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wbond / oscrypto

Compiler-free Python crypto library backed by the OS, supporting CPython and PyPy
MIT License
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Allow asn1crypto.keys.PublicKeyInfo when an instance of the Certificate or PublicKey class are required #65

Closed BrunoVernay closed 1 year ago

BrunoVernay commented 2 years ago

It does not seem logical to me to get this error TypeError: certificate_or_public_key must be an instance of the Certificate or PublicKey class, not asn1crypto.keys.PublicKeyInfo When trying to do this:

        info = cms.ContentInfo.load(f.read())
        pubkey = info['content']['certificates'][0].chosen.public_key
        asymmetric.rsa_pkcs1v15_verify(pubkey, signature_value, signed_data, 'sha256')

But maybe I am wrong (and I cannot find an easy way to convert PublicKeyInfo to PublicKey ....)

niklbird commented 1 year ago

Hey, I am trying to do the same thing, would you mind sharing how you solved this? :) Thank you!

wbond commented 1 year ago

This should do it:

public_key = oscrypto.keys.parse_public(pubkey.dump())

What you are doing is dumping the ASN.1 representation of the public key to a byte string and then loading that up into an OS-specific format that can be used with asymmetric.rsa_pkcs1v15_verify().

https://github.com/wbond/oscrypto/blob/master/docs/keys.md#parse_public-function