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Deduped random value generation from salt generation

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This commit is contained in:
Greg Hysen
2019-02-08 16:04:45 -08:00
parent 500b4940a3
commit a9aaae7f97
4 changed files with 29 additions and 9 deletions
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10
packages/order-utils/src/salt.ts
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@@ -1,6 +1,4 @@
import { BigNumber } from '@0x/utils';
const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
import { BigNumber, generatePseudoRandom256BitNumber } from '@0x/utils';
/**
* Generates a pseudo-random 256-bit salt.
@@ -9,10 +7,6 @@ const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
* @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).integerValue();
const salt = generatePseudoRandom256BitNumber();
return salt;
}

11
packages/utils/src/address_utils.ts
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@@ -1,7 +1,9 @@
import { addHexPrefix, stripHexPrefix } from 'ethereumjs-util';
import { addHexPrefix, sha3, stripHexPrefix } from 'ethereumjs-util';
import * as jsSHA3 from 'js-sha3';
import * as _ from 'lodash';
import { generatePseudoRandom256BitNumber } from './random';
const BASIC_ADDRESS_REGEX = /^(0x)?[0-9a-f]{40}$/i;
const SAME_CASE_ADDRESS_REGEX = /^(0x)?([0-9a-f]{40}|[0-9A-F]{40})$/;
const ADDRESS_LENGTH = 40;
@@ -43,4 +45,11 @@ export const addressUtils = {
padZeros(address: string): string {
return addHexPrefix(_.padStart(stripHexPrefix(address), ADDRESS_LENGTH, '0'));
},
generatePseudoRandomAddress(): string {
const randomBigNum = generatePseudoRandom256BitNumber();
const randomBuff = sha3(randomBigNum.toString());
const addressLengthInBytes = 20;
const randomAddress = `0x${randomBuff.slice(0, addressLengthInBytes).toString('hex')}`;
return randomAddress;
},
};

1
packages/utils/src/index.ts
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@@ -12,3 +12,4 @@ export { fetchAsync } from './fetch_async';
export { signTypedDataUtils } from './sign_typed_data_utils';
export import AbiEncoder = require('./abi_encoder');
export * from './types';
export { generatePseudoRandom256BitNumber } from './random';

16
packages/utils/src/random.ts Normal file
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@@ -0,0 +1,16 @@
import { BigNumber } from './configured_bignumber';
const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
/**
* Generates a pseudo-random 256-bit number.
* @return A pseudo-random 256-bit number.
*/
export function generatePseudoRandom256BitNumber(): 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 randomNumberScaledTo256Bits = randomNumber.times(factor).integerValue();
return randomNumberScaledTo256Bits;
}