public KeysEntry(string contentId, string passcode)
{
Keys = new PkgEntryKey[7];
seedDigest = Crypto.Sha256(Encoding.ASCII.GetBytes(contentId.PadRight(48, '\0')));
for (uint i = 0; i < 7; i++)
{
var passcodeKey = Crypto.ComputeKeys(contentId, passcode, i);
Keys[i] = new PkgEntryKey
{
digest = Crypto.Sha256(passcodeKey).Xor(passcodeKey),
key = Crypto.RSA2048EncryptKey(Util.Keys.PkgPublicKeys[i], passcodeKey)
};
}
Keys[0].key = Crypto.RSA2048EncryptKey(Util.Keys.PkgPublicKeys[0], Encoding.ASCII.GetBytes(passcode));
}
public static KeysEntry Read(MetaEntry e, Stream pkg)
{
pkg.Position = e.DataOffset;
var seedDigest = pkg.ReadBytes(32);
var digests = new byte[7][];
var keys = new PkgEntryKey[7];
for (var x = 0; x < 7; x++)
{
digests[x] = pkg.ReadBytes(32);
}
for (var x = 0; x < 7; x++)
{
keys[x] = new PkgEntryKey
{
digest = digests[x],
key = pkg.ReadBytes(256)
};
}
return(new KeysEntry(seedDigest, keys)
{
meta = e
});
}