/// <summary>
/// Decrypt the specified bytes using the password.
/// </summary>
/// <param name="bytes">Bytes to decrypt.</param>
/// <param name="key">The key the cipher was encrypted with.</param>
public byte[] Decrypt(byte[] bytes, byte[] key)
{
var encryptedCipher = new EncryptedCipher(bytes);
using (var aes = new AesManaged())
{
aes.KeySize = encryptedCipher.Keysize;
aes.IV = encryptedCipher.IV;
aes.Key = key;
return(Transform(encryptedCipher.Cipher, aes.CreateDecryptor));
}
}
/// <summary>
/// Creates a CryptoStream that decrypts the given input stream when read from.
/// </summary>
/// <param name="input">Input stream to decrypts</param>
/// <param name="key">The key the cipher was encrypted with.</param>
public Stream Decrypt(Stream input, byte[] key)
{
var encryptedCipher = new EncryptedCipher(input);
using (var aes = new AesManaged())
{
aes.KeySize = encryptedCipher.Keysize;
aes.IV = encryptedCipher.IV;
aes.Key = key;
return(new CryptoStream(input, aes.CreateDecryptor(), CryptoStreamMode.Read));
}
}
/// <summary>
/// Creates a CryptoStream that encrypts the given input when written to.
/// </summary>
/// <param name="input">Input stream to encrypt</param>
/// <param name="key">Key to use for encryption.</param>
public CryptoStream Encrypt(Stream input, byte[] key)
{
using (var aes = new AesManaged())
{
aes.KeySize = aes.LegalKeySizes.Max(keySize => keySize.MaxSize);
aes.GenerateIV();
aes.Key = key;
var encryptedCipherHeader = new EncryptedCipher
{
Keysize = aes.KeySize,
Cipher = new byte[0],
IV = aes.IV
};
var headerBytes = encryptedCipherHeader.ToBytes();
input.Write(headerBytes, 0, headerBytes.Length);
return(new CryptoStream(input, aes.CreateEncryptor(), CryptoStreamMode.Write));
}
}
