1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// CTR AES test vectors.
6
7// See U.S. National Institute of Standards and Technology (NIST)
8// Special Publication 800-38A, ``Recommendation for Block Cipher
9// Modes of Operation,'' 2001 Edition, pp. 55-58.
10
11package cipher_test
12
13import (
14	"bytes"
15	"crypto/aes"
16	"crypto/cipher"
17	"testing"
18)
19
20var commonCounter = []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}
21
22var ctrAESTests = []struct {
23	name string
24	key  []byte
25	iv   []byte
26	in   []byte
27	out  []byte
28}{
29	// NIST SP 800-38A pp 55-58
30	{
31		"CTR-AES128",
32		commonKey128,
33		commonCounter,
34		commonInput,
35		[]byte{
36			0x87, 0x4d, 0x61, 0x91, 0xb6, 0x20, 0xe3, 0x26, 0x1b, 0xef, 0x68, 0x64, 0x99, 0x0d, 0xb6, 0xce,
37			0x98, 0x06, 0xf6, 0x6b, 0x79, 0x70, 0xfd, 0xff, 0x86, 0x17, 0x18, 0x7b, 0xb9, 0xff, 0xfd, 0xff,
38			0x5a, 0xe4, 0xdf, 0x3e, 0xdb, 0xd5, 0xd3, 0x5e, 0x5b, 0x4f, 0x09, 0x02, 0x0d, 0xb0, 0x3e, 0xab,
39			0x1e, 0x03, 0x1d, 0xda, 0x2f, 0xbe, 0x03, 0xd1, 0x79, 0x21, 0x70, 0xa0, 0xf3, 0x00, 0x9c, 0xee,
40		},
41	},
42	{
43		"CTR-AES192",
44		commonKey192,
45		commonCounter,
46		commonInput,
47		[]byte{
48			0x1a, 0xbc, 0x93, 0x24, 0x17, 0x52, 0x1c, 0xa2, 0x4f, 0x2b, 0x04, 0x59, 0xfe, 0x7e, 0x6e, 0x0b,
49			0x09, 0x03, 0x39, 0xec, 0x0a, 0xa6, 0xfa, 0xef, 0xd5, 0xcc, 0xc2, 0xc6, 0xf4, 0xce, 0x8e, 0x94,
50			0x1e, 0x36, 0xb2, 0x6b, 0xd1, 0xeb, 0xc6, 0x70, 0xd1, 0xbd, 0x1d, 0x66, 0x56, 0x20, 0xab, 0xf7,
51			0x4f, 0x78, 0xa7, 0xf6, 0xd2, 0x98, 0x09, 0x58, 0x5a, 0x97, 0xda, 0xec, 0x58, 0xc6, 0xb0, 0x50,
52		},
53	},
54	{
55		"CTR-AES256",
56		commonKey256,
57		commonCounter,
58		commonInput,
59		[]byte{
60			0x60, 0x1e, 0xc3, 0x13, 0x77, 0x57, 0x89, 0xa5, 0xb7, 0xa7, 0xf5, 0x04, 0xbb, 0xf3, 0xd2, 0x28,
61			0xf4, 0x43, 0xe3, 0xca, 0x4d, 0x62, 0xb5, 0x9a, 0xca, 0x84, 0xe9, 0x90, 0xca, 0xca, 0xf5, 0xc5,
62			0x2b, 0x09, 0x30, 0xda, 0xa2, 0x3d, 0xe9, 0x4c, 0xe8, 0x70, 0x17, 0xba, 0x2d, 0x84, 0x98, 0x8d,
63			0xdf, 0xc9, 0xc5, 0x8d, 0xb6, 0x7a, 0xad, 0xa6, 0x13, 0xc2, 0xdd, 0x08, 0x45, 0x79, 0x41, 0xa6,
64		},
65	},
66}
67
68func TestCTR_AES(t *testing.T) {
69	for _, tt := range ctrAESTests {
70		test := tt.name
71
72		c, err := aes.NewCipher(tt.key)
73		if err != nil {
74			t.Errorf("%s: NewCipher(%d bytes) = %s", test, len(tt.key), err)
75			continue
76		}
77
78		for j := 0; j <= 5; j += 5 {
79			in := tt.in[0 : len(tt.in)-j]
80			ctr := cipher.NewCTR(c, tt.iv)
81			encrypted := make([]byte, len(in))
82			ctr.XORKeyStream(encrypted, in)
83			if out := tt.out[0:len(in)]; !bytes.Equal(out, encrypted) {
84				t.Errorf("%s/%d: CTR\ninpt %x\nhave %x\nwant %x", test, len(in), in, encrypted, out)
85			}
86		}
87
88		for j := 0; j <= 7; j += 7 {
89			in := tt.out[0 : len(tt.out)-j]
90			ctr := cipher.NewCTR(c, tt.iv)
91			plain := make([]byte, len(in))
92			ctr.XORKeyStream(plain, in)
93			if out := tt.in[0:len(in)]; !bytes.Equal(out, plain) {
94				t.Errorf("%s/%d: CTRReader\nhave %x\nwant %x", test, len(out), plain, out)
95			}
96		}
97
98		if t.Failed() {
99			break
100		}
101	}
102}
103