办公设备、办公用品管理程序.doc

一：需要包含的包import java.security.*;import java.io.*;import java.util.*;import java.security.*;import java.security.cert.*;import sun.security.x509.*import java.security.cert.Certificate;import java.security.cert.CertificateFactory;二：从文件中读取证书用keytool将.keystore中的证书写入文件中，然后从该文件中读取证书信息CertificateFactory cf=CertificateFactory.getInstance(X.509);FileInputStream in=new FileInputStream(out.csr);Certificate c=cf.generateCertificate(in);String s=c.toString();三：从密钥库中直接读取证书String pass=123456;FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,pass.toCharArray();java.security.cert.Certificate c=ks.getCertificate(alias);/alias为条目的别名四：JAVA程序中显示证书指定信息System.out.println(输出证书信息:n+c.toString();System.out.println(版本号:+t.getVersion();System.out.println(序列号:+t.getSerialNumber().toString(16);System.out.println(主体名：+t.getSubjectDN();System.out.println(签发者：+t.getIssuerDN();System.out.println(有效期：+t.getNotBefore();System.out.println(签名算法：+t.getSigAlgName();byte sig=t.getSignature();/签名值PublicKey pk=t.getPublicKey();byte pkenc=pk.getEncoded();System.out.println(公钥);for(int i=0;ipkenc.length;i+)System.out.print(pkenci+,);五：JAVA程序列出密钥库所有条目String pass=123456;FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,pass.toCharArray();Enumeration e=ks.aliases();while(e.hasMoreElements()java.security.cert.Certificate c=ks.getCertificate(String)e.nextElement();六：JAVA程序修改密钥库口令String oldpass=123456;String newpass=654321;FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,oldpass.toCharArray();in.close();FileOutputStream output=new FileOutputStream(.keystore);ks.store(output,newpass.toCharArray();output.close();七：JAVA程序修改密钥库条目的口令及添加条目FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,storepass.toCharArray();Certificate cchain=ks.getCertificate(alias);获取别名对应条目的证书链PrivateKey pk=(PrivateKey)ks.getKey(alias,oldkeypass.toCharArray();获取别名对应条目的私钥ks.setKeyEntry(alias,pk,newkeypass.toCharArray(),cchain);向密钥库中添加条目第一个参数指定所添加条目的别名，假如使用已存在别名将覆盖已存在条目，使用新别名将增加一个新条目，第二个参数为条目的私钥，第三个为设置的新口令，第四个为该私钥的公钥的证书链FileOutputStream output=new FileOutputStream(another);ks.store(output,storepass.toCharArray()将keystore对象内容写入新文件八：JAVA程序检验别名和删除条目FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,storepass.toCharArray();ks.containsAlias(sage);检验条目是否在密钥库中，存在返回trueks.deleteEntry(sage);删除别名对应的条目FileOutputStream output=new FileOutputStream(.keystore);ks.store(output,storepass.toCharArray()将keystore对象内容写入文件,条目删除成功九：JAVA程序签发数字证书（1）从密钥库中读取CA的证书FileInputStream in=new FileInputStream(.keystore);KeyStore ks=KeyStore.getInstance(JKS);ks.load(in,storepass.toCharArray();java.security.cert.Certificate c1=ks.getCertificate(caroot);（2）从密钥库中读取CA的私钥PrivateKey caprk=(PrivateKey)ks.getKey(alias,cakeypass.toCharArray();（3）从CA的证书中提取签发者的信息byte encod1=c1.getEncoded();提取CA证书的编码X509CertImpl cimp1=new X509CertImpl(encod1);用该编码创建X509CertImpl类型对象X509CertInfo cinfo1=(X509CertInfo)cimp1.get(X509CertImpl.NAME+.+X509CertImpl.INFO);获取X509CertInfo对象X500Name issuer=(X500Name)cinfo1.get(X509CertInfo.SUBJECT+.+CertificateIssuerName.DN_NAME); 获取X509Name类型的签发者信息（4）获取待签发的证书CertificateFactory cf=CertificateFactory.getInstance(X.509);FileInputStream in2=new FileInputStream(user.csr);java.security.cert.Certificate c2=cf.generateCertificate(in);（5）从待签发的证书中提取证书信息byte encod2=c2.getEncoded();X509CertImpl cimp2=new X509CertImpl(encod2);用该编码创建X509CertImpl类型对象X509CertInfo cinfo2=(X509CertInfo)cimp2.get(X509CertImpl.NAME+.+X509CertImpl.INFO);获取X509CertInfo对象（6）设置新证书有效期Date begindate=new Date(); 获取当前时间Date enddate=new Date(begindate.getTime()+3000*24*60*60*1000L); 有效期为3000天CertificateValidity cv=new CertificateValidity(begindate,enddate); 创建对象cinfo2.set(X509CertInfo.VALIDITY,cv);设置有效期（7）设置新证书序列号int sn=(int)(begindate.getTime()/1000);以当前时间为序列号CertificateSerialNumber csn=new CertificateSerialNumber(sn);cinfo2.set(X509CertInfo.SERIAL_NUMBER,csn);（8）设置新证书签发者cinfo2.set(X509CertInfo.ISSUER+.+CertificateIssuerName.DN_NAME,issuer);应用第三步的结果（9）设置新证书签名算法信息AlgorithmId algorithm=new AlgorithmId(AlgorithmId.md5WithRSAEncryption_oid);cinfo2.set(CertificateAlgorithmId.NAME+.+CertificateAlgorithmId.ALGORITHM,algorithm);（10）创建证书并使用CA的私钥对其签名X509CertImpl newcert=new X509CertImpl(cinfo2);newcert.sign(caprk,MD5WithRSA); 使用CA私钥对其签名（11）将新证书写入密钥库ks.setCertificateEntry(lf_signed,newcert);FileOutputStream out=new FileOutputStream(newstore);ks.store(out,newpass.toCharArray();这里是写入了新的密钥库，也可以使用第七条来增加条目十：数字证书的检验（1）验证证书的有效期（a）获取X509Certificate类型对象CertificateFactory cf=CertificateFactory.getInstance(X.509);FileInputStream in1=new FileInputStream(aa.crt);java.security.cert.Certificatec1=cf.generateCertificate(in1);X509Certificate t=(X509Certificate)c1;in2.close();（b）获取日期Date TimeNow=new Date();（c）检验有效性tryt.checkValidity(TimeNow);System.out.println(OK);catch(CertificateExpiredException e)/过期System.out.println(Expired);System.out.println(e.getMessage();catch(CertificateNotYetValidException e) /尚未生效System.out.println(Too early);System.out.println(e.getMessage();（2）验证证书签名的有效性（a）获取CA证书CertificateFactory cf=CertificateFactory.getInstance(X.509);FileInputStream in2=new