workbench/network/WirelessManager/src/crypto/md5-non-fips.c

   1 /*
   2  * MD5 hash implementation and interface functions (non-FIPS allowed cases)
   3  * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "md5.h"
  19 #include "crypto.h"
  20
  21
  22 /**
  23  * hmac_md5_vector_non_fips_allow - HMAC-MD5 over data vector (RFC 2104)
  24  * @key: Key for HMAC operations
  25  * @key_len: Length of the key in bytes
  26  * @num_elem: Number of elements in the data vector
  27  * @addr: Pointers to the data areas
  28  * @len: Lengths of the data blocks
  29  * @mac: Buffer for the hash (16 bytes)
  30  * Returns: 0 on success, -1 on failure
  31  */
  32 int hmac_md5_vector_non_fips_allow(const u8 *key, size_t key_len,
  33                                    size_t num_elem, const u8 *addr[],
  34                                    const size_t *len, u8 *mac)
  35 {
  36         u8 k_pad[64]; /* padding - key XORd with ipad/opad */
  37         u8 tk[16];
  38         const u8 *_addr[6];
  39         size_t i, _len[6];
  40
  41         if (num_elem > 5) {
  42                 /*
  43                  * Fixed limit on the number of fragments to avoid having to
  44                  * allocate memory (which could fail).
  45                  */
  46                 return -1;
  47         }
  48
  49         /* if key is longer than 64 bytes reset it to key = MD5(key) */
  50         if (key_len > 64) {
  51                 if (md5_vector_non_fips_allow(1, &key, &key_len, tk))
  52                         return -1;
  53                 key = tk;
  54                 key_len = 16;
  55         }
  56
  57         /* the HMAC_MD5 transform looks like:
  58          *
  59          * MD5(K XOR opad, MD5(K XOR ipad, text))
  60          *
  61          * where K is an n byte key
  62          * ipad is the byte 0x36 repeated 64 times
  63          * opad is the byte 0x5c repeated 64 times
  64          * and text is the data being protected */
  65
  66         /* start out by storing key in ipad */
  67         os_memset(k_pad, 0, sizeof(k_pad));
  68         os_memcpy(k_pad, key, key_len);
  69
  70         /* XOR key with ipad values */
  71         for (i = 0; i < 64; i++)
  72                 k_pad[i] ^= 0x36;
  73
  74         /* perform inner MD5 */
  75         _addr[0] = k_pad;
  76         _len[0] = 64;
  77         for (i = 0; i < num_elem; i++) {
  78                 _addr[i + 1] = addr[i];
  79                 _len[i + 1] = len[i];
  80         }
  81         if (md5_vector_non_fips_allow(1 + num_elem, _addr, _len, mac))
  82                 return -1;
  83
  84         os_memset(k_pad, 0, sizeof(k_pad));
  85         os_memcpy(k_pad, key, key_len);
  86         /* XOR key with opad values */
  87         for (i = 0; i < 64; i++)
  88                 k_pad[i] ^= 0x5c;
  89
  90         /* perform outer MD5 */
  91         _addr[0] = k_pad;
  92         _len[0] = 64;
  93         _addr[1] = mac;
  94         _len[1] = MD5_MAC_LEN;
  95         return md5_vector_non_fips_allow(2, _addr, _len, mac);
  96 }
  97
  98
  99 /**
 100  * hmac_md5_non_fips_allow - HMAC-MD5 over data buffer (RFC 2104)
 101  * @key: Key for HMAC operations
 102  * @key_len: Length of the key in bytes
 103  * @data: Pointers to the data area
 104  * @data_len: Length of the data area
 105  * @mac: Buffer for the hash (16 bytes)
 106  * Returns: 0 on success, -1 on failure
 107  */
 108 int hmac_md5_non_fips_allow(const u8 *key, size_t key_len, const u8 *data,
 109                             size_t data_len, u8 *mac)
 110 {
 111         return hmac_md5_vector_non_fips_allow(key, key_len, 1, &data,
 112                                               &data_len, mac);
 113 }