How to use a certificate for encryption in java se

Question

I've to code an app in java that let the user write a text and use a certificate to encrypt this string and show it (encrypted) in a textfield. I coded the graphical interface but i've searched for how to use certificate to encrypt/decrypt a variable in java and i didn't find something for my case ! Thanks for your help.

Answer 1

您的证书可以导出为文件（例如：“mycert.cer”）。然后使用JCA（Java Cryptography Architecture）提供的API来操作它。

例如，要阅读证书，您可以使用

select()

从FileInputStream fis = new FileInputStream("mycert.cer"); CertificateFactory cf = CertificateFactory.getInstance("X509"); X509Certificate crt = (X509Certificate) cf.generateCertificate(fis); 对象的公钥，您可以加密您的文本。您需要的一切都是here和here。