public static void main(String args[]) throws Exception {
// 参数
String cacert = args[0];
String lfcert = args[1];
// CA "Xu Yingxiao"的证书
CertificateFactory cf = CertificateFactory.getInstance("X.509");
FileInputStream in1 = new FileInputStream(cacert);
java.security.cert.Certificate cac = cf.generateCertificate(in1);
in1.close();
// 用户"Liu Fang"的签名证书
FileInputStream in2 = new FileInputStream(lfcert);
java.security.cert.Certificate lfc = cf.generateCertificate(in2);
in2.close();
PublicKey pbk = cac.getPublicKey();
boolean pass = false;
try {
lfc.verify(pbk);
pass = true;
} catch (Exception e) {
pass = false;
System.out.println(e);
}
if (pass) {
System.out.println("The Certificate is signed by the CA Xu Yingxiao");
} else {
System.out.println("!!!The Certificate is not signed by the CA Xu Yingxiao");
}
}
// Loads an X.509 certificate from a file.
public static X509Certificate loadCertificate(final String file)
throws IOException, CertificateException {
FileInputStream stream = null;
try {
stream = inputStream(file);
return (X509Certificate) X509CertFactory().generateCertificate(stream);
} finally {
if (stream != null) {
stream.close();
}
}
}