@SuppressWarnings("deprecation")
private byte[] extractKeyData(DerInputStream stream)
throws IOException, NoSuchAlgorithmException, CertificateException {
byte[] returnValue = null;
DerValue[] safeBags = stream.getSequence(2);
int count = safeBags.length;
/*
* Spin over the SafeBags.
*/
for (int i = 0; i < count; i++) {
ObjectIdentifier bagId;
DerInputStream sbi;
DerValue bagValue;
Object bagItem = null;
sbi = safeBags[i].toDerInputStream();
bagId = sbi.getOID();
bagValue = sbi.getDerValue();
if (!bagValue.isContextSpecific((byte) 0)) {
throw new IOException("unsupported PKCS12 bag value type " + bagValue.tag);
}
bagValue = bagValue.data.getDerValue();
if (bagId.equals(PKCS8ShroudedKeyBag_OID)) {
// got what we were looking for. Return it.
returnValue = bagValue.toByteArray();
} else {
// log error message for "unsupported PKCS12 bag type"
System.out.println("Unsupported bag type '" + bagId + "'");
}
}
return returnValue;
}
@SuppressWarnings("deprecation")
private byte[] fetchPrivateKeyFromBag(byte[] privateKeyInfo)
throws IOException, NoSuchAlgorithmException, CertificateException {
byte[] returnValue = null;
DerValue val = new DerValue(new ByteArrayInputStream(privateKeyInfo));
DerInputStream s = val.toDerInputStream();
int version = s.getInteger();
if (version != 3) {
throw new IOException("PKCS12 keystore not in version 3 format");
}
/*
* Read the authSafe.
*/
byte[] authSafeData;
ContentInfo authSafe = new ContentInfo(s);
ObjectIdentifier contentType = authSafe.getContentType();
if (contentType.equals(ContentInfo.DATA_OID)) {
authSafeData = authSafe.getData();
} else /* signed data */ {
throw new IOException("public key protected PKCS12 not supported");
}
DerInputStream as = new DerInputStream(authSafeData);
DerValue[] safeContentsArray = as.getSequence(2);
int count = safeContentsArray.length;
/*
* Spin over the ContentInfos.
*/
for (int i = 0; i < count; i++) {
byte[] safeContentsData;
ContentInfo safeContents;
DerInputStream sci;
byte[] eAlgId = null;
sci = new DerInputStream(safeContentsArray[i].toByteArray());
safeContents = new ContentInfo(sci);
contentType = safeContents.getContentType();
safeContentsData = null;
if (contentType.equals(ContentInfo.DATA_OID)) {
safeContentsData = safeContents.getData();
} else if (contentType.equals(ContentInfo.ENCRYPTED_DATA_OID)) {
// The password was used to export the private key from the keychain.
// The Keychain won't export the key with encrypted data, so we don't need
// to worry about it.
continue;
} else {
throw new IOException("public key protected PKCS12" + " not supported");
}
DerInputStream sc = new DerInputStream(safeContentsData);
returnValue = extractKeyData(sc);
}
return returnValue;
}
/*
* parse Algorithm Parameters
*/
private AlgorithmParameters parseAlgParameters(DerInputStream in) throws IOException {
AlgorithmParameters algParams = null;
try {
DerValue params;
if (in.available() == 0) {
params = null;
} else {
params = in.getDerValue();
if (params.tag == DerValue.tag_Null) {
params = null;
}
}
if (params != null) {
algParams = AlgorithmParameters.getInstance("PBE");
algParams.init(params.toByteArray());
}
} catch (Exception e) {
IOException ioe = new IOException("parseAlgParameters failed: " + e.getMessage());
ioe.initCause(e);
throw ioe;
}
return algParams;
}
/**
* Returns the key associated with the given alias, using the given password to recover it.
*
* @param alias the alias name
* @param password the password for recovering the key. This password is used internally as the
* key is exported in a PKCS12 format.
* @return the requested key, or null if the given alias does not exist or does not identify a
* <i>key entry</i>.
* @exception NoSuchAlgorithmException if the algorithm for recovering the key cannot be found
* @exception UnrecoverableKeyException if the key cannot be recovered (e.g., the given password
* is wrong).
*/
public Key engineGetKey(String alias, char[] password)
throws NoSuchAlgorithmException, UnrecoverableKeyException {
permissionCheck();
// An empty password is rejected by MacOS API, no private key data
// is exported. If no password is passed (as is the case when
// this implementation is used as browser keystore in various
// deployment scenarios like Webstart, JFX and applets), create
// a dummy password so MacOS API is happy.
if (password == null || password.length == 0) {
// Must not be a char array with only a 0, as this is an empty
// string.
if (random == null) {
random = new SecureRandom();
}
password = Long.toString(random.nextLong()).toCharArray();
}
Object entry = entries.get(alias.toLowerCase());
if (entry == null || !(entry instanceof KeyEntry)) {
return null;
}
// This call gives us a PKCS12 bag, with the key inside it.
byte[] exportedKeyInfo = _getEncodedKeyData(((KeyEntry) entry).keyRef, password);
if (exportedKeyInfo == null) {
return null;
}
PrivateKey returnValue = null;
try {
byte[] pkcs8KeyData = fetchPrivateKeyFromBag(exportedKeyInfo);
byte[] encryptedKey;
AlgorithmParameters algParams;
ObjectIdentifier algOid;
try {
// get the encrypted private key
EncryptedPrivateKeyInfo encrInfo = new EncryptedPrivateKeyInfo(pkcs8KeyData);
encryptedKey = encrInfo.getEncryptedData();
// parse Algorithm parameters
DerValue val = new DerValue(encrInfo.getAlgorithm().encode());
DerInputStream in = val.toDerInputStream();
algOid = in.getOID();
algParams = parseAlgParameters(in);
} catch (IOException ioe) {
UnrecoverableKeyException uke =
new UnrecoverableKeyException(
"Private key not stored as " + "PKCS#8 EncryptedPrivateKeyInfo: " + ioe);
uke.initCause(ioe);
throw uke;
}
// Use JCE to decrypt the data using the supplied password.
SecretKey skey = getPBEKey(password);
Cipher cipher = Cipher.getInstance(algOid.toString());
cipher.init(Cipher.DECRYPT_MODE, skey, algParams);
byte[] decryptedPrivateKey = cipher.doFinal(encryptedKey);
PKCS8EncodedKeySpec kspec = new PKCS8EncodedKeySpec(decryptedPrivateKey);
// Parse the key algorithm and then use a JCA key factory to create the private key.
DerValue val = new DerValue(decryptedPrivateKey);
DerInputStream in = val.toDerInputStream();
// Ignore this -- version should be 0.
int i = in.getInteger();
// Get the Algorithm ID next
DerValue[] value = in.getSequence(2);
AlgorithmId algId = new AlgorithmId(value[0].getOID());
String algName = algId.getName();
// Get a key factory for this algorithm. It's likely to be 'RSA'.
KeyFactory kfac = KeyFactory.getInstance(algName);
returnValue = kfac.generatePrivate(kspec);
} catch (Exception e) {
UnrecoverableKeyException uke =
new UnrecoverableKeyException("Get Key failed: " + e.getMessage());
uke.initCause(e);
throw uke;
}
return returnValue;
}