1 Java程序实现密钥库的维护
1.1 Java程序列出密钥库所有条目
import java.util.*;
import java.io.*;
import java.security.*;
public class ShowAlias{
public static void main(String args[ ]) throws Exception{
String pass="080302";
String name=".keystore";
FileInputStream in=new FileInputStream(name);
KeyStore ks=KeyStore.getInstance("JKS");
ks.load(in,pass.toCharArray());
Enumeratione=ks.aliases( );
while( e.hasMoreElements()) {
System.out.println(e.nextElement());
}
}
}
1.2 Java程序修改密钥库口令
import java.io.*;
import java.security.*;
public class SetStorePass{
public static void main(String args[ ]) throws Exception{
char[ ] oldpass="080302".toCharArray();
char[ ] newpass="123456".toCharArray();
String name=".keystore";
FileInputStream in=new FileInputStream(name);
KeyStore ks=KeyStore.getInstance("JKS");
ks.load(in,oldpass);
in.close();
FileOutputStream output=new FileOutputStream(name);
ks.store(output,newpass);
output.close();
}
}
1.3 Java程序修改密钥库条目的口令及添加条目
package test;
import java.io.*;
import java.security.*;
import java.security.cert.Certificate;
public class SetKeyPass{
public static void main(String args[ ]) throws Exception{
//读取相关参数
String name=".keystore";
String alias="mykey";
char[ ] storepass="123456".toCharArray();
char[ ] oldkeypass="080302".toCharArray();
char[ ] newkeypass="123456".toCharArray();
//获取密钥库.keystore的KeyStore对象，并加载密钥库
FileInputStream in=new FileInputStream(name);
KeyStore ks=KeyStore.getInstance("JKS");
ks.load(in,storepass);
//获取别名对应的条目的证书链
Certificate[ ] cchain=ks.getCertificateChain(alias);
//读取别名对应的条目的私钥
PrivateKey pk=(PrivateKey)ks.getKey(alias,oldkeypass);
//向密钥库中添加新的条目
ks.setKeyEntry(alias,pk,newkeypass,cchain);
in.close();
//将KeyStore对象内容写入新文件
FileOutputStream output=new FileOutputStream("333");
ks.store(output,storepass);
output.close();
}
}
1.4 Java程序检验别名及删除条目
package test;
import java.io.*;
import java.security.*;
public class DeleteAlias{
public static void main(String args[ ]) throws Exception{
String pass = "123456";
String name = ".keystore";
String alias = "mykey";
FileInputStream in=new FileInputStream(name);
KeyStore ks=KeyStore.getInstance("JKS");
ks.load(in,pass.toCharArray());
if (ks.containsAlias(alias)){
ks.deleteEntry(alias);
FileOutputStream output=new FileOutputStream(name);
ks.store(output,pass.toCharArray());
System.out.println("Alias "+alias+" deleted");
}else{
System.out.println("Alias not exist");
}
}
}
2 Java程序读取证书和显示证书指定信息
2.1 Java程序从证书文件读取证书
import java.io.*;
import java.security.cert.*;
public class PrintCert{
public static void main(String args[ ]) throws Exception{
CertificateFactory cf=CertificateFactory.getInstance("X.509");
FileInputStream in=new FileInputStream("my.cer");
Certificate c=cf.generateCertificate(in);
in.close();
String s=c.toString( );
// 显示证书
FileOutputStream fout=new FileOutputStream("tmp.txt");
BufferedWriter out= new BufferedWriter(new OutputStreamWriter(fout));
out.write(s,0,s.length( ));
out.close();
}
}
2.2 Java程序从密钥库直接读取证书
import java.io.*;
import java.security.*;
import java.security.cert.Certificate;
public class PrintCert2{
public static void main(String args[ ]) throws Exception{
String pass="080302";
String alias="mykey";
String name=".keystore";
FileInputStream in=new FileInputStream(name);
KeyStore ks=KeyStore.getInstance("JKS");
ks.load(in,pass.toCharArray());
Certificate c=ks.getCertificate(alias);
in.close();
System.out.println(c.toString( ));
}
}
2.3 Java程序显示证书指定信息（全名/公钥/签名等）
import java.io.*;
import java.security.*;
import java.security.cert.*;
import java.math.*;
public class ShowCertInfo{
public static void main(String args[ ]) throws Exception{
CertificateFactory cf=CertificateFactory.getInstance("X.509");
FileInputStream in=new FileInputStream("my.cer");
java.security.cert.Certificate c=cf.generateCertificate(in);
in.close();
X509Certificate t=(X509Certificate) c;
System.out.println("版本号 "+t.getVersion());
System.out.println("序列号 "+t.getSerialNumber().toString(16));
System.out.println("全名 "+t.getSubjectDN());
System.out.println("签发者全名n"+t.getIssuerDN());
System.out.println("有效期起始日 "+t.getNotBefore());
System.out.println("有效期截至日 "+t.getNotAfter());
System.out.println("签名算法 "+t.getSigAlgName());
byte[] sig=t.getSignature();
System.out.println("签名n"+new BigInteger(sig).toString(16));
PublicKey pk=t.getPublicKey();
byte[ ] pkenc=pk.getEncoded();
System.out.println("公钥");
for(int i=0;i< div="">
System.out.print(pkenc[i]+",");
}
}
}
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来源：oschina
链接：https://my.oschina.net/u/3385288/blog/1800599