
        /// <param name="Salt">Salt to encrypt with</param>
        /// <param name="HashAlgorithm">Can be either SHA1 or MD5</param>
        /// <param name="PasswordIterations">Number of iterations to do</param>
        /// <param name="InitialVector">Needs to be 16 ASCII characters long</param>
        /// <param name="KeySize">Can be 128, 192, or 256</param>
        /// <returns>An encrypted string</returns>
        public static string Encrypt(string PlainText, string Password, string Salt, string HashAlgorithm, int PasswordIterations, string InitialVector, int KeySize)
        {
            try
            {
                byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
                byte[] SaltValueBytes = Encoding.ASCII.GetBytes(Salt);
                byte[] PlainTextBytes = Encoding.UTF8.GetBytes(PlainText);
                PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Password, SaltValueBytes, HashAlgorithm, PasswordIterations);
                byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
                RijndaelManaged SymmetricKey = new RijndaelManaged();
                SymmetricKey.Mode = CipherMode.CBC;
                byte[] CipherTextBytes = null;
                using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVectorBytes))
                {
                    using (MemoryStream MemStream = new MemoryStream())
                    {
                        using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
                        {
                            CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length);
                            CryptoStream.FlushFinalBlock();
                            CipherTextBytes = MemStream.ToArray();
                            MemStream.Close();
                            CryptoStream.Close();
                        }
                    }
                }
                return Convert.ToBase64String(CipherTextBytes);
            }
            catch (Exception a)
            {
                throw a;
            }
        }

        /// <summary>
        /// Decrypts a string
        /// </summary>
        /// <param name="CipherText">Text to be decrypted</param>
        /// <param name="Password">Password to decrypt with</param>
        /// <param name="Salt">Salt to decrypt with</param>
        /// <param name="HashAlgorithm">Can be either SHA1 or MD5</param>
        /// <param name="PasswordIterations">Number of iterations to do</param>
        /// <param name="InitialVector">Needs to be 16 ASCII characters long</param>
        /// <param name="KeySize">Can be 128, 192, or 256</param>
        /// <returns>A decrypted string</returns>
        public static string Decrypt(string CipherText, string Password, string Salt, string HashAlgorithm, int PasswordIterations, string InitialVector, int KeySize)
        {
            try
            {
                byte[] InitialVectorBytes = Encoding.ASCII.GetBytes(InitialVector);
                byte[] SaltValueBytes = Encoding.ASCII.GetBytes(Salt);
                byte[] CipherTextBytes = Convert.FromBase64String(CipherText);
                PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Password, SaltValueBytes, HashAlgorithm, PasswordIterations);
                byte[] KeyBytes = DerivedPassword.GetBytes(KeySize / 8);
                RijndaelManaged SymmetricKey = new RijndaelManaged();
                SymmetricKey.Mode = CipherMode.CBC;
                byte[] PlainTextBytes = new byte[CipherTextBytes.Length];
                int ByteCount = 0;
                using (ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(KeyBytes, InitialVectorBytes))
                {
                    using (MemoryStream MemStream = new MemoryStream(CipherTextBytes))
                    {
                        using (CryptoStream CryptoStream = new CryptoStream(MemStream, Decryptor, CryptoStreamMode.Read))
                        {

                            ByteCount = CryptoStream.Read(PlainTextBytes, 0, PlainTextBytes.Length);
                            MemStream.Close();
                            CryptoStream.Close();
                        }
                    }
                }
                return Encoding.UTF8.GetString(PlainTextBytes, 0, ByteCount);
            }
            catch (Exception a)
            {
                throw a;
            }
        }
        #endregion
    }

Thanks and Regards
Vivek

Edited by: Vivek.M.K on Apr 22, 2010 9:45 AM