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Date: Tue, 26 Jun 2012 13:59:12 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [OpenSSL]Is it possible to show the numerical value of the public and private key's exponent in a certificate
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On Jun 26 13:01, gialloporpora wrote:
> Dear all,
> I am trying to learn how S/MIME encryption/digital signing works.
> 
> I would like to show the numerical values assigned to my private and
> public key.
> 
> I have converted my personal certificate from p12 to pem, in this way:
> 
> openssl pkcs12 -in mycert.p12 -out mycert.pem
> 
> Now, I have used this command to show the modulus of the private/public key:
> 
>     openssl rsa -in mykey.pem -noout -modulus
> 
> and I see an hexadecimal value, now I know that my public key is a
> data like this:
> 
> (exp1, modulus)
> 
> 
> 
> where modulus is the value above. My private key is:
> 
> (exp2, modulus)
> 
> where exp1 and exp2 satisfy:
> 
> exp1*exp2 ? 1 mod (p-1)(q-1)
> modulus=p*q
> 
> I would like to know if is it possible to show the numerical values
> of exp1 and exp2 stored in my certificate.

Since this is a OpenSSL question, you will probably have more luck
asking on the appropriate openssl-users mailing list:

  http://www.openssl.org/support/community.html


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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