From 423625bf0517cedcf6e449c354e629386c45e39c Mon Sep 17 00:00:00 2001
From: HashEngineering <hashengineeringsolutions@gmail.com>
Date: Mon, 10 Feb 2020 13:43:05 -0800
Subject: [PATCH] Add Groestlcoin (GRS)

---
 README.md                        |  1 +
 package.json                     |  3 +++
 src/bitcoin_validator.js         |  2 ++
 src/crypto/utils.js              |  5 +++++
 src/currencies.js                |  9 +++++++--
 test/wallet_address_validator.js | 25 +++++++++++++++++++++++++
 6 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index d340cb32..959d4174 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,7 @@ npm install multicoin-address-validator
 * GarliCoin/grlc `'GarliCoin'` or `'grlc'`
 * Gnosis/gno `'Gnosis'` or `'gno'`
 * Golem/gnt `'Golem'` or `'gnt'`
+* Groestlcoin/grs `'Groestlcoin'` or `'grs'`
 * HedgeTrade/hedg `'HedgeTrade'` or `'hedg'`
 * Hush/hush `'Hush'` or `'hush'`
 * HyperSpace/xsc `'HyperSpace'` or `'xsc'`
diff --git a/package.json b/package.json
index 016167d7..03a466f0 100644
--- a/package.json
+++ b/package.json
@@ -86,6 +86,8 @@
         "gno",
         "Golem",
         "gnt",
+        "Groestlcoin"",
+        "grs",
         "HedgeTrade",
         "hedg",
         "Hush",
@@ -243,6 +245,7 @@
         "bundle": "^2.1.0",
         "cbor-js": "^0.1.0",
         "crc": "^3.8.0",
+        "groestl-hash-js": "1.0.0",
         "jssha": "^3.1.2",
         "lodash.isequal": "^4.5.0",
         "minify": "^6.0.0"
diff --git a/src/bitcoin_validator.js b/src/bitcoin_validator.js
index 4b22ecfe..1e8fa530 100644
--- a/src/bitcoin_validator.js
+++ b/src/bitcoin_validator.js
@@ -24,6 +24,8 @@ function getChecksum(hashFunction, payload) {
             return cryptoUtils.blake256Checksum(payload);
         case 'keccak256':
             return cryptoUtils.keccak256Checksum(payload);
+        case 'groestl512x2':
+            return cryptoUtils.groestl512x2(payload);
         case 'sha256':
         default:
             return cryptoUtils.sha256Checksum(payload);
diff --git a/src/crypto/utils.js b/src/crypto/utils.js
index c12318f7..671cc5ba 100644
--- a/src/crypto/utils.js
+++ b/src/crypto/utils.js
@@ -5,6 +5,7 @@ var Blake2B = require('./blake2b');
 var base58 = require('./base58');
 var base32 = require('./base32');
 var BigNum = require('browserify-bignum');
+var groestl = require('groestl-hash-js');
 
 function numberToHex(number) {
     var hex = Math.round(number).toString(16)
@@ -115,6 +116,10 @@ module.exports = {
     blake2b256: function (hexString) {
         return new Blake2B(32).update(Buffer.from(hexString, 'hex'), 32).digest('hex');
     },
+    groestl512x2: function (hexString) {
+        let result = groestl.groestl_2(Buffer.from(hexString, 'hex'), 1, 0).substr(0, 8);
+        return result;
+    },
     base58: base58.decode,
     byteArray2hexStr: byteArray2hexStr,
     hexStr2byteArray: hexStr2byteArray,
diff --git a/src/currencies.js b/src/currencies.js
index 1b7aad4e..b43b14e8 100644
--- a/src/currencies.js
+++ b/src/currencies.js
@@ -39,6 +39,13 @@ var CURRENCIES = [{
         addressTypes: { prod: ['30', '05', '32'], testnet: ['6f', 'c4', '3a'] },
         bech32Hrp: { prod: ['ltc'], testnet: ['tltc'] },
         validator: BTCValidator
+    }, {
+        name: 'Groestlcoin',
+        symbol: 'grs',
+        addressTypes: { prod: ['24', '05'], testnet: ['6f', 'c4'] },
+        bech32Hrp: { prod: ['grs'], testnet: ['tgrs'] },
+        hashFunction: 'groestl512x2',
+        validator: BTCValidator
     }, {
         name: 'PeerCoin',
         symbol: 'ppc',
@@ -516,5 +523,3 @@ var CURRENCIES = [{
 // CURRENCIES
 //     .sort((a, b) => a.name.toUpperCase() > b.name.toUpperCase() ? 1 : -1)
 //     .forEach(c => console.log(`"${c.name}","${c.symbol}",`));
-
-
diff --git a/test/wallet_address_validator.js b/test/wallet_address_validator.js
index f7faf98e..489693c9 100644
--- a/test/wallet_address_validator.js
+++ b/test/wallet_address_validator.js
@@ -103,6 +103,31 @@ describe('WAValidator.validate()', function () {
             valid('tltc1qu78xur5xnq6fjy83amy0qcjfau8m367defyhms', 'litecoin', { networkType: 'testnet' });
         });
 
+        it('should return true for correct groestlcoin addresses', function () {
+            valid('Foa6yZoKq2r4t3tUFKFcfoXSQjSodZsGx1', 'groestlcoin');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'groestlcoin');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'GRS');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'Groestlcoin');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'grs');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'grs', 'prod');
+            valid('Fr2Z1bLzqRZByt2WeZwWnpCkA1eBYv83wZ', 'grs', 'both');
+            valid('FpM19fiGQNjNcaRjFaXVX6Nrewr4gnuuMZ', 'grs', 'prod');
+            valid('3FyVFsEyyBPzHjD3qUEgX7Jsn4tcJWiqeN', 'grs', 'prod');
+            valid('38mKdURe1zcQyrFqRLzR8PRao3iLFU5hwU', 'grs', 'prod');
+            valid('mptPo5AvLzJXi4T82vR6g82fT5uJ9cgfsV', 'grs', 'both');
+            valid('FdWcvgskHoXUTqeQRAiuGuh5KQ2EoXv5iM', 'groestlcoin');
+            valid('mzBc4XEFSdzCDcTxAgf6EZXgsZWq3SbMQT', 'groestlcoin', 'testnet');
+            valid('mzBc4XEFSdzCDcTxAgf6EZXgsZWq3SbMQT', 'groestlcoin', 'both');
+
+            // p2sh addresses
+            valid('3NJZLcZEEYBpxYEUGewU4knsQRn1T2Htk2', 'groestlcoin');
+            valid('2MxKEf2su6FGAUfCEAHreGFQvEYrfZDahUf', 'groestlcoin', 'testnet');
+
+            // segwit addresses
+            valid('grs1q49qls5kklryt95g5xx4p6msycpgjp8ramfc9jq', 'groestlcoin');
+            valid('tgrs1qgjd3qhncsxdyh5gt7hz4k6zzvfguslwxwgv23j', 'groestlcoin');
+        });
+
         it('should return true for correct peercoin addresses', function () {
             valid('PHCEsP6od3WJ8K2WKWEDBYKhH95pc9kiZN', 'peercoin');
             valid('PSbM1pGoE9dnAuVWvpQqTTYVpKZU41dNAz', 'peercoin');