util.py 文件源码

def hash_to_baseb(matrix, message, b, k):
    '''
        i/p: 
            matrix : numpy array to be hashed
            message : string that the sender sends  

        o/p: 
            list with k elements each b/w 0 to b-1
    '''
    hexval = hl.sha512(np.array_str(matrix) + message).hexdigest() # returns a string with 128 hex digits
    return np.array(map(int, list(b2b(hexval, 16, b)[:k])))  # returns first k digits from hexval in a list

# this list of symbols allows conversion of numbers represented until base 36