The Tor Browser: security/nss/lib/util/secplcy.c@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "secplcy.h"

     6 #include "prmem.h"

     8 SECCipherFind *sec_CipherFindInit(PRBool onlyAllowed,

     9 				  secCPStruct *policy,

    10 				  long *ciphers)

    11 {

    12   SECCipherFind *find = PR_NEWZAP(SECCipherFind);

    13   if (find)

    14     {

    15       find->policy = policy;

    16       find->ciphers = ciphers;

    17       find->onlyAllowed = onlyAllowed;

    18       find->index = -1;

    19     }

    20   return find;

    21 }

    23 long sec_CipherFindNext(SECCipherFind *find)

    24 {

    25   char *policy;

    26   long rv = -1;

    27   secCPStruct *policies = (secCPStruct *) find->policy;

    28   long *ciphers = (long *) find->ciphers;

    29   long numCiphers = policies->num_ciphers;

    31   find->index++;

    32   while((find->index < numCiphers) && (rv == -1))

    33     {

    34       /* Translate index to cipher. */

    35       rv = ciphers[find->index];

    37       /* If we're only looking for allowed ciphers, and if this

    38 	 cipher isn't allowed, loop around.*/

    39       if (find->onlyAllowed)

    40 	{

    41 	  /* Find the appropriate policy flag. */

    42 	  policy = (&(policies->begin_ciphers)) + find->index + 1;

    44 	  /* If this cipher isn't allowed by policy, continue. */

    45 	  if (! (*policy))

    46 	    {

    47 	      rv = -1;

    48 	      find->index++;

    49 	    }

    50 	}

    51     }

    53   return rv;

    54 }

    56 char sec_IsCipherAllowed(long cipher, secCPStruct *policies,

    57 			 long *ciphers)

    58 {

    59   char result = SEC_CIPHER_NOT_ALLOWED; /* our default answer */

    60   long numCiphers = policies->num_ciphers;

    61   char *policy;

    62   int i;

    64   /* Convert the cipher number into a policy flag location. */

    65   for (i=0, policy=(&(policies->begin_ciphers) + 1);

    66        i<numCiphers;

    67        i++, policy++)

    68     {

    69       if (cipher == ciphers[i])

    70 	break;

    71     }

    73   if (i < numCiphers)

    74     {

    75       /* Found the cipher, get the policy value. */

    76       result = *policy;

    77     }

    79   return result;

    80 }

    82 void sec_CipherFindEnd(SECCipherFind *find)

    83 {

    84   PR_FREEIF(find);

    85 }

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