initial import

core/codec/dh_test.go

@@ -0,0 +1,73 @@
+package codec
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDiffieHellman(t *testing.T) {
+	key1, err := GenerateKey()
+	assert.Nil(t, err)
+	key2, err := GenerateKey()
+	assert.Nil(t, err)
+
+	pubKey1, err := ComputeKey(key1.PubKey, key2.PriKey)
+	assert.Nil(t, err)
+	pubKey2, err := ComputeKey(key2.PubKey, key1.PriKey)
+	assert.Nil(t, err)
+
+	assert.Equal(t, pubKey1, pubKey2)
+}
+
+func TestDiffieHellman1024(t *testing.T) {
+	old := p
+	p, _ = new(big.Int).SetString("F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88B31C7C5B2D8EF6F3C923C043F0A55B188D8EBB558CB85D38D334FD7C175743A31D186CDE33212CB52AFF3CE1B1294018118D7C84A70A72D686C40319C807297ACA950CD9969FABD00A509B0246D3083D66A45D419F9C7CBD894B221926BAABA25EC355E92F78C7", 16)
+	defer func() {
+		p = old
+	}()
+
+	key1, err := GenerateKey()
+	assert.Nil(t, err)
+	key2, err := GenerateKey()
+	assert.Nil(t, err)
+
+	pubKey1, err := ComputeKey(key1.PubKey, key2.PriKey)
+	assert.Nil(t, err)
+	pubKey2, err := ComputeKey(key2.PubKey, key1.PriKey)
+	assert.Nil(t, err)
+
+	assert.Equal(t, pubKey1, pubKey2)
+}
+
+func TestDiffieHellmanMiddleManAttack(t *testing.T) {
+	key1, err := GenerateKey()
+	assert.Nil(t, err)
+	keyMiddle, err := GenerateKey()
+	assert.Nil(t, err)
+	key2, err := GenerateKey()
+	assert.Nil(t, err)
+
+	const aesByteLen = 32
+	pubKey1, err := ComputeKey(keyMiddle.PubKey, key1.PriKey)
+	assert.Nil(t, err)
+	src := []byte(`hello, world!`)
+	encryptedSrc, err := EcbEncrypt(pubKey1.Bytes()[:aesByteLen], src)
+	assert.Nil(t, err)
+	pubKeyMiddle, err := ComputeKey(key1.PubKey, keyMiddle.PriKey)
+	assert.Nil(t, err)
+	decryptedSrc, err := EcbDecrypt(pubKeyMiddle.Bytes()[:aesByteLen], encryptedSrc)
+	assert.Nil(t, err)
+	assert.Equal(t, string(src), string(decryptedSrc))
+
+	pubKeyMiddle, err = ComputeKey(key2.PubKey, keyMiddle.PriKey)
+	assert.Nil(t, err)
+	encryptedSrc, err = EcbEncrypt(pubKeyMiddle.Bytes()[:aesByteLen], decryptedSrc)
+	assert.Nil(t, err)
+	pubKey2, err := ComputeKey(keyMiddle.PubKey, key2.PriKey)
+	assert.Nil(t, err)
+	decryptedSrc, err = EcbDecrypt(pubKey2.Bytes()[:aesByteLen], encryptedSrc)
+	assert.Nil(t, err)
+	assert.Equal(t, string(src), string(decryptedSrc))
+}