乐趣区

开放平台核心功能授权

系统交互流程(OAuth2.0)

授权码生成

加密解密算法(AES)


import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

/**
 * @author liuzhongxu
 * @date 2019/4/16
 */
public class AESUtil {
    /**
     * 算法名称
     */
    public static final String KEY_ALGORITHM = "AES";
    /**
     * 算法名称 / 加密模式 / 填充方式
     */
    public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    /**
     * 编码
     */
    public static final String CHARSET_NAME = "UTF-8";

    /**
     *
     * 生成密钥 key 对象
     * @param keyStr 密钥字符串
     * @return 密钥对象
     * @throws InvalidKeyException
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
     * @throws Exception
     */
    private static SecretKey keyGenerator(String keyStr) throws Exception {SecretKeySpec secretKey = new SecretKeySpec(keyStr.getBytes(CHARSET_NAME), KEY_ALGORITHM);
        return secretKey;
    }
    /**
     * 加密数据
     * @param data 待加密数据
     * @param key 密钥
     * @return 加密后的数据
     */
    public static String encrypt(String data, String key) throws Exception {Key secretKey = keyGenerator(key);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes(CHARSET_NAME));
        // 实例化 Cipher 对象,它用于完成实际的加密操作
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化 Cipher 对象,设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] results = cipher.doFinal(data.getBytes(CHARSET_NAME));
        // 执行加密操作。加密后的结果通常都会用 Base64 编码进行传输
        return Base64.encodeBase64String(results);
    }
    /**
     * 解密数据
     * @param data 待解密数据
     * @param key 密钥
     * @return 解密后的数据
     */
    public static String decrypt(String data, String key) throws Exception {Key secretKey = keyGenerator(key);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes(CHARSET_NAME));
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化 Cipher 对象,设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        // 执行解密操作
        return new String(cipher.doFinal(Base64.decodeBase64(data)));
    }
    public static void main(String[] args) throws Exception {
        String source = "工作模式 -->>ECB:电子密码本模式、CBC:加密分组链接模式、CFB:加密反馈模式、OFB:输出反馈模式";
        System.out.println("原文:" + source);
        String key = "A1B2C3D4A1B2C3D4";
        String encryptData = encrypt(source, key);
        System.out.println("加密后:" + encryptData);
        String decryptData = decrypt(encryptData, key);
        System.out.println("解密后:" + decryptData);
    }
}

计算签名

    /**
     * 计算签名
     */
    private static String calculateSign(String source, String accessSecret) throws InvalidKeyException {
        try {
            //HmacSHA256 加密
            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(new SecretKeySpec(accessSecret.getBytes("UTF-8"), "HmacSHA256"));
            byte[] signData = mac.doFinal(source.getBytes("UTF-8"));
            //bas64 加密
            return Base64.getEncoder().encodeToString(signData);
        } catch (NoSuchAlgorithmException e) {throw new RuntimeException("HMAC-SHA1 not supported.");
        } catch (UnsupportedEncodingException e) {throw new RuntimeException("UTF-8 not supported.");
        }
 
    }
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