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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 {
return crypto._solHash(args, ABI.soliditySHA3);
},
solSHA256(args: any[]): Buffer {
return crypto._solHash(args, ABI.soliditySHA256);
},
_solHash(args: any[], hashFunction: (types: string[], values: any[]) => Buffer): Buffer {
const argTypes: string[] = [];
_.each(args, (arg, i) => {
const isNumber = _.isFinite(arg);
if (isNumber) {
argTypes.push('uint8');
} else if (arg.isBigNumber) {
argTypes.push('uint256');
const base = 10;
args[i] = new BN(arg.toString(base), base);
} else if (ethUtil.isValidAddress(arg)) {
argTypes.push('address');
} else if (_.isString(arg)) {
argTypes.push('string');
} else if (_.isBuffer(arg) || _.isTypedArray(arg)) {
argTypes.push('bytes');
} else if (_.isBoolean(arg)) {
argTypes.push('bool');
} else {
throw new Error(`Unable to guess arg type: ${arg}`);
}
});
const hash = hashFunction(argTypes, args);
return hash;
},
};
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