The sigstore npm package provides tools for signing, verifying, and managing software supply chain security. It is designed to help developers ensure the integrity and authenticity of their software artifacts.
Signing Artifacts
This feature allows you to sign software artifacts, ensuring their integrity and authenticity. The code sample demonstrates how to sign an artifact using the sigstore package.
const sigstore = require('sigstore');
async function signArtifact() {
const artifact = 'path/to/artifact';
const signature = await sigstore.sign(artifact);
console.log('Signature:', signature);
}
signArtifact();Verifying Signatures
This feature allows you to verify the signatures of software artifacts. The code sample demonstrates how to verify an artifact's signature using the sigstore package.
const sigstore = require('sigstore');
async function verifySignature() {
const artifact = 'path/to/artifact';
const signature = 'signature-of-artifact';
const isValid = await sigstore.verify(artifact, signature);
console.log('Is valid:', isValid);
}
verifySignature();Managing Keys
This feature allows you to generate and manage cryptographic keys. The code sample demonstrates how to generate a key pair using the sigstore package.
const sigstore = require('sigstore');
async function manageKeys() {
const keyPair = await sigstore.generateKeyPair();
console.log('Public Key:', keyPair.publicKey);
console.log('Private Key:', keyPair.privateKey);
}
manageKeys();The openpgp package provides tools for OpenPGP encryption and signing. It offers similar functionalities to sigstore, such as signing and verifying artifacts, but it is based on the OpenPGP standard.
The node-jose package is a JavaScript Object Signing and Encryption (JOSE) library. It provides tools for signing, verifying, and encrypting data, similar to sigstore, but it focuses on the JOSE standards.
The jsonwebtoken package is used for signing and verifying JSON Web Tokens (JWT). While it is primarily focused on JWTs, it offers similar signing and verification functionalities as sigstore.
⚠️ This project is not ready for general-purpose use! ⚠️
A tool for signing and verifying signatures using JavaScript. One of the intended uses is to sign and verify npm packages but it can be used to sign and verify any file.
Docker is required to generate protobufs for the .sigstore bundle format.
Install Docker on MacOS using Homebrew:
brew install --cask docker && open -a Docker
View Docker install instructions for other platforms.
Update the Git REF in hack/generate-bundle-types from the sigstore/cosign repository.
Generate TypeScript protobufs (should update files in scr/types/bundle/__generated__):
npm run codegen:bundle
Update the git REF in hack/generate-rekor-types from the sigstore/rekor repository.
Generate TypeScript types (should update files in scr/types/rekor/__generated__):
npm run codegen:rekor
Start by cloning this repo then, from the root of the repo, execute the following to install the dependencies and transpile the TypeScript source:
$ npm install && npm run build
First generate the artifact to be signed:
$ npm pack
npm notice
npm notice 📦 sigstore@0.0.0
npm notice === Tarball Contents ===
npm notice 354B README.md
npm notice 58B bin/sigstore.js
npm notice 2.3kB dist/cli/index.js
npm notice 1.3kB dist/crypto.js
npm notice 345B dist/dsse.js
npm notice 516B dist/error.js
npm notice 1.5kB dist/fulcio.js
npm notice 1.9kB dist/identity/ci.js
npm notice 1.3kB dist/identity/gha.js
npm notice 1.0kB dist/identity/index.js
npm notice 1.3kB dist/identity/issuer.js
npm notice 6.4kB dist/identity/oauth.js
npm notice 77B dist/identity/provider.js
npm notice 260B dist/index.js
npm notice 3.4kB dist/rekor.js
npm notice 2.9kB dist/sign.js
npm notice 2.9kB dist/sigstore.js
npm notice 1.5kB dist/util.js
npm notice 1.7kB dist/verify.js
npm notice 1.3kB package.json
npm notice === Tarball Details ===
npm notice name: sigstore
npm notice version: 0.0.0
npm notice filename: sigstore-0.0.0.tgz
npm notice package size: 8.6 kB
npm notice unpacked size: 32.4 kB
npm notice shasum: 44373924818c21f235f7e5aac514b172f1966243
npm notice integrity: sha512-E+IgEuBoN6SQP[...]gKx2Bnuuj9Xcg==
npm notice total files: 20
npm notice
sigstore-0.0.0.tgz
Generate a signature for the package with the following:
$ ./bin/sigstore.js sign ./sigstore-0.0.0.tgz > bundle.sigstore
Created entry at index 4524464, available at
https://rekor.sigstore.dev/api/v1/log/entries?logIndex=4524464
You should see that a browser window is opened to the Sigstore OAuth page. After authenticating with one of the available idenity providers, a signature bundle will be generated and written to the file named "signature".
$ cat bundle.sigstore | jq
{
"mediaType": "application/vnd.dev.sigstore.bundle+json;version=0.1",
"timestampVerificationData": {
"tlogEntries": [
{
"logIndex": "4524464",
"logId": "wNI9atQGlz+VWfO6LRygH4QUfY/8W4RFwiT5i5WRgB0=",
"kindVersion": {
"kind": "hashedrekord",
"version": "0.0.1"
},
"integratedTime": "1665008899",
"inclusionPromise": "MEQCIEI1EN2M0ShxStSBfoaS+mmDnk0Yhl68pjyMZ77WJrdNAiB7MDvTJ6+YbznLR1BhwKANUH1PtoorXnsjBnSDvs943Q=="
}
],
"rfc3161Timestamps": []
},
"verificationMaterial": {
"x509CertificateChain": {
"certificates": [
"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",
"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",
"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"
]
}
},
"messageSignature": {
"messageDigest": {
"algorithm": "SHA2_256",
"digest": "FArN5VHf77/gtqmyQJ3vaL8t7LskOE8ThkOZlGJHaTw="
},
"signature": "MEUCID/iVOISFCfZXEFW3IrcWXQgLDfPHRxPZBWlgDOGmXmlAiEAgi02Imw+bFQlIKeyKKpk0i60KRw7djRkA/NY6LKhI5A="
}
}
You'll see that the signature bundle contains the SHA256 digest of the artifact, the signature, the signing certificate and metadata about the entry which was made in Rekor.
You can extract and view the signing certificate with the following:
$ cat bundle.sigstore | jq --raw-output '.verificationMaterial.x509CertificateChain.certificates[0]' | base64 -d | openssl x509 -inform der -text
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
46:4d:7a:bf:65:b1:59:7f:97:c2:d9:9d:91:48:7e:1b:e5:08:b4:fa
Signature Algorithm: ecdsa-with-SHA384
Issuer: O = sigstore.dev, CN = sigstore-intermediate
Validity
Not Before: Oct 5 22:28:19 2022 GMT
Not After : Oct 5 22:38:19 2022 GMT
Subject:
Subject Public Key Info:
Public Key Algorithm: id-ecPublicKey
Public-Key: (256 bit)
pub:
04:8d:f5:3a:26:c9:e2:7d:24:cc:99:1d:d1:52:81:
67:c9:51:09:d9:05:1a:a7:5b:66:a3:27:84:0b:4d:
9e:fc:dc:03:f4:9f:c1:d7:88:e7:d5:08:a8:a5:0a:
47:fd:f9:9b:d8:ef:ce:7c:d0:5c:2d:56:30:f7:fc:
01:13:04:76:fc
ASN1 OID: prime256v1
NIST CURVE: P-256
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature
X509v3 Extended Key Usage:
Code Signing
X509v3 Subject Key Identifier:
AE:CD:A1:C5:18:1C:64:25:74:6C:B9:8D:F6:AD:E0:25:1B:27:2B:71
X509v3 Authority Key Identifier:
DF:D3:E9:CF:56:24:11:96:F9:A8:D8:E9:28:55:A2:C6:2E:18:64:3F
X509v3 Subject Alternative Name: critical
email:brian@dehamer.com
1.3.6.1.4.1.57264.1.1:
https://github.com/login/oauth
CT Precertificate SCTs:
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 08:60:92:F0:28:52:FF:68:45:D1:D1:6B:27:84:9C:45:
67:18:AC:16:3D:C3:38:D2:6D:E6:BC:22:06:36:6F:72
Timestamp : Oct 5 22:28:19.234 2022 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:46:02:21:00:83:8B:17:2E:4A:D6:E3:D6:D4:90:25:
19:52:74:8E:81:72:4F:8F:A6:0D:4E:27:DE:58:65:63:
0D:0D:92:EC:75:02:21:00:8A:83:15:8B:0D:86:D6:87:
9C:99:A9:8E:44:43:E3:93:3F:23:55:BC:73:4B:45:FA:
CF:76:07:65:15:15:C3:B8
Signature Algorithm: ecdsa-with-SHA384
Signature Value:
30:66:02:31:00:c1:da:2a:2a:2a:4e:8a:3e:20:f6:37:87:99:
fb:8e:5a:9e:40:d2:d4:84:04:de:5f:1e:58:da:c4:68:2c:0a:
ac:cc:68:f1:67:e5:31:e3:11:5c:85:a1:5e:42:44:ff:3a:02:
31:00:be:eb:da:c9:39:58:a3:5b:c0:84:4a:8a:c3:a1:b6:a4:
34:2e:e1:1a:f7:4c:03:40:bc:11:90:7f:ff:93:e1:be:72:af:
39:bc:60:00:6a:6c:56:98:a3:1f:4e:b9:12:77
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
The SAN in the certificate should match the identity that was used to authenticate with the OAuth provider.
Using the Rekor URL displayed as part of the signing process you should also be able to retrieve the Rekor entry for this signature:
$ curl --silent "https://rekor.sigstore.dev/api/v1/log/entries?logIndex=4524464" \
| jq --raw-output '.[].body' \
| base64 --decode \
| jq
{
"apiVersion": "0.0.1",
"kind": "hashedrekord",
"spec": {
"data": {
"hash": {
"algorithm": "sha256",
"value": "140acde551dfefbfe0b6a9b2409def68bf2decbb24384f13864399946247693c"
}
},
"signature": {
"content": "MEUCID/iVOISFCfZXEFW3IrcWXQgLDfPHRxPZBWlgDOGmXmlAiEAgi02Imw+bFQlIKeyKKpk0i60KRw7djRkA/NY6LKhI5A=",
"publicKey": {
"content": "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"
}
}
}
}
Note that the .spec.signature.content value matches the signature that was
saved locally.
Use the verify command to make sure that the saved signature matches
the artifact:
$ ./bin/sigstore.js verify bundle.sigstore sigstore-0.0.0.tgz
Signature verified OK
This will use the signing certificate to ensure that the SHA256 digest encoded in the supplied signature matches the digest of the package itself. A future iteration of the verification logic will also find and verify the corresponding entry in the Rekor log.
sigstore-js is licensed under the Apache 2.0 License.
See the contributing docs for details.
Everyone interacting with this project is expected to follow the sigstore Code of Conduct.
Should you discover any security issues, please refer to sigstore's security process.
sigstore-js is developed as part of the sigstore project.
We also use a slack channel! Click here for the invite link.
FAQs
code-signing for npm packages
The npm package sigstore receives a total of 3,782,135 weekly downloads. As such, sigstore popularity was classified as popular.
We found that sigstore demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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