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• .. (вверх)
• [DIR] ..
• [FILE] fromBuffer.ts
• [FILE] index.ts
• [FILE] isProbablyPrime.ts
• [FILE] prime.ts
• [FILE] randBetween.ts
• [FILE] randBits.ts
• [FILE] randBytes.ts
• [FILE] workerUtils.ts

Просмотр файла: randBetween.ts

import { bitLength } from 'bigint-mod-arith'
import { fromBuffer } from './fromBuffer'
import { randBitsSync } from './randBits'

/**
 * Returns a cryptographically secure random integer between [min,max].
 * @param max Returned value will be <= max
 * @param min Returned value will be >= min
 *
 * @throws {RangeError}
 * Arguments MUST be: max > min
 *
 * @returns A cryptographically secure random bigint between [min,max]
 */
export function randBetween (max: bigint, min: bigint = 1n): bigint {
  if (max <= min) throw new RangeError('Arguments MUST be: max > min')
  const interval = max - min
  const bitLen = bitLength(interval)
  let rnd
  do {
    const buf = randBitsSync(bitLen)
    rnd = fromBuffer(buf)
  } while (rnd > interval)
  return rnd + min
}

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