[openssl-users] question about resigning a certificate

Jakob Bohm jb-openssl at wisemo.com
Tue Mar 17 19:49:57 UTC 2015

On 16/03/2015 02:46, Alex Samad - Yieldbroker wrote:
> Hi
> I had a sha1 signed CA and I issued other  identity and CA certificates from this CA.
> With the deprecation of sha1 coming, I resigned my original CA (self signed) as sha512, with the same creation and expiry dates. I believe the only thing changed was the signature and serial number.
> But when I go to verify older certs that were signed by the original CA (the sha1 signed one), they are no longer valid.
> I thought if I used the same private and public key I should be okay. I thought the only relevant issue was the issuer field and that the CA keys where the same . Was I wrong.
> Alex
Run openssl x509 -noout -text -in OneOfYourIssuedCerts.pem| more

Look at what aspects of your CA are mentioned.  For example,
does it include the "X509v3 Authority Key Identifier"
extension, and if so, which fields from the CA cert are


Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded

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