1 /*
2 * FIPS 186-2 PRF for libcrypto
3 * Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10 #include <openssl/opensslv.h>
11
12 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
13
14 /* OpenSSL 3.0 has deprecated the low-level SHA1 functions and does not
15 * include an upper layer interface that could be used to use the
16 * SHA1_Transform() function. Use the internal SHA-1 implementation instead
17 * as a workaround. */
18 #include "sha1-internal.c"
19 #include "fips_prf_internal.c"
20
21 #else /* OpenSSL version >= 3.0 */
22
23 #include <openssl/sha.h>
24
25 #include "common.h"
26 #include "crypto.h"
27
28
sha1_transform(u32 * state,const u8 data[64])29 static void sha1_transform(u32 *state, const u8 data[64])
30 {
31 SHA_CTX context;
32 os_memset(&context, 0, sizeof(context));
33 #if defined(OPENSSL_IS_BORINGSSL) && !defined(ANDROID)
34 context.h[0] = state[0];
35 context.h[1] = state[1];
36 context.h[2] = state[2];
37 context.h[3] = state[3];
38 context.h[4] = state[4];
39 SHA1_Transform(&context, data);
40 state[0] = context.h[0];
41 state[1] = context.h[1];
42 state[2] = context.h[2];
43 state[3] = context.h[3];
44 state[4] = context.h[4];
45 #else
46 context.h0 = state[0];
47 context.h1 = state[1];
48 context.h2 = state[2];
49 context.h3 = state[3];
50 context.h4 = state[4];
51 SHA1_Transform(&context, data);
52 state[0] = context.h0;
53 state[1] = context.h1;
54 state[2] = context.h2;
55 state[3] = context.h3;
56 state[4] = context.h4;
57 #endif
58 }
59
60
fips186_2_prf(const u8 * seed,size_t seed_len,u8 * x,size_t xlen)61 int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
62 {
63 u8 xkey[64];
64 u32 t[5], _t[5];
65 int i, j, m, k;
66 u8 *xpos = x;
67 u32 carry;
68
69 if (seed_len < sizeof(xkey))
70 os_memset(xkey + seed_len, 0, sizeof(xkey) - seed_len);
71 else
72 seed_len = sizeof(xkey);
73
74 /* FIPS 186-2 + change notice 1 */
75
76 os_memcpy(xkey, seed, seed_len);
77 t[0] = 0x67452301;
78 t[1] = 0xEFCDAB89;
79 t[2] = 0x98BADCFE;
80 t[3] = 0x10325476;
81 t[4] = 0xC3D2E1F0;
82
83 m = xlen / 40;
84 for (j = 0; j < m; j++) {
85 /* XSEED_j = 0 */
86 for (i = 0; i < 2; i++) {
87 /* XVAL = (XKEY + XSEED_j) mod 2^b */
88
89 /* w_i = G(t, XVAL) */
90 os_memcpy(_t, t, 20);
91 sha1_transform(_t, xkey);
92 WPA_PUT_BE32(xpos, _t[0]);
93 WPA_PUT_BE32(xpos + 4, _t[1]);
94 WPA_PUT_BE32(xpos + 8, _t[2]);
95 WPA_PUT_BE32(xpos + 12, _t[3]);
96 WPA_PUT_BE32(xpos + 16, _t[4]);
97
98 /* XKEY = (1 + XKEY + w_i) mod 2^b */
99 carry = 1;
100 for (k = 19; k >= 0; k--) {
101 carry += xkey[k] + xpos[k];
102 xkey[k] = carry & 0xff;
103 carry >>= 8;
104 }
105
106 xpos += 20;
107 }
108 /* x_j = w_0|w_1 */
109 }
110
111 return 0;
112 }
113
114 #endif /* OpenSSL version >= 3.0 */
115