Java读取证书、公钥、私钥

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.util.Enumeration;

import com.sun.org.apache.xml.internal.security.utils.Base64;
import com.help.Conf_Info;

public class VerifiSign2
{
public void main(String[] args)
{
getPrivateKeyInfo();
getPublicKeyInfo();
}

/**
* 获取私钥别名等信息
*/
public String getPrivateKeyInfo()
{
String privKeyFileString = Conf_Info.PrivatePath;
String privKeyPswdString = "" + Conf_Info.password;
String keyAlias = null;
try
{
KeyStore keyStore = KeyStore.getInstance("PKCS12");
FileInputStream fileInputStream = new FileInputStream(privKeyFileString);
char[] nPassword = null;
if ((privKeyPswdString == null) || privKeyPswdString.trim().equals(""))
{
nPassword = null;
} else
{
nPassword = privKeyPswdString.toCharArray();
}
keyStore.load(fileInputStream, nPassword);
fileInputStream.close();
System.out.println("keystore type=" + keyStore.getType());

Enumeration<string> enumeration = keyStore.aliases();

if (enumeration.hasMoreElements())
{
keyAlias = (String) enumeration.nextElement();
System.out.println("alias=[" + keyAlias + "]");
}
System.out.println("is key entry=" + keyStore.isKeyEntry(keyAlias));
PrivateKey prikey = (PrivateKey) keyStore.getKey(keyAlias, nPassword);
Certificate cert = keyStore.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)
{
System.out.println(e);
}
return keyAlias;
}

/**
* 获取公钥信息
*/
public void getPublicKeyInfo()
{
String tmp0 = Conf_Info.Public_cer;
String tmp1 = "";
try
{
tmp1 = getPublicKey(Conf_Info.PublicCerPath).replaceAll("\n", "");
System.out.println("商户公钥字符串：\n" + tmp1);
System.out.println("\n商户公钥字符给定串：\n" + tmp0);
if (tmp0.equals(tmp1))
System.out.println("=========");
else
{
System.out.println("**************");
}

} catch (CertificateException e)
{
e.printStackTrace();
System.out.println(e);
} catch (IOException e)
{
e.printStackTrace();
System.out.println(e);
}
}

/**
* 读取公钥cer
*
* @param path
*            .cer文件的路径 如：c:/abc.cer
* @return base64后的公钥串
* @throws IOException
* @throws CertificateException
*/
public static String getPublicKey(String path) throws IOException, CertificateException
{
InputStream inStream = new FileInputStream(path);
ByteArrayOutputStream out = new ByteArrayOutputStream();
int ch;
String res = "";
while ((ch = inStream.read()) != -1)
{
out.write(ch);
}
byte[] result = out.toByteArray();
// res = Base64.byteArrayToBase64(result);
res = Base64.encode(result);
return res;
}

}