Use the USE_NSS macro to help porting to FreeBSD, OpenBSD, etc....

net/http/des.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/des.h"
 
-#if defined(OS_LINUX)
+#if defined(USE_NSS)
 #include <nss.h>
 #include <pk11pub.h>
 #elif defined(OS_MACOSX)
 #include <CommonCrypto/CommonCryptor.h>
 #elif defined(OS_WIN)
 #include <windows.h>
 #include <wincrypt.h>
 #endif
 
 #include "base/logging.h"
-#if defined(OS_LINUX)
+#if defined(USE_NSS)
 #include "base/nss_util.h"
 #endif
 
 // The Mac and Windows (CryptoAPI) versions of DESEncrypt are our own code.
 // DESSetKeyParity, DESMakeKey, and the Linux (NSS) version of DESEncrypt are
 // based on mozilla/security/manager/ssl/src/nsNTLMAuthModule.cpp,
 // CVS rev. 1.14.
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
@@ skipping 49 matching lines @@
   key[0] = DESSetKeyParity(raw[0]);
   key[1] = DESSetKeyParity((raw[0] << 7) | (raw[1] >> 1));
   key[2] = DESSetKeyParity((raw[1] << 6) | (raw[2] >> 2));
   key[3] = DESSetKeyParity((raw[2] << 5) | (raw[3] >> 3));
   key[4] = DESSetKeyParity((raw[3] << 4) | (raw[4] >> 4));
   key[5] = DESSetKeyParity((raw[4] << 3) | (raw[5] >> 5));
   key[6] = DESSetKeyParity((raw[5] << 2) | (raw[6] >> 6));
   key[7] = DESSetKeyParity((raw[6] << 1));
 }
 
-#if defined(OS_LINUX)
+#if defined(USE_NSS)
 
 void DESEncrypt(const uint8* key, const uint8* src, uint8* hash) {
   CK_MECHANISM_TYPE cipher_mech = CKM_DES_ECB;
   PK11SlotInfo* slot = NULL;
   PK11SymKey* symkey = NULL;
   PK11Context* ctxt = NULL;
   SECItem key_item;
   SECItem* param = NULL;
   SECStatus rv;
   unsigned int n;
@@ skipping 112 matching lines @@
  done:
   if (hkey)
     CryptDestroyKey(hkey);
   if (provider)
     CryptReleaseContext(provider, 0);
 }
 
 #endif
 
 }  // namespace net