获取SSL证书详细信息

Question

我想检查-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge收到的SSL证书,我有以下代码片段,它给出了Issuer Common Name和DER.

SecTrustRef trustRef = [[challenge protectionSpace] serverTrust];
SecTrustEvaluate(trustRef, NULL);
CFIndex count = SecTrustGetCertificateCount(trustRef); 

for (CFIndex i = 0; i < count; i++)
{
    SecCertificateRef certRef = SecTrustGetCertificateAtIndex(trustRef, i);
    CFStringRef certSummary = SecCertificateCopySubjectSummary(certRef);
    CFDataRef certData = SecCertificateCopyData(certRef);
}

另外我想得到指纹和签名.我的SSL知识并不那么深刻; 我可以从DER表示中提取上述内容吗？

文档没有帮助.http://developer.apple.com/library/ios/#documentation/Security/Reference/certifkeytrustservices/Reference/reference.html.

Answer 1

你可以像这样获得sha1指纹.

// #import <CommonCrypto/CommonDigest.h>
+(NSString*)sha1:(NSData*)certData {
    unsigned char sha1Buffer[CC_SHA1_DIGEST_LENGTH]; 
    CC_SHA1(certData.bytes, certData.length, sha1Buffer); 
    NSMutableString *fingerprint = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 3]; 
    for (int i = 0; i < CC_SHA1_DIGEST_LENGTH; ++i) 
        [fingerprint appendFormat:@"%02x ",sha1Buffer[i]]; 
    return [fingerprint stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; 
}

可以以类似的方式获得md5指纹.以这种方式获得的sha1和md5哈希值与Safari和Chrome显示的指纹匹配,以获得不受信任的证书.