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From: Lou Losee <llosee AT gmail DOT com>
Date: Tue, 26 Jun 2012 08:11:48 -0500
Message-ID: <CA+NdcOakSDxhpk=RVZBtVS0NB=xEC9ht2r5U_=r3DmD6Mv5-Jg@mail.gmail.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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From the OpenSSL RSA man page:

To print out the components of a private key to standard output:

        openssl rsa -in key.pem -text -noout

Not explicitly in the man page, but from reading it, it appears to get
the components of the private key, the following should work:

        openssl rsa -in key.pem -pubin -pubout -text -noout

Lou

Artificial Intelligence is no match for Natural Stupidity
Artificial Intelligence is no match for Natural Stupidity


On Tue, Jun 26, 2012 at 6:01 AM, gialloporpora <gialloporpora AT gmail DOT com> 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.
>
>
> Sandro
>
>
>
>
>
>
>
>
>
>
>
>
>
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