On Sun, Nov 06, 2011, Maurice Mahieu wrote:

> I want to know if it is possible to decrypt the signature from a
> server certicate with the issuers public key using openssl.
> 

An additional data point to the comprehensive replies you've received so far.
If you literally want to "decrypt the signature" for the RSA case you can do
this either with the API or with a little more work the openssl utility
itself. There is an example of how to do this in the manual pages, see:

http://www.openssl.org/docs/apps/rsautl.html

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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