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    copied!<p>Certificate information can be obtained using NSURLConnection delegate methods:</p> <pre><code>- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge </code></pre> <p>That is:</p> <pre><code>- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace { BOOL result = [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]; NSLog(@"&lt;%p %@: %s line:%d&gt; Result:%s", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__, (result == YES) ? "YES" : "NO"); return result; } - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { NSArray *trustedHosts = [NSArray arrayWithObject:@"encrypted.google.com"]; BOOL isAuthMethodServerTrust = [challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]; NSLog(@"&lt;%p %@: %s line:%d&gt; Result:%s", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__, (isAuthMethodServerTrust == YES) ? "YES" : "NO"); if (isAuthMethodServerTrust) { if ([trustedHosts containsObject:challenge.protectionSpace.host]) { NSLog(@"&lt;%p %@: %s line:%d&gt; trustedHosts containsObject:challenge.protectionSpace.host", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__); NSURLCredential* urlCredential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]; NSLog(@"&lt;%p %@: %s line:%d&gt; Url credential", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__); [challenge.sender useCredential:urlCredential forAuthenticationChallenge:challenge]; //Code to verify certificate info SecTrustRef trustRef = [[challenge protectionSpace] serverTrust]; CFIndex count = SecTrustGetCertificateCount(trustRef); for (CFIndex i = 0; i &lt; count; i++) { SecCertificateRef certRef = SecTrustGetCertificateAtIndex(trustRef, i); CFStringRef certSummary = SecCertificateCopySubjectSummary(certRef); CFDataRef certData = SecCertificateCopyData(certRef); NSLog(@"&lt;%p %@: %s line:%d&gt; Certificate summary:%@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__, (NSString*) certSummary); NSLog(@"&lt;%p %@: %s line:%d&gt; Certificate data:%@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __PRETTY_FUNCTION__, __LINE__, (NSString*) certData); CFRelease(certData); } } } } </code></pre> <p>This code gives you the following information related to "https://encrypted.google.com": In the "certSummary" NSString the issuer of the certificate. In the "certData" data of the certificate. The problem is that at present I do not know how extract information from a such data (expiration date, public key, ...), so any help will be welcomed.</p>
 

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