dirkmc 0b686d363c chore: add error codes (#155)
* chore: add error codes

* chore: create errors with new Error()

* fix: better error testin

* refactor: simplify random bytes error checks
2019-07-22 11:16:02 +01:00

121 lines
4.1 KiB
JavaScript

'use strict'
const protobuf = require('protons')
const keysPBM = protobuf(require('./keys.proto'))
require('node-forge/lib/asn1')
require('node-forge/lib/rsa')
require('node-forge/lib/pbe')
const forge = require('node-forge/lib/forge')
const errcode = require('err-code')
exports = module.exports
const supportedKeys = {
rsa: require('./rsa-class'),
ed25519: require('./ed25519-class'),
secp256k1: require('libp2p-crypto-secp256k1')(keysPBM, require('../random-bytes'))
}
exports.supportedKeys = supportedKeys
exports.keysPBM = keysPBM
const ErrMissingSecp256K1 = {
message: 'secp256k1 support requires libp2p-crypto-secp256k1 package',
code: 'ERR_MISSING_PACKAGE'
}
function typeToKey (type) {
let key = supportedKeys[type.toLowerCase()]
if (!key) {
const supported = Object.keys(supportedKeys).join(' / ')
throw errcode(new Error(`invalid or unsupported key type ${type}. Must be ${supported}`), 'ERR_UNSUPPORTED_KEY_TYPE')
}
return key
}
exports.keyStretcher = require('./key-stretcher')
exports.generateEphemeralKeyPair = require('./ephemeral-keys')
// Generates a keypair of the given type and bitsize
exports.generateKeyPair = async (type, bits) => { // eslint-disable-line require-await
return typeToKey(type).generateKeyPair(bits)
}
// Generates a keypair of the given type and bitsize
// seed is a 32 byte uint8array
exports.generateKeyPairFromSeed = async (type, seed, bits) => { // eslint-disable-line require-await
const key = typeToKey(type)
if (type.toLowerCase() !== 'ed25519') {
throw errcode(new Error('Seed key derivation is unimplemented for RSA or secp256k1'), 'ERR_UNSUPPORTED_KEY_DERIVATION_TYPE')
}
return key.generateKeyPairFromSeed(seed, bits)
}
// Converts a protobuf serialized public key into its
// representative object
exports.unmarshalPublicKey = (buf) => {
const decoded = keysPBM.PublicKey.decode(buf)
const data = decoded.Data
switch (decoded.Type) {
case keysPBM.KeyType.RSA:
return supportedKeys.rsa.unmarshalRsaPublicKey(data)
case keysPBM.KeyType.Ed25519:
return supportedKeys.ed25519.unmarshalEd25519PublicKey(data)
case keysPBM.KeyType.Secp256k1:
if (supportedKeys.secp256k1) {
return supportedKeys.secp256k1.unmarshalSecp256k1PublicKey(data)
} else {
throw errcode(new Error(ErrMissingSecp256K1.message), ErrMissingSecp256K1.code)
}
default:
typeToKey(decoded.Type) // throws because type is not supported
}
}
// Converts a public key object into a protobuf serialized public key
exports.marshalPublicKey = (key, type) => {
type = (type || 'rsa').toLowerCase()
typeToKey(type) // check type
return key.bytes
}
// Converts a protobuf serialized private key into its
// representative object
exports.unmarshalPrivateKey = async (buf) => { // eslint-disable-line require-await
const decoded = keysPBM.PrivateKey.decode(buf)
const data = decoded.Data
switch (decoded.Type) {
case keysPBM.KeyType.RSA:
return supportedKeys.rsa.unmarshalRsaPrivateKey(data)
case keysPBM.KeyType.Ed25519:
return supportedKeys.ed25519.unmarshalEd25519PrivateKey(data)
case keysPBM.KeyType.Secp256k1:
if (supportedKeys.secp256k1) {
return supportedKeys.secp256k1.unmarshalSecp256k1PrivateKey(data)
} else {
throw errcode(new Error(ErrMissingSecp256K1.message), ErrMissingSecp256K1.code)
}
default:
typeToKey(decoded.Type) // throws because type is not supported
}
}
// Converts a private key object into a protobuf serialized private key
exports.marshalPrivateKey = (key, type) => {
type = (type || 'rsa').toLowerCase()
typeToKey(type) // check type
return key.bytes
}
exports.import = async (pem, password) => { // eslint-disable-line require-await
const key = forge.pki.decryptRsaPrivateKey(pem, password)
if (key === null) {
throw errcode(new Error('Cannot read the key, most likely the password is wrong or not a RSA key'), 'ERR_CANNOT_DECRYPT_PEM')
}
let der = forge.asn1.toDer(forge.pki.privateKeyToAsn1(key))
der = Buffer.from(der.getBytes(), 'binary')
return supportedKeys.rsa.unmarshalRsaPrivateKey(der)
}