edisonlo

- (IBAction)ecdsaAction:(id)sender {
    
    
    
    NSData *privateKeyPEMData = [[NSFileManager defaultManager] contentsAtPath: [[NSBundle mainBundle] pathForResource:@"ec_private_key" ofType:@"p12"  ]];
    if(privateKeyPEMData){
        NSLog(@"privateKeyPEMData NOT NULL");
        SecKeyRef privateKey = [self getPrivateKeyRefrenceFromData:privateKeyPEMData password:@"12345678"];
        if(privateKey){
            NSLog(@"private key is NOT NULL!!");

edisonlo

- (SecKeyRef)getPublicKeyFromCertificate:(NSData *)data
{
    //create certificate.
    CFDataRef dataRef=CFDataCreate(kCFAllocatorDefault, [data bytes], (CFIndex)[data length]);
    SecCertificateRef certiRef=SecCertificateCreateWithData(kCFAllocatorDefault, dataRef);
    (CFRelease(dataRef));
    //evaluate certificate.
    CFArrayRef certs = CFArrayCreate(kCFAllocatorDefault, (const void **) &certiRef, 1, NULL);
    SecPolicyRef policy = SecPolicyCreateBasicX509();
    SecTrustRef trust;

edisonlo

- (SecKeyRef)getPublicKeyRefrenceFromeData:    (NSData*)derData {
    
    SecCertificateRef myCertificate = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)derData);
    SecPolicyRef myPolicy = SecPolicyCreateBasicX509();
    SecTrustRef myTrust;
    OSStatus status = SecTrustCreateWithCertificates(myCertificate,myPolicy,&myTrust);
    SecTrustResultType trustResult;
    if (status == noErr) {
        status = SecTrustEvaluate(myTrust, &trustResult);
    }

edisonlo

- (SecKeyRef)getPrivateKeyRefrenceFromData:(NSData*)p12Data password:(NSString*)password {
    
    SecKeyRef privateKeyRef = NULL;
    NSMutableDictionary * options = [[NSMutableDictionary alloc] init];
    [options setObject: password forKey:(__bridge id)kSecImportExportPassphrase];
    CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
    OSStatus securityError = SecPKCS12Import((__bridge CFDataRef) p12Data, (__bridge CFDictionaryRef)options, &items);
    if (securityError == noErr && CFArrayGetCount(items) > 0) {
        CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);
        SecIdentityRef identityApp = (SecIdentityRef)CFDictionaryGetValue(identityDict, kSecImportItemIdentity);

edisonlo

        let myFormatter = DateFormatter()
        myFormatter.timeZone = TimeZone(identifier: "Asia/Hong_Kong")!
        myFormatter.dateFormat = "Y-MM-dd HH:mm:ss Z"
    
        if let theDay = myFormatter.date(from: "2017-09-26 16:20:00 -0700"){
            // It is tricky if u print the date(it will use +0000)
            print("theDay: \(theDay)")
            let hkCalendar = Calendar.current
            let dateCompoents = hkCalendar.dateComponents([.year, .month, .day, .hour, .minute, .timeZone, .calendar,.weekday], from: theDay)
            print("hour: \(dateCompoents.hour!)") //7