ACM OCSP Request support for SHA256

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Hello!

I have a working check on using OCSP request to ACM on a private cert authority using SHA1 via https://cryptography.io/en/3.4/x509/ocsp.html

When I switch to SHA256 instead of SHA1 though, I get errors from ACM. Does ACM OSCP support SHA256 or only SHA1? I can't find any supporting documentation that clarifies this.

AWS
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Amazon ACM (AWS Certificate Manager) does support OCSP (Online Certificate Status Protocol) for certificate validation. Regarding the hash algorithm used, ACM supports SHA-256 for generating the digital signature in the OCSP response. https://docs.aws.amazon.com/acm/

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  • I have yet to see a request work with SHA256 OCSP request. Here is an openssl example: openssl ocsp -issuer truststore.pem -sha256 -cert cert.pem -text -url http://ocsp.acm-pca.us-east-1.amazonaws.com this fails

    openssl ocsp -issuer truststore.pem -cert cert.pem -text -url http://ocsp.acm-pca.us-east-1.amazonaws.com this succeeds (SHA1 default)

    So far every OCSP request made to ACM built with anything but SHA1 encoding fails. Is this a bug?

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