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Editorial Team
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Asked: 2026-05-23T05:10:33+00:00

I am working on a java based licensing project. I have a digital certificate

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I am working on a java based licensing project. I have a digital certificate file and the data for which the signature was generated. Is there some API or means to get the public key from these information? Basically Public Key from the data and digital certificate information.

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  1. Editorial Team

    Your question is very vague IMHO.

    I have a digital certificate file and
    the data for which the signature was
    generated

    If the certificate file has the public key used to verify the signature then you can load it using standard java apis (assuming X509 Certificates). 

    FileInputStream fin = new FileInputStream("PathToCertificate");
CertificateFactory f = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate)f.generateCertificate(fin);
PublicKey pk = certificate.getPublicKey();

    Once you have the public key you can use it to verify the signature.
    Is this what you want?

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