Function deriveSecretKeyTreeRoot

packages/happy-agent/src/encryption.ts:49–55

(seed: Uint8Array, usage: string)

};

export function deriveSecretKeyTreeRoot(seed: Uint8Array, usage: string): KeyTreeState {
    const I = hmac_sha512(new TextEncoder().encode(usage + ' Master Seed'), seed);
    return {
        key: I.slice(0, 32),
        chainCode: I.slice(32),
    };
}

export function deriveSecretKeyTreeChild(chainCode: Uint8Array, index: string): KeyTreeState {
    const data = new Uint8Array([0x00, ...new TextEncoder().encode(index)]);