SecTrustEvaluate() 是否在应用程序钥匙串中查找根证书？

文档说：“如果验证叶证书所需的所有证书均未包含在信任管理对象中，则 SecTrustEvaluate 会在钥匙串搜索列表（请参阅 SecTrustSetKeychains）和系统的锚证书存储中（请参阅 SecTrustSetAnchorCertificates）搜索证书”。

然而，由于 SecTrustSetKeychains() 在 iOS 上不可用，因此尚不清楚该函数是否也会在应用程序的钥匙串中查找。

看来你已经有一段时间没有发帖了，所以我不确定你是否还需要答案。如果您的用例是“我受到了打击connection:didReceiveAuthenticationChallenge:，我想确保exact正在评估证书，那么您可以使用 iOS 内置信任方法或通过 Foundation API 做更多工作：（请注意，此处并未专门调用 SecTrustEvaulate，但可以很容易地添加它）

#import <Security/Security.h>
#import <CommonCrypto/CommonDigest.h>

从那里，您可以迭代完整的证书数组，并将其与挑战服务器信任参考的 SHA1 之类的内容进行比较：

// way #1 - iOS built-in ================================================ //
SecTrustRef trust = challenge.protectionSpace.serverTrust;
CFIndex cnt = SecTrustGetCertificateCount(trust);

// way #2 - build it in yourself from a file ============================ //
OSErr err;
NSString *path = [[NSBundle mainBundle] pathForResource:@"my.cert" 
                                                 ofType:@"der"];
NSData *derData = [NSData dataWithContentsOfFile:path];

SecCertificateRef myCert = 
    SecCertificateCreateWithData(NULL, (CFDataRef)derData);

CFMutableArrayRef array = CFArrayCreateMutable(NULL, 1, NULL);
CFArrayInsertValueAtIndex(array, 0, myCert);

err = SecTrustSetAnchorCertificates(trust, array);
if (err != errSecSuccess) {
    // do something smarter here, obviously, logging would be a start
    abort();
}
CFArrayRef certs = NULL;
err = SecTrustCopyCustomAnchorCertificates(trust, &certs);
if (err != errSecSuccess) {
    // again, better choices needed
    abort();
}
CFIndex cnt = CFArrayGetCount(certs);

// loop and compare 'em
for (int i = 0; i < cnt; i++) {
    SecCertificateRef cert = SecTrustGetCertificateAtIndex(trust, i);

    CFDataRef cdata = SecCertificateCopyData(cert);
    NSData *data = [[NSData alloc] initWithData:(NSData *)cdata];

    unsigned char digest_result[CC_SHA1_DIGEST_LENGTH];

    CC_SHA1(data.bytes, data.length, digest_result);
    // compare each byte with your in-code SHA1 bytes
    if (allBytesMatch) {
        NSURLCredential *cred = [NSURLCredential credentialForTrust:trust];
        [challenge.sender useCredential:cred 
             forAuthenticationChallenge:challenge];
    }
}
// don't forget to release & CFRelease all the alloc'ed stuff from above