如何加载公共证书从pem文件..？ [英] How to load public certificate from pem file..?

问题描述

我试图提取该文件下方

----- BEGIN CERTIFICATE -----
MIIGwTCCBamgAwIBAgIQDlV4zznmQiVeF45Ipc0k7DANBgkqhkiG9w0BAQUFADBmMQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNlcnQuY29tMSUwIwYDVQQDExxEaWdpQ2VydCBIaWdoIEFzc3VyYW5jZSBDQS0zMB4XDTEyMTAzMDAwMDAwMFoXDTE1MTEwNDEyMDAwMFowgYIxCzAJBgNVBAYTAlVTMQ4wDAYDVQQIEwVUZXhhczEQMA4GA1UEBxMHSG91c3RvbjEpMCcGA1UEChMgVmFsZXJ1cyBDb21wcmVzc2lvbiBTZXJ2aWNlcywgTFAxCzAJBgNVBAsTAklUMRkwFwYDVQQDDBAqLnZhbGVydXMtY28uY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1GR2NKV9GwVHBtpvgBUdVVbd6qeh6aKOS / r5TIKFd3vFBGjC7cWYwF26F0YFvrAP262Yu + oDRTeuSKwyHmegD7aTSOyCTOva69WcnKYRmNfHsnnGRa5z4v9EKc1RbNcwIrDUz8zcdHdP6AO8JJgLreWyBl15WXdxAr3yNbwoyJTbWk2ToC64LASP + 8SQQTRszg762FIbhZ8xda8KKGAyC29 / FOcLIttoBANT4hEwvcRLKOxAA8tg322Dla1XU2gnxWP2dSuLEflGRcEovPjGqxCzuGe0aN8Lg7aKwgCR1OYXmGiKCNHupHkN7A + QrD8zrxKUFd1UiyLcIovYhadcdQIDAQABo4IDTDCCA0gwHwYDVR0jBBgwFoAUUOpzidsp + xCPnuUBINTeeZlIg / cwHQYDVR0OBBYEFKKX1d9m6kHUjxQ1OpzXgNRbNGR4MCsGA1UdEQQkMCKCECoudmFsZXJ1cy1jby5jb22CDnZhbGVydXMtY28uY29tMA4GA1UdDwEB / wQEAwIFoDATBgNVHSUEDDAKBggrBgEFBQcDATBhBgNVHR / wQCMAAwDQYJKoZIhvcNAQEFBQADggEBALdCoLlXX4Sg8pKcqlT8l1MHbS2rsnw03R8lVQBQqcJimE9VZqDdoLfEPASIEMQbl40T6RHb4tFuZNjP2y4Fy3jMAYf1yajZAtAd5OLOMU39cgZQY2J8QCeEVKt8qbH6P32 / 2yyuh4hcNL4Vz8G0MTzwVUjz8WVmUBHAQSpS0T9oDKkwvmrkPGJFVuBxCRDKYb / 23O8EKKzSTiO37VbCaeFUrTuWc8tGP8XDqRdj2yefiVqcNp4xr2tq9ZhJcISWODqO4fzt6vPOwgdnY3fbPLeH2tZoZTSCPURAadoNOAIC6fCLFlHjLuRGkxWIHMX3QnrrVD8pC7FnDO09q / aADew =
----- END CERTIFICATE -----

-----BEGIN CERTIFICATE----- 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 -----END CERTIFICATE-----

这是我做的代码。

public static PublicKey loadPublicKeyFromFile(File publicKeyFile) throws Exception {

    FileReader file = new FileReader(publicKeyFile);
    PemReader reader = new PemReader(file);
    X509EncodedKeySpec caKeySpec = new X509EncodedKeySpec(reader.readPemObject().getContent());
    KeyFactory kf = KeyFactory.getInstance("RSA");
    PublicKey caKey = kf.generatePublic(caKeySpec);



    return caKey;
}

但它会抛出

java.security.InvalidKeyException: IOException: ObjectIdentifier() -- data isn't an object ID

从文件中提取RES公钥的适当方法是什么。

What's the appropriate way to extract RES Public key from a file..

推荐答案

X.509证书和X509EncodedKeySpec是完全不同的结构，并且尝试将cert解析为密钥将不起作用。
Java的 X509EncodedKeySpec 实际上是X.509的SubjectPublicKeyInfo，它是证书的一小部分。

An X.509 certificate and an X509EncodedKeySpec are quite different structures, and trying to parse a cert as a key won't work. Java's X509EncodedKeySpec is actually X.509's SubjectPublicKeyInfo, which is a small part of a certificate.

您需要做的是读取并解析证书，然后从证书中提取pubkey。
我不知道BC的方法这样做，但标准的SunJCE CertificateFactory 可以做它$ ​​b $ b（可以读取PEM或DER启动）这样（调整错误清理和错误处理的味道）：

What you need to do is read and parse the cert and then extract the pubkey from the cert. I don't know the BC way to do this, but standard SunJCE CertificateFactory can do it (and can read either PEM or DER to boot) like this (adjust error cleanup and error handling to taste):

    CertificateFactory fact = CertificateFactory.getInstance("X.509");
    FileInputStream is = new FileInputStream (args[0]);
    X509Certificate cer = (X509Certificate) fact.generateCertificate(is);
    PublicKey key = cer.getPublicKey();

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