1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// Copyright 2019 ProtonTech AG.
// Package ecc implements a generic interface for ECDH, ECDSA, and EdDSA.
package ecc
import (
"crypto/rand"
"testing"
)
// Some OpenPGP implementations, such as gpg 2.2.12, do not accept ECDH private
// keys if they're not masked. This is because they're not of the proper form,
// cryptographically, and they don't mask input keys during crypto operations.
// This test checks if the keys that this library stores or outputs are
// properly masked.
func TestGenerateMaskedPrivateKeyX25519(t *testing.T) {
c := NewCurve25519()
_, secret, err := c.GenerateECDH(rand.Reader)
if err != nil {
t.Fatal(err)
}
encoded := c.MarshalByteSecret(secret)
decoded := c.UnmarshalByteSecret(encoded)
if decoded == nil {
t.Fatal(err)
}
// Check masking
// 3 lsb are 0
if decoded[0]<<5 != 0 {
t.Fatalf("Priv. key is not masked (3 lsb should be unset): %X", decoded)
}
// MSB is 0
if decoded[31]>>7 != 0 {
t.Fatalf("Priv. key is not masked (MSB should be unset): %X", decoded)
}
// Second-MSB is 1
if decoded[31]>>6 != 1 {
t.Fatalf("Priv. key is not masked (second MSB should be set): %X", decoded)
}
}
|
