readencryptedandsignedmail.java

用java实现的对电子邮件进行加密解密及签名的算法接口

package cn.edu.scut.smimeapi;
import java.security.cert.X509Certificate;
import javax.mail.internet.*;
import javax.mail.*;
import cn.edu.scut.certmgr.TokenPrivateKey;
import java.security.PrivateKey;
import org.bouncycastle.mail.smime.*;
/**
 * a class that reads a basic SMIME Encrpted and signed mail.
 */

public class ReadEncryptedAndSignedMail extends ReceiveMail
{

    /**
          * Return a MimeBodyPart which has been descrpted autoally from the EncryptedAndSignedMsg by USB_Token .
          *
          * @param MimeMessage EncryptedMsg,  the message which has been  Encrypted.
          * @paramchar[] userpin, the password which is used to open usb token.
          * @throws Exception
*/
 public MimeBodyPart ReadEncryptedAndSignedMailAutoByToken
         (MimeMessage EncryptedMsg,char[] userpin)
 throws Exception
 {
   MimeBodyPart res=null;
   ReadEncryptedMail rem=new ReadEncryptedMail();
  try
  {
    res=rem.ReadEncryptedMailAutoByToken(EncryptedMsg, userpin);
  }
  catch (Exception ex)
  {
    throw new Exception("ReadEncryptedMailAutoByToken error:"+ex);
  }

  if (res.isMimeType("multipart/signed"))  //邮件解密后res为签名邮件
  {
    try
    {
      ReadSignedMail rsm = new ReadSignedMail();
      res = rsm.ReadSignedMailByPassedCert(res);
    }
    catch (Exception ex2)
    {
     throw new Exception("read signed content error:"+ex2);
    }

  }
   return res;
 }

 /**
           * Return a MimeBodyPart which has been descrpted autoally from the EncryptedAndSignedMsg by USB_Token .
           *
           * @param MimeMessage EncryptedMsg,  the message which has been  Encrypted.
           * @paramchar[] userpin, the password which is used to open usb token.
           * @throws Exception
 */
  public MimeBodyPart ReadEncryptedAndSignedMailByToken
          (MimeMessage EncryptedMsg,TokenPrivateKey TokenKey,X509Certificate cert)
  throws Exception
  {
    MimeBodyPart res=null;
    ReadEncryptedMail rem=new ReadEncryptedMail();
   try
   {
     res=rem.ReadEncryptedMailByToken(EncryptedMsg, TokenKey,cert);
   }
   catch (Exception ex)
   {
     throw new Exception("ReadEncryptedMailByToken error:"+ex);
   }

   if (res.isMimeType("multipart/signed"))  //邮件解密后res为签名邮件
   {
     try
     {
       ReadSignedMail rsm = new ReadSignedMail();
       res = rsm.ReadSignedMailByPassedCert(res);
     }
     catch (Exception ex2)
     {
      throw new Exception("read signed content error:"+ex2);
     }

   }
    return res;
 }

 /**
          * Return a MimeBodyPart which has been descrpted autoally from the EncryptedAndSignedMsg by LocalKey .
          *
          * @param MimeMessage EncryptedMsg,  the message which has been  Encrypted.
          * @paramchar[] userpin, the password which is used to open Local keystore.
          * @throws Exception
*/
public MimeBodyPart ReadEncryptedAndSignedMailAutoByLocalKey
     (MimeMessage EncryptedMsg,char[] userpin)
throws Exception
{
  MimeBodyPart res=null;
  ReadEncryptedMail rem=new ReadEncryptedMail();
 try
 {
   res=rem.ReadEncryptedMailAutoByLocalKey(EncryptedMsg, userpin);
 }
 catch (Exception ex)
 {
   throw new Exception("ReadEncryptedMailAutoByLocalKey error:"+ex);
 }

 if (res.isMimeType("multipart/signed"))  //邮件解密后res为签名邮件
 {
   try
   {
     ReadSignedMail rsm = new ReadSignedMail();
     res = rsm.ReadSignedMailByPassedCert(res);
   }
   catch (Exception ex2)
   {
    throw new Exception("read signed content error:"+ex2);
   }

 }

  return res;
}

    /**
              * Return a MimeBodyPart which has been descrpted from the EncryptedAndSignedMsg by LocalKey .
              *
              * @param MimeMessage EncryptedMsg,  the message which has been  Encrypted.
              * @param PrivateKey privatekey, the key which is to be used to descrpted the msg.
              * @param cert, the X509Certificate to generate a suitable recipient identifier
              * @throws Exception
    */
    public MimeBodyPart ReadEncryptedAndSignedMailByLocalKey
        (MimeMessage EncryptedMsg,PrivateKey privatekey,X509Certificate cert)
    throws Exception
    {
      MimeBodyPart res=null;
      ReadEncryptedMail rem=new ReadEncryptedMail();
     try
     {
       res=rem.ReadEncryptedMailByLocalkey(EncryptedMsg, privatekey,cert);
     }
     catch (Exception ex)
     {
       throw new Exception("ReadEncryptedMailByLocalKey error:"+ex);
     }

     if (res.isMimeType("multipart/signed"))  //邮件解密后res为签名邮件
     {
       try
       {
         ReadSignedMail rsm = new ReadSignedMail();
         res = rsm.ReadSignedMailByPassedCert(res);
       }
       catch (Exception ex2)
       {
        throw new Exception("read signed content error:"+ex2);
       }

     }

      return res;
    }



public static void main(String[] args)
        throws Exception
    {
        try
       {
         ReceiveMail recmail=new ReceiveMail();
         Message[] msg = recmail.getMail("202.38.212.1", "yhliu", "yhliu");
         System.out.println("您好，共收到"+msg.length+"封邮件");
         for (int i = 0; i < msg.length; i++)
         {
           if (msg[i].isMimeType("text/*"))
           { //判断邮件类型为普通文本邮件
             recmail.handleText(msg[i]);
           }
           else
           { //判断邮件类型为非文本邮件
             //
             // make sure this was a multipart/signed message - there should be
             // two parts as we have one part for the content that was signed and
             // one part for the actual signature.
             //
             if (msg[i].isMimeType("multipart/signed")) //签名邮件
             {
               recmail.handle(msg[i]);

               SMIMESigned s = new SMIMESigned((MimeMultipart) msg[i].getContent());

               //
               // extract the content
               //
               MimeBodyPart content = s.getContent();
               Object cont = content.getContent();

               if (cont instanceof String)
               {
                 System.out.println("邮件内容:");
                 System.out.println( (String) cont);
               }
               else if (cont instanceof Multipart)
               {
                  Multipart mp = (Multipart) cont;
                  System.out.println( recmail.handleMultipart(mp));
               }

               System.out.println( verify(s));


             }
             else if (msg[i].isMimeType("application/pkcs7-mime")) //加密邮件
             {
               recmail.handle(msg[i]);
               ReadEncryptedMail rem=new ReadEncryptedMail();
               MimeBodyPart res=null;
               res=rem.ReadEncryptedMailAutoByLocalKey((MimeMessage) msg[i],"tanglab".toCharArray());


          if (res.isMimeType("multipart/signed"))  //邮件解密后res为签名邮件
              {
                SMIMESigned s = new SMIMESigned((MimeMultipart) res.getContent());

             //
             // extract the content
             //
             MimeBodyPart content = s.getContent();
             System.out.println("邮件解密后为签名邮件");

             Object cont = content.getContent();

             if (cont instanceof String)
             {
               System.out.println("邮件内容:");
               System.out.println( (String) cont);
             }
             else if (cont instanceof Multipart)
             {
               Multipart mp = (Multipart) cont;
               System.out.println( recmail.handleMultipart(mp));

             }

             System.out.println( verify(s));

              }
         else  //邮件解密后的res为非签名邮件
          {
            if (res.isMimeType("text/*"))  //邮件解密后的res为文本邮件
            {
               System.out.println("邮件内容：");
               System.out.println(res.getContent());
            }
             else
             {
                System.out.println(recmail.handleMultipart((Multipart)res.getContent()));

             }

          }

       }
   else //Not a signed or an encrypted message!
   {
      System.out.println( recmail.handleMultipart(msg[i]));
   }

   }
   System.out.println("－－－－－－－－－－－－－－－－－－－－－－－－－－－");
   }


   recmail.close();


    }

catch(Exception e2)
    {
   System.out.println(e2);
    }

    }


}