v/vlib/crypto/ed25519/internal/edwards25519/scalar_test.v

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module edwards25519
import os
import rand
import encoding.hex
import math.big
const github_job = os.getenv('GITHUB_JOB')
fn testsuite_begin() {
if edwards25519.github_job != '' {
// ensure that the CI does not run flaky tests:
rand.seed([u32(0xffff24), 0xabcd])
}
}
fn test_scalar_equal() {
assert sc_one.equal(sc_minus_one) != 1
assert sc_minus_one.equal(sc_minus_one) != 0
}
fn test_scalar_non_adjacent_form() {
mut s := Scalar{
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s: [u8(0x1a), 0x0e, 0x97, 0x8a, 0x90, 0xf6, 0x62, 0x2d, 0x37, 0x47, 0x02, 0x3f, 0x8a,
0xd8, 0x26, 0x4d, 0xa7, 0x58, 0xaa, 0x1b, 0x88, 0xe0, 0x40, 0xd1, 0x58, 0x9e, 0x7b,
0x7f, 0x23, 0x76, 0xef, 0x09]!
}
expected_naf := [i8(0), 13, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, -11,
0, 0, 0, 0, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 9, 0, 0, 0, 0, -5, 0, 0, 0, 0, 0, 0, 3, 0, 0,
0, 0, 11, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 9, 0, 0, 0,
0, 0, 1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, -15, 0, 0, 0, 0, -7, 0, 0,
0, 0, -9, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, -11, 0, 0, 0,
0, -7, 0, 0, 0, 0, -13, 0, 0, 0, 0, 11, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
-15, 0, 0, 0, 0, 1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 13, 0, 0,
0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0,
0, 0, 0, 0, 7, 0, 0, 0, 0, 0, -15, 0, 0, 0, 0, 0, 15, 0, 0, 0, 0, 15, 0, 0, 0, 0, 15, 0,
0, 0, 0, 0, 1, 0, 0, 0, 0]
snaf := s.non_adjacent_form(5)
for i := 0; i < 256; i++ {
assert expected_naf[i] == snaf[i]
}
}
fn addlike_subneg(x Scalar, y Scalar) bool {
// Compute t1 = x - y
mut t1 := Scalar{}
t1.subtract(x, y)
// Compute t2 = -y + x
mut t2 := Scalar{}
t2.negate(y)
t2.add(t2, x)
return t1 == t2 && is_reduced(t1)
}
fn test_scalar_add_like_subneg() {
for i in 0 .. 15 {
x := generate_scalar(1000) or { panic(err) }
y := generate_scalar(1000) or { panic(err) }
assert addlike_subneg(x, y) == true
}
}
fn fg(sc Scalar) bool {
return is_reduced(sc)
}
fn test_scalar_generate() ? {
for i in 0 .. 15 {
sc := generate_scalar(1000) or { panic(err) }
assert fg(sc) == true
}
}
//
fn test_scalar_set_canonical_bytes() ? {
for i in 0 .. 10 {
mut buf := rand.bytes(32) or { panic(err) }
mut sc := generate_scalar(1000) or { panic(err) }
buf[buf.len - 1] &= (1 << 4) - 1
sc = sc.set_canonical_bytes(buf) or { panic(err) }
assert buf[..] == sc.bytes()
assert is_reduced(sc)
}
}
fn test_scalar_set_canonical_bytes_round_trip() ? {
for i in 0 .. 10 {
mut sc1 := generate_scalar(2) ?
mut sc2 := generate_scalar(6) ?
sc2.set_canonical_bytes(sc1.bytes()) or { panic(err) }
assert sc1 == sc2
}
}
const (
sc_error = Scalar{
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s: [32]byte{init: (u8(-1))}
}
)
fn test_scalar_set_canonical_bytes_on_noncanonical_value() ? {
mut b := sc_minus_one.s
b[31] += 1
mut s := sc_one
out := s.set_canonical_bytes(b[..]) or { edwards25519.sc_error } // set_canonical_bytes shouldn't worked on a non-canonical value"
assert out == edwards25519.sc_error
assert s == sc_one
}
fn test_scalar_set_uniform_bytes() ? {
// mod, _ := new(big.Integer).SetString("27742317777372353535851937790883648493", 10)
mut mod := big.integer_from_string('27742317777372353535851937790883648493') ?
// mod.Add(mod, new(big.Integer).Lsh(big.NewInt(1), 252))
mod = mod + big.integer_from_i64(1).lshift(252)
mut sc := generate_scalar(100) ?
inp := rand.bytes(64) ?
sc.set_uniform_bytes(inp[..]) ?
assert is_reduced(sc) == true
scbig := bigint_from_le_bytes(sc.s[..])
inbig := bigint_from_le_bytes(inp)
// return inbig.Mod(inbig, mod).Cmp(scbig) == 0
_, m := inbig.div_mod(mod)
assert m.abs_cmp(scbig) == 0 // NEED FIX
}
fn bigint_from_le_bytes(b []byte) big.Integer {
mut bc := b.clone()
buf := swap_endianness(mut bc) // WITHOUT THIS, some test would fail
bg := big.integer_from_bytes(buf)
return bg
}
fn test_scalar_set_bytes_with_clamping() {
// Generated with libsodium.js 1.0.18 crypto_scalarmult_ed25519_base.
/*
random := "633d368491364dc9cd4c1bf891b1d59460face1644813240a313e61f2c88216e"
s, _ := new(Scalar).SetBytesWithClamping(decodeHex(random))
p := new(Point).ScalarBaseMult(s)
want := "1d87a9026fd0126a5736fe1628c95dd419172b5b618457e041c9c861b2494a94"
if got := hex.EncodeToString(p.Bytes()); got != want {
t.Errorf("random: got %q, want %q", got, want)
}*/
random := '633d368491364dc9cd4c1bf891b1d59460face1644813240a313e61f2c88216e'
random_bytes := hex.decode(random) or { panic(err) }
mut s0 := Scalar{}
s0.set_bytes_with_clamping(random_bytes) or { panic(err) }
mut p0 := Point{}
p0.scalar_base_mult(mut s0)
want0 := '1d87a9026fd0126a5736fe1628c95dd419172b5b618457e041c9c861b2494a94'
got0 := hex.encode(p0.bytes())
assert got0 == want0
zero := '0000000000000000000000000000000000000000000000000000000000000000'
mut s1 := Scalar{}
zero_bytes := hex.decode(zero) or { panic(err) }
s1.set_bytes_with_clamping(zero_bytes) or { panic(err) }
mut p1 := Point{}
p1.scalar_base_mult(mut s1)
want1 := '693e47972caf527c7883ad1b39822f026f47db2ab0e1919955b8993aa04411d1'
got1 := hex.encode(p1.bytes())
assert want1 == got1
one := 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
mut s2 := Scalar{}
mut one_bytes := hex.decode(one) or { panic(err) }
s2.set_bytes_with_clamping(one_bytes) or { panic(err) }
mut p2 := Point{}
p2.scalar_base_mult(mut s2)
want2 := '12e9a68b73fd5aacdbcaf3e88c46fea6ebedb1aa84eed1842f07f8edab65e3a7'
got2 := hex.encode(p2.bytes())
assert want2 == got2
}
fn test_scalar_multiply_distributes_over_add() ? {
x := generate_scalar(100) ?
y := generate_scalar(100) ?
z := generate_scalar(100) ?
// Compute t1 = (x+y)*z
mut t1 := Scalar{}
t1.add(x, y)
t1.multiply(t1, z)
// Compute t2 = x*z + y*z
mut t2 := Scalar{}
mut t3 := Scalar{}
t2.multiply(x, z)
t3.multiply(y, z)
t2.add(t2, t3)
assert t1 == t2 && is_reduced(t1) && is_reduced(t3)
}