Herramienta de cifrado y descifrado AES

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;

public class AESUtils {

    /**
     * 16 进制字符
     */
    private static final char[] digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    public static void main(String[] args) throws Exception {
        String AES_KEY = "Pt120ΦV1ΘcΣLσEοjbΓMιfΦeΧyAUK5Ψ5ΙBνJΚS6γλB34m58ΞςEθ";

        for (int i = 0; i < 10; i++) {
            Thread.sleep(200);
            long start = System.currentTimeMillis();
            String e = encrypt("{\"timestamp\":\"" + System.currentTimeMillis() + "\"}", AES_KEY);
            System.out.println(e);
            String s = decrypt(e, AES_KEY);
            System.out.println(s);
            System.out.println(System.currentTimeMillis() - start);
        }

    }

    public static String encrypt(String text, String key) {
        try {
            // 创建AES的 key 生成器
            KeyGenerator generator = KeyGenerator.getInstance("AES");
            generator.init(128, new SecureRandom(key.getBytes()));
            // 生成密钥
            SecretKey secretKey = generator.generateKey();
            byte[] encoded = secretKey.getEncoded();
            // 生成AES专用密钥Key
            SecretKeySpec spec = new SecretKeySpec(encoded, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            byte[] content = text.getBytes(StandardCharsets.UTF_8);
            cipher.init(Cipher.ENCRYPT_MODE, spec); // 加密模式

            return byteToHex(cipher.doFinal(content));
        } catch (Exception ignore) {
        }
        return null;
    }

    public static String byteToHex(byte[] bytes) {
        StringBuilder builder = new StringBuilder();
        for (byte b : bytes) {
            int hex = b & 0xFF;
            builder.append(digit[hex / 16])
                    .append(digit[hex % 16]);
        }
        return builder.toString();
    }

    /**
     * 字符转换为 16进制整型
     *
     * @param c 0~9 A~F
     * @return hex
     */
    private static int hexToInt(char c) {
        if (c <= '9') {
            return c - 48;
        } else {
            return c - 55; // A = 10 ,so c>=65 { c - 55}
        }
    }

    public static String decrypt(String content, String key) {
//        content = content.toUpperCase();
        try {
            byte[] bArrays = new byte[content.length() / 2];
            int j = 0;
            for (int i = 0; i < content.length(); i += 2) {
                int b = hexToInt(content.charAt(i)) * 16 + hexToInt(content.charAt(i + 1));
                bArrays[j++] = (byte) b;
            }

            // 创建AES的 key 生成器
            KeyGenerator generator = KeyGenerator.getInstance("AES");
            generator.init(128, new SecureRandom(key.getBytes()));
            SecretKey secretKey = generator.generateKey();
            byte[] encoded = secretKey.getEncoded();
            // 转换为AES专用密钥
            SecretKeySpec spec = new SecretKeySpec(encoded, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, spec);
            return new String(cipher.doFinal(bArrays), StandardCharsets.UTF_8);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

De todos modos, hay tantos cifrados y descifrados que no deberías ver mi frustración.