JKS、BKS、PKCS12证书之间转换

常用的证书库： 
JKS和JCEKS是Java密钥库(KeyStore)的两种比较常见类型，JKS的Provider是SUN，在每个版本的JDK中都有，JCEKS的Provider是SUNJCE，1.4后我们都能够直接使用它。 
JCEKS在安全级别上要比JKS强，使用的Provider是JCEKS(推荐)，尤其在保护KeyStore中的私钥上（使用TripleDES） 
PKCS#12（PFX）是公钥加密标准，它规定了可包含所有私钥、公钥和证书。其以二进制格式存储，在windows中可以直接导入到密钥区，注意，PKCS#12的密钥库保护密码同时也用于保护Key。 
BKS来自BouncyCastleProvider，它使用的也是TripleDES来保护密钥库中的Key，它能够防止证书库被不小心修改（Keystore的keyentry改掉1个bit都会产生错误），BKS能够跟JKS互操作。 
UBER比较特别，当密码是通过命令行提供的时候，它只能跟keytool交互。整个keystore是通过PBE/SHA1/Twofish加密，因此keystore能够防止被误改、察看以及校验。SunJDK允许你在不提供密码的情况下直接加载一个Keystore，类似cacerts，UBER不允许这种情况。 

/** 
     * PFX证书转换为JKS(Java Key Store) 
     *  
     * @param pfxPassword 
     *            PFX证书密码 
     * @param pfxFilePath 
     *            PFX证书路径 
     * @param jksPassword 
     *            JKS证书密码 
     * @param jksFilePath 
     *            JKS证书路径 
     */  
    public static void covertPFXtoJKS(String pfxPassword, String pfxFilePath, String jksPassword, String jksFilePath)  
    {  
        FileInputStream fis = null;  
        FileOutputStream out = null;  
        try  
        {  
            // 加载PFX证书  
            KeyStore inputKeyStore = KeyStore.getInstance("PKCS12");  
            fis = new FileInputStream(pfxFilePath);  
            char[] inPassword = pfxPassword == null ? null : pfxPassword.toCharArray();  
            char[] outPassword = jksPassword == null ? null : jksPassword.toCharArray();  
            inputKeyStore.load(fis, inPassword);  
  
            KeyStore outputKeyStore = KeyStore.getInstance("JKS");  
            outputKeyStore.load(null, outPassword);  
            Enumeration<String> enums = inputKeyStore.aliases();  
            while (enums.hasMoreElements())  
            {  
                String keyAlias = enums.nextElement();  
                if (inputKeyStore.isKeyEntry(keyAlias))  
                {  
                    Key key = inputKeyStore.getKey(keyAlias, inPassword);  
                    Certificate[] certChain = (Certificate[]) inputKeyStore.getCertificateChain(keyAlias);  
                    outputKeyStore.setKeyEntry(keyAlias, key, pfxPassword.toCharArray(), (java.security.cert.Certificate[]) certChain);  
                }  
            }  
            out = new FileOutputStream(jksFilePath);  
            outputKeyStore.store(out, outPassword);  
        } catch (Exception e)  
        {  
            e.printStackTrace();  
        } finally  
        {  
            try  
            {  
                if (fis != null)  
                {  
                    fis.close();  
                }  
                if (out != null)  
                {  
                    out.close();  
                }  
            } catch (Exception e)  
            {  
                e.printStackTrace();  
            }  
        }  
    }  
    
/** 
     * 从JKS格式转换为PKCS12格式 
     *  
     * @param jksFilePath 
     *            String JKS格式证书库路径 
     * @param jksPasswd 
     *            String JKS格式证书库密码 
     * @param pfxFilePath 
     *            String PKCS12格式证书库保存文件夹 
     * @param pfxPasswd 
     *            String PKCS12格式证书库密码 
     */  
public void covertJSKToPFX(String jksFilePath, String jksPasswd, String pfxFolderPath, String pfxPasswd) throws Throwable  
    {  
        FileInputStream fis = null;  
        try  
        {  
            KeyStore inputKeyStore = KeyStore.getInstance("JKS");  
            fis = new FileInputStream(jksFilePath);  
            char[] srcPwd = jksPasswd == null ? null : jksPasswd.toCharArray();  
            char[] destPwd = pfxPasswd == null ? null : pfxPasswd.toCharArray();  
            inputKeyStore.load(fis, srcPwd);  
  
            KeyStore outputKeyStore = KeyStore.getInstance("PKCS12");  
            Enumeration<String> enums = inputKeyStore.aliases();  
            while (enums.hasMoreElements())  
            {  
                String keyAlias = (String) enums.nextElement();  
                System.out.println("alias=[" + keyAlias + "]");  
                outputKeyStore.load(null, destPwd);  
                if (inputKeyStore.isKeyEntry(keyAlias))
                {  
                    Key key = inputKeyStore.getKey(keyAlias, srcPwd);  
                    java.security.cert.Certificate[] certChain = inputKeyStore.getCertificateChain(keyAlias);
                    outputKeyStore.setKeyEntry(keyAlias, key, destPwd, certChain);  
                }  
                String fName = pfxFolderPath + "_" + keyAlias + ".pfx";  
                FileOutputStream out = new FileOutputStream(fName);  
                outputKeyStore.store(out, destPwd);  
                out.close();  
                outputKeyStore.deleteEntry(keyAlias);  
            }  
        } finally  
        {  
            try  
            {  
                if (fis != null)  
                {  
                    fis.close();  
                }  
            } catch (Exception e)  
            {  
                e.printStackTrace();  
            }  
        }  
    }  

/** 
     * 从BKS格式转换为PKCS12格式 
     *  
     * @param jksFilePath 
     *            String JKS格式证书库路径 
     * @param jksPasswd 
     *            String JKS格式证书库密码 
     * @param pfxFilePath 
     *            String PKCS12格式证书库保存文件夹 
     * @param pfxPasswd 
     *            String PKCS12格式证书库密码 
     */  
public void covertBKSToPFX(String jksFilePath, String jksPasswd, String pfxFolderPath, String pfxPasswd) throws Throwable  
    {  
        FileInputStream fis = null;  
        try  
        {  
            KeyStore inputKeyStore = KeyStore.getInstance("BKS", new org.bouncycastle.jce.provider.BouncyCastleProvider());
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());  
            fis = new FileInputStream(jksFilePath);  
            char[] srcPwd = jksPasswd == null ? null : jksPasswd.toCharArray();  
            char[] destPwd = pfxPasswd == null ? null : pfxPasswd.toCharArray();  
            inputKeyStore.load(fis, srcPwd);  
  
            KeyStore outputKeyStore = KeyStore.getInstance("PKCS12");  
            Enumeration<String> enums = inputKeyStore.aliases();  
            while (enums.hasMoreElements())  
            {  
                String keyAlias = (String) enums.nextElement();  
                System.out.println("alias=[" + keyAlias + "]");  
                outputKeyStore.load(null, destPwd);  
                if (inputKeyStore.isKeyEntry(keyAlias))
                {  
                    Key key = inputKeyStore.getKey(keyAlias, srcPwd);  
                    java.security.cert.Certificate[] certChain = inputKeyStore.getCertificateChain(keyAlias);
                    outputKeyStore.setKeyEntry(keyAlias, key, destPwd, certChain);  
                }  
                String fName = pfxFolderPath + "_" + keyAlias + ".pfx";  
                FileOutputStream out = new FileOutputStream(fName);  
                outputKeyStore.store(out, destPwd);  
                out.close();  
                outputKeyStore.deleteEntry(keyAlias);  
            }  
        } finally  
        {  
            try  
            {  
                if (fis != null)  
                {  
                    fis.close();  
                }  
            } catch (Exception e)  
            {  
                e.printStackTrace();  
            }  
        }  
    }  

/** 
     * 列出JKS库内所有X509证书的属性 
     *  
     * @param jksFilePath 
     *            证书库路径 
     * @param jksPasswd 
     *            证书库密码 
     * @param algName 
     *            库类型 
     */  
    public static void listAllCerts(String jksFilePath, String jksPasswd, String algName)  
    {  
        try  
        {  
            char[] srcPwd = jksPasswd == null ? null : jksPasswd.toCharArray();  
            FileInputStream in = new FileInputStream(jksFilePath);  
            KeyStore ks = KeyStore.getInstance(algName);  
            ks.load(in, srcPwd);  
            Enumeration<String> e = ks.aliases();  
            while (e.hasMoreElements())  
            {  
                String alias = e.nextElement();  
                java.security.cert.Certificate cert = ks.getCertificate(alias);  
                if (cert instanceof X509Certificate)  
                {  
                    X509Certificate X509Cert = (X509Certificate) cert;  
                    System.out.println("**************************************");  
                    System.out.println("版本号:" + X509Cert.getVersion());  
                    System.out.println("序列号:" + X509Cert.getSerialNumber().toString(16));  
                    System.out.println("主体名：" + X509Cert.getSubjectDN());  
                    System.out.println("签发者：" + X509Cert.getIssuerDN());  
                    System.out.println("有效期：" + X509Cert.getNotBefore());  
                    System.out.println("签名算法：" + X509Cert.getSigAlgName());  
                    System.out.println("输出证书信息:\n" + X509Cert.toString());  
                    System.out.println("**************************************");  
                }  
            }  
        } catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }  
    
    /*
    * 列出BKS库内所有X509证书的属性 
    *  
    * @param jksFilePath 
    *            证书库路径 
    * @param jksPasswd 
    *            证书库密码 
    * @param algName 
    *            库类型 
    */ 
    public static void listAllCertsBks(String jksFilePath, String jksPasswd, String algName)  
    {  
        try  
        {  
            char[] srcPwd = jksPasswd == null ? null : jksPasswd.toCharArray();  
            FileInputStream in = new FileInputStream(jksFilePath);  
            KeyStore ks = KeyStore.getInstance(algName, new org.bouncycastle.jce.provider.BouncyCastleProvider());
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());    
            ks.load(in, srcPwd);  
            Enumeration<String> e = ks.aliases();  
            while (e.hasMoreElements())  
            {  
                String alias = e.nextElement();  
                java.security.cert.Certificate cert = ks.getCertificate(alias);  
                if (cert instanceof X509Certificate)  
                {  
                    X509Certificate X509Cert = (X509Certificate) cert;  
                    System.out.println("**************************************");  
                    System.out.println("版本号:" + X509Cert.getVersion());  
                    System.out.println("序列号:" + X509Cert.getSerialNumber().toString(16));  
                    System.out.println("主体名：" + X509Cert.getSubjectDN());  
                    System.out.println("签发者：" + X509Cert.getIssuerDN());  
                    System.out.println("有效期：" + X509Cert.getNotBefore());  
                    System.out.println("签名算法：" + X509Cert.getSigAlgName());  
                    System.out.println("输出证书信息:\n" + X509Cert.toString());  
                    System.out.println("**************************************");  
                }  
            }  
        } catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }