/**
* 文件file進行加密並保存目標文件destFile中
*
* @param file 要加密的文件 如c:/test/srcFile.txt
* @param destFile 加密後存放的文件名 如c:/加密後文件.txt
*/
public void encrypt(String file, String destFile) throws Exception {
Cipher cipher = Cipher.getInstance("DES");
// cipher.init(Cipher.ENCRYPT_MODE, getKey());
cipher.init(Cipher.ENCRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(destFile);
CipherInputStream cis = new CipherInputStream(is, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = cis.read(buffer)) > 0) {
out.write(buffer, 0, r);
}
cis.close();
is.close();
out.close();
}
/**
* 文件採用DES算法解密文件
*
* @param file 已加密的文件 如c:/加密後文件.txt
* * @param destFile
* 解密後存放的文件名 如c:/ test/解密後文件.txt
*/
public void decrypt(String file, String dest) throws Exception {
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(dest);
CipherOutputStream cos = new CipherOutputStream(out, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = is.read(buffer)) >= 0) {
System.out.println();
cos.write(buffer, 0, r);
}
cos.close();
out.close();
is.close();
}
//加密和解密的測試
public static void main(String[] args) throws Exception {
TestDES td = new TestDES("aaa");
td.encrypt("e:/r.txt", "e:/r解密.txt"); //加密
td.decrypt("e:/r解密.txt", "e:/r1.txt"); //解密
}
}