開放平臺核心功能--受權

系統交互流程（OAuth2.0）

受權碼生成

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 {
    /**
     * 算法名稱
     */
    public static final String KEY_ALGORITHM = "AES";
    /**
     *算法名稱/加密模式/填充方式
     */
    public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    /**
     * 編碼
     */
    public static final String CHARSET_NAME = "UTF-8";

    /**
     *
     * 生成密鑰key對象
     * @param keyStr 密鑰字符串
     * @return 密鑰對象
     * @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;
    }
    /**
     * 加密數據
     * @param data 待加密數據
     * @param key 密鑰
     * @return 加密後的數據
     */
    public static String encrypt(String data, String key) throws Exception {
        Key secretKey = keyGenerator(key);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes(CHARSET_NAME));
        // 實例化Cipher對象，它用於完成實際的加密操做
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化Cipher對象，設置爲加密模式
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] results = cipher.doFinal(data.getBytes(CHARSET_NAME));
        // 執行加密操做。加密後的結果一般都會用Base64編碼進行傳輸
        return Base64.encodeBase64String(results);
    }
    /**
     * 解密數據
     * @param data 待解密數據
     * @param key 密鑰
     * @return 解密後的數據
     */
    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對象，設置爲解密模式
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        // 執行解密操做
        return new String(cipher.doFinal(Base64.decodeBase64(data)));
    }
    public static void main(String[] args) throws Exception {
        String source = "工做模式-->>ECB：電子密碼本模式、CBC：加密分組連接模式、CFB：加密反饋模式、OFB：輸出反饋模式";
        System.out.println("原文: " + source);
        String key = "A1B2C3D4A1B2C3D4";
        String encryptData = encrypt(source, key);
        System.out.println("加密後: " + encryptData);
        String decryptData = decrypt(encryptData, key);
        System.out.println("解密後: " + decryptData);
    }
}

計算簽名

/**
     * 計算簽名
     */
    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.");
        }
 
    }