Szyfrowanie OpenSSL using.NET klasy

W końcu to rozgryzłem. Jeśli ktoś potrzebuje zintegrować OpenSSL i. Net bez użycia wrapperów openssl, podzielę się wynikami tutaj.

1) główny problem z moim oryginalnym kodem (jak w pytaniu) polega na tym, że musisz zainicjować rozmiar bloku i KeySize na instancji RijndaelManaged przed ustawieniem klucza lub IV.

2) ja tez mialem ustawiony BlockSize na 256 kiedy powinno byc tylko 128

3) reszta mojego problemu doszła do tego, że openssl umieszcza i oczekuje "Salted__" na przedniej części salt przed dodaniem zaszyfrowanego ciągu znaków, a następnie koduje go base64. (Widziałem to początkowo w dokumentacji openssl w odniesieniu do szyfrowania plików, ale nie sądziłem, że to robi, gdy robi to bezpośrednio przez linię komend-najwyraźniej się myliłem!! Zwróć również uwagę na kapitalizację S w Solone!)

Mając to wszystko na uwadze, oto mój" naprawiony " kod:

public class Protection
    {
        public string OpenSSLEncrypt(string plainText, string passphrase)
        {
            // generate salt
            byte[] key, iv;
            byte[] salt = new byte[8];
            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
            rng.GetNonZeroBytes(salt);
            DeriveKeyAndIV(passphrase, salt, out key, out iv);
            // encrypt bytes
            byte[] encryptedBytes = EncryptStringToBytesAes(plainText, key, iv);
            // add salt as first 8 bytes
            byte[] encryptedBytesWithSalt = new byte[salt.Length + encryptedBytes.Length + 8];
            Buffer.BlockCopy(Encoding.ASCII.GetBytes("Salted__"), 0, encryptedBytesWithSalt, 0, 8);
            Buffer.BlockCopy(salt, 0, encryptedBytesWithSalt, 8, salt.Length);
            Buffer.BlockCopy(encryptedBytes, 0, encryptedBytesWithSalt, salt.Length + 8, encryptedBytes.Length);
            // base64 encode
            return Convert.ToBase64String(encryptedBytesWithSalt);
        }

        public string OpenSSLDecrypt(string encrypted, string passphrase)
        {
            // base 64 decode
            byte[] encryptedBytesWithSalt = Convert.FromBase64String(encrypted);
            // extract salt (first 8 bytes of encrypted)
            byte[] salt = new byte[8];
            byte[] encryptedBytes = new byte[encryptedBytesWithSalt.Length - salt.Length - 8];
            Buffer.BlockCopy(encryptedBytesWithSalt, 8, salt, 0, salt.Length);
            Buffer.BlockCopy(encryptedBytesWithSalt, salt.Length + 8, encryptedBytes, 0, encryptedBytes.Length);
            // get key and iv
            byte[] key, iv;
            DeriveKeyAndIV(passphrase, salt, out key, out iv);
            return DecryptStringFromBytesAes(encryptedBytes, key, iv);
        }

        private static void DeriveKeyAndIV(string passphrase, byte[] salt, out byte[] key, out byte[] iv)
        {
            // generate key and iv
            List<byte> concatenatedHashes = new List<byte>(48);

            byte[] password = Encoding.UTF8.GetBytes(passphrase);
            byte[] currentHash = new byte[0];
            MD5 md5 = MD5.Create();
            bool enoughBytesForKey = false;
            // See http://www.openssl.org/docs/crypto/EVP_BytesToKey.html#KEY_DERIVATION_ALGORITHM
            while (!enoughBytesForKey)
            {
                int preHashLength = currentHash.Length + password.Length + salt.Length;
                byte[] preHash = new byte[preHashLength];

                Buffer.BlockCopy(currentHash, 0, preHash, 0, currentHash.Length);
                Buffer.BlockCopy(password, 0, preHash, currentHash.Length, password.Length);
                Buffer.BlockCopy(salt, 0, preHash, currentHash.Length + password.Length, salt.Length);

                currentHash = md5.ComputeHash(preHash);
                concatenatedHashes.AddRange(currentHash);

                if (concatenatedHashes.Count >= 48)
                    enoughBytesForKey = true;
            }

            key = new byte[32];
            iv = new byte[16];
            concatenatedHashes.CopyTo(0, key, 0, 32);
            concatenatedHashes.CopyTo(32, iv, 0, 16);

            md5.Clear();
            md5 = null;
        }

        static byte[] EncryptStringToBytesAes(string plainText, byte[] key, byte[] iv)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (key == null || key.Length <= 0)
                throw new ArgumentNullException("key");
            if (iv == null || iv.Length <= 0)
                throw new ArgumentNullException("iv");

            // Declare the stream used to encrypt to an in memory
            // array of bytes.
            MemoryStream msEncrypt;

            // Declare the RijndaelManaged object
            // used to encrypt the data.
            RijndaelManaged aesAlg = null;

            try
            {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged { Mode = CipherMode.CBC, KeySize = 256, BlockSize = 128, Key = key, IV = iv };

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                msEncrypt = new MemoryStream();
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {

                        //Write all data to the stream.
                        swEncrypt.Write(plainText);
                        swEncrypt.Flush();
                        swEncrypt.Close();
                    }
                }
            }
            finally
            {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear();
            }

            // Return the encrypted bytes from the memory stream.
            return msEncrypt.ToArray();
        }

        static string DecryptStringFromBytesAes(byte[] cipherText, byte[] key, byte[] iv)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (key == null || key.Length <= 0)
                throw new ArgumentNullException("key");
            if (iv == null || iv.Length <= 0)
                throw new ArgumentNullException("iv");

            // Declare the RijndaelManaged object
            // used to decrypt the data.
            RijndaelManaged aesAlg = null;

            // Declare the string used to hold
            // the decrypted text.
            string plaintext;

            try
            {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged {Mode = CipherMode.CBC, KeySize = 256, BlockSize = 128, Key = key, IV = iv};

                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {
                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                            srDecrypt.Close();
                        }
                    }
                }
            }
            finally
            {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear();
            }

            return plaintext;
        }
    }