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public_key_test.go
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public_key_test.go
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package e2ee
import (
"crypto/rand"
"io"
"testing"
"github.com/stretchr/testify/assert"
"golang.org/x/crypto/curve25519"
)
func TestEd25519ToX25519(t *testing.T) {
ed25519KeyPair1, err := generateEd25519KeyPair()
assert.Nil(t, err)
ed25519KeyPair2, err := generateEd25519KeyPair()
assert.Nil(t, err)
x25519PrivateKey1 := ed25519KeyPair1.privateEd25519KeyToCurve25519()
x25519PublicKey1, err := ed25519KeyPair1.publicEd25519KeyToCurve25519()
assert.Nil(t, err)
x25519PrivateKey2 := ed25519KeyPair2.privateEd25519KeyToCurve25519()
x25519PublicKey2, err := ed25519KeyPair2.publicEd25519KeyToCurve25519()
assert.Nil(t, err)
var pmk1 [32]byte
var pmk2 [32]byte
curve25519.ScalarMult(&pmk1, &x25519PrivateKey2, &x25519PublicKey1)
curve25519.ScalarMult(&pmk2, &x25519PrivateKey1, &x25519PublicKey2)
assert.Equal(t, pmk1, pmk2)
}
func TestDH(t *testing.T) {
sRatchetPrivateKey := make([]byte, curve25519.ScalarSize)
_, err := io.ReadFull(rand.Reader, sRatchetPrivateKey)
assert.Nil(t, err)
// これは相手に送りつける
// 毎回変える
sRatchetPubKey, err := curve25519.X25519(sRatchetPrivateKey, curve25519.Basepoint)
assert.Nil(t, err)
rSignedPrePrivateKey := make([]byte, curve25519.ScalarSize)
_, err = io.ReadFull(rand.Reader, rSignedPrePrivateKey)
assert.Nil(t, err)
// これは相手に送りつける
// 毎回変える
rSignedPrePubKey, err := curve25519.X25519(rSignedPrePrivateKey, curve25519.Basepoint)
assert.Nil(t, err)
sA, rA := a(sRatchetPrivateKey, sRatchetPubKey, rSignedPrePrivateKey, rSignedPrePubKey)
assert.Equal(t, sA, rA)
}
func a(srsk []byte, srpk []byte, rspsk []byte, rsppk []byte) ([32]byte, [32]byte) {
var sRatchetPrivateKey [32]byte
copy(sRatchetPrivateKey[:], srsk)
var sRatchetPubKey [32]byte
copy(sRatchetPubKey[:], srpk)
var rSignedPrePrivateKey [32]byte
copy(rSignedPrePrivateKey[:], rspsk)
var rSignedPrePubKey [32]byte
copy(rSignedPrePubKey[:], rsppk)
var sA [32]byte
curve25519.ScalarMult(&sA, &sRatchetPrivateKey, &rSignedPrePubKey)
var rA [32]byte
curve25519.ScalarMult(&rA, &rSignedPrePrivateKey, &sRatchetPubKey)
return sA, rA
}