#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: Dusan Klinec, ph4r05, 2018

import unittest

from monero_glue.xmr.backend import ed25519


class Basetest(unittest.TestCase):
    """Simple tests"""

    def __init__(self, *args, **kwargs):
        super(Basetest, self).__init__(*args, **kwargs)

    def test_ed25519(self):
        """
        Basic ED25519 invariants
        :return:
        """
        assert ed25519.b >= 10
        assert 8 * len(ed25519.H(b'hash input')) == 2 * ed25519.b
        assert pow(2, ed25519.q - 1, ed25519.q) == 1
        assert ed25519.q % 4 == 1
        assert pow(2, ed25519.l - 1, ed25519.l) == 1
        assert ed25519.l >= 2 ** (ed25519.b - 4)
        assert ed25519.l <= 2 ** (ed25519.b - 3)
        assert pow(ed25519.d, (ed25519.q - 1) // 2, ed25519.q) == ed25519.q - 1
        assert pow(ed25519.I, 2, ed25519.q) == ed25519.q - 1
        assert ed25519.isoncurve(ed25519.B)
        P = ed25519.scalarmult(ed25519.B, ed25519.l)
        assert ed25519.isoncurve(P)

    def test_ed25519_mult8(self):
        """
        Mult8 test vector
        :return:
        """
        p1 = ed25519.decodepoint(bytes(
            [0x14, 0x9c, 0xe9, 0x3f, 0xd3, 0x1d, 0xf5, 0x44, 0x18, 0xa5, 0x29, 0x9b, 0x11, 0xdf, 0xc1, 0x4e, 0x48, 0xd1,
             0x4a, 0x2a, 0x4c, 0xe9, 0x84, 0x0c, 0xf2, 0xff, 0x7c, 0x31, 0x83, 0xda, 0x89, 0x53]))
        p2 = ed25519.decodepoint(bytes(
            [0x25, 0x9e, 0xf2, 0xab, 0xa8, 0xfe, 0xb4, 0x73, 0xcf, 0x39, 0x05, 0x8a, 0x0f, 0xe3, 0x0b, 0x9f, 0xf6, 0xd2,
             0x45, 0xb4, 0x2b, 0x68, 0x26, 0x68, 0x7e, 0xbd, 0x6b, 0x63, 0x12, 0x8a, 0xff, 0x64]))
        self.assertEqual(ed25519.scalarmult(p1, 8), p2)

    def test_ed25519_scalarmult(self):
        """
        Scalar mult test vector
        :return:
        """
        pub = bytes(
            [0x22, 0x4f, 0xad, 0x08, 0x5c, 0x7c, 0x8b, 0xe0, 0xc0, 0x58, 0x48, 0x46, 0xf7, 0x88, 0xd9, 0x48, 0x1e, 0x53,
             0x53, 0xfb, 0xa7, 0xbb, 0xff, 0x4d, 0x24, 0xb0, 0xb8, 0xbc, 0x43, 0xbb, 0x66, 0x6f])
        scal = ed25519.decodeint(bytes(
            [0x4c, 0xe8, 0x8c, 0x16, 0x8e, 0x0f, 0x5f, 0x8d, 0x65, 0x24, 0xf7, 0x12, 0xd5, 0xf8, 0xd7, 0xd8, 0x32, 0x33,
             0xb1, 0xe7, 0xa2, 0xa6, 0x0b, 0x5a, 0xba, 0x52, 0x06, 0xcc, 0x0e, 0xa2, 0xbc, 0x08]))

        res = ed25519.scalarmult(ed25519.decodepointcheck(pub), scal)
        res_h = ed25519.encodepoint(res)

        exp_mul = bytes(
            [0x14, 0x9c, 0xe9, 0x3f, 0xd3, 0x1d, 0xf5, 0x44, 0x18, 0xa5, 0x29, 0x9b, 0x11, 0xdf, 0xc1, 0x4e, 0x48, 0xd1,
             0x4a, 0x2a, 0x4c, 0xe9, 0x84, 0x0c, 0xf2, 0xff, 0x7c, 0x31, 0x83, 0xda, 0x89, 0x53])

        self.assertEqual(res_h, exp_mul)


if __name__ == "__main__":
    unittest.main()  # pragma: no cover


