|
|
|
|
@ -1,6 +1,5 @@
|
|
|
|
|
using System;
|
|
|
|
|
using System.IO;
|
|
|
|
|
using System.Linq;
|
|
|
|
|
using System.Security.Cryptography;
|
|
|
|
|
using System.Text;
|
|
|
|
|
|
|
|
|
|
@ -8,12 +7,6 @@ namespace Ombi.Helpers
|
|
|
|
|
{
|
|
|
|
|
public class StringCipher
|
|
|
|
|
{
|
|
|
|
|
// This constant determines the number of iterations for the password bytes generation function.
|
|
|
|
|
private const int DerivationIterations = 1000;
|
|
|
|
|
// This constant is used to determine the keysize of the encryption algorithm in bits.
|
|
|
|
|
// We divide this by 8 within the code below to get the equivalent number of bytes.
|
|
|
|
|
private const int Keysize = 256;
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Decrypts the specified cipher text.
|
|
|
|
|
/// </summary>
|
|
|
|
|
@ -22,39 +15,32 @@ namespace Ombi.Helpers
|
|
|
|
|
/// <returns></returns>
|
|
|
|
|
public static string Decrypt(string cipherText, string passPhrase)
|
|
|
|
|
{
|
|
|
|
|
// Get the complete stream of bytes that represent:
|
|
|
|
|
// [32 bytes of Salt] + [32 bytes of IV] + [n bytes of CipherText]
|
|
|
|
|
var cipherTextBytesWithSaltAndIv = Convert.FromBase64String(cipherText);
|
|
|
|
|
// Get the saltbytes by extracting the first 32 bytes from the supplied cipherText bytes.
|
|
|
|
|
var saltStringBytes = cipherTextBytesWithSaltAndIv.Take(Keysize / 8).ToArray();
|
|
|
|
|
// Get the IV bytes by extracting the next 32 bytes from the supplied cipherText bytes.
|
|
|
|
|
var ivStringBytes = cipherTextBytesWithSaltAndIv.Skip(Keysize / 8).Take(Keysize / 8).ToArray();
|
|
|
|
|
// Get the actual cipher text bytes by removing the first 64 bytes from the cipherText string.
|
|
|
|
|
var cipherTextBytes = cipherTextBytesWithSaltAndIv.Skip((Keysize / 8) * 2).Take(cipherTextBytesWithSaltAndIv.Length - ((Keysize / 8) * 2)).ToArray();
|
|
|
|
|
var fullCipher = Convert.FromBase64String(cipherText);
|
|
|
|
|
|
|
|
|
|
var iv = new byte[16];
|
|
|
|
|
var cipher = new byte[16];
|
|
|
|
|
|
|
|
|
|
Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length);
|
|
|
|
|
Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, iv.Length);
|
|
|
|
|
var key = Encoding.UTF8.GetBytes(passPhrase);
|
|
|
|
|
|
|
|
|
|
using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
|
|
|
|
|
using (var aesAlg = Aes.Create())
|
|
|
|
|
{
|
|
|
|
|
var keyBytes = password.GetBytes(Keysize / 8);
|
|
|
|
|
var aes = Aes.Create();
|
|
|
|
|
using (var symmetricKey = new RijndaelManaged())
|
|
|
|
|
using (var decryptor = aesAlg.CreateDecryptor(key, iv))
|
|
|
|
|
{
|
|
|
|
|
symmetricKey.BlockSize = 256;
|
|
|
|
|
symmetricKey.Mode = CipherMode.CBC;
|
|
|
|
|
symmetricKey.Padding = PaddingMode.PKCS7;
|
|
|
|
|
using (var decryptor = symmetricKey.CreateDecryptor(keyBytes, ivStringBytes))
|
|
|
|
|
string result;
|
|
|
|
|
using (var msDecrypt = new MemoryStream(cipher))
|
|
|
|
|
{
|
|
|
|
|
using (var memoryStream = new MemoryStream(cipherTextBytes))
|
|
|
|
|
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
|
|
|
|
|
{
|
|
|
|
|
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
|
|
|
|
|
using (var srDecrypt = new StreamReader(csDecrypt))
|
|
|
|
|
{
|
|
|
|
|
var plainTextBytes = new byte[cipherTextBytes.Length];
|
|
|
|
|
var decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
|
|
|
|
|
memoryStream.Close();
|
|
|
|
|
cryptoStream.Close();
|
|
|
|
|
return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
|
|
|
|
|
result = srDecrypt.ReadToEnd();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
@ -67,54 +53,33 @@ namespace Ombi.Helpers
|
|
|
|
|
/// <returns></returns>
|
|
|
|
|
public static string Encrypt(string plainText, string passPhrase)
|
|
|
|
|
{
|
|
|
|
|
// Salt and IV is randomly generated each time, but is preprended to encrypted cipher text
|
|
|
|
|
// so that the same Salt and IV values can be used when decrypting.
|
|
|
|
|
var saltStringBytes = Generate256BitsOfRandomEntropy();
|
|
|
|
|
var ivStringBytes = Generate256BitsOfRandomEntropy();
|
|
|
|
|
var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
|
|
|
|
|
using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
|
|
|
|
|
var key = Encoding.UTF8.GetBytes(passPhrase);
|
|
|
|
|
|
|
|
|
|
using (var aesAlg = Aes.Create())
|
|
|
|
|
{
|
|
|
|
|
var keyBytes = password.GetBytes(Keysize / 8);
|
|
|
|
|
using (var symmetricKey = new RijndaelManaged())
|
|
|
|
|
using (var encryptor = aesAlg.CreateEncryptor(key, aesAlg.IV))
|
|
|
|
|
{
|
|
|
|
|
symmetricKey.BlockSize = 256;
|
|
|
|
|
symmetricKey.Mode = CipherMode.CBC;
|
|
|
|
|
symmetricKey.Padding = PaddingMode.PKCS7;
|
|
|
|
|
using (var encryptor = symmetricKey.CreateEncryptor(keyBytes, ivStringBytes))
|
|
|
|
|
using (var msEncrypt = new MemoryStream())
|
|
|
|
|
{
|
|
|
|
|
using (var memoryStream = new MemoryStream())
|
|
|
|
|
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
|
|
|
|
|
using (var swEncrypt = new StreamWriter(csEncrypt))
|
|
|
|
|
{
|
|
|
|
|
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
|
|
|
|
|
{
|
|
|
|
|
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
|
|
|
|
|
cryptoStream.FlushFinalBlock();
|
|
|
|
|
// Create the final bytes as a concatenation of the random salt bytes, the random iv bytes and the cipher bytes.
|
|
|
|
|
var cipherTextBytes = saltStringBytes;
|
|
|
|
|
cipherTextBytes = cipherTextBytes.Concat(ivStringBytes).ToArray();
|
|
|
|
|
cipherTextBytes = cipherTextBytes.Concat(memoryStream.ToArray()).ToArray();
|
|
|
|
|
memoryStream.Close();
|
|
|
|
|
cryptoStream.Close();
|
|
|
|
|
return Convert.ToBase64String(cipherTextBytes);
|
|
|
|
|
}
|
|
|
|
|
swEncrypt.Write(plainText);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var iv = aesAlg.IV;
|
|
|
|
|
|
|
|
|
|
var decryptedContent = msEncrypt.ToArray();
|
|
|
|
|
|
|
|
|
|
var result = new byte[iv.Length + decryptedContent.Length];
|
|
|
|
|
|
|
|
|
|
Buffer.BlockCopy(iv, 0, result, 0, iv.Length);
|
|
|
|
|
Buffer.BlockCopy(decryptedContent, 0, result, iv.Length, decryptedContent.Length);
|
|
|
|
|
|
|
|
|
|
return Convert.ToBase64String(result);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// <summary>
|
|
|
|
|
/// Generate256s the bits of random entropy.
|
|
|
|
|
/// </summary>
|
|
|
|
|
/// <returns></returns>
|
|
|
|
|
private static byte[] Generate256BitsOfRandomEntropy()
|
|
|
|
|
{
|
|
|
|
|
var randomBytes = new byte[32]; // 32 Bytes will give us 256 bits.
|
|
|
|
|
using (var rngCsp = new RNGCryptoServiceProvider())
|
|
|
|
|
{
|
|
|
|
|
// Fill the array with cryptographically secure random bytes.
|
|
|
|
|
rngCsp.GetBytes(randomBytes);
|
|
|
|
|
}
|
|
|
|
|
return randomBytes;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
tidusjar
8 years ago