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import { isoCBOR, isoUint8Array } from './iso/index.ts';
import { COSEKEYS, COSEPublicKeyEC2 } from './cose.ts';
/**
* Takes COSE-encoded public key and converts it to PKCS key
*/
export function convertCOSEtoPKCS(cosePublicKey: Uint8Array): Uint8Array {
// This is a little sloppy, I'm using COSEPublicKeyEC2 since it could have both x and y, but when
// there's no y it means it's probably better typed as COSEPublicKeyOKP. I'll leave this for now
// and revisit it later if it ever becomes an actual problem.
const struct = isoCBOR.decodeFirst<COSEPublicKeyEC2>(cosePublicKey);
const tag = Uint8Array.from([0x04]);
const x = struct.get(COSEKEYS.x);
const y = struct.get(COSEKEYS.y);
if (!x) {
throw new Error('COSE public key was missing x');
}
if (y) {
return isoUint8Array.concat([tag, x, y]);
}
return isoUint8Array.concat([tag, x]);
}
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