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// Copyright 2009 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 cmac
import (
"bytes"
"crypto/aes"
"encoding/hex"
"encoding/json"
"io/ioutil"
"testing"
)
type cmacAESExample struct {
key []byte
message []byte
tag []byte
}
// Load AES-CMAC test vectors from aes_cmac.tjson
// TODO: switch to a native Go TJSON parser when available
func loadCMACAESExamples() []cmacAESExample {
var examplesJSON map[string]interface{}
exampleData, err := ioutil.ReadFile("../vectors/aes_cmac.tjson")
if err != nil {
panic(err)
}
if err = json.Unmarshal(exampleData, &examplesJSON); err != nil {
panic(err)
}
examplesArray := examplesJSON["examples:A<O>"].([]interface{})
if examplesArray == nil {
panic("no toplevel 'examples:A<O>' key in aes_cmac.tjson")
}
result := make([]cmacAESExample, len(examplesArray))
for i, exampleJSON := range examplesArray {
example := exampleJSON.(map[string]interface{})
keyHex := example["key:d16"].(string)
key := make([]byte, hex.DecodedLen(len(keyHex)))
if _, err := hex.Decode(key, []byte(keyHex)); err != nil {
panic(err)
}
messageHex := example["message:d16"].(string)
message := make([]byte, hex.DecodedLen(len(messageHex)))
if _, err := hex.Decode(message, []byte(messageHex)); err != nil {
panic(err)
}
tagHex := example["tag:d16"].(string)
tag := make([]byte, hex.DecodedLen(len(tagHex)))
if _, err := hex.Decode(tag, []byte(tagHex)); err != nil {
panic(err)
}
result[i] = cmacAESExample{key, message, tag}
}
return result
}
func TestCMACAES(t *testing.T) {
for i, tt := range loadCMACAESExamples() {
c, err := aes.NewCipher(tt.key)
if err != nil {
t.Errorf("test %d: NewCipher: %s", i, err)
continue
}
d := New(c)
n, err := d.Write(tt.message)
if err != nil || n != len(tt.message) {
t.Errorf("test %d: Write %d: %d, %s", i, len(tt.message), n, err)
continue
}
sum := d.Sum(nil)
if !bytes.Equal(sum, tt.tag) {
x := d.(*cmac)
t.Errorf("test %d: tag mismatch\n\twant %x\n\thave %x\n\tk1 %x\n\tk2 %x", i, tt.tag, sum, x.k1, x.k2)
continue
}
}
}
func TestWrite(t *testing.T) {
cmacAESTests := loadCMACAESExamples()
tt := cmacAESTests[len(cmacAESTests)-1]
c, err := aes.NewCipher(tt.key)
if err != nil {
t.Fatal(err)
}
d := New(c)
// Test writing byte-by-byte
for _, b := range tt.message {
_, err := d.Write([]byte{b})
if err != nil {
t.Fatal(err)
}
}
sum := d.Sum(nil)
if !bytes.Equal(sum, tt.tag) {
x := d.(*cmac)
t.Fatalf("write bytes: tag mismatch\n\twant %x\n\thave %x\n\tk1 %x\n\tk2 %x", tt.tag, sum, x.k1, x.k2)
}
// Test writing halves
d.Reset()
_, err = d.Write(tt.message[:len(tt.message)/2])
if err != nil {
t.Fatal(err)
}
_, err = d.Write(tt.message[len(tt.message)/2:])
if err != nil {
t.Fatal(err)
}
sum = d.Sum(nil)
if !bytes.Equal(sum, tt.tag) {
x := d.(*cmac)
t.Fatalf("write halves: tag mismatch\n\twant %x\n\thave %x\n\tk1 %x\n\tk2 %x", tt.tag, sum, x.k1, x.k2)
}
// Test writing third, then the rest
d.Reset()
_, err = d.Write(tt.message[:len(tt.message)/3])
if err != nil {
t.Fatal(err)
}
_, err = d.Write(tt.message[len(tt.message)/3:])
if err != nil {
t.Fatal(err)
}
sum = d.Sum(nil)
if !bytes.Equal(sum, tt.tag) {
x := d.(*cmac)
t.Fatalf("write third: tag mismatch\n\twant %x\n\thave %x\n\tk1 %x\n\tk2 %x", tt.tag, sum, x.k1, x.k2)
}
// Test continuing after Sum
d.Reset()
_, err = d.Write(tt.message[:len(tt.message)/2])
if err != nil {
t.Fatal(err)
}
sum = d.Sum(nil)
_, err = d.Write(tt.message[len(tt.message)/2:])
if err != nil {
t.Fatal(err)
}
sum = d.Sum(nil)
if !bytes.Equal(sum, tt.tag) {
x := d.(*cmac)
t.Fatalf("continue after Sum: tag mismatch\n\twant %x\n\thave %x\n\tk1 %x\n\tk2 %x", tt.tag, sum, x.k1, x.k2)
}
}
func BenchmarkCMAC_AES128(b *testing.B) {
cmacAESTests := loadCMACAESExamples()
c, _ := aes.NewCipher(cmacAESTests[0].key)
v := make([]byte, 1024)
out := make([]byte, 16)
b.SetBytes(int64(len(v)))
for i := 0; i < b.N; i++ {
d := New(c)
_, err := d.Write(v)
if err != nil {
panic(err)
}
out = d.Sum(out[:0])
}
}
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