public static bool FileDecrypt(string password, string rawDataFile, string outFile)
{
byte[] encryptedFile = File.ReadAllBytes(rawDataFile);
CryptData cryptData = new CryptData();
encryptedFile = cryptData.SliceFile(encryptedFile);
byte[] pwHash = Hashing.Hash(password, cryptData.Salt); // back into hashed password
if (Hashing.VerifyHash(cryptData.HashedPwdHash, pwHash, cryptData.Salt)) // check if hash of hashed password is the same as stored value
{
byte[] decryptedKeyIV = Encryption.AESDecryptB(cryptData.Cipher, pwHash, cryptData.CipherIV); // decrypt into actual key and iv of content unlocker
byte[] decIV = new byte[1];
byte[] decKey = decryptedKeyIV.SplitArr(Encryption.KEY_SIZE, out decIV);
byte[] decryptedContent = Encryption.AESDecryptB(encryptedFile, decKey, decIV); // decrypt the actual content with the decrypted key and iv
//File.WriteAllBytes(outFile, decryptedContent);
Util.AppendAllBytes(outFile, decryptedContent);
return(true);
}
return(false);
}
public static void FileEncrypt(string password, string unencryptedFile, string outFile, int lastBytes = -1) // read whole file if nothing specified
{
Aes aes = Aes.Create();
byte[] salt = new byte[Hashing.SALT_SIZE];
RandomNumberGenerator.Create().GetBytes(salt); // shared salt
if (lastBytes <= -1)
{
File.WriteAllBytes(outFile, Encryption.AESEncrypt(File.ReadAllBytes(unencryptedFile), aes.Key, aes.IV));
}
else
{
File.WriteAllBytes(outFile, Encryption.AESEncrypt(ReadLastBytes(unencryptedFile, lastBytes), aes.Key, aes.IV));
}
byte[] pwhash = Hashing.Hash(password, salt); // hash of password (used as key)
byte[] endhash = Hashing.Hash(pwhash, salt); // hash of password hash (used for verification)
byte[] plainKeyIV = ConcatArr(aes.Key, aes.IV);
aes.GenerateIV(); // now aes.iv uses a new iv
byte[] endcrypt = Encryption.AESEncrypt(plainKeyIV, pwhash, aes.IV); // encrypts key and iv used to unlock the actual content with the password hash
//MessageBox.Show(string.Format("{0} {1} {2} {3}", endcrypt.Length, aes.IV.Length, endhash.Length, salt.Length));
CryptData cryptData = new CryptData(endcrypt, aes.IV, endhash, salt);
AppendAllBytes(outFile, cryptData.ToArray());
}
