74 lines
2.4 KiB
C#
74 lines
2.4 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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namespace McCrypt
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{
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internal class Crypto
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{
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internal static byte[] Sha256(byte[] data)
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{
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SHA256 sha256 = SHA256.Create();
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byte[] hash = sha256.ComputeHash(data);
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sha256.Dispose();
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return hash;
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}
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internal static byte[] Aes256CfbEncrypt(byte[] key, byte[] iv, byte[] data)
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{
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Aes aes = Aes.Create();
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aes.Mode = CipherMode.CFB;
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aes.Padding = PaddingMode.None;
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aes.BlockSize = 128;
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aes.KeySize = 256;
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ICryptoTransform aesEncryptor = aes.CreateEncryptor(key, iv);
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using (MemoryStream msEncrypt = new MemoryStream())
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{
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using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, aesEncryptor, CryptoStreamMode.Write))
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{
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csEncrypt.Write(data, 0, data.Length);
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long totalWritten = data.Length;
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while ((totalWritten % 16 != 0))
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{
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csEncrypt.WriteByte(0);
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totalWritten++;
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}
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msEncrypt.Seek(0x00, SeekOrigin.Begin);
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return msEncrypt.ToArray();
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}
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}
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}
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internal static byte[] Aes256CfbDecrypt(byte[] key, byte[] iv, byte[] data)
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{
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Aes aes = Aes.Create();
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aes.Mode = CipherMode.CFB;
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aes.Padding = PaddingMode.Zeros;
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aes.BlockSize = 128;
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aes.KeySize = 256;
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ICryptoTransform aesDecryptor = aes.CreateDecryptor(key, iv);
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using (MemoryStream msDecrypt = new MemoryStream())
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{
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msDecrypt.Write(data, 0, data.Length);
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while (msDecrypt.Length % 16 != 0)
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msDecrypt.WriteByte(0);
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msDecrypt.Seek(0x00, SeekOrigin.Begin);
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using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, aesDecryptor, CryptoStreamMode.Read))
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{
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byte[] plaintext = new byte[msDecrypt.Length];
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csDecrypt.Read(plaintext, 0x00, plaintext.Length);
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Array.Copy(plaintext, data, data.Length);
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return data;
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}
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}
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}
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}
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}
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