@ellcrys/spell
Version:
The official JavaScript library for Ellcrys
478 lines • 24.5 kB
JavaScript
"use strict";
/**
* @module Key
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var crypto = require("crypto");
var SHA3 = require("sha3").SHA3;
var RIPEMD160 = require("ripemd160");
var b58 = require("bs58check");
var create_hmac_1 = __importDefault(require("create-hmac"));
var tweetnacl_1 = __importDefault(require("tweetnacl"));
var errors_1 = __importDefault(require("./errors"));
exports.AddressVersion = Buffer.from([92]);
exports.PublicKeyVersion = Buffer.from([93]);
exports.PrivateKeyVersion = Buffer.from([94]);
var HARDENED_OFFSET = 0x80000000;
var ED25519_CURVE = "ed25519 seed";
var pathRegex = new RegExp("^m(\\/[0-9]+')+$");
var replaceDerive = function (val) { return val.replace("'", ""); };
/**
* PrivateKey represents an Ed25519
* key use for constructing an Ellcrys
* address, signing and verifying a
* signed messages.
*
* @export
* @class PrivateKey
*/
var PrivateKey = /** @class */ (function () {
/**
* Creates an instance of PrivateKey.
* @param {Buffer} seed 32-byte seed used to create the key
* @memberof PrivateKey
*/
function PrivateKey(seed) {
// If seed is not provided, we go
// on to generate a random seed
if (!seed || seed.length === 0) {
seed = crypto.randomBytes(32);
}
var keypair = tweetnacl_1.default.sign.keyPair.fromSeed(seed);
this.keypair = {
privateKey: Buffer.from(keypair.secretKey),
publicKey: Buffer.from(keypair.publicKey),
};
}
/**
* Instantiate a PrivateKey from a base58
* encoded private key string
*
* @static
* @param {string} str The base58 encoded private keys
* @returns {PrivateKey}
* @throws InvalidPrivateKeyChecksum|InvalidPrivateKeyVersion|InvalidPrivateKeySize
* @memberof PrivateKey
*/
PrivateKey.from = function (str) {
var decoded;
try {
decoded = b58.decode(str);
}
catch (e) {
throw errors_1.default.InvalidPrivateKeyChecksum;
}
if (decoded[0] !== exports.PrivateKeyVersion[0]) {
throw errors_1.default.InvalidPrivateKeyVersion;
}
if (decoded.length !== 65) {
throw errors_1.default.InvalidPrivateKeySize;
}
var pk = decoded.slice(33);
var o = new PrivateKey();
o.keypair.privateKey.set(decoded.slice(1));
o.keypair.publicKey.set(pk);
return o;
};
/**
* Instantiate a PrivateKey from a buffer.
* The buffer's 0th index must contain the
* private key version.
*
* @static
* @param {Buffer} buf
* @returns {PrivateKey}
* @memberof PrivateKey
*/
PrivateKey.fromBuffer = function (buf) {
if (buf[0] !== exports.PrivateKeyVersion[0]) {
throw errors_1.default.InvalidPrivateKeyVersion;
}
if (buf.length !== 65) {
throw errors_1.default.InvalidPrivateKeySize;
}
var pk = buf.slice(33);
var o = new PrivateKey();
o.keypair.privateKey.set(buf.slice(1));
o.keypair.publicKey.set(pk);
return o;
};
/**
* Sign a message
*
* @param {Buffer} data The message
* @returns {Buffer}
* @memberof PrivateKey
*/
PrivateKey.prototype.sign = function (data) {
return Buffer.from(tweetnacl_1.default.sign.detached(data, this.keypair.privateKey));
};
/**
* Returns an address derived from
* the private key
*
* @returns {Address}
* @memberof PrivateKey
*/
PrivateKey.prototype.toAddress = function () {
return this.publicKey().toAddress();
};
/**
* Returns the public key.
*
* @returns {PublicKey}
* @memberof PrivateKey
*/
PrivateKey.prototype.publicKey = function () {
return PublicKey.fromBuffer(Buffer.concat([exports.PublicKeyVersion, this.keypair.publicKey]));
};
/**
* Returns base58 encode string of the private key
*
* @returns {string}
* @memberof PrivateKey
*/
PrivateKey.prototype.toBase58 = function () {
return b58.encode(Buffer.concat([exports.PrivateKeyVersion, this.keypair.privateKey]));
};
/**
* Returns the private key as a buffer.
* The base58 version is added as the 0th
* byte in the returned buffer
*
* @returns {Buffer}
* @memberof PrivateKey
*/
PrivateKey.prototype.toBuffer = function () {
return Buffer.concat([exports.PrivateKeyVersion, this.keypair.privateKey]);
};
return PrivateKey;
}());
exports.PrivateKey = PrivateKey;
/**
* PublicKey represents an ED25519
* public key
*
* @export
* @class PublicKey
*/
// tslint:disable-next-line:max-classes-per-file
var PublicKey = /** @class */ (function () {
function PublicKey() {
}
/**
* Instantiate a PublicKey from a buffer.
* The buffer's 0th index must contain the
* public key version.
*
* @static
* @param {Buffer} buf
* @returns {PublicKey}
* @memberof PublicKey
*/
PublicKey.fromBuffer = function (buf) {
if (buf[0] !== exports.PublicKeyVersion[0]) {
throw errors_1.default.InvalidPublicKeyVersion;
}
if (buf.length !== 33) {
throw errors_1.default.InvalidPublicKeySize;
}
var o = new PublicKey();
o.pk = buf.slice(1);
return o;
};
/**
* Instantiate a PublicKey from a base58
* encoded public key string
*
* @static
* @param {string} str
* @returns {PublicKey}
* @throws InvalidPublicKeyChecksum|InvalidPublicKeyVersion|InvalidPublicKeySize
* @memberof PublicKey
*/
PublicKey.from = function (str) {
var decoded;
try {
decoded = b58.decode(str);
}
catch (e) {
throw errors_1.default.InvalidPublicKeyChecksum;
}
if (decoded[0] !== exports.PublicKeyVersion[0]) {
throw errors_1.default.InvalidPublicKeyVersion;
}
if (decoded.length !== 33) {
throw errors_1.default.InvalidPublicKeySize;
}
var o = new PublicKey();
o.pk = decoded.slice(1);
return o;
};
/**
* Returns base58 encode string of the public key
*
* @returns {string}
* @memberof PublicKey
*/
PublicKey.prototype.toBase58 = function () {
return b58.encode(Buffer.concat([exports.PublicKeyVersion, this.pk]));
};
/**
* Returns the public key as a buffer.
* The public key version is added as the 0th
* byte in the returned buffer
*
* @returns {Buffer}
* @memberof PublicKey
*/
PublicKey.prototype.toBuffer = function () {
return Buffer.concat([exports.PublicKeyVersion, this.pk]);
};
/**
* Returns an address derived from
* the public key
*
* @returns {Address}
* @memberof PublicKey
*/
PublicKey.prototype.toAddress = function () {
var hash = new SHA3(256);
hash.update(this.pk);
var ripHash = new RIPEMD160().update(hash.digest()).digest();
var addr = b58.encode(Buffer.concat([exports.AddressVersion, ripHash]));
return Address.from(addr);
};
/**
* Verify a signature
*
* @param {Buffer} msg The message that was signed
* @param {Buffer} sig The message's signature
* @returns {boolean}
* @memberof PublicKey
*/
PublicKey.prototype.verify = function (msg, sig) {
return tweetnacl_1.default.sign.detached.verify(msg, sig, this.pk);
};
return PublicKey;
}());
exports.PublicKey = PublicKey;
/**
* Address represents a compressed
* equivalent of a public key used
* as an address for transacting.
*
* @class Address
*/
// tslint:disable-next-line:max-classes-per-file
var Address = /** @class */ (function () {
function Address() {
var _this = this;
/**
* Return a string format of the address
*
* @memberof Address
*/
this.toString = function () {
return _this.address;
};
}
/**
* Check whether an address is valid
*
* @static
* @param {string} address The address to check
* @returns {boolean}
* @memberof Address
*/
Address.isValid = function (address) {
try {
var decoded = b58.decode(address);
if (decoded[0] !== exports.AddressVersion[0] || decoded.length !== 21) {
return false;
}
return true;
}
catch (error) {
return false;
}
};
/**
* Check whether a given address is valid.
* If not valid, the specific validation error
* is returned. It returns null if the address
* is valid.
*
* @static
* @param {string} address The address to check
* @returns {(null | Error)} InvalidAddressVersion |
* InvalidAddressSize }| InvalidAddressFormat
* @memberof Address
*/
Address.getValidationError = function (address) {
try {
var decoded = b58.decode(address);
if (decoded[0] !== exports.AddressVersion[0]) {
return errors_1.default.InvalidAddressVersion;
}
if (decoded.length !== 21) {
return errors_1.default.InvalidAddressSize;
}
return null;
}
catch (error) {
return errors_1.default.InvalidAddressFormat;
}
};
/**
* Instantiate an Address instance from
* a given address string
*
* @static
* @param {string} address
* @returns {Address}
* @throws InvalidAddress
* @memberof Address
*/
Address.from = function (address) {
if (!this.isValid(address)) {
throw errors_1.default.InvalidAddress;
}
var addr = new Address();
addr.address = address;
return addr;
};
return Address;
}());
exports.Address = Address;
/**
* Checks whether an HDKey path is
* valid
*
* @export
* @param {string} path The path to check
* @returns {boolean}
*/
function isValidPath(path) {
if (!pathRegex.test(path)) {
return false;
}
return !path
.split("/")
.slice(1)
.map(replaceDerive)
.some(isNaN);
}
exports.isValidPath = isValidPath;
/**
* HDKey provides the ability to create
* hierarchical deterministic keys.
*
* @export
* @class HDKey
*/
// tslint:disable-next-line:max-classes-per-file
var HDKey = /** @class */ (function () {
/**
* Creates an instance of HDKey.
* @param {Buffer} key Left half of the hmac digest
* @param {Buffer} chainCode Right half of the hmac digest
* @memberof HDKey
*/
function HDKey(key, chainCode) {
this.mKey = key;
this.mChainCode = chainCode;
}
/**
* Create an HDKey from a seed.
*
* @static
* @param {Buffer} seed
* @returns {Node}
* @memberof HDKey
*/
HDKey.fromMasterSeed = function (seed) {
var hmac = create_hmac_1.default("sha512", ED25519_CURVE);
var I = hmac.update(seed).digest();
var IL = I.slice(0, 32);
var IR = I.slice(32);
hmac.end();
return new HDKey(IL, IR);
};
/**
* Return the derived key
*
* @returns {Buffer}
* @memberof HDKey
*/
HDKey.prototype.key = function () {
return this.mKey;
};
/**
* Return the derived chain code
*
* @returns {Buffer}
* @memberof HDKey
*/
HDKey.prototype.chainCode = function () {
return this.mChainCode;
};
/**
* Child key derivation function
*
* @param {Buffer} key The parent key
* @param {Buffer} chainCode The parent chain code
* @param {number} index The key index
* @returns {HDKey}
* @memberof HDKey
*/
HDKey.prototype.ckd = function (key, chainCode, index) {
var indexBuffer = Buffer.allocUnsafe(4);
indexBuffer.writeUInt32BE(index, 0);
var data = Buffer.concat([Buffer.alloc(1, 0), key, indexBuffer]);
var I = create_hmac_1.default("sha512", chainCode)
.update(data)
.digest();
var IL = I.slice(0, 32);
var IR = I.slice(32);
return new HDKey(IL, IR);
};
/**
* Given a path, derive a child key. Path
* must contain only hardened indices
*
* @param {string} path The derivation path
* @returns {HDKey}
* @memberof HDKey
*/
HDKey.prototype.derive = function (path) {
var _this = this;
if (!isValidPath(path)) {
throw new Error("Invalid derivation path");
}
var segments = path
.split("/")
.slice(1)
.map(replaceDerive)
.map(function (el) { return parseInt(el, 10); });
return segments.reduce(function (parentKey, segment) {
return _this.ckd(parentKey.mKey, parentKey.mChainCode, segment + HARDENED_OFFSET);
}, this);
};
/**
* Get the private key created using the
* derived key
*
* @returns {PrivateKey}
* @memberof HDKey
*/
HDKey.prototype.privateKey = function () {
return new PrivateKey(this.mKey);
};
return HDKey;
}());
exports.HDKey = HDKey;
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