我正在尝试NSURLCredential使用该+credentialWithIdentity:certificates:persistence:方法创建一个。但是它返回零。
我已经完成了以下步骤。首先，我创建了一个私钥和公钥，然后生成了一个证书并将其添加到我的钥匙串中。第一个问题，当我这样做时：
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 mycertificateTag是一个无效参数。如果我不放这个标签，我可以把证书放在我的钥匙串上，然后在方法里面
(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
我放
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];
我得到了正确的身份和证书，但凭证一直没有返回任何内容，不是错误，只是空值。知道为什么吗？