返回空的NSURLCredential创建

Question

我正在尝试使用NSURLCredential方法创建+credentialWithIdentity:certificates:persistence:。不管怎么回事都是零。

我已经完成了以下步骤。首先创建一个私钥和公钥，然后生成一个证书并将其添加到我的密钥链中。第一个问题，当我这么做的时候：

static const uint8_t certificateIdentifier[] = "test.certificate";    
NSData * certificateTag = [NSData dataWithBytes:certificateIdentifier length:sizeof(certificateIdentifier)];
SecCertificateRef cert = SecCertificateCreateWithData(NULL, (__bridge CFDataRef) certificadoData);
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setObject:(__bridge id)kSecClassCertificate forKey:(__bridge id)kSecClass];
[dictionary setObject:certificateTag forKey:(__bridge id)kSecAttrApplicationTag];
[dictionary setObject:(__bridge id)(cert) forKey:(__bridge id<NSCopying>)(kSecValueRef)];
OSStatus status = SecItemAdd((__bridge CFDictionaryRef)dictionary, NULL);

状态告诉我，我的certificateTag是一个无效的参数。如果我不放置这个标签，并且我可以将证书放在我的密钥链上，那么在方法中

(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge

我把

SecIdentityRef myIdentity;
SecCertificateRef myCertificate;

NSMutableDictionary * queryCertificate = [[NSMutableDictionary alloc] init];
[queryCertificate setObject:(__bridge id)kSecClassIdentity forKey:(__bridge id)kSecClass];
[queryCertificate setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];

OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)queryCertificate, (CFTypeRef *)&myIdentity);

status = SecIdentityCopyCertificate(myIdentity, &myCertificate);

const void *certs[] = { myCertificate };
CFArrayRef certsArray = CFArrayCreate(NULL, certs, 1, NULL);
NSURLCredential *credential = [NSURLCredential credentialWithIdentity:myIdentity certificates:(__bridge NSArray*)certsArray persistence:NSURLCredentialPersistencePermanent];

[[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];

我获得了身份和证书的权利，但是凭据一直没有返回任何信息，没有错误，只有null。知道为什么吗？

Answer 1

在我问题的第一部分，我试图在一个kSecAttrApplicationTag中添加一个kSecClassCertificate，但是kSecAttrApplicationTag只在kSecClassKey中被接受。

在第二部分中，凭据(<NSURLCredential: 0x1e20d140>: (null))的结果是正确的，这个" null“并不意味着这个值实际上是空的。保持这种方式我的代码工作正常。