Poniższy kod pochodzi z CryptoExercise przykład Apple, w SecKeyWrapper.m. Zakłada on, że obiekt NSData "publicKey" jest binarnym obiektem ASN.1 kodowanym przez DER, a nie kodowanym base-64. Więc musisz zdobyć dekoder base-64 i zastosować go najpierw. Możesz również przeczytać this post na forach programistów Apple.
- (SecKeyRef)addPeerPublicKey:(NSString *)peerName keyBits:(NSData *)publicKey {
OSStatus sanityCheck = noErr;
SecKeyRef peerKeyRef = NULL;
CFTypeRef persistPeer = NULL;
LOGGING_FACILITY(peerName != nil, @"Peer name parameter is nil.");
LOGGING_FACILITY(publicKey != nil, @"Public key parameter is nil.");
NSData * peerTag = [[NSData alloc] initWithBytes:(const void *)[peerName UTF8String] length:[peerName length]];
NSMutableDictionary * peerPublicKeyAttr = [[NSMutableDictionary alloc] init];
[peerPublicKeyAttr setObject:(id)kSecClassKey forKey:(id)kSecClass];
[peerPublicKeyAttr setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType];
[peerPublicKeyAttr setObject:peerTag forKey:(id)kSecAttrApplicationTag];
[peerPublicKeyAttr setObject:publicKey forKey:(id)kSecValueData];
[peerPublicKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnPersistentRef];
sanityCheck = SecItemAdd((CFDictionaryRef) peerPublicKeyAttr, (CFTypeRef *)&persistPeer);
// The nice thing about persistent references is that you can write their value out to disk and
// then use them later. I don't do that here but it certainly can make sense for other situations
// where you don't want to have to keep building up dictionaries of attributes to get a reference.
//
// Also take a look at SecKeyWrapper's methods (CFTypeRef)getPersistentKeyRefWithKeyRef:(SecKeyRef)key
// & (SecKeyRef)getKeyRefWithPersistentKeyRef:(CFTypeRef)persistentRef.
LOGGING_FACILITY1(sanityCheck == noErr || sanityCheck == errSecDuplicateItem, @"Problem adding the peer public key to the keychain, OSStatus == %d.", sanityCheck);
if (persistPeer) {
peerKeyRef = [self getKeyRefWithPersistentKeyRef:persistPeer];
} else {
[peerPublicKeyAttr removeObjectForKey:(id)kSecValueData];
[peerPublicKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnRef];
// Let's retry a different way.
sanityCheck = SecItemCopyMatching((CFDictionaryRef) peerPublicKeyAttr, (CFTypeRef *)&peerKeyRef);
}
LOGGING_FACILITY1(sanityCheck == noErr && peerKeyRef != NULL, @"Problem acquiring reference to the public key, OSStatus == %d.", sanityCheck);
[peerTag release];
[peerPublicKeyAttr release];
if (persistPeer) CFRelease(persistPeer);
return peerKeyRef;
}
@bs nadzieję ten link pomoże u http://blog.wingsofhermes.org/?p = 75 – 012346