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using System;
using System.Security.Cryptography;
namespace Hazel.Crypto
{
/// <summary>
/// AES provider using the default System.Security.Cryptography implementation
/// </summary>
public class DefaultAes : IAes
{
private readonly ICryptoTransform encryptor_;
/// <summary>
/// Create a new default instance of the AES block cipher
/// </summary>
/// <param name="key">Encryption key</param>
public DefaultAes(ByteSpan key)
{
// Create the AES block cipher
using (Aes aes = Aes.Create())
{
aes.KeySize = key.Length * 8;
aes.BlockSize = aes.KeySize;
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.Zeros;
aes.Key = key.ToArray();
this.encryptor_ = aes.CreateEncryptor();
}
}
/// <inheritdoc/>
public void Dispose()
{
this.encryptor_.Dispose();
}
/// <inheritdoc/>
public int EncryptBlock(ByteSpan inputSpan, ByteSpan outputSpan)
{
if (inputSpan.Length != outputSpan.Length)
{
throw new ArgumentException($"ouputSpan length ({outputSpan.Length}) does not match inputSpan length ({inputSpan.Length})", nameof(outputSpan));
}
return this.encryptor_.TransformBlock(inputSpan.GetUnderlyingArray(), inputSpan.Offset, inputSpan.Length, outputSpan.GetUnderlyingArray(), outputSpan.Offset);
}
}
}
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