From 0499541e114e6dd36565428f4f914e0dbdece2b8 Mon Sep 17 00:00:00 2001 From: Leonid Logvinov Date: Tue, 24 Apr 2018 16:36:35 +0200 Subject: Move order utils to @0xproject/order-utils --- packages/order-utils/src/salt.ts | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 packages/order-utils/src/salt.ts (limited to 'packages/order-utils/src/salt.ts') diff --git a/packages/order-utils/src/salt.ts b/packages/order-utils/src/salt.ts new file mode 100644 index 000000000..90a4197c0 --- /dev/null +++ b/packages/order-utils/src/salt.ts @@ -0,0 +1,18 @@ +import { BigNumber } from '@0xproject/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; +} -- cgit v1.2.3