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Testing for SHA-2 compatibility on an application

Posted on 2016-09-09
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Last Modified: 2016-09-19
I am in the process of upgrading my SHA1 certificates to SHA-256. Before I do anything I want to check application compatibility with SHA-2. I could just create a new SHA-256 cert and test it out but wanted to see if there is another way?
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Question by:YZlat
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btan earned 500 total points
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If you meant to test your appl for sha2  interoperability, I should say go through the same regime of staging environment and test with your data set as the storage of hash output increased as compared to sha1. This is applicable if your have your DB  storing those output.

In term of performance issue, ther should not be until actual measurements are performed. Hash functions are fast. In most situations, hash function performance has only negligible impact; using the computing hardware these day in even have any detecting of such change could prove difficult. Security must comes first.

Otherwise if it is just upgrade of (let say) SSL cert for web based check and compliant, you can check out ssl test online which covers server and client (browser)
(look at some of the listed toolkit set to check on weak cipher)
https://www.owasp.org/index.php/Testing_for_Weak_SSL/TLS_Ciphers,_Insufficient_Transport_Layer_Protection_(OTG-CRYPST-001)#Testing_for_Weak_SSL.2FTLS_Cipher_Suites.

You can consider iiscrypto tool if you are using Windows. This tool read the Registry and show the cipher used and baseline for the Windows OS platform. See this EE discussion.
https://www.experts-exchange.com/questions/28961303/Enterprise-CA-TLS-1-2-Template.html#a41741956

Testing is rather specific to your use case, you will need to plan out the test instead.
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by:YZlat
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Actually I was looking to test whether a particular app would work with new SHA-2 certificate
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by:btan
btan earned 500 total points
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You can access the service with the certificate replaced. The tool will ensure the certificate binded to your service is as expected.
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by:YZlat
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Thanks for some useful info
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