PeculiarVentures/webcrypto

A WebCrypto Polyfill for NodeJS

TypeScript

202

253 commits

updated Oct 8, 2026

See the code

README

@peculiar/webcrypto

NPM License GitHub Actions Workflow Status npm version Coveralls npm downloads

We wanted to be able to write Javascript that used crypto on both the client and the server but we did not want to rely on Javascript implementations of crypto. The only native cryptography available in browser is Web Crypto, this resulted in us creating a @peculiar/webcrypto.

Table Of Contents

WARNING

At this time this solution should be considered suitable for research and experimentation, further code and security review is needed before utilization in a production application.

Module is based on the Node.js crypto API. It requires Node v14.18.0 or higher.

Installing

npm install @peculiar/webcrypto

Supported algorithms

Algorithm namegenerateKeydigestexport/importsign/verifyencrypt/decryptwrapKey/unwrapKeyderive
SHA-1X
SHA-256X
SHA-384X
SHA-512X
HMACXXX
RSASSA-PKCS1-v1_5XXX
RSAES-PKCS1-v1_52XXXX
RSA-PSSXXX
RSA-OAEPXXXX
AES-CMACXXX
AES-CBCXXXX
AES-CTRXXXX
AES-ECBXXXX
AES-GCMXXXX
AES-KWXXX
ECDSA1XXX
ECDH1XXX
EdDSA2,3XXX
ECDH-ES2,4XXX
HKDFXX
PBKDF2XX
DES-CBC2XXXX
DES-EDE3-CBC2XXXX
shake1282X
shake2562X

1 Mechanism supports extended list of named curves P-256, P-384, P-521, K-256, brainpoolP160r1, brainpoolP160t1, brainpoolP192r1, brainpoolP192t1, brainpoolP224r1, brainpoolP224t1, brainpoolP256r1, brainpoolP256t1, brainpoolP320r1, brainpoolP320t1, brainpoolP384r1, brainpoolP384t1, brainpoolP512r1, and brainpoolP512t1

2 Mechanism is not defined by the WebCrypto specifications. Use of mechanism in a safe way is hard, it was added for the purpose of enabling interoperability with an existing system. We recommend against its use unless needed for interoperability.

3 Mechanism supports extended list of named curves Ed25519, and Ed448

4 Mechanism supports extended list of named curves X25519, and X448

Using

const { Crypto } = require("@peculiar/webcrypto");

const crypto = new Crypto();

Examples

See WebCrypto Docs for examples

Bug Reporting

Please report bugs either as pull requests or as issues in the issue tracker. @peculiar/webcrypto has a full disclosure vulnerability policy. Please do NOT attempt to report any security vulnerability in this code privately to anybody.

aes
crypto
des
ec
hmac
pbkdf2
rsa
sha
webcrypto

PeculiarVentures/webcrypto

A WebCrypto Polyfill for NodeJS

TypeScript

202

253 commits

updated Oct 8, 2026

See the code

README

@peculiar/webcrypto

NPM License GitHub Actions Workflow Status npm version Coveralls npm downloads

We wanted to be able to write Javascript that used crypto on both the client and the server but we did not want to rely on Javascript implementations of crypto. The only native cryptography available in browser is Web Crypto, this resulted in us creating a @peculiar/webcrypto.

Table Of Contents

WARNING

At this time this solution should be considered suitable for research and experimentation, further code and security review is needed before utilization in a production application.

Module is based on the Node.js crypto API. It requires Node v14.18.0 or higher.

Installing

npm install @peculiar/webcrypto

Supported algorithms

Algorithm namegenerateKeydigestexport/importsign/verifyencrypt/decryptwrapKey/unwrapKeyderive
SHA-1X
SHA-256X
SHA-384X
SHA-512X
HMACXXX
RSASSA-PKCS1-v1_5XXX
RSAES-PKCS1-v1_52XXXX
RSA-PSSXXX
RSA-OAEPXXXX
AES-CMACXXX
AES-CBCXXXX
AES-CTRXXXX
AES-ECBXXXX
AES-GCMXXXX
AES-KWXXX
ECDSA1XXX
ECDH1XXX
EdDSA2,3XXX
ECDH-ES2,4XXX
HKDFXX
PBKDF2XX
DES-CBC2XXXX
DES-EDE3-CBC2XXXX
shake1282X
shake2562X

1 Mechanism supports extended list of named curves P-256, P-384, P-521, K-256, brainpoolP160r1, brainpoolP160t1, brainpoolP192r1, brainpoolP192t1, brainpoolP224r1, brainpoolP224t1, brainpoolP256r1, brainpoolP256t1, brainpoolP320r1, brainpoolP320t1, brainpoolP384r1, brainpoolP384t1, brainpoolP512r1, and brainpoolP512t1

2 Mechanism is not defined by the WebCrypto specifications. Use of mechanism in a safe way is hard, it was added for the purpose of enabling interoperability with an existing system. We recommend against its use unless needed for interoperability.

3 Mechanism supports extended list of named curves Ed25519, and Ed448

4 Mechanism supports extended list of named curves X25519, and X448

Using

const { Crypto } = require("@peculiar/webcrypto");

const crypto = new Crypto();

Examples

See WebCrypto Docs for examples

Bug Reporting

Please report bugs either as pull requests or as issues in the issue tracker. @peculiar/webcrypto has a full disclosure vulnerability policy. Please do NOT attempt to report any security vulnerability in this code privately to anybody.

aes
crypto
des
ec
hmac
pbkdf2
rsa
sha
webcrypto

Project health

Overall

3.8/10

Maintained

2/10

Code review

2/10
OpenSSF Scorecard

Significant stargazers

Phil Pluckthun

1,853 followers · starred Oct 2021

Balázs Orbán

1,785 followers · starred Oct 2022

Christoph Werner

121 followers · starred Dec 2024

Johannes Millan

979 followers · starred Mar 2024