@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;
}
@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;
}