fix subrepo break change

modules/crypto/ssh/cipher_test.go

@@ -0,0 +1,127 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ssh
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/aes"
+	"crypto/rand"
+	"testing"
+)
+
+func TestDefaultCiphersExist(t *testing.T) {
+	for _, cipherAlgo := range supportedCiphers {
+		if _, ok := cipherModes[cipherAlgo]; !ok {
+			t.Errorf("default cipher %q is unknown", cipherAlgo)
+		}
+	}
+}
+
+func TestPacketCiphers(t *testing.T) {
+	// Still test aes128cbc cipher althought it's commented out.
+	cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil}
+	defer delete(cipherModes, aes128cbcID)
+
+	for cipher := range cipherModes {
+		kr := &kexResult{Hash: crypto.SHA1}
+		algs := directionAlgorithms{
+			Cipher:      cipher,
+			MAC:         "hmac-sha1",
+			Compression: "none",
+		}
+		client, err := newPacketCipher(clientKeys, algs, kr)
+		if err != nil {
+			t.Errorf("newPacketCipher(client, %q): %v", cipher, err)
+			continue
+		}
+		server, err := newPacketCipher(clientKeys, algs, kr)
+		if err != nil {
+			t.Errorf("newPacketCipher(client, %q): %v", cipher, err)
+			continue
+		}
+
+		want := "bla bla"
+		input := []byte(want)
+		buf := &bytes.Buffer{}
+		if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
+			t.Errorf("writePacket(%q): %v", cipher, err)
+			continue
+		}
+
+		packet, err := server.readPacket(0, buf)
+		if err != nil {
+			t.Errorf("readPacket(%q): %v", cipher, err)
+			continue
+		}
+
+		if string(packet) != want {
+			t.Errorf("roundtrip(%q): got %q, want %q", cipher, packet, want)
+		}
+	}
+}
+
+func TestCBCOracleCounterMeasure(t *testing.T) {
+	cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil}
+	defer delete(cipherModes, aes128cbcID)
+
+	kr := &kexResult{Hash: crypto.SHA1}
+	algs := directionAlgorithms{
+		Cipher:      aes128cbcID,
+		MAC:         "hmac-sha1",
+		Compression: "none",
+	}
+	client, err := newPacketCipher(clientKeys, algs, kr)
+	if err != nil {
+		t.Fatalf("newPacketCipher(client): %v", err)
+	}
+
+	want := "bla bla"
+	input := []byte(want)
+	buf := &bytes.Buffer{}
+	if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
+		t.Errorf("writePacket: %v", err)
+	}
+
+	packetSize := buf.Len()
+	buf.Write(make([]byte, 2*maxPacket))
+
+	// We corrupt each byte, but this usually will only test the
+	// 'packet too large' or 'MAC failure' cases.
+	lastRead := -1
+	for i := 0; i < packetSize; i++ {
+		server, err := newPacketCipher(clientKeys, algs, kr)
+		if err != nil {
+			t.Fatalf("newPacketCipher(client): %v", err)
+		}
+
+		fresh := &bytes.Buffer{}
+		fresh.Write(buf.Bytes())
+		fresh.Bytes()[i] ^= 0x01
+
+		before := fresh.Len()
+		_, err = server.readPacket(0, fresh)
+		if err == nil {
+			t.Errorf("corrupt byte %d: readPacket succeeded ", i)
+			continue
+		}
+		if _, ok := err.(cbcError); !ok {
+			t.Errorf("corrupt byte %d: got %v (%T), want cbcError", i, err, err)
+			continue
+		}
+
+		after := fresh.Len()
+		bytesRead := before - after
+		if bytesRead < maxPacket {
+			t.Errorf("corrupt byte %d: read %d bytes, want more than %d", i, bytesRead, maxPacket)
+			continue
+		}
+
+		if i > 0 && bytesRead != lastRead {
+			t.Errorf("corrupt byte %d: read %d bytes, want %d bytes read", i, bytesRead, lastRead)
+		}
+		lastRead = bytesRead
+	}
+}