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- //Dawid Grzeszuk Prawa Zastrzeżone,aby wykorzystać w programie należy zamieścić informacje o twórcy
- using System;
- using System.Collections.Generic;
- using System.IO;
- using System.Linq;
- using System.Security.Cryptography;
- using System.Text;
- using System.Threading.Tasks;
- namespace FoodNavigator___Controller.Data_Encrypter
- {
- public static class Enrypter
- {
- private const int Keysize = 256;
- private const int DerivationIterations = 1000;
- public static string Encrypt(string plainText, string passPhrase)
- {
- var saltStringBytes = Generate256BitsOfRandomEntropy();
- var ivStringBytes = Generate256BitsOfRandomEntropy();
- var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
- using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
- {
- var keyBytes = password.GetBytes(Keysize / 8);
- using (var symmetricKey = new RijndaelManaged())
- {
- symmetricKey.BlockSize = 256;
- symmetricKey.Mode = CipherMode.CBC;
- symmetricKey.Padding = PaddingMode.PKCS7;
- using (var encryptor = symmetricKey.CreateEncryptor(keyBytes, ivStringBytes))
- {
- using (var memoryStream = new MemoryStream())
- {
- using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
- {
- cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
- cryptoStream.FlushFinalBlock();
- var cipherTextBytes = saltStringBytes;
- cipherTextBytes = cipherTextBytes.Concat(ivStringBytes).ToArray();
- cipherTextBytes = cipherTextBytes.Concat(memoryStream.ToArray()).ToArray();
- memoryStream.Close();
- cryptoStream.Close();
- return Convert.ToBase64String(cipherTextBytes);
- }
- }
- }
- }
- }
- }
- public static string Decrypt(string cipherText, string passPhrase)
- {
- var cipherTextBytesWithSaltAndIv = Convert.FromBase64String(cipherText);
- var saltStringBytes = cipherTextBytesWithSaltAndIv.Take(Keysize / 8).ToArray();
- var ivStringBytes = cipherTextBytesWithSaltAndIv.Skip(Keysize / 8).Take(Keysize / 8).ToArray();
- var cipherTextBytes = cipherTextBytesWithSaltAndIv.Skip((Keysize / 8) * 2).Take(cipherTextBytesWithSaltAndIv.Length - ((Keysize / 8) * 2)).ToArray();
- using (var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations))
- {
- var keyBytes = password.GetBytes(Keysize / 8);
- using (var symmetricKey = new RijndaelManaged())
- {
- symmetricKey.BlockSize = 256;
- symmetricKey.Mode = CipherMode.CBC;
- symmetricKey.Padding = PaddingMode.PKCS7;
- using (var decryptor = symmetricKey.CreateDecryptor(keyBytes, ivStringBytes))
- {
- using (var memoryStream = new MemoryStream(cipherTextBytes))
- {
- using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
- {
- 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);
- }
- }
- }
- }
- }
- }
- private static byte[] Generate256BitsOfRandomEntropy()
- {
- var randomBytes = new byte[32];
- using (var rngCsp = new RNGCryptoServiceProvider())
- {
- rngCsp.GetBytes(randomBytes);
- }
- return randomBytes;
- }
- }
- }
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