知识大全 在Jini,RMI和Applet中如何实现代码签名
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第一段代码:生成公开/私有密钥对并在命令行中指定文件 把密钥对写入该文件 import java security *; import java io *; public class KeyPairGen public static void main(String[] args) if(args length!= ) System out println( Usage: java KeyPairGen KeyFile ); System exit( ); KeyPairGen obj=new KeyPairGen(); try obj gen(args[ ]); catch(NoSuchAlgorithmException ex) System out println( NoSuchAlgorithmException ); catch(FileNotFoundException ex) System out println( FileNotFoundException ); catch(IOException ex) System out println( IOException ); public void gen(String source) throws NoSuchAlgorithmException FileNotFoundException IOException KeyPairGenerator kpGen=KeyPairGenerator getInstance( DSA ); kpGen initialize( ); KeyPair kPair=kpGen genKeyPair(); FileOutputStream fos=new FileOutputStream(source); ObjectOutputStream oos=new ObjectOutputStream(fos); oos writeObject(kPair); fos close(); oos close(); 第二段代码 命令行中指定存放密钥的文件 用于签名的字符串(这里使用字符串只是为了简单 其实在真正实际使用中应该换成用MD 或SHA 算法计算某一文件流的消息摘要值)和签名所存放的文件 功能是计算出签名并把该签名存放在文件中 import java security *; import java io *; public class SignGen public static void main(String[] args) if(args length!= ) System out println( Usage: java SignGen KeyFile String SigFile ); System exit( ); SignGen obj=new SignGen(); try obj genSignature(args[ ] args[ ] args[ ]); catch(NoSuchAlgorithmException ex) System out println( NoSuchAlgorithmException ); catch(InvalidKeyException ex) System out println( InvalidKeyException ); catch(SignatureException ex) System out println( SignatureException ); catch(ClassNotFoundException ex) System out println( ClassNotFoundException ); catch(FileNotFoundException ex) System out println( FileNotFoundException ); catch(IOException ex) System out println( IOException ); public void genSignature(String keyFile String str String sigFile) throws NoSuchAlgorithmException InvalidKeyException SignatureException ClassNotFoundException FileNotFoundException IOException FileInputStream fis=new FileInputStream(keyFile); ObjectInputStream ois=new ObjectInputStream(fis); KeyPair kp=(KeyPair)ois readObject(); PublicKey pubKey=kp getPublic(); PrivateKey priKey=kp getPrivate(); fis close(); ois close(); Signature sig=Signature getInstance( SHA WithDSA ); sig initSign(priKey); sig update(str getBytes()); byte[] b=sig sign(); FileOutputStream fos=new FileOutputStream(sigFile); ObjectOutputStream oos=new ObjectOutputStream(fos); oos writeObject(b); fos close(); oos close(); 第三段代码当然是用于验证签名了 命令行中指定三个参数 密钥文件 更新验证的字符串和签名文件 import java security *; import java io *; public class SignVerify public static void main(String[] args) if(args length!= ) System out println( Usage: java SignVerify KeyFile String SigFile ); System exit( ); SignVerify obj=new SignVerify(); try obj verify(args[ ] args[ ] args[ ]); catch(NoSuchAlgorithmException ex) System out println( NoSuchAlgorithmException ); catch(InvalidKeyException ex) System out println( InvalidKeyException ); catch(SignatureException ex) System out println( SignatureException ); catch(ClassNotFoundException ex) System out println( ClassNotFoundException ); catch(FileNotFoundException ex) System out println( FileNotFoundException ); catch(IOException ex) System out println( IOException ); public void verify(String keyFile String str String sigFile) throws NoSuchAlgorithmException InvalidKeyException SignatureException ClassNotFoundException FileNotFoundException IOException FileInputStream fis=new FileInputStream(keyFile); ObjectInputStream ois=new ObjectInputStream(fis); KeyPair kp=(KeyPair)ois readObject(); PublicKey pubKey=kp getPublic(); PrivateKey priKey=kp getPrivate(); fis close(); ois close(); FileInputStream fis =new FileInputStream(sigFile); ObjectInputStream ois =new ObjectInputStream(fis ); byte[] b=(byte[])ois readObject(); fis close(); ois close(); Signature sig=Signature getInstance( SHA WithDSA ); sig initVerify(pubKey); sig update(str getBytes()); if(sig verify(b)) System out println( Verify OK! ); else System out println( Verify Error! ); 在验证过程中 密钥对 字符串和签名一个都不能错 否则无法通过验证 cha138/Article/program/Java/hx/201311/26967相关参考