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add AESStringCrypter

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Pascal
2020-11-26 11:31:50 +01:00
parent 4051a92b4e
commit e0ee7c4e77
1 changed files with 212 additions and 0 deletions
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Pilz.Cryptography/AESStringCrypter.cs Normal file
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using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Pilz.Cryptography
{
public class AESStringCrypter : ICrypter
{
public delegate void AESStringCrypterEventHandler(AESStringCrypter sender);
/// <summary>
/// This event throws if no key and no default key was found. You can now provide a key or default key (maybe depending on the given instance). If no value is provided, a default key will be created.
/// </summary>
public static event AESStringCrypterEventHandler NeedKey;
/// <summary>
/// This event throws if no IV and no default IV was found. You can now provide a IV or default IV (maybe depending on the given instance). If no value is provided, a default IV will be created.
/// </summary>
public static event AESStringCrypterEventHandler NeedIV;
private byte[] key = new byte[] { };
private byte[] iv = new byte[] { };
private static byte[] defaultKey = new byte[] { };
private static byte[] defaultIV = new byte[] { };
public Encoding Encoding { get; set; } = Encoding.Default;
public string Name { get; set; }
public object Tag { get; set; }
public string Key
{
get => Convert.ToBase64String(key);
set => key = Convert.FromBase64String(value);
}
public string IV
{
get => Convert.ToBase64String(iv);
set => iv = Convert.FromBase64String(value);
}
public static string DefaultKey
{
get => Convert.ToBase64String(defaultKey);
set => defaultKey = Convert.FromBase64String(value);
}
public static string DefaultIV
{
get => Convert.ToBase64String(defaultIV);
set => defaultIV = Convert.FromBase64String(value);
}
public string Decrypt(string encryptedValue)
{
return DecryptStringFromBytes_Aes(Convert.FromBase64String(encryptedValue), GetKey(), GetIV());
}
public string Encrypt(string plainValue)
{
return Convert.ToBase64String(EncryptStringToBytes_Aes(plainValue, GetKey(), GetIV()));
}
private byte[] GetKey(bool createIfFail = false)
{
byte[] keyToUse;
if (key.Length != 0)
keyToUse = key;
else if (defaultKey.Length != 0)
keyToUse = defaultKey;
else if (createIfFail)
keyToUse = defaultKey = GenerateKeyInternal();
else
{
NeedKey?.Invoke(this);
keyToUse = GetKey(true);
}
return keyToUse;
}
private byte[] GetIV(bool createIfFail = false)
{
byte[] ivToUse;
if (iv.Length != 0)
ivToUse = iv;
else if (defaultIV.Length != 0)
ivToUse = defaultIV;
else if (createIfFail)
ivToUse = defaultIV = GenerateIVInternal();
else
{
NeedIV?.Invoke(this);
ivToUse = GetIV(true);
}
return ivToUse;
}
private static byte[] GenerateKeyInternal()
{
var aes = Aes.Create();
var key = aes.Key;
aes.Dispose();
return key;
}
public static string GenerateKey()
{
return Convert.ToBase64String(GenerateKeyInternal());
}
private static byte[] GenerateIVInternal()
{
var aes = Aes.Create();
var iv = aes.IV;
aes.Dispose();
return iv;
}
public static string GenerateIV()
{
return Convert.ToBase64String(GenerateIVInternal());
}
private static byte[] EncryptStringToBytes_Aes(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");
byte[] encrypted;
// Create an Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create an encryptor to perform the stream transform.
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.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(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
private static string DecryptStringFromBytes_Aes(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 string used to hold
// the decrypted text.
string plaintext = null;
// Create an Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create a decryptor 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();
}
}
}
}
return plaintext;
}
}
}