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."); } }