[openssl-users] Help with making a SHA >1 certificate

Jakob Bohm jb-openssl at wisemo.com
Tue Nov 7 07:34:22 UTC 2017

Both the validity and the hash in the certificate are decided by the
"ca" command, which you didn't tell about wanting sha512 and 10 years.

sha512 on req determines only the hash used by the requestor to prove
he has the private key and sign the name etc. *suggested* to the ca.

-days on req when generating a request does noting, and should perhaps
produce a warning, since this option is only meaningful when used with
the -x509 option to produce a self-signed cert instead of a request.

On 06/11/2017 23:04, Charles Mills wrote:
> Please forgive my ignorance here. I’m really not a certificate expert. 
> I’m a software developer trying to make certificates to use in a 
> testing situation.
> I’ve got some scripts that I have been using for years. I’ve just 
> upgraded to 1.10f (but there are no upgrade issues that I know of – 
> that’s not the problem).
> My last test certificate expired. So I am trying to make another one. 
> All I seem to be able to make are SHA-1 signed certificates, but I’m 
> trying to load them into a FIPS-140 (non-OpenSSL) key repository and 
> it is failing, I think because of the SHA-1. Here is how I am making 
> the certificate. What do I have to do differently to make a SHA-512 
> (or at least some SHA > 1) certificate?
> C:\OpenSSL-Win32-110f\bin\openssl.exe req -newkey rsa:2048 -sha512 
> -keyout %1.key.pem -out %1.req.pem -config 
> openssl_edited_win32_default.cfg -extensions usr_cert -reqexts 
> usr_cert -nodes -days 3650
> C:\OpenSSL-Win32-110f\bin\openssl req -text -in %1.req.pem -sha512
> C:\OpenSSL-Win32-110f\bin\openssl.exe ca -in %1.req.pem -config 
> CMC_root_config.cnf -out %1.pem -verbose -cert CMC_root.pem -keyfile 
> CMC_root.key.pem -passin pass:password
> Here is what I end up with:
>     Signature Algorithm: sha1WithRSAEncryption
>         Issuer: CN=Charles Mills Consulting, LLC, ST=California, 
> C=US/emailAddress=charlesm at mcn.org, O=Charles Mills Consulting, LLC
>         Validity
>             Not Before: Nov  6 19:13:09 2017 GMT
>             Not After : Nov  6 19:13:09 2018 GMT
>         Subject: CN=Charles Mills Consulting, LLC, ST=California, 
> C=US/emailAddress=charlesm at mcn.org, O=CZAGENT_Nov2017
>         Subject Public Key Info:
>             Public Key Algorithm: rsaEncryption
>                 Public-Key: (2048 bit)
> While we’re at it, why doesn’t my –days 3650 seem to have any effect?
> Thanks!
> /Charles /


Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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