random_test.go

package otr4

import (
	"crypto/rand"

	"github.com/otrv4/ed448"

	. "gopkg.in/check.v1"
)

func (s *OTR4Suite) Test_Randomness(c *C) {
	// randomness
	r := fixedRand([]byte{0x00})
	con := &conversation{random: r}

	c.Assert(con.rand(), DeepEquals, r)

	// no randomness
	con = &conversation{}

	c.Assert(con.rand(), DeepEquals, rand.Reader)
}

func (s *OTR4Suite) Test_RandomBytes(c *C) {
	b, err := randSymKey(fixedRand(randData))

	exp := []byte{
		0x40, 0x80, 0x66, 0x2d, 0xd8, 0xe7, 0xf0, 0x9c,
		0xdf, 0xb0, 0x4e, 0x1c, 0x6e, 0x12, 0x62, 0xa3,
		0x7c, 0x31, 0x9a, 0xe1, 0xe7, 0x86, 0x87, 0xcc,
		0x82, 0x05, 0x78, 0xe6, 0x44, 0x2f, 0x4f, 0x77,
	}

	c.Assert(err, IsNil)
	c.Assert(b, DeepEquals, exp)
}

func (s *OTR4Suite) Test_RandomScalar(c *C) {
	scalar, err := randScalar(fixedRand(randData))

	exp := ed448.NewScalar(
		[]byte{
			0x40, 0x80, 0x66, 0x2d, 0xd8, 0xe7, 0xf0, 0x9c,
			0xdf, 0xb0, 0x4e, 0x1c, 0x6e, 0x12, 0x62, 0xa3,
			0x7c, 0x31, 0x9a, 0xe1, 0xe7, 0x86, 0x87, 0xcc,
			0x82, 0x05, 0x78, 0xe6, 0x44, 0x2f, 0x4f, 0x77,
			0x0e, 0xd1, 0xb4, 0x48, 0xa6, 0x05, 0x90, 0x5e,
			0xe7, 0xba, 0xfc, 0x25, 0x99, 0x99, 0xb8, 0xc3,
			0x90, 0x3e, 0xf4, 0xa3, 0x75, 0xee, 0x85, 0x32,
		},
	)

	c.Assert(err, IsNil)
	c.Assert(scalar, DeepEquals, exp)
}

func (s *OTR4Suite) Test_RandomLongTermScalar(c *C) {
	scalar, err := randLongTermScalar(fixedRand(randData))

	exp := ed448.NewScalar(
		[]byte{
			0xc6, 0xd0, 0x98, 0x2e, 0xe4, 0xe5, 0x81, 0xe4,
			0x61, 0x3c, 0x46, 0x99, 0x0a, 0x37, 0x79, 0xc3,
			0xfa, 0xe5, 0xd5, 0x29, 0x27, 0x31, 0xa3, 0x55,
			0x9f, 0x34, 0x91, 0xd1, 0x0c, 0x7f, 0x88, 0x56,
			0x8c, 0x62, 0xe1, 0x86, 0xb7, 0xef, 0xd6, 0xcb,
			0x1b, 0x14, 0x88, 0x3b, 0xc0, 0xfb, 0xac, 0x46,
			0x0c, 0xc7, 0x20, 0x82, 0x3e, 0xd0, 0xdc, 0x2c,
		},
	)

	c.Assert(err, IsNil)
	c.Assert(scalar, DeepEquals, exp)
}