Method sign

sdk/js/src/index.ts:357–376

* Signs a payload using a derived key. * @param algorithm The algorithm to use (e.g., "ed25519", "secp256k1", "secp256k1_prehashed") * @param data The data to sign. If algorithm is "secp256k1_prehashed", this must be a 32-byte hash. * @returns A SignResponse containing the signature, signat

(algorithm: string, data: string | Buffer | Uint8Array)

   * @returns A SignResponse containing the signature, signature chain, and public key.
   */
  async sign(algorithm: string, data: string | Buffer | Uint8Array): Promise<SignResponse> {
    const hexData = to_hex(data);
    if (algorithm === 'secp256k1_prehashed' && hexData.length !== 64) {
        throw new Error(`Pre-hashed signing requires a 32-byte digest, but received ${hexData.length / 2} bytes`);
    }

    const payload = JSON.stringify({
        algorithm: algorithm,
        data: hexData
    });

    const result = await send_rpc_request<{ signature: string, signature_chain: string[], public_key: string }>(this.endpoint, '/Sign', payload);

    return Object.freeze({
        signature: new Uint8Array(Buffer.from(result.signature, 'hex')),
        signature_chain: result.signature_chain.map(sig => new Uint8Array(Buffer.from(sig, 'hex'))),
        public_key: new Uint8Array(Buffer.from(result.public_key, 'hex')),
        __name__: 'SignResponse',
    });
  }

  /**
   * Verifies a payload signature.