util.py 文件源码

def crypt_secure_randint(a, b):
    '''
        input: 
        r : the range in which we want the random integer [a,b]
        output:
        a cryptographiically secure random integer in [a,b] 
    '''
    cryptogen = SystemRandom()  #takes entropy from operating system
    return cryptogen.randrange(a, b+1)