Thank you for the suggestion. As per the information I searched, the version of 
OpenSSL on my system (0.9.7d) doesn't support SHA256/512. Upgradation from 
0.9.7d to any other latest is slated for the future.



--- On Tue, 27/10/09, Dan Anderson <opensolaris at drydog.com> wrote:

From: Dan Anderson <[email protected]>
Subject: Re: How to change the signature algorithm from MD5 to SHA1 in OpenSSL
To: security-discuss at opensolaris.org
Date: Tuesday, 27 October, 2009, 10:05 PM

If you're going to go through the trouble of changing the signature algorithm 
from MD5, choose a strong algorithm instead of another weak one.? SHA1, 
although not as weak as MD5, is not recommended either.? See this comnment from 
NIST:

"NIST Comments on Cryptanalytic Attacks on SHA-1"
http://csrc.nist.gov/groups/ST/hash/statement.html
Basically, it says you should use the SHA2 family (SHA224, SHA256, SHA384, or 
SHA512).

# openssl.cnf
default_md = sha512
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