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POC# 2-way Encryption Class - Rijndael possible initialization vector issue (jibberish output)
 

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  1. POC# 2-way Encryption Class - Rijndael possible initialization vector issue (jibberish output)
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    <p>I am having problems with an encryption class that I made:</p> <pre><code>public static class Encryption { public static string EncryptToString(string TextToEncrypt, byte[] Key, byte[] IV = null) { return ByteArrToString(EncryptStringToBytes(StrToByteArray(TextToEncrypt), Key, IV)); } public static string EncryptToString(byte[] BytesToEncrypt, byte[] Key, byte[] IV = null) { return ByteArrToString(EncryptStringToBytes(BytesToEncrypt, Key, IV)); } public static byte[] EncryptToBytes(string TextToEncrypt, byte[] Key, byte[] IV = null) { return EncryptStringToBytes(StrToByteArray(TextToEncrypt), Key, IV); } public static byte[] EncryptToBytes(byte[] BytesToEncrypt, byte[] Key, byte[] IV = null) { return EncryptStringToBytes(BytesToEncrypt, Key, IV); } public static string DecryptToString(string EncryptedText, byte[] Key,byte[] IV=null) { return ByteArrToString(DecryptStringFromBytes(StrToByteArray(EncryptedText), Key, IV)); } public static string DecryptToString(byte[] EncryptedBytes, byte[] Key,byte[] IV=null) { return ByteArrToString(DecryptStringFromBytes(EncryptedBytes, Key, IV)); } public static byte[] DecryptToBytes(string EncryptedText, byte[] Key,byte[] IV=null) { return DecryptStringFromBytes(StrToByteArray(EncryptedText), Key, IV); } public static byte[] DecryptToBytes(byte[] EncryptedBytes, byte[] Key,byte[] IV=null) { return DecryptStringFromBytes(EncryptedBytes, Key, IV); } private static byte[] EncryptStringToBytes(byte[] TextToEncrypt, byte[] Key, byte[] IV=null) { Debug.WriteLine("Password: " + ByteArrToString(Key)); Debug.WriteLine("IV: " + ByteArrToString(IV)); byte[] encrypted; // Create an Rijndael object // with the specified key and IV. using (Rijndael rijAlg = Rijndael.Create()) { rijAlg.Key = Key; rijAlg.IV = IV; // Create a decrytor to perform the stream transform. ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV); // Create the streams used for encryption. using (MemoryStream 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(TextToEncrypt); } encrypted = msEncrypt.ToArray(); } } } // Return the encrypted bytes from the memory stream. return encrypted; } private static byte[] DecryptStringFromBytes(byte[] EncryptedText, byte[] Key, byte[] IV) { Debug.WriteLine("Password: " + ByteArrToString(Key)); Debug.WriteLine("IV: " + ByteArrToString(IV)); byte[] fromEncrypt = new byte[EncryptedText.Length]; // Create a Rijndael object with the specified key and IV. using (Rijndael rijAlg = Rijndael.Create()) { rijAlg.Key = Key; rijAlg.IV = IV; // Create a decrytor to perform the stream transform. ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV); // Create the streams used for decryption. using (MemoryStream msDecrypt = new MemoryStream(EncryptedText)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { //read stream into byte array csDecrypt.Read(fromEncrypt,0,fromEncrypt.Length); } } } return fromEncrypt; } public static byte[] StrToByteArray(string str) { if (str.Length == 0) throw new Exception("Invalid string value in StrToByteArray"); byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; } public static string ByteArrToString(byte[] bytes) { char[] chars = new char[bytes.Length / sizeof(char)]; System.Buffer.BlockCopy(bytes, 0, chars, 0, bytes.Length); return new string(chars); } public static byte[] GetIV() { byte[] randomArray = new byte[16]; RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); rng.GetBytes(randomArray); return randomArray; } } </code></pre> <p>I test it with the following:</p> <pre><code>byte[] iv = Encryption.GetIV(); byte[] password = Encryption.StrToByteArray("password"); string encrypted = Encryption.EncryptToString("Hello", password, iv); Debug.WriteLine("Result: " + Encryption.DecryptToString(encrypted, password, iv)); </code></pre> <p>This is the result I get in the debug window:</p> <blockquote> <p>Password: password </p> <p>IV: 䴞ㆫ튾꛽輔 </p> <p>Password: password </p> <p>IV: 䴞ㆫ튾꛽輔</p> <p>Result: 祓瑳浥䈮瑹孥]</p> </blockquote> <p>I don't get any errors; just a jibberish result. </p> <p>I don't know if it's a problem with the initialization vector, the stream, or something else that I'm missing. </p>
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