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List:       ms-cryptoapi
Subject:    Re: CAPICOM (Signing and Hashing)
From:       Daniel Sie <dsie () MICROSOFT ! COM>
Date:       2001-04-27 21:33:44
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Hi Leonardo,

There is a CAPICOM@discuss.microsoft.com discussion alias for CAPICOM
questions. Click http://discuss.microsoft.com/archives/capicom.html to
join.

The signed object returns the entire PKCS 7, not just the signature.
PKCS 7 contains a lot more information that is necessary to later verify
the signature. One thing you can do to reduce the size by a bit is to
use detached signature, in which case the content itself will not be
included in the PKCS 7.

Hope this helps.

Daniel Sie

-----Original Message-----
From: Leonardo Martins dos Santos [mailto:lms@PROCENGE.COM.BR]
Sent: Friday, April 27, 2001 2:10 PM
To: CryptoAPI@DISCUSS.MICROSOFT.COM
Subject: CAPICOM (Signing and Hashing)


That was really a great idea to develop this COM, lots of thanks.

I agree that is very easy to sign a message using CAPICOM.

I'm writing an application that needs to save just the signature of a
message, I
mean the encrypted hash.

I used the method Sign as follows

s =3D Signobj.Sign(Signer, False, CAPICOM_ENCODE_BINARY)

but when I checked the content It was about 430 bytes long (I was hoping
something about 20 bytes (the hash's size)).

Did I do something wrong? How is the format of the file created?

Thanks in advance,

Leonardo Martins

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