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-rw-r--r--packages/contracts/util/crypto.ts38
1 files changed, 38 insertions, 0 deletions
diff --git a/packages/contracts/util/crypto.ts b/packages/contracts/util/crypto.ts
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index 000000000..e4baee021
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+++ b/packages/contracts/util/crypto.ts
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+import {BigNumber} from 'bignumber.js';
+import BN = require('bn.js');
+import ABI = require('ethereumjs-abi');
+import ethUtil = require('ethereumjs-util');
+import * as _ from 'lodash';
+
+export const crypto = {
+ /*
+ * We convert types from JS to Solidity as follows:
+ * BigNumber -> uint256
+ * number -> uint8
+ * string -> string
+ * boolean -> bool
+ * valid Ethereum address -> address
+ */
+ solSHA3(args: any[]): Buffer {
+ const argTypes: string[] = [];
+ _.each(args, (arg, i) => {
+ const isNumber = _.isFinite(arg);
+ if (isNumber) {
+ argTypes.push('uint8');
+ } else if ((arg).isBigNumber) {
+ argTypes.push('uint256');
+ args[i] = new BN(arg.toString(10), 10);
+ } else if (ethUtil.isValidAddress(arg)) {
+ argTypes.push('address');
+ } else if (_.isString(arg)) {
+ argTypes.push('string');
+ } else if (_.isBoolean(arg)) {
+ argTypes.push('bool');
+ } else {
+ throw new Error(`Unable to guess arg type: ${arg}`);
+ }
+ });
+ const hash = ABI.soliditySHA3(argTypes, args);
+ return hash;
+ },
+};