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();
}
}