[英]How to Encrypt or Decrypt a File in Java?
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 我想在java中加密和解密文件,我已经阅读了这个网址http://www-users.york.ac.uk/~mal503/lore/pkencryption.htm并且我得到了两个文件,即公共安全证书和私人安全证书文件和private.pem文件,我复制这些文件并粘贴在当前目录中并按如下方式编写java代码,当我运行此操作时不执行加密或解密,请看这个并告诉我哪里出错了
Encrypt Code 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);
Decrypt code 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();
}
You simply have muddled your files. 你只是弄乱了你的文件。 This code works using the DER files generated from openssl as described in the article you linked:
此代码使用从openssl生成的DER文件,如您链接的文章中所述:
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);
}
Here is the Simplest Piece of Code for encrypting a document with any Key(Here Random Key) 这是用于使用任何密钥加密文档的最简单代码(此处是随机密钥)
randomKey = randomKey.substring(0, 16);
keyBytes = randomKey.getBytes();
key = new SecretKeySpec(keyBytes, "AES");
paramSpec = new IvParameterSpec(iv);
ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
in = new FileInputStream(srcFile);
out = new FileOutputStream(encryptedFile);
out = new CipherOutputStream(out, ecipher);
int numRead = 0;
while ((numRead = in.read(buf)) >= 0) {
out.write(buf, 0, numRead);
}
in.close();
out.flush();
out.close();
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