openresty Aes解密 Java 加密

        之前提到、会采用openresty作为网关进行加解密。在实践的过程中、第一步就要调整代码了。我们之前Java采用的是AES/CBC/PKCS5Padding的填充方式，而openresty的aes.lua里面采用的是openssl的、默认的填充方式是AES/CBC/PKCS7Padding的。而Java本身的加密包是不支持这种填充方式的。需要引入新的加密包bcprov-jdk18on（1.71这个版本对应jdk1.8），这个包能支持AES/CBC/PKCS7Padding的填充模式。

AesBouncycastleUtil

import java.security.Security;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;


@Slf4j
public class AesBouncycastleUtil {

    private static final String CHARSET_NAME = "UTF-8";
    private static final String AES_NAME = "AES";
    // 加密模式
    public static final String AES_ALGORITHM = "AES/CBC/PKCS7Padding";
    static {
        // 指定使用bouncycastle包来加密
        Security.addProvider(new BouncyCastleProvider());
    }

    
    public String encrypt(String text,String key,String iv) {
        byte[] result = null;
        try {
            Cipher cipher = Cipher.getInstance(AES_ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(CHARSET_NAME), AES_NAME);
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, keySpec, paramSpec);
            result = cipher.doFinal(text.getBytes(CHARSET_NAME));
        } catch (Exception e) {
            log.error("AESP7 加密错误：{}",e.toString());
        }
        return Base64.encodeBase64String(result);
    }

    
    public String decrypt(String pass,String key,String iv) {
        try {
            Cipher cipher = Cipher.getInstance(AES_ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(CHARSET_NAME), AES_NAME);
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, keySpec, paramSpec);
            return new String(cipher.doFinal(Base64.decodeBase64(pass)), CHARSET_NAME);
        } catch (Exception e) {
            log.error("AESP7 解密错误：{}",e.toString());
        }
        return null;
    }

    public static void main(String[] args) {
        // 密钥
        String key = "16位字符串";
        // 向量
        String iv = "16位字符串";
        AesBouncycastleUtil aes = new AesBouncycastleUtil();
        String contents = "12d57406-28aa-41f5-818d-6521e44949bd@e086a63d-196c-4b3e-9aa4-768f7d51cf52";
        String encrypt = aes.encrypt(contents,key,iv);
        System.out.println("加密后:" + encrypt);
        String decrypt = aes.decrypt(encrypt,key,iv);
        System.out.println("解密后:" + decrypt);
    }
}

 加密后:PGpgSf1e6ZfD8tzTnHUr4WO8JCNi6GeZE+WP9FfA/rdZRAeFp1Kan8FOVrf0D9FHLIQpMGfKY075EEichxlytedD4Y2zVE7xRJQL0ejnxj4=
解密后:12d57406-28aa-41f5-818d-6521e44949bd@e086a63d-196c-4b3e-9aa4-768f7d51cf52

        上面的key跟iv都是随机生成的、只要是16位就好、还可以加上一些特殊字符。内容的话就是两个uuid。接下来我们将会在openresty中对上面的加密字符串进行解密。

nginx配置

server {
		listen 6378;
        location /redis {
			default_type text/html;
			content_by_lua_file lua/aesUtil.lua;
		}
	}

lua解密脚本

local headers = ngx.req.get_headers()
local key = "16位字符串"
local iv = "16位字符串"
local aes = require "resty.aes"
local str = require "resty.string"
local aes_128_cbc_with_iv = assert(aes:new(key,nil, aes.cipher(128,"cbc"), {iv=iv}))
-- AES 128 CBC with IV and no SALT
local encrypted = aes_128_cbc_with_iv:encrypt("12d57406-28aa-41f5-818d-6521e44949bd@e086a63d-196c-4b3e-9aa4-768f7d51cf52")
ngx.say("AES 128 CBC (WITH IV) encode_base64: ", ngx.encode_base64(encrypted))
ngx.say("token:",headers["token"])
local cipherBytes = ngx.decode_base64(headers["token"])
local text = aes_128_cbc_with_iv:decrypt(cipherBytes)
ngx.say("text:",text)

运行结果：

AES 128 CBC (WITH IV) encode_base64:PGpgSf1e6ZfD8tzTnHUr4WO8JCNi6GeZE+WP9FfA/rdZRAeFp1Kan8FOVrf0D9FHLIQpMGfKY075EEichxlytedD4Y2zVE7xRJQL0ejnxj4=
token:PGpgSf1e6ZfD8tzTnHUr4WO8JCNi6GeZE+WP9FfA/rdZRAeFp1Kan8FOVrf0D9FHLIQpMGfKY075EEichxlytedD4Y2zVE7xRJQL0ejnxj4=
text:12d57406-28aa-41f5-818d-6521e44949bd@e086a63d-196c-4b3e-9aa4-768f7d51cf52