来自 NSString 的 iOS SecKeyRef

Question

我需要使用公钥将用户密码加密为 base64 字符串。

公钥是一个 NSString。

是这样的:

"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCgWO7p1AvCaHUeaM6rSczBBAqt mKObHxGW3VgTom2zGwswGj9t/Hr7NdJQCGAiq0ijcW9/oYnM/JobbsyEijHKqIQm OVMsV4JRoG68PEDszH/ebkqWhzu7vG9IQ6VYIkaKHqk7cg+mQ1qFDoigOooFJ2Pf Uzbmg+Z/DuYDuwg+bwIDAQBC"

如何从中创建 SecKeyRef？

我找到了教程here

但我无法让它工作，因为 SecCertificateCreateWithData 总是返回 nil。

这是我的代码

NSData* data = [NSString base64DataFromString:PUBLIC_KEY];
SecCertificateRef   cert    = NULL;
SecPolicyRef        policy  = NULL;

cert = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)(data));
policy = SecPolicyCreateBasicX509();

OSStatus        status      = noErr;
SecKeyRef       *publicKey  = NULL;
SecTrustRef     trust       = NULL;
SecTrustResultType  trustType   = kSecTrustResultInvalid;

if (cert != NULL){
    SecCertificateRef   certArray[1] = {cert};
    CFArrayRef certs = CFArrayCreate(kCFAllocatorDefault, (void *)certArray, 1, NULL);
    status = SecTrustCreateWithCertificates(certs, policy, &trust);

    if (status == errSecSuccess){
        status = SecTrustEvaluate(trust, &trustType);

        // Evaulate the trust.
        switch (trustType) {
            case kSecTrustResultInvalid:
            case kSecTrustResultConfirm:
            case kSecTrustResultDeny:
            case kSecTrustResultUnspecified:
            case kSecTrustResultFatalTrustFailure:
            case kSecTrustResultOtherError:
                break;
            case kSecTrustResultRecoverableTrustFailure:
                *publicKey = SecTrustCopyPublicKey(trust);
                break;
            case kSecTrustResultProceed:
                *publicKey = SecTrustCopyPublicKey(trust);
                break;
        }

    }
} else {
    NSLog(@"CERT == NULL");
}

if (publicKey == NULL) {
    NSLog(@"PUBLIC KEY == NULL");
}

SecKeyRef 始终为 nil，因为证书也为 nil。请帮助我。

Answer 1

您不能只传递关键数据。您必须通过由您的 key 签名的证书才能从证书中提取 key 。参见 this answer到 similar question .