System.Security.Cryptography.MD5CryptoServiceProvider.Initialize C# (CSharp) Method

        public override void Initialize()
        {
            // Nothing to do here. We expect HashAlgorithm to invoke HashFinal() and Initialize() as a pair. This reflects the
            // reality that our native crypto providers (e.g. CNG) expose hash finalization and object reinitialization as an atomic operation.
        }

        static byte[] CreateKeyDigest(String password, byte[] docIdData)
        {
            Check16Bytes(docIdData, "docId");
            int nChars = Math.Min(password.Length, 16);
            byte[] passwordData = new byte[nChars * 2];
            for (int i = 0; i < nChars; i++)
            {
                char ch = password[i];
                passwordData[i * 2 + 0] = (byte)((ch << 0) & 0xFF);
                passwordData[i * 2 + 1] = (byte)((ch << 8) & 0xFF);
            }

            byte[] kd;
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] passwordHash = md5.ComputeHash(passwordData);

            md5.Clear();
            md5.Initialize();

            byte[] data=new byte[passwordHash.Length*16 + docIdData.Length*16];

            int offset=0;
            for (int i = 0; i < 16; i++)
            {
                Array.Copy(passwordHash, 0, data, offset, PASSWORD_HASH_NUMBER_OF_BYTES_USED);
                offset+=passwordHash.Length;
                Array.Copy(docIdData,0,data,offset,docIdData.Length);
                offset += docIdData.Length;                
            }
            kd = md5.ComputeHash(data);
            byte[] result = new byte[KEY_DIGEST_LENGTH];
            Array.Copy(kd, 0, result, 0, KEY_DIGEST_LENGTH);
            return result;
        }