@sigstore/sign 3.1.0

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/%40sigstore/sign@3.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40sigstore/sign@3.1.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:fd639efd0a448d7448fe4c3ae84ff64be2f7eba743a3986c3fd03d83839cf4c2","contract":["MessageSignatureBundleBuilder.create signs raw artifact bytes, hashes the payload with SHA-256, attaches witness transparency log and RFC3161 timestamp entries, and returns a v0.2 messageSignature bundle","DSSEBundleBuilder.create applies DSSEv1 pre-authentication encoding before invoking the signer and packages the artifact into a v0.3 dsseEnvelope bundle with publicKey hint and witness materials","InternalError wraps signing failures with a structured error code, message, and underlying cause"],"goal":"verify pkg:npm/%40sigstore/sign@3.1.0","kind":"HOW","packages":["pkg:npm/%40sigstore/sign@3.1.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40sigstore/sign@3.1.0"],"schemaVersion":1,"subject":"pkg:npm/%40sigstore/sign@3.1.0","verifierAdapter":"node-typescript@1"}

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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sigstore-sign-sample",
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      }
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}

{
  "name": "sigstore-sign-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@sigstore/sign": "3.1.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40sigstore/sign@3.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40sigstore/sign@3.1.0"
  ]
}

import crypto from 'node:crypto';
import {
  DSSEBundleBuilder,
  InternalError,
  MessageSignatureBundleBuilder,
} from '@sigstore/sign';

export function createMemorySigner(keyIdentifier = 'sample-key-hint') {
  const { privateKey, publicKey } = crypto.generateKeyPairSync('ec', {
    namedCurve: 'P-256',
  });
  const exportedPublic = publicKey.export({ type: 'spki', format: 'der' }).toString('base64');
  const signedPayloads = [];

  const signer = {
    async sign(data) {
      signedPayloads.push(Buffer.from(data));
      const signature = crypto.sign('sha256', data, privateKey);
      return {
        signature,
        key: {
          $case: 'publicKey',
          publicKey: exportedPublic,
          hint: keyIdentifier,
        },
      };
    },
  };

  return { signer, publicKey, exportedPublic, signedPayloads };
}

export function createMemoryWitness(logIndex = '42') {
  const calls = [];
  const witness = {
    async testify(content, pubKey) {
      calls.push({ contentCase: content.$case, pubKey });
      return {
        tlogEntries: [
          {
            logIndex,
            logId: { keyId: Buffer.from('log-id-bytes') },
            kindVersion: { kind: 'hashedrekord', version: '0.0.1' },
            integratedTime: '1700000000',
            inclusionPromise: undefined,
            inclusionProof: undefined,
            canonicalizedBody: Buffer.from('{}'),
          },
        ],
        rfc3161Timestamps: [
          {
            signedTimestamp: Buffer.from('signed-ts-bytes'),
          },
        ],
      };
    },
  };
  return { witness, calls };
}

export async function buildMessageBundle(payloadBytes) {
  const { signer, publicKey, exportedPublic, signedPayloads } = createMemorySigner('msg-key-1');
  const { witness, calls } = createMemoryWitness('101');
  const builder = new MessageSignatureBundleBuilder({
    signer,
    witnesses: [witness],
  });

  const bundle = await builder.create({
    data: payloadBytes,
  });

  return { bundle, publicKey, exportedPublic, signedPayloads, witnessCalls: calls };
}

export async function buildAttestationBundle(payloadBytes, payloadType) {
  const { signer, publicKey, signedPayloads } = createMemorySigner('dsse-key-1');
  const { witness, calls } = createMemoryWitness('202');
  const builder = new DSSEBundleBuilder({
    signer,
    witnesses: [witness],
  });

  const bundle = await builder.create({
    data: payloadBytes,
    type: payloadType,
  });

  return { bundle, publicKey, signedPayloads, witnessCalls: calls };
}

export function wrapSigningFailure(code, message, cause) {
  return new InternalError({ code, message, cause });
}

import assert from 'node:assert/strict';
import crypto from 'node:crypto';
import {
  buildAttestationBundle,
  buildMessageBundle,
  wrapSigningFailure,
} from '../src/index.mjs';
import { InternalError } from '@sigstore/sign';

const messageData = Buffer.from('artifact-binary-payload');
const msgResult = await buildMessageBundle(messageData);

assert.equal(msgResult.bundle.mediaType, 'application/vnd.dev.sigstore.bundle+json;version=0.2');
assert.equal(msgResult.bundle.content.$case, 'messageSignature');

const expectedDigest = crypto.createHash('sha256').update(messageData).digest();
assert.deepEqual(
  msgResult.bundle.content.messageSignature.messageDigest.digest,
  expectedDigest
);

assert.equal(msgResult.signedPayloads.length, 1);
assert.deepEqual(msgResult.signedPayloads[0], messageData);
assert.equal(
  crypto.verify(
    'sha256',
    messageData,
    msgResult.publicKey,
    msgResult.bundle.content.messageSignature.signature
  ),
  true
);

assert.equal(msgResult.bundle.verificationMaterial.content.$case, 'publicKey');
assert.equal(
  msgResult.bundle.verificationMaterial.content.publicKey.hint,
  'msg-key-1'
);
assert.equal(msgResult.bundle.verificationMaterial.tlogEntries.length, 1);
assert.equal(msgResult.bundle.verificationMaterial.tlogEntries[0].logIndex, '101');
assert.equal(
  msgResult.bundle.verificationMaterial.timestampVerificationData.rfc3161Timestamps.length,
  1
);
assert.equal(msgResult.witnessCalls.length, 1);
assert.equal(msgResult.witnessCalls[0].contentCase, 'messageSignature');
assert.equal(msgResult.witnessCalls[0].pubKey, msgResult.exportedPublic);

const statementBytes = Buffer.from('{"_type":"statement-v1"}');
const statementType = 'application/vnd.in-toto+json';
const dsseResult = await buildAttestationBundle(statementBytes, statementType);

assert.equal(dsseResult.bundle.mediaType, 'application/vnd.dev.sigstore.bundle.v0.3+json');
assert.equal(dsseResult.bundle.content.$case, 'dsseEnvelope');
assert.equal(dsseResult.bundle.content.dsseEnvelope.payloadType, statementType);
assert.deepEqual(dsseResult.bundle.content.dsseEnvelope.payload, statementBytes);
assert.equal(dsseResult.bundle.content.dsseEnvelope.signatures.length, 1);
assert.equal(dsseResult.bundle.content.dsseEnvelope.signatures[0].keyid, 'dsse-key-1');

const expectedPAE = Buffer.from(
  `DSSEv1 ${statementType.length} ${statementType} ${statementBytes.length} `
);
assert.equal(dsseResult.signedPayloads.length, 1);
assert.equal(
  dsseResult.signedPayloads[0].subarray(0, expectedPAE.length).equals(expectedPAE),
  true
);
assert.equal(
  crypto.verify(
    'sha256',
    dsseResult.signedPayloads[0],
    dsseResult.publicKey,
    dsseResult.bundle.content.dsseEnvelope.signatures[0].sig
  ),
  true
);
assert.equal(dsseResult.bundle.verificationMaterial.tlogEntries[0].logIndex, '202');

const rootCause = new Error('underlying failure');
const wrapped = wrapSigningFailure('CA_CREATE_SIGNING_CERTIFICATE_ERROR', 'signing failed', rootCause);
assert.equal(wrapped instanceof Error, true);
assert.equal(wrapped instanceof InternalError, true);
assert.equal(wrapped.name, 'InternalError');
assert.equal(wrapped.code, 'CA_CREATE_SIGNING_CERTIFICATE_ERROR');
assert.equal(wrapped.message, 'signing failed');
assert.equal(wrapped.cause, rootCause);