java代码生成加密算法

由于加密算法是保密的，不能在公共场合公开代码。如果您需要使用加密算法，请使用现有的加密库。Java中有很多加密库可供选择，例如Bouncy Castle，Java Cryptography Extension（JCE）等。您可以根据您的需求选择适合您的加密算法和库。以下是一些常见的加密算法的示例：

1. MD5加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
    public static String md5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(input.getBytes());
            byte[] digest = md.digest();
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02x", b & 0xff));
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}

2. SHA1加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1Util {
    public static String sha1(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(input.getBytes());
            byte[] digest = md.digest();
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02x", b & 0xff));
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}

3. AES加密

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESUtil {
    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
    private static final byte[] IV = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};

    public static String encrypt(String input, String key) {
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivSpec = new IvParameterSpec(IV);
            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
            byte[] encrypted = cipher.doFinal(input.getBytes());
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static String decrypt(String input, String key) {
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivSpec = new IvParameterSpec(IV);
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(input));
            return new String(decrypted);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}