keychain/SecureObjectSync/SOSKeyedPubKeyIdentifier.c

   1 /*
   2  * Copyright (c) 2016 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //
  25 //  SOSKeyedPubKeyIdentifier.c
  26 //  Security
  27 //
  28
  29 #include "SOSKeyedPubKeyIdentifier.h"
  30 #include "AssertMacros.h"
  31 #include "keychain/SecureObjectSync/SOSInternal.h"
  32 #include <utilities/debugging.h>
  33
  34 #define SEPARATOR CFSTR("-")
  35 #define SEPLOC 2
  36
  37 bool SOSKeyedPubKeyIdentifierIsPrefixed(CFStringRef kpkid) {
  38     CFRange seploc = CFStringFind(kpkid, SEPARATOR, 0);
  39     return seploc.location == SEPLOC;
  40 }
  41
  42 static CFStringRef SOSKeyedPubKeyIdentifierCreateWithPrefixAndID(CFStringRef prefix, CFStringRef id) {
  43     CFMutableStringRef retval = NULL;
  44     require_quiet(prefix, errOut);
  45     require_quiet(id, errOut);
  46     require_quiet(CFStringGetLength(prefix) == SEPLOC, errOut);
  47     retval = CFStringCreateMutableCopy(kCFAllocatorDefault, 50, prefix);
  48     CFStringAppend(retval, SEPARATOR);
  49     CFStringAppend(retval, id);
  50 errOut:
  51     return retval;
  52 }
  53
  54 CFStringRef SOSKeyedPubKeyIdentifierCreateWithData(CFStringRef prefix, CFDataRef pubKeyData) {
  55     CFErrorRef localError = NULL;
  56     CFStringRef id = SOSCopyIDOfDataBuffer(pubKeyData, &localError);
  57     CFStringRef retval = SOSKeyedPubKeyIdentifierCreateWithPrefixAndID(prefix, id);
  58     if(!id) secnotice("kpid", "Couldn't create kpid: %@", localError);
  59     CFReleaseNull(id);
  60     CFReleaseNull(localError);
  61     return retval;
  62 }
  63
  64 CFStringRef SOSKeyedPubKeyIdentifierCreateWithSecKey(CFStringRef prefix, SecKeyRef pubKey) {
  65     CFErrorRef localError = NULL;
  66     CFStringRef id = SOSCopyIDOfKey(pubKey, &localError);
  67     CFStringRef retval = SOSKeyedPubKeyIdentifierCreateWithPrefixAndID(prefix, id);
  68     if(!id) secnotice("kpid", "Couldn't create kpid: %@", localError);
  69     CFReleaseNull(id);
  70     CFReleaseNull(localError);
  71     return retval;
  72 }
  73
  74
  75 CFStringRef SOSKeyedPubKeyIdentifierCopyPrefix(CFStringRef kpkid) {
  76     CFRange seploc = CFStringFind(kpkid, SEPARATOR, 0);
  77     if(seploc.location != SEPLOC) return NULL;
  78     CFRange prefloc = CFRangeMake(0, SEPLOC);
  79     return CFStringCreateWithSubstring(kCFAllocatorDefault, kpkid, prefloc);;
  80 }
  81
  82 CFStringRef SOSKeyedPubKeyIdentifierCopyHpub(CFStringRef kpkid) {
  83     CFRange seploc = CFStringFind(kpkid, SEPARATOR, 0);
  84     if(seploc.location != SEPLOC) return NULL;
  85     CFRange idloc = CFRangeMake(seploc.location+1, CFStringGetLength(kpkid) - (SEPLOC+1));
  86     return CFStringCreateWithSubstring(kCFAllocatorDefault, kpkid, idloc);;
  87 }
  88