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import cbor from 'cbor';
/**
* Convert authenticator extension data buffer to a proper object
*
* @param extensionData Authenticator Extension Data buffer
*/
export function decodeAuthenticatorExtensions(
extensionData: Buffer,
): AuthenticationExtensionsAuthenticatorOutputs | undefined {
let toCBOR: AuthenticationExtensionsAuthenticatorOutputs | undefined;
try {
toCBOR = cbor.decodeAllSync(extensionData)[0];
} catch (err) {
const _err = err as Error;
throw new Error(`Error decoding authenticator extensions: ${_err.message}`);
}
return toCBOR;
}
export type AuthenticationExtensionsAuthenticatorOutputs = {
devicePublicKey?: DevicePublicKeyAuthenticatorOutput;
uvm?: UVMAuthenticatorOutput;
};
export type DevicePublicKeyAuthenticatorOutput = {
dpk?: Buffer;
scp?: Buffer;
sig?: string;
aaguid?: Buffer;
};
// TODO: Need to verify this format
// https://w3c.github.io/webauthn/#sctn-uvm-extension.
export type UVMAuthenticatorOutput = {
uvm?: Buffer[];
};
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