libp2p-crypto

js-libp2p-crypto

[](https://saucelabs.com/u/ipfs-js- libp2p-crypto)

Crypto primitives for libp2p in JavaScript

This repo contains the JavaScript implementation of the crypto primitives needed for libp2p. This is based on this go implementation.

Table of Contents

• Install
• Usage
  • Example
• API
  • hmac
    • create(hash, secret, callback)
      • digest(data, callback)
  • aes
    • create(key, iv, callback)
      • encrypt(data, callback)
      • encrypt(data, callback)
  • webcrypto
  • keys
  • generateKeyPair(type, bits, callback)
  • generateEphemeralKeyPair(curve, callback)
  • keyStretcher(cipherType, hashType, secret, callback)
  • marshalPublicKey(key[, type], callback)
  • unmarshalPublicKey(buf)
  • marshalPrivateKey(key[, type])
  • unmarshalPrivateKey(buf, callback)
• Contribute
• License

Install

npm install --save libp2p-crypto

Usage

Example

const crypto = require('libp2p-crypto')

crypto.generateKeyPair('RSA', 2048, (err, key) => {
})

API

hmac

Exposes an interface to the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198. An HMAC is a cryptographic hash that uses a key to sign a message. The receiver verifies the hash by recomputing it using the same key.

create(hash, secret, callback)

• hash: String
• secret: Buffer
• callback: Function

digest(data, callback)

• data: Buffer
• callback: Function

aes

Expoes an interface to AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.

This uses CTR mode.

create(key, iv, callback)

• key: Buffer The key, if length 16 then AES 128 is used. For length 32, AES 256 is used.
• iv: Buffer Must have length 16.
• callback: Function

encrypt(data, callback)

• data: Buffer
• callback: Function

encrypt(data, callback)

• data: Buffer
• callback: Function

webcrypto

Depending on the environment this is either an instance of node-webcrypto-ossl or the result of window.crypto.

keys

generateKeyPair(type, bits, callback)

• type: String, only 'RSA' is currently supported
• bits: Number Minimum of 1024
• callback: Function

Generates a keypair of the given type and bitsize.

generateEphemeralKeyPair(curve, callback)

• curve: String, one of 'P-256', 'P-384', 'P-521' is currently supported
• callback: Function

Generates an ephemeral public key and returns a function that will compute the shared secret key.

Focuses only on ECDH now, but can be made more general in the future.

Calls back with an object of the form

{
  key: Buffer,
  genSharedKey: Function
}

keyStretcher(cipherType, hashType, secret, callback)

• cipherType: String, one of 'AES-128', 'AES-256', 'Blowfish'
• hashType: String, one of 'SHA1', SHA256, SHA512
• secret: Buffer
• callback: Function

Generates a set of keys for each party by stretching the shared key.

Calls back with an object of the form

{
  k1: {
    iv: Buffer,
    cipherKey: Buffer,
    macKey: Buffer
  },
  k2: {
    iv: Buffer,
    cipherKey: Buffer,
    macKey: Buffer
  }
}

marshalPublicKey(key[, type], callback)

• key: crypto.rsa.RsaPublicKey
• type: String, only 'RSA' is currently supported

Converts a public key object into a protobuf serialized public key.

unmarshalPublicKey(buf)

• buf: Buffer

Converts a protobuf serialized public key into its representative object.

marshalPrivateKey(key[, type])

• key: crypto.rsa.RsaPrivateKey
• type: String, only 'RSA' is currently supported

Converts a private key object into a protobuf serialized private key.

unmarshalPrivateKey(buf, callback)

• buf: Buffer
• callback: Function

Converts a protobuf serialized private key into its representative object.

randomBytes(number)

• number: Number

Generates a Buffer with length number populated by random bytes.

Contribute

Feel free to join in. All welcome. Open an issue!

This repository falls under the IPFS Code of Conduct.

License

MIT