java实现aes/ecb/pkcspadding7

调用方式：

        // 去除JCE加密限制，只限于Java1.8
        try {
            Field field = Class.forName("javax.crypto.JceSecurity").getDeclaredField("isRestricted");
            field.setAccessible(true);
            Field modifiersField = Field.class.getDeclaredField("modifiers");
            modifiersField.setAccessible(true);
            modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
            field.set(null, false);
        } catch (ClassNotFoundException | NoSuchFieldException | 
            SecurityException | IllegalArgumentException | IllegalAccessException ex) {

        }

            byte [] newkey = new byte[32];
            System.arraycopy(key.getBytes(), 0, newkey, 0, key.getBytes().length);
        	for(int i = key.length() ;i < 32;i ++){
        		newkey[i] = (byte) 0x20;
        	}
            
	          String decodeTest="";
		try {
			String text = "0qZc/yQqCkPwMnWkzht4t520pn9IIo9yKciYvuXFCt4=";
			decodeTest = decrypt( text,newkey);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	          System.out.println("解密结果： " + decodeTest);

函数定义：

    private static final String KEY_ALGORITHM = "AES";

    private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS7Padding";

    public static final String ENCODING = "UTF-8";
    
	private  static String key = "Z016770e6f4f91.83Abez23*";
    private  static byte[] m_iv = 
    	{0x12,0x34,0x56,0x78,(byte) 0x90,(byte) 0xab,(byte) 0xcd,(byte) 0xef,
    	0x12,0x34,0x56,0x78,(byte) 0x90,(byte) 0xab,(byte) 0xcd,(byte) 0xef};

    static {
        // 是PKCS7Padding填充方式，则需要添加Bouncy Castle支持
        Security.addProvider(new BouncyCastleProvider());
    }

    public static String decrypt(String str, byte[] key) throws Exception {
        try {
            Field field = Class.forName("javax.crypto.JceSecurity").getDeclaredField("isRestricted");
            field.setAccessible(true);
            Field modifiersField = Field.class.getDeclaredField("modifiers");
            modifiersField.setAccessible(true);
            modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
            field.set(null, false);
            
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);

            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"));
            byte[] doFinal = cipher.doFinal(Base64.getDecoder().decode(str));
            return new String(doFinal);
        } catch (ClassNotFoundException | NoSuchFieldException | 
            SecurityException | IllegalArgumentException | IllegalAccessException ex) {

        }
        return "";
    }

"AES/ECB/PKCS7Padding"加密方式需要Bouncy castle包的支持，安装Bouncy castle参考以下链接：https://blog.csdn.net/qq_41546054/article/details/120766852