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Romuald QuantinR
Deno•4y ago•
2 replies
Romuald Quantin

How to create a crypto key to use with JWT from a Github pem file

Hi, I'm running into some difficulties to create a CryptoKey from a pem file.
The pem key is created from this: https://docs.github.com/en/developers/apps/building-github-apps/authenticating-with-github-apps#authenticating-as-a-github-app
The key format seems to be "ASN1", the error I'm getting: 
unexpected ASN.1 DER tag: expected SEQUENCE, got INTEGER at DER byte 7 DataError: unexpected ASN.1 DER tag: expected SEQUENCE, got INTEGER at DER byte 7
unexpected ASN.1 DER tag: expected SEQUENCE, got INTEGER at DER byte 7 DataError: unexpected ASN.1 DER tag: expected SEQUENCE, got INTEGER at DER byte 7

What I'm trying to execute: 
crypto.subtle.importKey(
        'pkcs8',
        binaryDer,
        {
            name: 'RSASSA-PKCS1-v1_5',
            hash: 'SHA-256',
        },
        true,
        ['sign'],
    );
crypto.subtle.importKey(
        'pkcs8',
        binaryDer,
        {
            name: 'RSASSA-PKCS1-v1_5',
            hash: 'SHA-256',
        },
        true,
        ['sign'],
    );

This is also describing the issue: https://github.com/denoland/deno/issues/13907
Can someone help?
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