public static Stream Decrypt(Stream source, Headers headers, byte[] masterKey) { byte[] easKey; using (var buffer = new MemoryStream()) { var masterSeed = headers.MasterSeed; buffer.Write(masterSeed, 0, masterSeed.Length); buffer.Write(masterKey, 0, masterKey.Length); easKey = BufferEx.GetHash(buffer.ToArray()); } var eas = new AesManaged { KeySize = 256, Key = BufferEx.Clone(easKey), IV = BufferEx.Clone(headers.EncryptionIV) }; Stream stream = new CryptoStream(source, eas.CreateDecryptor(), CryptoStreamMode.Read); if (!VerifyStartBytes(headers, stream)) return null; stream = new HashedBlockStream(stream, true); return headers.Compression == Compressions.GZip ? new GZipInputStream(stream) : stream; }
public static Stream Decrypt(Stream source, Headers headers, byte[] masterKey) { byte[] easKey; using (var buffer = new MemoryStream()) { var masterSeed = headers.MasterSeed; buffer.Write(masterSeed, 0, masterSeed.Length); buffer.Write(masterKey, 0, masterKey.Length); easKey = BufferEx.GetHash(buffer.ToArray()); } var eas = new AesManaged { KeySize = 256, Key = BufferEx.Clone(easKey), IV = BufferEx.Clone(headers.EncryptionIV) }; Stream stream = new CryptoStream(source, eas.CreateDecryptor(), CryptoStreamMode.Read); if (!VerifyStartBytes(headers, stream)) { return(null); } stream = new HashedBlockStream(stream, true); return(headers.Compression == Compressions.GZip ? new GZipInputStream(stream) : stream); }
internal static Stream Encrypt(Stream source, Headers headers, byte[] masterKey) { byte[] easKey; using (var buffer = new MemoryStream()) { var masterSeed = headers.MasterSeed; buffer.Write(masterSeed, 0, masterSeed.Length); buffer.Write(masterKey, 0, masterKey.Length); easKey = BufferEx.GetHash(buffer.ToArray()); } var eas = new AesManaged { KeySize = 256, Key = BufferEx.Clone(easKey), IV = BufferEx.Clone(headers.EncryptionIV) }; Stream stream = new CryptoStream(source, eas.CreateEncryptor(), CryptoStreamMode.Write); stream.Write(headers.StreamStartBytes, 0, headers.StreamStartBytes.Length); stream = new HashedBlockStream(stream, false); return headers.Compression == Compressions.GZip ? new GZipOutputStream(stream) : stream; }