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