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
//! TLS pseudo-random function helpers.
//!
//! This module exposes the TLS 1.2 PRF as defined in RFC 5246, Section 5.
//!
//! # Example
//!
//! ```
//! use boring::hash::MessageDigest;
//!
//! let mut out = [0u8; 48];
//! boring::prf::tls1_prf(
//! MessageDigest::sha256(),
//! &mut out,
//! b"secret",
//! b"label",
//! b"seed",
//! )
//! .unwrap();
//! ```
use std::ptr;
use openssl_macros::corresponds;
use crate::cvt;
use crate::error::ErrorStack;
use crate::ffi;
use crate::hash::MessageDigest;
/// Computes TLS 1.2 PRF output using `digest`.
///
/// `seed` should contain the full PRF seed for the calling protocol. In TLS
/// 1.2 this is often a concatenation of random values.
#[corresponds(CRYPTO_tls1_prf)]
pub fn tls1_prf(
digest: MessageDigest,
out: &mut [u8],
secret: &[u8],
label: &[u8],
seed: &[u8],
) -> Result<(), ErrorStack> {
unsafe {
ffi::init();
cvt(ffi::internal::CRYPTO_tls1_prf(
digest.as_ptr(),
out.as_mut_ptr(),
out.len(),
secret.as_ptr(),
secret.len(),
label.as_ptr(),
label.len(),
seed.as_ptr(),
seed.len(),
ptr::null(),
0,
))
}
}
#[cfg(test)]
mod tests {
use hex::FromHex;
use crate::hash::MessageDigest;
#[test]
fn tls12_prf_vectors() {
struct TestVector {
name: &'static str,
digest: fn() -> MessageDigest,
secret: &'static str,
label: &'static [u8],
seed: &'static str,
expected: &'static str,
}
// Test vectors from:
// https://mailarchive.ietf.org/arch/msg/tls/fzVCzk-z3FShgGJ6DOXqM1ydxms/
let vectors = [
TestVector {
name: "TLS1.2 PRF-SHA224",
digest: MessageDigest::sha224,
secret: "e1 88 28 74 03 52 b5 30 d6 9b 34 c6 59 7d ea 2e",
label: b"test label",
seed: "f5 a3 fe 6d 34 e2 e2 85 60 fd ca f6 82 3f 90 91",
expected: "
22 4d 8a f3 c0 45 33 93
a9 77 97 89 d2 1c f7 da
5e e6 2a e6 b6 17 87 3d
48 94 28 ef c8 dd 58 d1
56 6e 70 29 e2 ca 3a 5e
cd 35 5d c6 4d 4d 92 7e
2f bd 78 c4 23 3e 86 04
b1 47 49 a7 7a 92 a7 0f
dd f6 14 bc 0d f6 23 d7
98 60 4e 4c a5 51 27 94
d8 02 a2 58 e8 2f 86 cf
",
},
TestVector {
name: "TLS1.2 PRF-SHA256",
digest: MessageDigest::sha256,
secret: "9b be 43 6b a9 40 f0 17 b1 76 52 84 9a 71 db 35",
label: b"test label",
seed: "a0 ba 9f 93 6c da 31 18 27 a6 f7 96 ff d5 19 8c",
expected: "
e3 f2 29 ba 72 7b e1 7b
8d 12 26 20 55 7c d4 53
c2 aa b2 1d 07 c3 d4 95
32 9b 52 d4 e6 1e db 5a
6b 30 17 91 e9 0d 35 c9
c9 a4 6b 4e 14 ba f9 af
0f a0 22 f7 07 7d ef 17
ab fd 37 97 c0 56 4b ab
4f bc 91 66 6e 9d ef 9b
97 fc e3 4f 79 67 89 ba
a4 80 82 d1 22 ee 42 c5
a7 2e 5a 51 10 ff f7 01
87 34 7b 66
",
},
TestVector {
name: "TLS1.2 PRF-SHA512",
digest: MessageDigest::sha512,
secret: "b0 32 35 23 c1 85 35 99 58 4d 88 56 8b bb 05 eb",
label: b"test label",
seed: "d4 64 0e 12 e4 bc db fb 43 7f 03 e6 ae 41 8e e5",
expected: "
12 61 f5 88 c7 98 c5 c2
01 ff 03 6e 7a 9c b5 ed
cd 7f e3 f9 4c 66 9a 12
2a 46 38 d7 d5 08 b2 83
04 2d f6 78 98 75 c7 14
7e 90 6d 86 8b c7 5c 45
e2 0e b4 0c 1c f4 a1 71
3b 27 37 1f 68 43 25 92
f7 dc 8e a8 ef 22 3e 12
ea 85 07 84 13 11 bf 68
65 3d 0c fc 40 56 d8 11
f0 25 c4 5d df a6 e6 fe
c7 02 f0 54 b4 09 d6 f2
8d d0 a3 23 3e 49 8d a4
1a 3e 75 c5 63 0e ed be
22 fe 25 4e 33 a1 b0 e9
f6 b9 82 66 75 be c7 d0
1a 84 56 58 dc 9c 39 75
45 40 1d 40 b9 f4 6c 7a
40 0e e1 b8 f8 1c a0 a6
0d 1a 39 7a 10 28 bf f5
d2 ef 50 66 12 68 42 fb
8d a4 19 76 32 bd b5 4f
f6 63 3f 86 bb c8 36 e6
40 d4 d8 98
",
},
TestVector {
name: "TLS1.2 PRF-SHA384",
digest: MessageDigest::sha384,
secret: "b8 0b 73 3d 6c ee fc dc 71 56 6e a4 8e 55 67 df",
label: b"test label",
seed: "cd 66 5c f6 a8 44 7d d6 ff 8b 27 55 5e db 74 65",
expected: "
7b 0c 18 e9 ce d4 10 ed
18 04 f2 cf a3 4a 33 6a
1c 14 df fb 49 00 bb 5f
d7 94 21 07 e8 1c 83 cd
e9 ca 0f aa 60 be 9f e3
4f 82 b1 23 3c 91 46 a0
e5 34 cb 40 0f ed 27 00
88 4f 9d c2 36 f8 0e dd
8b fa 96 11 44 c9 e8 d7
92 ec a7 22 a7 b3 2f c3
d4 16 d4 73 eb c2 c5 fd
4a bf da d0 5d 91 84 25
9b 5b f8 cd 4d 90 fa 0d
31 e2 de c4 79 e4 f1 a2
60 66 f2 ee a9 a6 92 36
a3 e5 26 55 c9 e9 ae e6
91 c8 f3 a2 68 54 30 8d
5e aa 3b e8 5e 09 90 70
3d 73 e5 6f
",
},
];
for vector in vectors {
let secret = decode_hex(vector.secret);
let seed = decode_hex(vector.seed);
let expected = decode_hex(vector.expected);
let mut out = vec![0u8; expected.len()];
super::tls1_prf(
(vector.digest)(),
out.as_mut_slice(),
secret.as_slice(),
vector.label,
seed.as_slice(),
)
.unwrap();
assert_eq!(out, expected, "{}", vector.name);
}
}
fn decode_hex(input: &str) -> Vec<u8> {
let compact: String = input.chars().filter(|c| !c.is_whitespace()).collect();
Vec::from_hex(compact).unwrap()
}
}