Java从pfx中获取公私钥

Java从pfx中获取公私钥

分类： Java2010-07-23
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javastringbyteimportnullexception

[c-sharp] view
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package com.Jinhill;

import java.io.*;

import java.util.*;

import java.security.*;

import java.security.cert.Certificate;

public class ReadPFX {

public ReadPFX (){

}

//转换成十六进制字符串

public static String Byte2String(byte[] b) {

String hs="";

String stmp="";

for (int n=0;n<b.length;n++) {

stmp=(java.lang.Integer.toHexString(b
& 0XFF));

if (stmp.length()==1) hs=hs+"0"+stmp;

else hs=hs+stmp;

//if (n<b.length-1) hs=hs+":";

}

return hs.toUpperCase();

}

public static byte[] StringToByte(int number) {

int temp = number;

byte[] b=new byte[4];

for (int i=b.length-1;i>-1;i--){

b[i] = new Integer(temp&0xff).byteValue();//将最高位保存在最低位

temp = temp >> 8; //向右移8位

}

return b;

}

private PrivateKey GetPvkformPfx(String strPfx, String strPassword){

try {

KeyStore ks = KeyStore.getInstance("PKCS12");

FileInputStream fis = new FileInputStream(strPfx);

// If the keystore password is empty(""), then we have to set

// to null, otherwise it won't work!!!

char[] nPassword = null;

if ((strPassword == null) || strPassword.trim().equals("")){

nPassword = null;

}

else

{

nPassword = strPassword.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 enumas = ks.aliases();

String keyAlias = null;

if (enumas.hasMoreElements())// we are readin just one certificate.

{

keyAlias = (String)enumas.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);

return prikey;

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

}