LCOV - code coverage report
Current view: top level - src/crypto - fips_prf_openssl.c (source / functions) Hit Total Coverage
Test: wpa_supplicant/hostapd combined for hwsim test run 1475438200 Lines: 41 42 97.6 %
Date: 2016-10-02 Functions: 2 2 100.0 %

          Line data    Source code
       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/sha.h>
      11             : 
      12             : #include "common.h"
      13             : #include "crypto.h"
      14             : 
      15             : 
      16        2178 : static void sha1_transform(u32 *state, const u8 data[64])
      17             : {
      18             :         SHA_CTX context;
      19        2178 :         os_memset(&context, 0, sizeof(context));
      20             : #if defined(OPENSSL_IS_BORINGSSL) && !defined(ANDROID)
      21             :         context.h[0] = state[0];
      22             :         context.h[1] = state[1];
      23             :         context.h[2] = state[2];
      24             :         context.h[3] = state[3];
      25             :         context.h[4] = state[4];
      26             :         SHA1_Transform(&context, data);
      27             :         state[0] = context.h[0];
      28             :         state[1] = context.h[1];
      29             :         state[2] = context.h[2];
      30             :         state[3] = context.h[3];
      31             :         state[4] = context.h[4];
      32             : #else
      33        2178 :         context.h0 = state[0];
      34        2178 :         context.h1 = state[1];
      35        2178 :         context.h2 = state[2];
      36        2178 :         context.h3 = state[3];
      37        2178 :         context.h4 = state[4];
      38        2178 :         SHA1_Transform(&context, data);
      39        2178 :         state[0] = context.h0;
      40        2178 :         state[1] = context.h1;
      41        2178 :         state[2] = context.h2;
      42        2178 :         state[3] = context.h3;
      43        2178 :         state[4] = context.h4;
      44             : #endif
      45        2178 : }
      46             : 
      47             : 
      48         273 : int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
      49             : {
      50             :         u8 xkey[64];
      51             :         u32 t[5], _t[5];
      52             :         int i, j, m, k;
      53         273 :         u8 *xpos = x;
      54             :         u32 carry;
      55             : 
      56         273 :         if (seed_len < sizeof(xkey))
      57         273 :                 os_memset(xkey + seed_len, 0, sizeof(xkey) - seed_len);
      58             :         else
      59           0 :                 seed_len = sizeof(xkey);
      60             : 
      61             :         /* FIPS 186-2 + change notice 1 */
      62             : 
      63         273 :         os_memcpy(xkey, seed, seed_len);
      64         273 :         t[0] = 0x67452301;
      65         273 :         t[1] = 0xEFCDAB89;
      66         273 :         t[2] = 0x98BADCFE;
      67         273 :         t[3] = 0x10325476;
      68         273 :         t[4] = 0xC3D2E1F0;
      69             : 
      70         273 :         m = xlen / 40;
      71        1362 :         for (j = 0; j < m; j++) {
      72             :                 /* XSEED_j = 0 */
      73        3267 :                 for (i = 0; i < 2; i++) {
      74             :                         /* XVAL = (XKEY + XSEED_j) mod 2^b */
      75             : 
      76             :                         /* w_i = G(t, XVAL) */
      77        2178 :                         os_memcpy(_t, t, 20);
      78        2178 :                         sha1_transform(_t, xkey);
      79        2178 :                         WPA_PUT_BE32(xpos, _t[0]);
      80        2178 :                         WPA_PUT_BE32(xpos + 4, _t[1]);
      81        2178 :                         WPA_PUT_BE32(xpos + 8, _t[2]);
      82        2178 :                         WPA_PUT_BE32(xpos + 12, _t[3]);
      83        2178 :                         WPA_PUT_BE32(xpos + 16, _t[4]);
      84             : 
      85             :                         /* XKEY = (1 + XKEY + w_i) mod 2^b */
      86        2178 :                         carry = 1;
      87       45738 :                         for (k = 19; k >= 0; k--) {
      88       43560 :                                 carry += xkey[k] + xpos[k];
      89       43560 :                                 xkey[k] = carry & 0xff;
      90       43560 :                                 carry >>= 8;
      91             :                         }
      92             : 
      93        2178 :                         xpos += 20;
      94             :                 }
      95             :                 /* x_j = w_0|w_1 */
      96             :         }
      97             : 
      98         273 :         return 0;
      99             : }

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