java.util.zipパッケージを使用して zip ファイルを作成する方法を知っている場合は、PBE暗号を作成し、それを CipherOutputStream または CipherInputStream に渡すことができます (読み取りまたは書き込みによって異なります)。
次の手順で開始できます。
public class ZipTest {
public static void main(String [] args) throws Exception {
String password = "password";
write(password);
read(password);
}
private static void write(String password) throws Exception {
OutputStream target = new FileOutputStream("out.zip");
target = new CipherOutputStream(target, createCipher(Cipher.ENCRYPT_MODE, password));
ZipOutputStream output = new ZipOutputStream(target);
ZipEntry e = new ZipEntry("filename");
output.putNextEntry(e);
output.write("helloWorld".getBytes());
output.closeEntry();
e = new ZipEntry("filename1");
output.putNextEntry(e);
output.write("helloWorld1".getBytes());
output.closeEntry();
output.finish();
output.flush();
}
private static Cipher createCipher(int mode, String password) throws Exception {
String alg = "PBEWithSHA1AndDESede"; //BouncyCastle has better algorithms
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(alg);
SecretKey secretKey = keyFactory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance("PBEWithSHA1AndDESede");
cipher.init(mode, secretKey, new PBEParameterSpec("saltsalt".getBytes(), 2000));
return cipher;
}
private static void read(String password) throws Exception {
InputStream target = new FileInputStream("out.zip");
target = new CipherInputStream(target, createCipher(Cipher.DECRYPT_MODE, password));
ZipInputStream input = new ZipInputStream(target);
ZipEntry entry = input.getNextEntry();
while (entry != null) {
System.out.println("Entry: "+entry.getName());
System.out.println("Contents: "+toString(input));
input.closeEntry();
entry = input.getNextEntry();
}
}
private static String toString(InputStream input) throws Exception {
byte [] data = new byte[1024];
StringBuilder result = new StringBuilder();
int bytesRead = input.read(data);
while (bytesRead != -1) {
result.append(new String(data, 0, bytesRead));
bytesRead = input.read(data);
}
return result.toString();
}
}