44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
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import CryptoJS from 'crypto-js';
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import overAllConfig from '@/config.js'
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/**
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* AES-CBC 解密（从 Base64 中提取随机 IV）
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* @param {string} base64Str - 加密后的 Base64 字符串（IV + 密文）
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* @param {string} keyStr - 16 字节密钥字符串
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* @returns {string} 解密后的明文
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*/
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export function decryptJson(encryptedBase64, base64Key = overAllConfig.AESKey) {
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try {
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// 1. Base64 解码密钥 & 数据
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const key = CryptoJS.enc.Base64.parse(base64Key);
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const combinedData = CryptoJS.enc.Base64.parse(encryptedBase64);
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// 2. 提取 IV（前16字节 = 4 个 32bit Word）
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const ivWords = combinedData.words.slice(0, 4);
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const iv = CryptoJS.lib.WordArray.create(ivWords, 16);
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// 3. 提取密文（剩余部分）
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const ciphertextWords = combinedData.words.slice(4);
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const ciphertext = CryptoJS.lib.WordArray.create(
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ciphertextWords,
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combinedData.sigBytes - 16
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);
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// 4. 解密
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const decrypted = CryptoJS.AES.decrypt({
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ciphertext
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}, key, {
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iv: iv,
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mode: CryptoJS.mode.CBC,
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padding: CryptoJS.pad.Pkcs7, // 等价于 Java 的 PKCS5Padding
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});
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const result = decrypted.toString(CryptoJS.enc.Utf8);
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if (!result) throw new Error('解密失败，返回空字符串（可能密钥错误或格式错误）');
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return result;
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} catch (e) {
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console.error('解密失败:', e);
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return '';
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}
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}
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