Utility Functions

This module contains cryptographic utility functions used by asymmetric ciphers. The functions are implemented in the functions submodule and can be imported directly from the package.

Note

In cryptosystems-0.x, the functions were implemented from scratch in Python. To make the computations faster, cryptosystems-1.x onwards, a C module utilising gmp and a Python wrapper on top of it were implemented, resulting in the increase of speed by several times.

Usage Examples

isPrime

# Example usage of isPrime to check if a number is prime
from cryptosystems import isPrime
print(isPrime(19)) # True
print(isPrime(20)) # False

getPrime

# Example usage of getPrime to get a prime number
from cryptosystems import getPrime
print(getPrime(5)) # 19

getRandomInteger

# Example usage of getRandomInteger to get a random integer
from cryptosystems import getRandomInteger
print(getRandomInteger(5)) # 19

getRandomRange

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

Core Functions

The core mathematical functions implemented in the functions submodule are:

• isPrime
• getPrime
• getRandomInteger
• getRandomRange