import { BigNumber } from '@0x/utils'; const MAX_DIGITS_IN_UNSIGNED_256_INT = 78; /** * Generates a pseudo-random 256-bit salt. * The salt can be included in a 0x order, ensuring that the order generates a unique orderHash * and will not collide with other outstanding orders that are identical in all other parameters. * @return A pseudo-random 256-bit number that can be used as a salt. */ export function generatePseudoRandomSalt(): BigNumber { // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places. // Source: https://mikemcl.github.io/bignumber.js/#random const randomNumber = BigNumber.random(MAX_DIGITS_IN_UNSIGNED_256_INT); const factor = new BigNumber(10).pow(MAX_DIGITS_IN_UNSIGNED_256_INT - 1); const salt = randomNumber.times(factor).round(); return salt; }