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// OFB 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. 52-55.
10
11package cipher_test
12
13import (
14	"bytes"
15	"crypto/aes"
16	"crypto/cipher"
17	"testing"
18)
19
20type ofbTest struct {
21	name string
22	key  []byte
23	iv   []byte
24	in   []byte
25	out  []byte
26}
27
28var ofbTests = []ofbTest{
29	// NIST SP 800-38A pp 52-55
30	{
31		"OFB-AES128",
32		commonKey128,
33		commonIV,
34		commonInput,
35		[]byte{
36			0x3b, 0x3f, 0xd9, 0x2e, 0xb7, 0x2d, 0xad, 0x20, 0x33, 0x34, 0x49, 0xf8, 0xe8, 0x3c, 0xfb, 0x4a,
37			0x77, 0x89, 0x50, 0x8d, 0x16, 0x91, 0x8f, 0x03, 0xf5, 0x3c, 0x52, 0xda, 0xc5, 0x4e, 0xd8, 0x25,
38			0x97, 0x40, 0x05, 0x1e, 0x9c, 0x5f, 0xec, 0xf6, 0x43, 0x44, 0xf7, 0xa8, 0x22, 0x60, 0xed, 0xcc,
39			0x30, 0x4c, 0x65, 0x28, 0xf6, 0x59, 0xc7, 0x78, 0x66, 0xa5, 0x10, 0xd9, 0xc1, 0xd6, 0xae, 0x5e,
40		},
41	},
42	{
43		"OFB-AES192",
44		commonKey192,
45		commonIV,
46		commonInput,
47		[]byte{
48			0xcd, 0xc8, 0x0d, 0x6f, 0xdd, 0xf1, 0x8c, 0xab, 0x34, 0xc2, 0x59, 0x09, 0xc9, 0x9a, 0x41, 0x74,
49			0xfc, 0xc2, 0x8b, 0x8d, 0x4c, 0x63, 0x83, 0x7c, 0x09, 0xe8, 0x17, 0x00, 0xc1, 0x10, 0x04, 0x01,
50			0x8d, 0x9a, 0x9a, 0xea, 0xc0, 0xf6, 0x59, 0x6f, 0x55, 0x9c, 0x6d, 0x4d, 0xaf, 0x59, 0xa5, 0xf2,
51			0x6d, 0x9f, 0x20, 0x08, 0x57, 0xca, 0x6c, 0x3e, 0x9c, 0xac, 0x52, 0x4b, 0xd9, 0xac, 0xc9, 0x2a,
52		},
53	},
54	{
55		"OFB-AES256",
56		commonKey256,
57		commonIV,
58		commonInput,
59		[]byte{
60			0xdc, 0x7e, 0x84, 0xbf, 0xda, 0x79, 0x16, 0x4b, 0x7e, 0xcd, 0x84, 0x86, 0x98, 0x5d, 0x38, 0x60,
61			0x4f, 0xeb, 0xdc, 0x67, 0x40, 0xd2, 0x0b, 0x3a, 0xc8, 0x8f, 0x6a, 0xd8, 0x2a, 0x4f, 0xb0, 0x8d,
62			0x71, 0xab, 0x47, 0xa0, 0x86, 0xe8, 0x6e, 0xed, 0xf3, 0x9d, 0x1c, 0x5b, 0xba, 0x97, 0xc4, 0x08,
63			0x01, 0x26, 0x14, 0x1d, 0x67, 0xf3, 0x7b, 0xe8, 0x53, 0x8f, 0x5a, 0x8b, 0xe7, 0x40, 0xe4, 0x84,
64		},
65	},
66}
67
68func TestOFB(t *testing.T) {
69	for _, tt := range ofbTests {
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			plaintext := tt.in[0 : len(tt.in)-j]
80			ofb := cipher.NewOFB(c, tt.iv)
81			ciphertext := make([]byte, len(plaintext))
82			ofb.XORKeyStream(ciphertext, plaintext)
83			if !bytes.Equal(ciphertext, tt.out[:len(plaintext)]) {
84				t.Errorf("%s/%d: encrypting\ninput % x\nhave % x\nwant % x", test, len(plaintext), plaintext, ciphertext, tt.out)
85			}
86		}
87
88		for j := 0; j <= 5; j += 5 {
89			ciphertext := tt.out[0 : len(tt.in)-j]
90			ofb := cipher.NewOFB(c, tt.iv)
91			plaintext := make([]byte, len(ciphertext))
92			ofb.XORKeyStream(plaintext, ciphertext)
93			if !bytes.Equal(plaintext, tt.in[:len(ciphertext)]) {
94				t.Errorf("%s/%d: decrypting\nhave % x\nwant % x", test, len(ciphertext), plaintext, tt.in)
95			}
96		}
97
98		if t.Failed() {
99			break
100		}
101	}
102}
103