package com.dy.pipIrrSell.util;
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import javax.crypto.Cipher;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.spec.GCMParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.IOException;
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import java.security.GeneralSecurityException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.util.Base64;
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/**
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* @author ZhuBaoMin
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* @date 2024-03-06 11:46
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* @LastEditTime 2024-03-06 11:46
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* @Description
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*/
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public class AesUtil {
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static final int KEY_LENGTH_BYTE = 32;
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static final int TAG_LENGTH_BIT = 128;
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/**
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* 解密
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* @param apiV3Key apiV3密钥
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* @param associatedData 附加数据
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* @param nonce 随机串
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* @param ciphertext 数据密文
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* @return 解密后字符串
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* @throws GeneralSecurityException
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* @throws IOException
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*/
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public static String decryptToString(byte[] apiV3Key, byte[] associatedData, byte[] nonce, String ciphertext) throws GeneralSecurityException, IOException {
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try {
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Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
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SecretKeySpec key = new SecretKeySpec(apiV3Key, "AES");
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GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, nonce);
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cipher.init(Cipher.DECRYPT_MODE, key, spec);
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cipher.updateAAD(associatedData);
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return new String(cipher.doFinal(Base64.getDecoder().decode(ciphertext)), "utf-8");
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} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
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throw new IllegalStateException(e);
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} catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
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throw new IllegalArgumentException(e);
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}
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}
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}
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