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* Flow JS Testing
*
* Copyright 2020-2021 Dapper Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as rlp from "rlp"
import {config, account} from "@onflow/fcl"
import {ec as EC} from "elliptic"
import {getServiceAddress, isObject, isString} from "./utils"
import {invariant} from "./invariant"
import {sha3_256} from "js-sha3"
import {sha256 as sha2_256} from "js-sha256"
/**
* Represents a signature for an arbitrary message generated using a particular key
* @typedef {Object} SignatureObject
* @property {string} addr address of account whose key was used to sign the message
* @property {number} keyId key index on the account of they key used to sign the message
* @property {string} signature signature corresponding to the signed message hash as hex-encoded string
*/
/**
* Represents a private key object which may be used to generate a public key
* @typedef {Object} KeyObject
* @property {string | Buffer} privateKey private key for this key object
* @property {SignatureAlgorithm} [signatureAlgorithm=SignatureAlgorithm.ECDSA_P256] signing algorithm used with this key
* @property {HashAlgorithm} [hashAlgorithm=HashAlgorithm.SHA3_256] hash algorithm used with this key
* @property {weight} [weight=1000] desired weight of this key (default full weight)
*/
/**
* Represents a signer of a message or transaction
* @typedef {Object} SignerInfoObject
* @property {string} addr address of the signer
* @property {HashAlgorithm} [hashAlgorithm=HashAlgorithm.SHA3_256] hash algorithm used to hash the message before signing
* @property {SignatureAlgorithm} [signatureAlgorithm=SignatureAlgorithm.ECDSA_P256] signing algorithm used to generate the signature
* @property {number} [keyId=0] index of the key on the signers account to use
* @property {string | Buffer} [privateKey=SERVICE_KEY] private key of the signer (defaults to universal private key/service key from config)
*/
/**
* Enum for signing algorithms
* @readonly
* @enum {number}
*/
export const SignatureAlgorithm = {
ECDSA_P256: 1,
ECDSA_secp256k1: 2,
}
/**
* Enum for hasing algorithms
* @readonly
* @enum {number}
*/
export const HashAlgorithm = {
SHA2_256: 1,
SHA3_256: 3,
}
/**
* Enum for mapping hash algorithm name to hashing function
* @readonly
* @enum {function}
*/
export const HashFunction = {
SHA2_256: sha2_256,
SHA3_256: sha3_256,
}
/**
* Enum for mapping signature algorithm to elliptic instance
* @readonly
* @enum {EC}
*/
export const ec = {
ECDSA_P256: new EC("p256"),
ECDSA_secp256k1: new EC("secp256k1"),
}
export const resolveHashAlgoKey = hashAlgorithm => {
const hashAlgorithmKey = Object.keys(HashAlgorithm).find(
x =>
HashAlgorithm[x] === hashAlgorithm ||
(isString(hashAlgorithm) &&
x.toLowerCase() === hashAlgorithm.toLowerCase())
)
if (!hashAlgorithmKey)
throw new Error(
`Provided hash algorithm "${hashAlgorithm}" is not currently supported`
)
return hashAlgorithmKey
}
export const resolveSignAlgoKey = signatureAlgorithm => {
const signatureAlgorithmKey = Object.keys(SignatureAlgorithm).find(
x =>
SignatureAlgorithm[x] === signatureAlgorithm ||
(isString(signatureAlgorithm) &&
x.toLowerCase() === signatureAlgorithm.toLowerCase())
)
if (!signatureAlgorithmKey)
throw new Error(
`Provided signature algorithm "${signatureAlgorithm}" is not currently supported`
)
return signatureAlgorithmKey
}
const hashMsgHex = (msgHex, hashAlgorithm = HashAlgorithm.SHA3_256) => {
const hashAlgorithmKey = resolveHashAlgoKey(hashAlgorithm)
const hashFn = HashFunction[hashAlgorithmKey]
const hash = hashFn.create()
hash.update(Buffer.from(msgHex, "hex"))
return Buffer.from(hash.arrayBuffer())
}
export const signWithKey = (
privateKey,
msgHex,
hashAlgorithm = HashAlgorithm.SHA3_256,
signatureAlgorithm = SignatureAlgorithm.ECDSA_P256
) => {
const signAlgo = resolveSignAlgoKey(signatureAlgorithm)
const key = ec[signAlgo].keyFromPrivate(Buffer.from(privateKey, "hex"))
const sig = key.sign(hashMsgHex(msgHex, hashAlgorithm))
const n = 32 // half of signature length?
const r = sig.r.toArrayLike(Buffer, "be", n)
const s = sig.s.toArrayLike(Buffer, "be", n)
return Buffer.concat([r, s]).toString("hex")
}
export const resolveSignerKey = async signer => {
let addr = await getServiceAddress(),
keyId = 0,
privateKey = await config().get("PRIVATE_KEY"),
hashAlgorithm = HashAlgorithm.SHA3_256,
signatureAlgorithm = SignatureAlgorithm.ECDSA_P256
if (isObject(signer)) {
;({
addr = addr,
keyId = keyId,
privateKey = privateKey,
hashAlgorithm = hashAlgorithm,
signatureAlgorithm = signatureAlgorithm,
} = signer)
} else {
addr = signer || addr
}
return {
addr,
keyId,
privateKey,
hashAlgorithm,
signatureAlgorithm,
}
}
export const authorization =
signer =>
async (account = {}) => {
const {addr, keyId, privateKey, hashAlgorithm, signatureAlgorithm} =
await resolveSignerKey(signer)
const signingFunction = async data => ({
keyId,
addr: addr,
signature: signWithKey(
privateKey,
data.message,
hashAlgorithm,
signatureAlgorithm
),
})
return {
...account,
addr,
keyId,
signingFunction,
}
}
/**
* Returns an RLP-encoded public key for a particular private key as a hex-encoded string
* @param {KeyObject} keyObject
* @param {string | Buffer} keyObject.privateKey private key as hex-encoded string or Buffer
* @param {HashAlgorithm | string} [keyObject.hashAlgorithm=HashAlgorithm.SHA3_256] hasing algorithnm used to hash messages using this key
* @param {SignatureAlgorithm | string} [keyObject.signatureAlgorithm=SignatureAlgorithm.ECDSA_P256] signing algorithm used to generate signatures using this key
* @param {number} [keyObject.weight=1000] weight of the key
* @returns {string}
*/
export const pubFlowKey = async (keyObject = {}) => {
let {
privateKey = await config().get("PRIVATE_KEY"),
hashAlgorithm = HashAlgorithm.SHA3_256,
signatureAlgorithm = SignatureAlgorithm.ECDSA_P256,
weight = 1000, // give key full weight
} = keyObject
// Convert hex string private key to buffer if not buffer already
if (!Buffer.isBuffer(privateKey)) privateKey = Buffer.from(privateKey, "hex")
const hashAlgoName = resolveHashAlgoKey(hashAlgorithm)
const sigAlgoName = resolveSignAlgoKey(signatureAlgorithm)
const keys = ec[sigAlgoName].keyFromPrivate(privateKey)
const publicKey = keys.getPublic("hex").replace(/^04/, "")
return rlp
.encode([
Buffer.from(publicKey, "hex"), // publicKey hex to binary
SignatureAlgorithm[sigAlgoName],
HashAlgorithm[hashAlgoName],
weight,
])
.toString("hex")
}
export const prependDomainTag = (msgHex, domainTag) => {
const rightPaddedBuffer = buffer =>
Buffer.concat([Buffer.alloc(32 - buffer.length, 0), buffer])
let domainTagBuffer = rightPaddedBuffer(Buffer.from(domainTag, "utf-8"))
return domainTagBuffer.toString("hex") + msgHex
}
/**
* Signs a user message for a given signer
* @param {string | Buffer} msgHex hex-encoded string or Buffer of the message to sign
* @param {string | SignerInfoObject} signer signer address provided as string and JS Testing signs with universal private key/service key or signer info provided manually via SignerInfoObject
* @param {string} domainTag utf-8 domain tag to use when hashing message
* @returns {SignatureObject} signature object which can be validated using verifyUserSignatures
*/
export const signUserMessage = async (msgHex, signer, domainTag) => {
if (Buffer.isBuffer(msgHex)) msgHex.toString("hex")
const {addr, keyId, privateKey, hashAlgorithm, signatureAlgorithm} =
await resolveSignerKey(signer, true)
if (domainTag) {
msgHex = prependDomainTag(msgHex, domainTag)
}
return {
keyId,
addr: addr,
signature: signWithKey(
privateKey,
msgHex,
hashAlgorithm,
signatureAlgorithm
),
}
}
/**
* Verifies whether user signatures were valid for a particular message hex
* @param {string | Buffer} msgHex hex-encoded string or buffer of message to verify
* @param {[SignatureObject]} signatures array of signatures to verify against msgHex
* @param {string} [domainTag=""] utf-8 domain tag to use when hashing message
* @returns {boolean} true if signatures are valid and total weight >= 1000
*/
export const verifyUserSignatures = async (
msgHex,
signatures,
domainTag = ""
) => {
if (Buffer.isBuffer(msgHex)) msgHex = msgHex.toString("hex")
invariant(signatures, "One or mores signatures must be provided")
// convert to array
signatures = [].concat(signatures)
invariant(signatures.length > 0, "One or mores signatures must be provided")
invariant(
signatures.reduce(
(valid, sig) =>
valid && sig.signature != null && sig.keyId != null && sig.addr != null,
true
),
"One or more signature is invalid. Valid signatures have the following keys: addr, keyId, siganture"
)
const address = signatures[0].addr
invariant(
signatures.reduce((same, sig) => same && sig.addr === address, true),
"Signatures must belong to the same address"
)
const keys = (await account(address)).keys
const largestKeyId = Math.max(...signatures.map(sig => sig.keyId))
invariant(
largestKeyId < keys.length,
`Key index ${largestKeyId} does not exist on account ${address}`
)
// Apply domain tag if needed
if (domainTag) {
msgHex = prependDomainTag(msgHex, domainTag)
}
let totalWeight = 0
for (let i in signatures) {
const {signature, keyId} = signatures[i]
const {
hashAlgoString: hashAlgo,
signAlgoString: signAlgo,
weight,
publicKey,
revoked,
} = keys[keyId]
const key = ec[signAlgo].keyFromPublic(Buffer.from("04" + publicKey, "hex"))
Iif (revoked) return false
const msgHash = hashMsgHex(msgHex, hashAlgo)
const sigBuffer = Buffer.from(signature, "hex")
const signatureInput = {
r: sigBuffer.slice(0, 32),
s: sigBuffer.slice(-32),
}
if (!key.verify(msgHash, signatureInput)) return false
totalWeight += weight
}
return totalWeight >= 1000
}
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