18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * FIPS 186-2 PRF for internal crypto implementation 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 5c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 6c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "sha1.h" 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "sha1_i.h" 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto.h" 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen) 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 xkey[64]; 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 t[5], _t[5]; 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int i, j, m, k; 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 *xpos = x; 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u32 carry; 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 251f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt if (seed_len < sizeof(xkey)) 261f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt os_memset(xkey + seed_len, 0, sizeof(xkey) - seed_len); 271f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt else 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt seed_len = sizeof(xkey); 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* FIPS 186-2 + change notice 1 */ 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(xkey, seed, seed_len); 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt t[0] = 0x67452301; 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt t[1] = 0xEFCDAB89; 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt t[2] = 0x98BADCFE; 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt t[3] = 0x10325476; 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt t[4] = 0xC3D2E1F0; 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt m = xlen / 40; 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (j = 0; j < m; j++) { 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* XSEED_j = 0 */ 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < 2; i++) { 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* XVAL = (XKEY + XSEED_j) mod 2^b */ 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* w_i = G(t, XVAL) */ 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(_t, t, 20); 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt SHA1Transform(_t, xkey); 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _t[0] = host_to_be32(_t[0]); 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _t[1] = host_to_be32(_t[1]); 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _t[2] = host_to_be32(_t[2]); 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _t[3] = host_to_be32(_t[3]); 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt _t[4] = host_to_be32(_t[4]); 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(xpos, _t, 20); 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* XKEY = (1 + XKEY + w_i) mod 2^b */ 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt carry = 1; 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (k = 19; k >= 0; k--) { 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt carry += xkey[k] + xpos[k]; 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt xkey[k] = carry & 0xff; 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt carry >>= 8; 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt xpos += SHA1_MAC_LEN; 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* x_j = w_0|w_1 */ 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return 0; 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 70