if (args.length != 2) {
System.err.println("Usage: java DigestEncryptor filename password");
return;
}
String filename = args[0];
String password = args[1];
if (password.length() < 8 ) {
System.err.println("Password must be at least eight characters long");
}
FileInputStream fin = new FileInputStream(filename);
FileOutputStream fout = new FileOutputStream(filename +".des");
FileOutputStream digest = new FileOutputStream(filename + ".des.digest");
// Create the key.
byte[] desKeyData = password.getBytes();
DESKeySpec desKeySpec = new DESKeySpec(desKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey desKey = keyFactory.generateSecret(desKeySpec);
// Use Data Encryption Standard.
Cipher des = Cipher.getInstance("DES/ECB/PKCS5Padding");
des.init(Cipher.ENCRYPT_MODE, desKey);
CipherInputStream cin = new CipherInputStream(fin, des);
// Use SHA digest algorithm.
MessageDigest sha = MessageDigest.getInstance("SHA");
DigestInputStream din = new DigestInputStream(cin, sha);
byte[] input = new byte[64];
while (true) {
int bytesRead = din.read(input);
if (bytesRead == -1) break;
fout.write(input, 0, bytesRead);
}
digest.write(sha.digest());
digest.close();
din.close();
fout.flush();
fout.close();
