path: root/p2p/crypto_test.go

package p2p

import (
    "bytes"
    "crypto/ecdsa"
    "crypto/rand"
    "net"
    "testing"

    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/crypto/ecies"
)

func TestPublicKeyEncoding(t *testing.T) {
    prv0, _ := crypto.GenerateKey() // = ecdsa.GenerateKey(crypto.S256(), rand.Reader)
    pub0 := &prv0.PublicKey
    pub0s := crypto.FromECDSAPub(pub0)
    pub1, err := importPublicKey(pub0s)
    if err != nil {
        t.Errorf("%v", err)
    }
    eciesPub1 := ecies.ImportECDSAPublic(pub1)
    if eciesPub1 == nil {
        t.Errorf("invalid ecdsa public key")
    }
    pub1s, err := exportPublicKey(pub1)
    if err != nil {
        t.Errorf("%v", err)
    }
    if len(pub1s) != 64 {
        t.Errorf("wrong length expect 64, got", len(pub1s))
    }
    pub2, err := importPublicKey(pub1s)
    if err != nil {
        t.Errorf("%v", err)
    }
    pub2s, err := exportPublicKey(pub2)
    if err != nil {
        t.Errorf("%v", err)
    }
    if !bytes.Equal(pub1s, pub2s) {
        t.Errorf("exports dont match")
    }
    pub2sEC := crypto.FromECDSAPub(pub2)
    if !bytes.Equal(pub0s, pub2sEC) {
        t.Errorf("exports dont match")
    }
}

func TestSharedSecret(t *testing.T) {
    prv0, _ := crypto.GenerateKey() // = ecdsa.GenerateKey(crypto.S256(), rand.Reader)
    pub0 := &prv0.PublicKey
    prv1, _ := crypto.GenerateKey()
    pub1 := &prv1.PublicKey

    ss0, err := ecies.ImportECDSA(prv0).GenerateShared(ecies.ImportECDSAPublic(pub1), sskLen, sskLen)
    if err != nil {
        return
    }
    ss1, err := ecies.ImportECDSA(prv1).GenerateShared(ecies.ImportECDSAPublic(pub0), sskLen, sskLen)
    if err != nil {
        return
    }
    t.Logf("Secret:\n%v %x\n%v %x", len(ss0), ss0, len(ss0), ss1)
    if !bytes.Equal(ss0, ss1) {
        t.Errorf("dont match :(")
    }
}

func TestCryptoHandshake(t *testing.T) {
    testCryptoHandshake(newkey(), newkey(), nil, t)
}

func TestCryptoHandshakeWithToken(t *testing.T) {
    sessionToken := make([]byte, shaLen)
    rand.Read(sessionToken)
    testCryptoHandshake(newkey(), newkey(), sessionToken, t)
}

func testCryptoHandshake(prv0, prv1 *ecdsa.PrivateKey, sessionToken []byte, t *testing.T) {
    var err error
    // pub0 := &prv0.PublicKey
    pub1 := &prv1.PublicKey

    // pub0s := crypto.FromECDSAPub(pub0)
    pub1s := crypto.FromECDSAPub(pub1)

    // simulate handshake by feeding output to input
    // initiator sends handshake 'auth'
    auth, initNonce, randomPrivKey, err := authMsg(prv0, pub1s, sessionToken)
    if err != nil {
        t.Errorf("%v", err)
    }
    t.Logf("-> %v", hexkey(auth))

    // receiver reads auth and responds with response
    response, remoteRecNonce, remoteInitNonce, _, remoteRandomPrivKey, remoteInitRandomPubKey, err := authResp(auth, sessionToken, prv1)
    if err != nil {
        t.Errorf("%v", err)
    }
    t.Logf("<- %v\n", hexkey(response))

    // initiator reads receiver's response and the key exchange completes
    recNonce, remoteRandomPubKey, _, err := completeHandshake(response, prv0)
    if err != nil {
        t.Errorf("completeHandshake error: %v", err)
    }

    // now both parties should have the same session parameters
    initSessionToken, err := newSession(initNonce, recNonce, randomPrivKey, remoteRandomPubKey)
    if err != nil {
        t.Errorf("newSession error: %v", err)
    }

    recSessionToken, err := newSession(remoteInitNonce, remoteRecNonce, remoteRandomPrivKey, remoteInitRandomPubKey)
    if err != nil {
        t.Errorf("newSession error: %v", err)
    }

    // fmt.Printf("\nauth (%v) %x\n\nresp (%v) %x\n\n", len(auth), auth, len(response), response)

    // fmt.Printf("\nauth %x\ninitNonce %x\nresponse%x\nremoteRecNonce %x\nremoteInitNonce %x\nremoteRandomPubKey %x\nrecNonce %x\nremoteInitRandomPubKey %x\ninitSessionToken %x\n\n", auth, initNonce, response, remoteRecNonce, remoteInitNonce, remoteRandomPubKey, recNonce, remoteInitRandomPubKey, initSessionToken)

    if !bytes.Equal(initNonce, remoteInitNonce) {
        t.Errorf("nonces do not match")
    }
    if !bytes.Equal(recNonce, remoteRecNonce) {
        t.Errorf("receiver nonces do not match")
    }
    if !bytes.Equal(initSessionToken, recSessionToken) {
        t.Errorf("session tokens do not match")
    }
}

func TestHandshake(t *testing.T) {
    defer testlog(t).detach()

    prv0, _ := crypto.GenerateKey()
    prv1, _ := crypto.GenerateKey()
    pub0s, _ := exportPublicKey(&prv0.PublicKey)
    pub1s, _ := exportPublicKey(&prv1.PublicKey)
    rw0, rw1 := net.Pipe()
    tokens := make(chan []byte)

    go func() {
        token, err := outboundEncHandshake(rw0, prv0, pub1s, nil)
        if err != nil {
            t.Errorf("outbound side error: %v", err)
        }
        tokens <- token
    }()
    go func() {
        token, remotePubkey, err := inboundEncHandshake(rw1, prv1, nil)
        if err != nil {
            t.Errorf("inbound side error: %v", err)
        }
        if !bytes.Equal(remotePubkey, pub0s) {
            t.Errorf("inbound side returned wrong remote pubkey\n  got:  %x\n  want: %x", remotePubkey, pub0s)
        }
        tokens <- token
    }()

    t1, t2 := <-tokens, <-tokens
    if !bytes.Equal(t1, t2) {
        t.Error("session token mismatch")
    }
}