Re: Problem Decrypting Data

> The one part I am not following to the letter is that I am calling the
> cryptSetAttribute methods *before* I call cryptPushData.
> 
> But when I reverse those two calls, I get an error (and not the expected
> error telling me I need a password, rather error -21 (No Permission to
> Perform this Operation.))
> 
> Any help would be greatly appreciated.

When calling crypt.CreateEnvelope(crypt.UNUSED,crypt.FORMAT_CRYPTLIB)
you try to encrypt and NOT to decrypt the message! That's why you get an
error -21 when you reverse your callind sequence.
You have to use crypt.FORMAT_AUTO as second parameter for decryption.

Using envelopedData.Length as length of your messageBuffer is not
the optimal solution: In case of an encrypted envelope the decrypted
length is always shorter than the envelope length, but when you try
to de-envelope a compressed envelope, you may get a longer byte
string on PopData than you pushed in.

Wolfgang Gothier


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