mbedtls 0.13.6

Idiomatic Rust wrapper for MbedTLS, allowing you to use MbedTLS with only safe code while being able to use such great Rust features like error handling and closures. Building on MbedTLS's focus on embedded use, this crate can be used in a no_std environment.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230

/* Copyright (c) Fortanix, Inc.
 *
 * Licensed under the GNU General Public License, version 2 <LICENSE-GPL or
 * https://www.gnu.org/licenses/gpl-2.0.html> or the Apache License, Version
 * 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>, at your
 * option. This file may not be copied, modified, or distributed except
 * according to those terms. */

use mbedtls::cipher;
use mbedtls::cipher::raw::{CipherId, CipherMode, CipherPadding};
use mbedtls::cipher::{Authenticated, Cipher, Decryption, Encryption, Fresh, Traditional};
use serde_cbor::{de, ser};

const ZERO_16B: &'static [u8] = &[0u8; 16];

#[test]
fn save_restore_aes_cbc_enc_nopad() {
    let mut ct: [u8; 48] = [0; 48];
    let expected_ct: [u8; 32] = [
        0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e, 0xf7, 0x95, 0xbd, 0x4a,
        0x52, 0xe2, 0x9e, 0xd7, 0x13, 0xd3, 0x13, 0xfa, 0x20, 0xe9, 0x8d, 0xbc,
    ];

    let mut cipher = cipher::Cipher::<Encryption, Traditional, Fresh>::new(CipherId::Aes, CipherMode::CBC, 128).unwrap();
    cipher.set_padding(CipherPadding::None).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    let (len1, cipher_d1) = cipher_k.update(ZERO_16B, &mut ct[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();
    // use rustc_serialize::hex::ToHex;
    // println!("{:?}", saved.as_slice().to_hex());

    let cipher_r = de::from_slice::<Cipher<Encryption, Traditional, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(ZERO_16B, &mut ct[16..48]).unwrap();
    assert_eq!(len2, 16);

    let (len3, _) = cipher_d2.finish(&mut ct[32..48]).unwrap();
    assert_eq!(len3, 0);
    assert_eq!(&ct[0..32], &expected_ct[..]);
}

#[test]
fn save_restore_aes_cbc_enc_pkcs7() {
    let mut ct: [u8; 48] = [0; 48];
    let expected_ct: [u8; 48] = [
        0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e, 0xf7, 0x95, 0xbd, 0x4a,
        0x52, 0xe2, 0x9e, 0xd7, 0x13, 0xd3, 0x13, 0xfa, 0x20, 0xe9, 0x8d, 0xbc, 0x5c, 0x04, 0x76, 0x16, 0x75, 0x6f, 0xdc, 0x1c,
        0x32, 0xe0, 0xdf, 0x6e, 0x8c, 0x59, 0xbb, 0x2a,
    ];

    let mut cipher = cipher::Cipher::<Encryption, Traditional, Fresh>::new(CipherId::Aes, CipherMode::CBC, 128).unwrap();
    cipher.set_padding(CipherPadding::Pkcs7).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    let (len1, cipher_d1) = cipher_k.update(ZERO_16B, &mut ct[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();
    // use rustc_serialize::hex::ToHex;
    // println!("{:?}", saved.as_slice().to_hex());

    let cipher_r = de::from_slice::<Cipher<Encryption, Traditional, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(ZERO_16B, &mut ct[16..48]).unwrap();
    assert_eq!(len2, 16);

    let (len3, _) = cipher_d2.finish(&mut ct[32..48]).unwrap();
    assert_eq!(len3, 16);
    assert_eq!(&ct[..], &expected_ct[..]);
}

#[test]
fn save_restore_aes_cbc_dec_nopad() {
    let mut pt: [u8; 48] = [0; 48];
    let ct: [u8; 32] = [
        0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e, 0xf7, 0x95, 0xbd, 0x4a,
        0x52, 0xe2, 0x9e, 0xd7, 0x13, 0xd3, 0x13, 0xfa, 0x20, 0xe9, 0x8d, 0xbc,
    ];

    let mut cipher = cipher::Cipher::<Decryption, Traditional, Fresh>::new(CipherId::Aes, CipherMode::CBC, 128).unwrap();
    cipher.set_padding(CipherPadding::None).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    // For decryption without padding, you can get the data right away, *if* you
    // use Fortanix's patched mbedtls.
    let (len1, cipher_d1) = cipher_k.update(&ct[0..16], &mut pt[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();
    // use rustc_serialize::hex::ToHex;
    // println!("{:?}", saved.as_slice().to_hex());

    let cipher_r = de::from_slice::<Cipher<Decryption, Traditional, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(&ct[16..32], &mut pt[16..48]).unwrap();
    assert_eq!(len2, 16);

    let (len3, _) = cipher_d2.finish(&mut pt[32..48]).unwrap();
    assert_eq!(len3, 0);
    assert_eq!(&pt[0..16], ZERO_16B);
    assert_eq!(&pt[16..32], ZERO_16B);
}

#[test]
fn save_restore_aes_cbc_dec_pkcs7() {
    let mut pt: [u8; 48] = [0; 48];
    let ct: [u8; 48] = [
        0x66, 0xe9, 0x4b, 0xd4, 0xef, 0x8a, 0x2c, 0x3b, 0x88, 0x4c, 0xfa, 0x59, 0xca, 0x34, 0x2b, 0x2e, 0xf7, 0x95, 0xbd, 0x4a,
        0x52, 0xe2, 0x9e, 0xd7, 0x13, 0xd3, 0x13, 0xfa, 0x20, 0xe9, 0x8d, 0xbc, 0x5c, 0x04, 0x76, 0x16, 0x75, 0x6f, 0xdc, 0x1c,
        0x32, 0xe0, 0xdf, 0x6e, 0x8c, 0x59, 0xbb, 0x2a,
    ];

    let mut cipher = cipher::Cipher::<Decryption, Traditional, Fresh>::new(CipherId::Aes, CipherMode::CBC, 128).unwrap();
    cipher.set_padding(CipherPadding::Pkcs7).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    // For decryption with padding, mbedtls keeps the last block until we do
    // `finish()`
    let (len1, cipher_d1) = cipher_k.update(&ct[0..16], &mut pt[0..32]).unwrap();
    assert_eq!(len1, 0);

    let saved = ser::to_vec(&cipher_d1).unwrap();
    // use rustc_serialize::hex::ToHex;
    // println!("{:?}", saved.as_slice().to_hex());

    let cipher_r = de::from_slice::<Cipher<Decryption, Traditional, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(&ct[16..48], &mut pt[0..48]).unwrap();
    assert_eq!(len2, 32);

    let (len3, _) = cipher_d2.finish(&mut pt[32..48]).unwrap();
    assert_eq!(len3, 0);
    assert_eq!(&pt[0..16], ZERO_16B);
    assert_eq!(&pt[16..32], ZERO_16B);
}

#[test]
fn save_restore_wrong_type() {
    let mut ct: [u8; 48] = [0; 48];

    let cipher = cipher::Cipher::<Encryption, Traditional, Fresh>::new(CipherId::Aes, CipherMode::CBC, 128).unwrap();
    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    let (len1, cipher_d1) = cipher_k.update(ZERO_16B, &mut ct[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();

    // Try to restore the saved encrypt state as a decrypt
    de::from_slice::<Cipher<Decryption, Traditional, _>>(saved.as_slice())
        .err()
        .expect("shouldn't have been able to deserialize with wrong operation");
}

#[test]
fn save_restore_aes_gcm_enc() {
    let mut ct: [u8; 48] = [0; 48];
    let expected_ct: [u8; 32] = [
        0xa3, 0xb2, 0x2b, 0x84, 0x49, 0xaf, 0xaf, 0xbc, 0xd6, 0xc0, 0x9f, 0x2c, 0xfa, 0x9d, 0xe2, 0xbe, 0x93, 0x8f, 0x8b, 0xbf,
        0x23, 0x58, 0x63, 0xd0, 0xce, 0x02, 0x84, 0x27, 0x22, 0xfd, 0x50, 0x34,
    ];

    let mut tag: [u8; 8] = [0; 8];
    let expected_tag: [u8; 8] = [0x2a, 0x71, 0x95, 0xb4, 0x4b, 0xf6, 0x3c, 0x2d];

    let cipher = cipher::Cipher::<Encryption, Authenticated, Fresh>::new(CipherId::Aes, CipherMode::GCM, 128).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    let cipher_a = cipher_k.set_ad(ZERO_16B).unwrap();

    let (len1, cipher_d1) = cipher_a.update(ZERO_16B, &mut ct[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();

    let cipher_r = de::from_slice::<Cipher<Encryption, Authenticated, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(ZERO_16B, &mut ct[16..48]).unwrap();
    assert_eq!(len2, 16);

    let (len3, cipher_f) = cipher_d2.finish(&mut ct[32..48]).unwrap();

    cipher_f.write_tag(&mut tag).unwrap();

    assert_eq!(len3, 0);
    assert_eq!(&ct[0..32], &expected_ct[..]);
    assert_eq!(tag, expected_tag);
}

#[test]
fn save_restore_aes_gcm_dec() {
    let mut pt: [u8; 48] = [0; 48];
    let ct: [u8; 32] = [
        0xa3, 0xb2, 0x2b, 0x84, 0x49, 0xaf, 0xaf, 0xbc, 0xd6, 0xc0, 0x9f, 0x2c, 0xfa, 0x9d, 0xe2, 0xbe, 0x93, 0x8f, 0x8b, 0xbf,
        0x23, 0x58, 0x63, 0xd0, 0xce, 0x02, 0x84, 0x27, 0x22, 0xfd, 0x50, 0x34,
    ];
    let tag: [u8; 8] = [0x2a, 0x71, 0x95, 0xb4, 0x4b, 0xf6, 0x3c, 0x2d];

    let cipher = cipher::Cipher::<Decryption, Authenticated, Fresh>::new(CipherId::Aes, CipherMode::GCM, 128).unwrap();

    let cipher_k = cipher.set_key_iv(ZERO_16B, ZERO_16B).unwrap();

    let cipher_a = cipher_k.set_ad(ZERO_16B).unwrap();

    let (len1, cipher_d1) = cipher_a.update(&ct[0..16], &mut pt[0..32]).unwrap();
    assert_eq!(len1, 16);

    let saved = ser::to_vec(&cipher_d1).unwrap();

    let cipher_r = de::from_slice::<Cipher<Decryption, Authenticated, _>>(saved.as_slice()).unwrap();

    let (len2, cipher_d2) = cipher_r.update(&ct[16..32], &mut pt[16..48]).unwrap();
    assert_eq!(len2, 16);

    let (len3, cipher_f) = cipher_d2.finish(&mut pt[32..48]).unwrap();

    cipher_f.check_tag(&tag).unwrap();

    assert_eq!(len3, 0);
    assert_eq!(&pt[0..16], ZERO_16B);
    assert_eq!(&pt[16..32], ZERO_16B);
}