def sample_matrix()

in python3/frodokem.py [0:0]

• 6 lines of code
• 7 McCabe index (conditional complexity)

    def sample_matrix(self, r, n1, n2):
        """Sample an n1 x n2 matrix from the error distribution using noise r 
        (FrodoKEM specification, Algorithm 6)"""
        E = [[None for j in range(n2)] for i in range(n1)]
        # 1. for i = 0; i < n1; i += 1
        for i in range(n1):
            # 2. for j = 0; j < n2; j += 1
            for j in range(n2):
                # 3. E[i][j] = Frodo.Sample(r^{i*n2+j}, T_chi)
                E[i][j] = self.sample(r[i * n2 + j])
        return E