javax.

Crypto. Cipher is instantiated every time, and a large number of instantiations lead to failure of cipher instantiation.

Solution: put the instantiated cipher object in the HashMap, get it from the map each time, and instantiate it when it doesn’t exist. The problem is solved

// If the key is less than 16 bits, then it will be filled.  The content of this if is important
        int base = 16;
        if (keyBytes.length % base != 0) {
            int groups = keyBytes.length/base + (keyBytes.length % base != 0 ?1 : 0);
            byte[] temp = new byte[groups * base];
            Arrays.fill(temp, (byte) 0);
            System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
            keyBytes = temp;
        }
        // Initialize
        Security.addProvider(new BouncyCastleProvider());
        // convert to JAVA key format
        key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
        try {
            // initialize the cipher to avoid the Cipher not initialized exception when instantiating a lot
            if(cipherMap.containsKey("cipher")) {
                cipher = cipherMap.get("cipher");
            }else {
                cipher = Cipher.getInstance(algorithmStr);
                //Cipher Initialize
                cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv.getBytes("utf-8")));
                cipherMap.put("cipher", cipher);
            }
        } catch (NoSuchAlgorithmException e) {
            log.error(e.getMessage(),e);
        } catch (NoSuchPaddingException e) {
            log.error(e.getMessage(),e);
        } catch (InvalidKeyException e) {
            log.error(e.getMessage(),e);
        } catch (InvalidAlgorithmParameterException e) {
            log.error(e.getMessage(),e);
        } catch (UnsupportedEncodingException e) {
            log.error(e.getMessage(),e);
        }