Signature verification with capicom

From: Ramesh Addanki (rbaddanki_at_rediffmail.com)
Date: 01/28/04 

Date: Wed, 28 Jan 2004 10:04:43 -0800

Well, it looks like byte ordering problem - Big endian Vs
Little endian. What you need to do is before calling the
sign verify reverse the entire buffer.

>-----Original Message-----
>Hi everybody,
>
> I'm developing an application that signs a pdf file
with iaik
>libraries in java and verify the signature created in
visual basic.
>I'm using the capicom libraries, the sign process goes
well but in the
>verify process, capicom says that the hashes don't match.
Iaik sends
>an ans1 object encoded in base64, that match with the one
generated
>with capicom but the hash created from the original file.
> If I make the hash with iaik with a plain text file, it
returns the
>correct hash, but i I do the same with capicom (with
>CAPICOM.hashedData object), it returns other hash, and I
have to call
>this function (extracted from the capicom examples):
>
>Function Unicode2Ansi(unicodestring)
> Dim lngLoop
> Dim strChar
> Ustr2Bstr = ""
>
> For lngLoop = 1 To Len(unicodestring)
> strChar = Mid(unicodestring, lngLoop, 1)
> Unicode2Ansi = Unicode2Ansi & ChrB(AscB(strChar))
> Next
>End Function
>
>and later do the hash to get the correct value. Finally I
will use pdf
>files (not plain text files, i use them only for
tests). 'what can I
>do to sing pdf files and make capicom understand the hash
that iaik
>creates (well created)??
>
>Thanks in advice,
>
>Marco Antonio Tabasco
>.
>

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