SHA-256 not supported for RSA encryption

[clarkmcc]

I'm trying to verify the Azure attestation signature using this library and am able to successfully parse the signature, but validation fails with the following error.

pkcs7: unsupported digest "1.2.840.113549.1.1.11" for encryption algorithm "1.2.840.113549.1.1.1"

[hslatman]

Hey @clarkmcc, thank you for opening the issue. Looks like this case wasn't handled yet. I've opened a PR: #12. Need to verify the allowed algorithms. The example from Microsoft succeeds validation with this single algorithm patched.

[clarkmcc]

Fantastic news! Thanks for the quick turnaround.

[hslatman]

@clarkmcc the PR was merged. Note that we've also changed the module name in #16, so you should now be able to import it as github.com/smallstep/pkcs7.

[clarkmcc]

I meant to ask about that. I had to jump through some hoops to work around that, so this is a great improvement! Thanks for your work on this.