// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cipher_test
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/des"
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"testing"
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)
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func TestCryptBlocks(t *testing.T) {
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buf := make([]byte, 16)
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block, _ := aes.NewCipher(buf)
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mode := cipher.NewCBCDecrypter(block, buf)
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mustPanic(t, "crypto/cipher: input not full blocks", func() { mode.CryptBlocks(buf, buf[:3]) })
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mustPanic(t, "crypto/cipher: output smaller than input", func() { mode.CryptBlocks(buf[:3], buf) })
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mode = cipher.NewCBCEncrypter(block, buf)
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mustPanic(t, "crypto/cipher: input not full blocks", func() { mode.CryptBlocks(buf, buf[:3]) })
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mustPanic(t, "crypto/cipher: output smaller than input", func() { mode.CryptBlocks(buf[:3], buf) })
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}
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func mustPanic(t *testing.T, msg string, f func()) {
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defer func() {
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err := recover()
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if err == nil {
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t.Errorf("function did not panic, wanted %q", msg)
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} else if err != msg {
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t.Errorf("got panic %v, wanted %q", err, msg)
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}
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}()
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f()
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}
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func TestEmptyPlaintext(t *testing.T) {
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var key [16]byte
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a, err := aes.NewCipher(key[:16])
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if err != nil {
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t.Fatal(err)
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}
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d, err := des.NewCipher(key[:8])
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if err != nil {
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t.Fatal(err)
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}
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s := 16
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pt := make([]byte, s)
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ct := make([]byte, s)
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for i := 0; i < 16; i++ {
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pt[i], ct[i] = byte(i), byte(i)
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}
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assertEqual := func(name string, got, want []byte) {
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if !bytes.Equal(got, want) {
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t.Fatalf("%s: got %v, want %v", name, got, want)
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}
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}
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for _, b := range []cipher.Block{a, d} {
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iv := make([]byte, b.BlockSize())
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cbce := cipher.NewCBCEncrypter(b, iv)
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cbce.CryptBlocks(ct, pt[:0])
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assertEqual("CBC encrypt", ct, pt)
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cbcd := cipher.NewCBCDecrypter(b, iv)
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cbcd.CryptBlocks(ct, pt[:0])
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assertEqual("CBC decrypt", ct, pt)
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cfbe := cipher.NewCFBEncrypter(b, iv)
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cfbe.XORKeyStream(ct, pt[:0])
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assertEqual("CFB encrypt", ct, pt)
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cfbd := cipher.NewCFBDecrypter(b, iv)
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cfbd.XORKeyStream(ct, pt[:0])
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assertEqual("CFB decrypt", ct, pt)
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ctr := cipher.NewCTR(b, iv)
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ctr.XORKeyStream(ct, pt[:0])
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assertEqual("CTR", ct, pt)
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ofb := cipher.NewOFB(b, iv)
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ofb.XORKeyStream(ct, pt[:0])
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assertEqual("OFB", ct, pt)
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}
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}
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