private PKIApplet() {
   pin = new OwnerPIN(PIN_TRIES, MAX_PIN_SIZE);
   puc = new OwnerPIN(PUC_TRIES, PUC_SIZE);
   rd = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
   pkcs1Cipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
   nopadCipher = Cipher.getInstance(Cipher.ALG_RSA_NOPAD, false);
   md = MessageDigest.getInstance(MessageDigest.ALG_SHA, false);
   tmp = JCSystem.makeTransientByteArray(TMP_SIZE, JCSystem.CLEAR_ON_DESELECT);
   state = STATE_INITIAL;
   authKeyId = new byte[KEY_ID_SIZE];
   signKeyId = new byte[KEY_ID_SIZE];
   decKeyId = new byte[KEY_ID_SIZE];
   authKeyPrivate =
       (RSAPrivateCrtKey)
           KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_CRT_PRIVATE, KeyBuilder.LENGTH_RSA_1024, false);
   signKeyPrivate =
       (RSAPrivateCrtKey)
           KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_CRT_PRIVATE, KeyBuilder.LENGTH_RSA_1024, false);
   decKeyPrivate =
       (RSAPrivateCrtKey)
           KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_CRT_PRIVATE, KeyBuilder.LENGTH_RSA_1024, false);
   tempKeyPublic =
       (RSAPublicKey)
           KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC, KeyBuilder.LENGTH_RSA_1024, false);
   currentPrivateKey = JCSystem.makeTransientObjectArray((short) 1, JCSystem.CLEAR_ON_DESELECT);
   expectedDecipherDataLength =
       JCSystem.makeTransientShortArray((short) 1, JCSystem.CLEAR_ON_DESELECT);
   fileSystem = new FileSystem((short) 16);
 }
  /**
   * Pads the input according to the RSASSA-PSS algorithm, the result is placed in output. The input
   * should be 20-byte SHA1 hash of the message to be signed. This method *does not* do signing
   * (encrypting) itself. Due to the randomness of this algorithm the subsequent signing may fail
   * (when the result of this method is larger than the key modulus) in which case the padding
   * should be attempted again.
   */
  private void pssPad(
      byte[] input,
      short inOffset,
      short hashLen,
      byte[] output,
      short outputOffset,
      short emLen,
      byte firstKeyByte)
      throws CryptoException {
    do {
      short hLen = hashLen;
      short outOffset = outputOffset;
      if (hLen != SHA1_LEN
          || (short) (inOffset + hLen) > input.length
          || (short) (outOffset + emLen) > output.length) {
        CryptoException.throwIt(CryptoException.ILLEGAL_VALUE);
      }
      short sLen = SHA1_LEN;
      short psLen = (short) (emLen - sLen - hLen - 2);
      Util.arrayFillNonAtomic(output, outOffset, emLen, (byte) 0x00);
      md.update(output, outOffset, (short) 8);
      md.update(input, inOffset, hLen);
      rd.generateData(output, (short) (outOffset + psLen + 1), sLen);
      md.doFinal(output, (short) (outOffset + psLen + 1), sLen, tmp, TMP_HASH_OFFSET);

      output[(short) (outOffset + psLen)] = (byte) 0x01;
      Util.arrayFillNonAtomic(output, outOffset, psLen, (byte) 0x00);

      short hOffset = (short) (outOffset + emLen - hLen - 1);
      Util.arrayCopyNonAtomic(tmp, TMP_HASH_OFFSET, output, hOffset, hLen);
      output[(short) (outOffset + emLen - 1)] = (byte) 0xbc;
      tmp[(short) (TMP_C_OFFSET + C_LEN - 1)] = 0;
      while (outOffset < hOffset) {
        md.update(output, hOffset, hLen);
        md.doFinal(tmp, TMP_C_OFFSET, C_LEN, tmp, TMP_HASH_OFFSET);
        if ((short) (outOffset + hLen) > hOffset) {
          hLen = (short) (hOffset - outOffset);
        }
        for (short i = 0; i < hLen; i++) {
          output[outOffset++] ^= tmp[(short) (TMP_HASH_OFFSET + i)];
        }
        tmp[(short) (TMP_C_OFFSET + C_LEN - 1)]++;
      }
    } while (firstKeyByte <= tmp[TMP_OFFSET]);
  }