我等不及赏金的答案，所以我自己找到了解决方案。正如其他人所说，Security.framework 没有为您提供获取此信息的方法，因此您需要要求 OpenSSL 为您解析证书数据：
#import <openssl/x509.h>
// ...
NSData *certificateData = (NSData *) SecCertificateCopyData(certificate);
const unsigned char *certificateDataBytes = (const unsigned char *)[certificateData bytes];
X509 *certificateX509 = d2i_X509(NULL, &certificateDataBytes, [certificateData length]);
NSString *issuer = CertificateGetIssuerName(certificateX509);
NSDate *expiryDate = CertificateGetExpiryDate(certificateX509);
Where CertificateGetIssuerName and CertificateGetExpiryDate如下面所述：
static NSString * CertificateGetIssuerName(X509 *certificateX509)
{
NSString *issuer = nil;
if (certificateX509 != NULL) {
X509_NAME *issuerX509Name = X509_get_issuer_name(certificateX509);
if (issuerX509Name != NULL) {
int nid = OBJ_txt2nid("O"); // organization
int index = X509_NAME_get_index_by_NID(issuerX509Name, nid, -1);
X509_NAME_ENTRY *issuerNameEntry = X509_NAME_get_entry(issuerX509Name, index);
if (issuerNameEntry) {
ASN1_STRING *issuerNameASN1 = X509_NAME_ENTRY_get_data(issuerNameEntry);
if (issuerNameASN1 != NULL) {
unsigned char *issuerName = ASN1_STRING_data(issuerNameASN1);
issuer = [NSString stringWithUTF8String:(char *)issuerName];
}
}
}
}
return issuer;
}
static NSDate *CertificateGetExpiryDate(X509 *certificateX509)
{
NSDate *expiryDate = nil;
if (certificateX509 != NULL) {
ASN1_TIME *certificateExpiryASN1 = X509_get_notAfter(certificateX509);
if (certificateExpiryASN1 != NULL) {
ASN1_GENERALIZEDTIME *certificateExpiryASN1Generalized = ASN1_TIME_to_generalizedtime(certificateExpiryASN1, NULL);
if (certificateExpiryASN1Generalized != NULL) {
unsigned char *certificateExpiryData = ASN1_STRING_data(certificateExpiryASN1Generalized);
// ASN1 generalized times look like this: "20131114230046Z"
// format: YYYYMMDDHHMMSS
// indices: 01234567890123
// 1111
// There are other formats (e.g. specifying partial seconds or
// time zones) but this is good enough for our purposes since
// we only use the date and not the time.
//
// (Source: http://www.obj-sys.com/asn1tutorial/node14.html)
NSString *expiryTimeStr = [NSString stringWithUTF8String:(char *)certificateExpiryData];
NSDateComponents *expiryDateComponents = [[NSDateComponents alloc] init];
expiryDateComponents.year = [[expiryTimeStr substringWithRange:NSMakeRange(0, 4)] intValue];
expiryDateComponents.month = [[expiryTimeStr substringWithRange:NSMakeRange(4, 2)] intValue];
expiryDateComponents.day = [[expiryTimeStr substringWithRange:NSMakeRange(6, 2)] intValue];
expiryDateComponents.hour = [[expiryTimeStr substringWithRange:NSMakeRange(8, 2)] intValue];
expiryDateComponents.minute = [[expiryTimeStr substringWithRange:NSMakeRange(10, 2)] intValue];
expiryDateComponents.second = [[expiryTimeStr substringWithRange:NSMakeRange(12, 2)] intValue];
NSCalendar *calendar = [NSCalendar currentCalendar];
expiryDate = [calendar dateFromComponents:expiryDateComponents];
[expiryDateComponents release];
}
}
}
return expiryDate;
}
出于我的目的，我实际上只需要发行人的组织名称和到期日期，这就是我在下面包含的所有代码。但是，基于此，您应该能够通过阅读以下内容来弄清楚其余的内容x509.h头文件。
Edit:
以下是如何获取证书。我没有进行任何错误处理等。你需要检查一下trustResult, err等等，例如。
NSURLAuthenticationChallenge *challenge;
SecTrustResultType trustResult;
SecTrustRef trust = challenge.protectionSpace.serverTrust;
OSStatus err = SecTrustEvaluate(trust, &trustResult);
SecCertificateRef certificate = SecGetLeafCertificate(trust); // See Apple docs for implementation of SecGetLeafCertificate
