Signature verification with capicom

From: Marco (tiodemo_at_hotmail.com)
Date: 01/28/04 

Date: 28 Jan 2004 06:53:02 -0800

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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