Simple Encrypt/Decrypt C#

C Sharp - C# (programming language)
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dzcadii
Posts: 94
Joined: Sun Mar 01, 2015 4:36 am

Simple Encrypt/Decrypt C#

Post by dzcadii » Sun Mar 01, 2015 10:51 pm

Code: Select all

static readonly string PasswordHash = "P@@Sw0rd";
static readonly string SaltKey = "S@LT&KEY";
static readonly string VIKey = "@1B2c3D4e5F6g7H8";
for encrypt

Code: Select all

public static string Encrypt(string plainText)
		{
			byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

			byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
			var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.Zeros };
			var encryptor = symmetricKey.CreateEncryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
			
			byte[] cipherTextBytes;

			using (var memoryStream = new MemoryStream())
			{
				using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
				{
					cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
					cryptoStream.FlushFinalBlock();
					cipherTextBytes = memoryStream.ToArray();
					cryptoStream.Close();
				}
				memoryStream.Close();
			}
			return Convert.ToBase64String(cipherTextBytes);
		}
to decrypt

Code: Select all

public static string Decrypt(string encryptedText)
		{
			byte[] cipherTextBytes = Convert.FromBase64String(encryptedText);
			byte[] keyBytes = new Rfc2898DeriveBytes(PasswordHash, Encoding.ASCII.GetBytes(SaltKey)).GetBytes(256 / 8);
			var symmetricKey = new RijndaelManaged() { Mode = CipherMode.CBC, Padding = PaddingMode.None };

			var decryptor = symmetricKey.CreateDecryptor(keyBytes, Encoding.ASCII.GetBytes(VIKey));
			var memoryStream = new MemoryStream(cipherTextBytes);
			var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
			byte[] plainTextBytes = new byte[cipherTextBytes.Length];

			int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
			memoryStream.Close();
			cryptoStream.Close();
			return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount).TrimEnd("\0".ToCharArray());
		}

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