private static TStandardEncryptionVerifier ReadStandardVerifier(byte[] Verifier)
{
TStandardEncryptionVerifier Result = new TStandardEncryptionVerifier();
Result.EncryptedVerifier = new byte[16];
Array.Copy(Verifier, 20, Result.EncryptedVerifier, 0, Result.EncryptedVerifier.Length);
Result.VerifierHashSizeBytes = (int)BitOps.GetCardinal(Verifier, 20 + 16) / 8;
Result.EncryptedVerifierHash = new byte[32];
Array.Copy(Verifier, 20 + 16 + 4, Result.EncryptedVerifierHash, 0, Result.EncryptedVerifierHash.Length);
return(Result);
}
private static Stream ReadStandardEncryptionInfo(TOle2File DataStream, TEncryptionData Encryption)
{
byte[] RecordHeaderLen = new byte[4];
DataStream.Read(RecordHeaderLen, RecordHeaderLen.Length);
long EncryptionHeaderSize = BitOps.GetCardinal(RecordHeaderLen, 0);
byte[] EncryptionHeader = new byte[EncryptionHeaderSize];
DataStream.Read(EncryptionHeader, EncryptionHeader.Length);
long AlgId = BitOps.GetCardinal(EncryptionHeader, 8);
long KeyBits = BitOps.GetCardinal(EncryptionHeader, 16);
TEncryptionParameters EncParams = TEncryptionParameters.CreateStandard(GetStandardEncAlg(AlgId));
byte[] VerifierBytes = new byte[DataStream.Length - DataStream.Position];
DataStream.Read(VerifierBytes, VerifierBytes.Length);
TStandardEncryptionVerifier Verifier = ReadStandardVerifier(VerifierBytes);
TEncryptionKey Key = new TStandardEncryptionKey(ReadStandardSalt(VerifierBytes), (int)KeyBits / 8);
CheckPassword(Encryption, Verifier, EncParams, Key);
return(DecryptStream(DataStream, EncParams, Key));
}