package xiaozhi.common.utils;
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import java.nio.charset.StandardCharsets;
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import java.util.Base64;
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import javax.crypto.Cipher;
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import javax.crypto.spec.SecretKeySpec;
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public class AESUtils {
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private static final String ALGORITHM = "AES";
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private static final String TRANSFORMATION = "AES/ECB/PKCS5Padding";
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/**
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* AES加密
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*
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* @param key 密钥（16位、24位或32位）
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* @param plainText 待加密字符串
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* @return 加密后的Base64字符串
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*/
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public static String encrypt(String key, String plainText) {
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try {
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// 确保密钥长度为16、24或32位
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byte[] keyBytes = padKey(key.getBytes(StandardCharsets.UTF_8));
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SecretKeySpec secretKey = new SecretKeySpec(keyBytes, ALGORITHM);
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Cipher cipher = Cipher.getInstance(TRANSFORMATION);
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cipher.init(Cipher.ENCRYPT_MODE, secretKey);
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byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
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return Base64.getEncoder().encodeToString(encryptedBytes);
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} catch (Exception e) {
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throw new RuntimeException("AES加密失败", e);
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}
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}
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/**
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* AES解密
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*
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* @param key 密钥（16位、24位或32位）
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* @param encryptedText 待解密的Base64字符串
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* @return 解密后的字符串
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*/
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public static String decrypt(String key, String encryptedText) {
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try {
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// 确保密钥长度为16、24或32位
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byte[] keyBytes = padKey(key.getBytes(StandardCharsets.UTF_8));
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SecretKeySpec secretKey = new SecretKeySpec(keyBytes, ALGORITHM);
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Cipher cipher = Cipher.getInstance(TRANSFORMATION);
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cipher.init(Cipher.DECRYPT_MODE, secretKey);
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byte[] encryptedBytes = Base64.getDecoder().decode(encryptedText);
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byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
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return new String(decryptedBytes, StandardCharsets.UTF_8);
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} catch (Exception e) {
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throw new RuntimeException("AES解密失败", e);
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}
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}
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/**
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* 填充密钥到指定长度（16、24或32位）
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*
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* @param keyBytes 原始密钥字节数组
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* @return 填充后的密钥字节数组
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*/
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private static byte[] padKey(byte[] keyBytes) {
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int keyLength = keyBytes.length;
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if (keyLength == 16 || keyLength == 24 || keyLength == 32) {
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return keyBytes;
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}
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// 如果密钥长度不足，用0填充；如果超过，截取前32位
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byte[] paddedKey = new byte[32];
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System.arraycopy(keyBytes, 0, paddedKey, 0, Math.min(keyLength, 32));
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return paddedKey;
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}
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}
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