Modifications to PGPKey tmpBuf by creating a shared tmpBuf in OpenPGP…

…Applet and all PGPKey setDPX() methods to take their tmpBuf from the newly created pgpTmpBuf.

applet/src/openpgpcard/OpenPGPApplet.java

@@ -144,6 +144,7 @@ public class OpenPGPApplet extends Applet implements ISO7816 {
  private RandomData random;
 
  private byte[] buffer;
+ private static byte[] pgpTmpBuf;
  private byte[] authRandomBuff;
  private short out_left = 0;
  private short out_sent = 0;
@@ -212,19 +213,31 @@ private void initialize() {
  }
 
  public OpenPGPApplet() {
- // Create temporary array
+ // Create temporary buffer array for message chaining
  buffer = JCSystem.makeTransientByteArray(BUFFER_MAX_LENGTH,
  JCSystem.CLEAR_ON_DESELECT);
+
+ // Create a shared PGP temp buffer for PGPKey usage
+ pgpTmpBuf = JCSystem.makeTransientByteArray((short) (PGPKey.KEY_SIZE_BYTES / 2), JCSystem.CLEAR_ON_DESELECT);
+
+ // Authentication buffer to store random byte used for randomization of login
  authRandomBuff = JCSystem.makeTransientByteArray((short) 1,
  JCSystem.CLEAR_ON_DESELECT);
+
+ // PW1 mode
  pw1_modes = JCSystem.makeTransientBooleanArray((short) 2,
  JCSystem.CLEAR_ON_DESELECT);
 
+ // RSA_PKCS1 cipher
  cipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
+
+ // Secure Random
  random = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
 
+ // SM channel
  sm = new OpenPGPSecureMessaging();
 
+ // INIT()
  initialize();
  }
 
@@ -1357,13 +1370,13 @@ private void importKey(APDU apdu) {
  key.setQ(buffer, offset_data, len_q);
  offset_data += len_q;
 
- key.setPQ(buffer, offset_data, len_pq);
+ key.setPQ(buffer, offset_data, len_pq, pgpTmpBuf);
  offset_data += len_pq;
 
- key.setDP1(buffer, offset_data, len_dp1);
+ key.setDP1(buffer, offset_data, len_dp1, pgpTmpBuf);
  offset_data += len_dp1;
 
- key.setDQ1(buffer, offset_data, len_dq1);
+ key.setDQ1(buffer, offset_data, len_dq1, pgpTmpBuf);
  offset_data += len_dq1;
 
  key.setModulus(buffer, offset_data, len_modulus);