JAVA从一个.p12或.pfx文件中获取公钥和私钥

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原文地址：http://www.cjsdn.net/post/view?bid=6&id=57420&sty=3&age=0/** * Read a p12 format digital certificate. Be careful about the file format. * Sometimes, it might be incompatible. If it happens, import/export again * using netscape(p12) or IE(pfx). */import java.security.KeyStore;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Key;import java.security.cert.Certificate;import java.security.cert.X509Certificate;import java.io.*;import java.util.*;public class ReadP12Cert{    public static void main(String[] args)    {        final String KEYSTORE_FILE     = "cert/dev_coo1.p12";        final String KEYSTORE_PASSWORD = "123";        final String KEYSTORE_ALIAS    = "alias";        try        {            KeyStore ks = KeyStore.getInstance("PKCS12");            FileInputStream fis = new FileInputStream(KEYSTORE_FILE);            // If the keystore password is empty(""), then we have to set            // to null, otherwise it won't work!!!            char[] nPassword = null;            if ((KEYSTORE_PASSWORD == null) || KEYSTORE_PASSWORD.trim().equals(""))            {                nPassword = null;            }            else            {                nPassword = KEYSTORE_PASSWORD.toCharArray();            }            ks.load(fis, nPassword);            fis.close();            System.out.println("keystore type=" + ks.getType());            // Now we loop all the aliases, we need the alias to get keys.            // It seems that this value is the "Friendly name" field in the            // detals tab <-- Certificate window <-- view <-- Certificate            // Button <-- Content tab <-- Internet Options <-- Tools menu            // In MS IE 6.            Enumeration enum = ks.aliases();            String keyAlias = null;            if (enum.hasMoreElements()) // we are readin just one certificate.            {                keyAlias = (String)enum.nextElement();                System.out.println("alias=[" + keyAlias + "]");            }            // Now once we know the alias, we could get the keys.            System.out.println("is key entry=" + ks.isKeyEntry(keyAlias));            PrivateKey prikey = (PrivateKey) ks.getKey(keyAlias, nPassword);            Certificate cert = ks.getCertificate(keyAlias);            PublicKey pubkey = cert.getPublicKey();            System.out.println("cert class = " + cert.getClass().getName());            System.out.println("cert = " + cert);            System.out.println("public key = " + pubkey);            System.out.println("private key = " + prikey);        }        catch (Exception e)        {            e.printStackTrace();        }    }}
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