[Cryptography-dev] Compute issuerKeyHash

[Alex Gaynor]

You want Encoding.DER, not PEM.

Alex

On Thu, Sep 16, 2021 at 11:51 AM pepone.onrez <pepone.onrez at gmail.com> wrote:
>
> Hi,
>
> Is there a way to compute the issuer key hash from the certificate issuer?
>
> I tried with:
>
> public_key = issuer_cert.public_key().public_bytes(
>     Encoding.PEM,
>     PublicFormat.SubjectPublicKeyInfo)
> print(hashlib.sha1(public_key).digest())
>
> This doesn't seem to be it, I was previously using oscrypto
>
> issuerSha1 = cert.asn1.public_key.sha1
>
> is there a way to get this info with pyca/cryptography?
>
> Cheers,
> Jose
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