iOS SecKeyRef来自NSString

Question

我需要使用公钥将用户密码加密为base64字符串。

公钥是NSString。

就像这样：

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

我怎样用它做SecKeyRef呢？

我找到了一个教程这里

但我无法使它工作，因为SecCertificateCreateWithData总是返回零。

这是我的密码

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总是为零，因为证书也是零。请帮帮我。

Answer 1

你不能只传递关键数据。您必须通过一个由您的密钥签名的证书，才能从证书中提取密钥。参见这个答案 to a 相似问题。