internal WinzipAesEncryptionData(WinzipAesKeySize keySize, byte[] salt, byte[] passwordVerifyValue, string password)
{
this.keySize = keySize;
this.salt = salt;
this.passwordVerifyValue = passwordVerifyValue;
this.password = password;
Initialize();
}
internal WinzipAesEncryptionData(WinzipAesKeySize keySize, byte[] salt, byte[] passwordVerifyValue, string password)
{
this.keySize = keySize;
this.salt = salt;
this.passwordVerifyValue = passwordVerifyValue;
this.password = password;
Initialize();
}
internal static int KeyLengthInBytes(WinzipAesKeySize keySize)
{
return(keySize switch
{
WinzipAesKeySize.KeySize128 => 16,
WinzipAesKeySize.KeySize192 => 24,
WinzipAesKeySize.KeySize256 => 32,
_ => throw new InvalidOperationException(),
});
internal static int KeyLengthInBytes(WinzipAesKeySize keySize)
{
switch (keySize)
{
case WinzipAesKeySize.KeySize128:
return 16;
case WinzipAesKeySize.KeySize192:
return 24;
case WinzipAesKeySize.KeySize256:
return 32;
}
throw new InvalidOperationException();
}
internal static int KeyLengthInBytes(WinzipAesKeySize keySize)
{
switch (keySize)
{
case WinzipAesKeySize.KeySize128: return(16);
case WinzipAesKeySize.KeySize192: return(24);
case WinzipAesKeySize.KeySize256: return(32);
default: throw new InvalidOperationException();
}
;
}
internal static int KeyLengthInBytes(WinzipAesKeySize keySize)
{
switch (keySize)
{
case WinzipAesKeySize.KeySize128:
return(0x10);
case WinzipAesKeySize.KeySize192:
return(0x18);
case WinzipAesKeySize.KeySize256:
return(0x20);
}
throw new InvalidOperationException();
}
private void LoadHeader(ZipFileEntry entryHeader, Stream stream)
{
if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.Encrypted))
{
if (!entryHeader.IsDirectory &&
entryHeader.CompressedSize == 0 &&
FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
{
throw new NotSupportedException(
"SharpCompress cannot currently read non-seekable Zip Streams with encrypted data that has been written in a non-seekable manner.");
}
if (password == null)
{
throw new CryptographicException("No password supplied for encrypted zip.");
}
if (entryHeader.CompressionMethod != ZipCompressionMethod.WinzipAes)
{
byte[] buffer = new byte[12];
stream.Read(buffer, 0, 12);
entryHeader.PkwareTraditionalEncryptionData = PkwareTraditionalEncryptionData.ForRead(password,
entryHeader,
buffer);
entryHeader.CompressedSize -= 12;
}
else
{
#if NO_CRYPTO
throw new NotSupportedException("Cannot decrypt Winzip AES with Silverlight or WP7.");
#else
var data = entryHeader.Extra.SingleOrDefault(x => x.Type == ExtraDataType.WinZipAes);
WinzipAesKeySize keySize = (WinzipAesKeySize)data.DataBytes[4];
byte[] salt = new byte[WinzipAesEncryptionData.KeyLengthInBytes(keySize) / 2];
byte[] passwordVerifyValue = new byte[2];
stream.Read(salt, 0, salt.Length);
stream.Read(passwordVerifyValue, 0, 2);
entryHeader.WinzipAesEncryptionData = new WinzipAesEncryptionData(keySize, salt, passwordVerifyValue,
password);
entryHeader.CompressedSize -= (uint)(salt.Length + 2);
#endif
}
}
if (entryHeader.IsDirectory)
{
return;
}
//if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
//{
// entryHeader.PackedStream = new ReadOnlySubStream(stream);
//}
//else
//{
switch (mode)
{
case StreamingMode.Seekable:
{
entryHeader.DataStartPosition = stream.Position;
stream.Position += entryHeader.CompressedSize;
}
break;
case StreamingMode.Streaming:
{
entryHeader.PackedStream = stream;
}
break;
default:
{
throw new InvalidFormatException("Invalid StreamingMode");
}
}
//}
}
