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author | Greg Hysen <greg.hysen@gmail.com> | 2019-02-09 08:04:45 +0800 |
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committer | Greg Hysen <greg.hysen@gmail.com> | 2019-02-09 09:12:58 +0800 |
commit | a9aaae7f97b2684107d158db0c1530749e096b3e (patch) | |
tree | 83021552be3b885c1d3ea512007edeaae09d136d /packages/utils | |
parent | 500b4940a320c842394c996f15495c1cdc7b3547 (diff) | |
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Deduped random value generation from salt generation
Diffstat (limited to 'packages/utils')
-rw-r--r-- | packages/utils/src/address_utils.ts | 11 | ||||
-rw-r--r-- | packages/utils/src/index.ts | 1 | ||||
-rw-r--r-- | packages/utils/src/random.ts | 16 |
3 files changed, 27 insertions, 1 deletions
diff --git a/packages/utils/src/address_utils.ts b/packages/utils/src/address_utils.ts index 1fc960408..361e35cd8 100644 --- a/packages/utils/src/address_utils.ts +++ b/packages/utils/src/address_utils.ts @@ -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; + }, }; diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts index 467129d2b..f9c2693fe 100644 --- a/packages/utils/src/index.ts +++ b/packages/utils/src/index.ts @@ -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'; diff --git a/packages/utils/src/random.ts b/packages/utils/src/random.ts new file mode 100644 index 000000000..69243bab8 --- /dev/null +++ b/packages/utils/src/random.ts @@ -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; +} |