getRandomRange

Generate a random integer in the range [a, b).

Introduction

The getRandomRange function generates a random integer in the range [a, b). The function can generate a random integer in the range [a, b) for any values of a and b if the force parameter is set to True. However, for performance reasons, the function is limited to generating a random integer in the range [a, b) for values of a and b <= 2^18 if force=False.

getRandomRange(a, b, force=False)

Parameters:

• a (int) – The lower bound of the range, should be a positive integer. a is asserted to be <= 2^18 for performance reasons.

• b (int) – The upper bound of the range, should be a positive integer. b is asserted to be <= 2^18 for performance reasons.

• force (bool) – If True, the function will generate a random integer in the range [a, b) for any values of a and b, defaults to False for performance reasons.

Returns:

A random integer of N bits

Return type:

int

Example Usage

# Example usage of getRandomRange to generate a random integer in the range [5, 25)
from cryptosystems import getRandomRange
getRandomRange(5, 25) # 19