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namespace LibTSforge.Crypto
{
using System;
using System.Linq;
using System.Security.Cryptography;
public static class CryptoUtils
{
public static byte[] GenerateRandomKey(int len)
{
byte[] rand = new byte[len];
Random r = new Random();
r.NextBytes(rand);
return rand;
}
public static byte[] AESEncrypt(byte[] data, byte[] key)
{
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, Enumerable.Repeat((byte)0, 16).ToArray());
byte[] encryptedData = encryptor.TransformFinalBlock(data, 0, data.Length);
return encryptedData;
}
}
public static byte[] AESDecrypt(byte[] data, byte[] key)
{
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, Enumerable.Repeat((byte)0, 16).ToArray());
byte[] decryptedData = decryptor.TransformFinalBlock(data, 0, data.Length);
return decryptedData;
}
}
public static byte[] RSADecrypt(byte[] rsaKey, byte[] data)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportCspBlob(rsaKey);
return rsa.Decrypt(data, false);
}
}
public static byte[] RSAEncrypt(byte[] rsaKey, byte[] data)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportCspBlob(rsaKey);
return rsa.Encrypt(data, false);
}
}
public static byte[] RSASign(byte[] rsaKey, byte[] data)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportCspBlob(rsaKey);
RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(rsa);
formatter.SetHashAlgorithm("SHA1");
byte[] hash;
using (SHA1 sha1 = SHA1.Create())
{
hash = sha1.ComputeHash(data);
}
return formatter.CreateSignature(hash);
}
}
public static bool RSAVerifySignature(byte[] rsaKey, byte[] data, byte[] signature)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportCspBlob(rsaKey);
RSAPKCS1SignatureDeformatter deformatter = new RSAPKCS1SignatureDeformatter(rsa);
deformatter.SetHashAlgorithm("SHA1");
byte[] hash;
using (SHA1 sha1 = SHA1.Create())
{
hash = sha1.ComputeHash(data);
}
return deformatter.VerifySignature(hash, signature);
}
}
public static byte[] HMACSign(byte[] key, byte[] data)
{
HMACSHA1 hmac = new HMACSHA1(key);
return hmac.ComputeHash(data);
}
public static bool HMACVerify(byte[] key, byte[] data, byte[] signature)
{
return Enumerable.SequenceEqual(signature, HMACSign(key, data));
}
public static byte[] SaltSHASum(byte[] salt, byte[] data)
{
SHA1 sha1 = SHA1.Create();
byte[] sha_data = salt.Concat(data).ToArray();
return sha1.ComputeHash(sha_data);
}
public static bool SaltSHAVerify(byte[] salt, byte[] data, byte[] checksum)
{
return Enumerable.SequenceEqual(checksum, SaltSHASum(salt, data));
}
public static byte[] SHA256Hash(byte[] data)
{
using (SHA256 sha256 = SHA256.Create())
{
return sha256.ComputeHash(data);
}
}
}
}
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