一个用JAVA开发的会话密钥程序 - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-25
| vate static byte[] passwordEncrypt(char[] password,byte[] privateKeyBytes)throws Exception{//create 8 byte saltbyte[] salt=new byte[8];Random random=new Random();random.nextBytes(salt);//create a PBE key and cipherPBEKeySpec keySpec=new PBEKeySpec(password);SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");SecretKey key=keyFactory.generateSecret(keySpec);PBEParameterSpec paramSpec=new PBEParameterSpec(salt,ITERATIONS);Cipher cipher=Cipher.getInstance("PBEWithSHAAndTwofish-CBC");cipher.init(Cipher.ENCRYPT_MODE,key,paramSpec);//Encrypt the byte[]byte[] cipherPriKey=cipher.doFinal(privateKeyBytes);//write out salt ,and then the cipherPriKeyByteArrayOutputStream baos=new ByteArrayOutputStream();baos.write(salt);baos.write(cipherPriKey);return baos.toByteArray();}//用会话密钥加密给定的文件，然后用公钥加密会话密钥，并存入文件中//最后加密后的文件由密钥长度+已加密的密钥（会话密钥）+密文public static void encrypt()throws Exception{//转换成RSA密钥X509EncodedKeySpec keySpec=new X509EncodedKeySpec(publicKeyBytes);KeyFactory keyFactory=KeyFactory.getInstance("RSA");PublicKey publickey=keyFactory.generatePublic(keySpec);//打开存贮密文的文件DataOutputStream output=new DataOutputStream(new FileOutputStream(ENCRPTOR_TEXT_FILE));//创建RSA的CIpherCipher rsaCipher=Cipher.getInstance("RSA/ECB/PKCS1Padding");rsaCipher.init(Cipher.ENCRYPT_MODE,publickey);//创建会话密钥(Rijndael)KeyGenerator rijndaelKeyGenerator=KeyGenerator.getInstance("Rijndael");rijndaelKeyGenerator.init(256);Key rijndaelKey=rijndaelKeyGenerator.generateKey();//公钥加密会话密钥byte[] encodedKeyBytes=rsaCipher.doFinal(rijndaelKey.getEncoded());output.writeInt(encodedKeyBytes.length);output.write(encodedKeyBytes);//产生IV向量SecureRandom random=new SecureRandom();byte[] iv=new byte[16];random.nextBytes(iv);output.write(iv);//加密正文IvParameterSpec spec=new IvParameterSpec(iv);Cipher symmetricCipher=Cipher.getInstance("Rijndael/CBC/PKCS5Padding");symmetricCipher.init(Cipher.ENCRYPT_MODE,rijndaelKey,spec);CipherOutputStream cos=new CipherOutputStream(output,symmetricCipher);FileInputStream input=new FileInputStream(TEXT_FILE);int theByte=0;while((theByte=input.read())!=-1){cos.write(theByte);}input.close();cos.close();return;}//得到私钥private static byte[] passwordDecrypt(char[] password,byte[] ciphertext)throws Exception{byte[] salt=new byte[8];ByteArrayInputStream bais=new ByteArrayInputStream(ciphertext);bais.read(salt,0,8);byte[] remainingCiphertext=new byte[ciphertext.length-8];bais.read(remainingCiphertext,0,ciphertext.length-8);PBEKeySpec keySpec=new PBEKeySpec(password);SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");SecretKey key=keyFactory.generateSecret(keySpec);PBEParameterSpec paramSpec=new PBEParameterSpec(salt,ITERATIONS);Cipher cipher=Cipher.getInstance("PBEWithSHAAndTwofish-CBC");cipher.init(Cipher.DECRYPT_MODE,key,paramSpec);return cip |
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