如何在Java中加密或解密文件? [英] How to Encrypt or Decrypt a File in Java?
问题描述
我想在java中加密和解密一个文件,我已经读过这个url http://www-users.york.ac.uk/~mal503/lore/pkencryption.htm ,我有两个文件,即公共安全证书和私人安全证书文件和private.pem文件,i复制这些文件并粘贴到当前目录和worte java代码如下,当我运行这没有加密或解密执行,请看这个,告诉我在哪里我错了
I want to encrypt and decrypt a file in java, i had read this url http://www-users.york.ac.uk/~mal503/lore/pkencryption.htm and i got two files namely public Security certificate and private security certificate file and private.pem file, i copied these files and pasted in the current directory and worte java code as follows, when i run this no encryption or decryption is performed, pls see this and tell me where i went wrong
加密代码
File ecryptfile=new File("encrypt data");
File publickeydata=new File("/publickey");
File encryptmyfile=new File("/sys_data.db");
File copycontent =new File("Copy Data");
secure.makeKey();
secure.saveKey(ecryptfile, publickeydata);
secure.encrypt(encryptmyfile, copycontent);
解密代码
File ecryptfile=new File("encrypt data");
File privateKeyFile=new File("/privatekey");
File encryptmyfile=new File("/sys_data.db");
File unencryptedFile =new File("unencryptedFile");
try {
secure.loadKey(encryptmyfile, privateKeyFile);
secure.decrypt(encryptmyfile, unencryptedFile);
} catch (GeneralSecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
推荐答案
。此代码使用从您链接的文章中描述的openssl生成的DER文件工作:
You simply have muddled your files. This code works using the DER files generated from openssl as described in the article you linked:
FileEncryption secure = new FileEncryption();
// Encrypt code
{
File encryptFile = new File("encrypt.data");
File publicKeyData = new File("public.der");
File originalFile = new File("sys_data.db");
File secureFile = new File("secure.data");
// create AES key
secure.makeKey();
// save AES key using public key
secure.saveKey(encryptFile, publicKeyData);
// save original file securely
secure.encrypt(originalFile, secureFile);
}
// Decrypt code
{
File encryptFile = new File("encrypt.data");
File privateKeyFile = new File("private.der");
File secureFile = new File("secure.data");
File unencryptedFile = new File("unencryptedFile");
// load AES key
secure.loadKey(encryptFile, privateKeyFile);
// decrypt file
secure.decrypt(secureFile, unencryptedFile);
}
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