public byte[] encrypt(byte[] data, byte[] key, byte[] ivec, int usage) throws KrbCryptoException {
try {
return Des3.encrypt(key, usage, ivec, data, 0, data.length);
} catch (GeneralSecurityException e) {
KrbCryptoException ke = new KrbCryptoException(e.getMessage());
ke.initCause(e);
throw ke;
}
}
public byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, int usage)
throws KrbApErrException, KrbCryptoException {
try {
return Des3.decrypt(key, usage, ivec, cipher, 0, cipher.length);
} catch (GeneralSecurityException e) {
KrbCryptoException ke = new KrbCryptoException(e.getMessage());
ke.initCause(e);
throw ke;
}
}
/**
* Calculates keyed checksum.
*
* @param data the data used to generate the checksum.
* @param size length of the data.
* @param key the key used to encrypt the checksum.
* @return keyed checksum.
*/
public byte[] calculateKeyedChecksum(byte[] data, int size, byte[] key, int usage)
throws KrbCryptoException {
try {
return Aes128.calculateChecksum(key, usage, data, 0, size);
} catch (GeneralSecurityException e) {
KrbCryptoException ke = new KrbCryptoException(e.getMessage());
ke.initCause(e);
throw ke;
}
}
/**
* Verifies keyed checksum.
*
* @param data the data.
* @param size the length of data.
* @param key the key used to encrypt the checksum.
* @param checksum
* @return true if verification is successful.
*/
public boolean verifyKeyedChecksum(byte[] data, int size, byte[] key, byte[] checksum, int usage)
throws KrbCryptoException {
try {
byte[] newCksum = Aes128.calculateChecksum(key, usage, data, 0, size);
return isChecksumEqual(checksum, newCksum);
} catch (GeneralSecurityException e) {
KrbCryptoException ke = new KrbCryptoException(e.getMessage());
ke.initCause(e);
throw ke;
}
}
/**
* Adds a service key to key table. If the specified key table does not exist, the program will
* automatically generate a new key table.
*/
void addEntry() {
PrincipalName pname = null;
try {
pname = new PrincipalName(principal);
if (pname.getRealm() == null) {
pname.setRealm(Config.getInstance().getDefaultRealm());
}
} catch (KrbException e) {
System.err.println("Failed to add " + principal + " to keytab.");
e.printStackTrace();
System.exit(-1);
}
if (password == null) {
try {
BufferedReader cis = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Password for " + pname.toString() + ":");
System.out.flush();
password = new StringBuffer().append(cis.readLine());
} catch (IOException e) {
System.err.println("Failed to read the password.");
e.printStackTrace();
System.exit(-1);
}
}
try {
// admin.addEntry(pname, password);
table.addEntry(pname, password);
// admin.save();
table.save();
System.out.println("Done!");
System.out.println("Service key for " + principal + " is saved in " + table.tabName());
} catch (KrbCryptoException e) {
System.err.println("Failed to add " + principal + " to keytab.");
e.printStackTrace();
System.exit(-1);
} catch (IOException e) {
System.err.println("Failed to save new entry.");
e.printStackTrace();
System.exit(-1);
}
}
