1 files changed, 112 insertions, 0 deletions
diff --git a/src/crypto/aes/modes_test.go b/src/crypto/aes/modes_test.go
new file mode 100644
index 0000000..a3364c9
--- /dev/null
+++ b/src/crypto/aes/modes_test.go
@@ -0,0 +1,112 @@
+// Copyright 2016 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 aes
+
+import (
+	"crypto/cipher"
+	"testing"
+)
+
+// Check that the optimized implementations of cipher modes will
+// be picked up correctly.
+
+// testInterface can be asserted to check that a type originates
+// from this test group.
+type testInterface interface {
+	InAESPackage() bool
+}
+
+// testBlock implements the cipher.Block interface and any *Able
+// interfaces that need to be tested.
+type testBlock struct{}
+
+func (*testBlock) BlockSize() int      { return 0 }
+func (*testBlock) Encrypt(a, b []byte) {}
+func (*testBlock) Decrypt(a, b []byte) {}
+func (*testBlock) NewGCM(int, int) (cipher.AEAD, error) {
+	return &testAEAD{}, nil
+}
+func (*testBlock) NewCBCEncrypter([]byte) cipher.BlockMode {
+	return &testBlockMode{}
+}
+func (*testBlock) NewCBCDecrypter([]byte) cipher.BlockMode {
+	return &testBlockMode{}
+}
+func (*testBlock) NewCTR([]byte) cipher.Stream {
+	return &testStream{}
+}
+
+// testAEAD implements the cipher.AEAD interface.
+type testAEAD struct{}
+
+func (*testAEAD) NonceSize() int                         { return 0 }
+func (*testAEAD) Overhead() int                          { return 0 }
+func (*testAEAD) Seal(a, b, c, d []byte) []byte          { return []byte{} }
+func (*testAEAD) Open(a, b, c, d []byte) ([]byte, error) { return []byte{}, nil }
+func (*testAEAD) InAESPackage() bool                     { return true }
+
+// Test the gcmAble interface is detected correctly by the cipher package.
+func TestGCMAble(t *testing.T) {
+	b := cipher.Block(&testBlock{})
+	if _, ok := b.(gcmAble); !ok {
+		t.Fatalf("testBlock does not implement the gcmAble interface")
+	}
+	aead, err := cipher.NewGCM(b)
+	if err != nil {
+		t.Fatalf("%v", err)
+	}
+	if _, ok := aead.(testInterface); !ok {
+		t.Fatalf("cipher.NewGCM did not use gcmAble interface")
+	}
+}
+
+// testBlockMode implements the cipher.BlockMode interface.
+type testBlockMode struct{}
+
+func (*testBlockMode) BlockSize() int          { return 0 }
+func (*testBlockMode) CryptBlocks(a, b []byte) {}
+func (*testBlockMode) InAESPackage() bool      { return true }
+
+// Test the cbcEncAble interface is detected correctly by the cipher package.
+func TestCBCEncAble(t *testing.T) {
+	b := cipher.Block(&testBlock{})
+	if _, ok := b.(cbcEncAble); !ok {
+		t.Fatalf("testBlock does not implement the cbcEncAble interface")
+	}
+	bm := cipher.NewCBCEncrypter(b, []byte{})
+	if _, ok := bm.(testInterface); !ok {
+		t.Fatalf("cipher.NewCBCEncrypter did not use cbcEncAble interface")
+	}
+}
+
+// Test the cbcDecAble interface is detected correctly by the cipher package.
+func TestCBCDecAble(t *testing.T) {
+	b := cipher.Block(&testBlock{})
+	if _, ok := b.(cbcDecAble); !ok {
+		t.Fatalf("testBlock does not implement the cbcDecAble interface")
+	}
+	bm := cipher.NewCBCDecrypter(b, []byte{})
+	if _, ok := bm.(testInterface); !ok {
+		t.Fatalf("cipher.NewCBCDecrypter did not use cbcDecAble interface")
+	}
+}
+
+// testStream implements the cipher.Stream interface.
+type testStream struct{}
+
+func (*testStream) XORKeyStream(a, b []byte) {}
+func (*testStream) InAESPackage() bool       { return true }
+
+// Test the ctrAble interface is detected correctly by the cipher package.
+func TestCTRAble(t *testing.T) {
+	b := cipher.Block(&testBlock{})
+	if _, ok := b.(ctrAble); !ok {
+		t.Fatalf("testBlock does not implement the ctrAble interface")
+	}
+	s := cipher.NewCTR(b, []byte{})
+	if _, ok := s.(testInterface); !ok {
+		t.Fatalf("cipher.NewCTR did not use ctrAble interface")
+	}
+}