keychain/ot/SFECPublicKey+SPKI.m

   1 /*
   2  * Copyright (c) 2017 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 #if OCTAGON
  25
  26 #import "SFPublicKey+SPKI.h"
  27
  28 #import <Security/SecKeyPriv.h>
  29 #import <SecurityFoundation/SFKey_Private.h>
  30
  31 @implementation SFECPublicKey (OTSubjectPublicKeyInfo)
  32
  33 - (NSData *)asSPKI
  34 {
  35     NSDictionary *keyAttributes = @{
  36                                     (__bridge id)kSecAttrKeyClass : (__bridge id)kSecAttrKeyClassPublic,
  37                                     (__bridge id)kSecAttrKeyType : (__bridge id)kSecAttrKeyTypeEC,
  38                                     };
  39     SecKeyRef seckey = SecKeyCreateWithData((__bridge CFDataRef)self.keyData, (__bridge CFDictionaryRef)keyAttributes, NULL);
  40     NSData *spki = CFBridgingRelease(SecKeyCopySubjectPublicKeyInfo(seckey));
  41     CFRelease(seckey);
  42     return spki;
  43 }
  44
  45 + (instancetype)fromSPKI:(NSData *)spki
  46 {
  47     SecKeyRef seckey = SecKeyCreateFromSubjectPublicKeyInfoData(NULL, (__bridge CFDataRef)spki);
  48     return [[SFECPublicKey alloc] initWithSecKey:seckey];
  49 }
  50
  51 @end
  52
  53 #endif