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// SPDX-License-Identifier: 0BSD
import { compressPoint } from "https://esm.town/v/vladimyr/libec";
import { bytesToMultibase } from "https://esm.town/v/vladimyr/libmultibase";
import { base64url } from "npm:multiformats/bases/base64";
type JWK = {
kty: "EC";
crv: string;
x: string;
y: string;
[propName: string]: unknown;
} | {
kty: "OKP";
crv: string;
x: string;
[propName: string]: unknown;
};
export function jwkToMultibase(jwk: JWK) {
if (jwk.kty === "OKP") {
const bytes = base64url.baseDecode(jwk.x);
return bytesToMultibase(bytes, jwk.crv);
}
if (jwk.kty === "EC") {
const bytes = compressPoint({
x: base64url.baseDecode(jwk.x),
y: base64url.baseDecode(jwk.y),
});
return bytesToMultibase(bytes, jwk.crv);
}
throw new TypeError("error: unsupported key type");
}
export function jwkToDidKey(jwk: JWK) {
const keyMultibase = jwkToMultibase(jwk);
return `did:key:${keyMultibase}`;
}
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April 15, 2024