35 lines
913 B
JavaScript
35 lines
913 B
JavaScript
var crypto = require("crypto");
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function WXBizDataCrypt(appId, sessionKey) {
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this.appId = appId;
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this.sessionKey = sessionKey;
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}
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WXBizDataCrypt.prototype.decryptData = function (encryptedData, iv) {
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// base64 decode
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var sessionKey = new Buffer(this.sessionKey, "base64");
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encryptedData = new Buffer(encryptedData, "base64");
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iv = new Buffer(iv, "base64");
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try {
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// 解密
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var decipher = crypto.createDecipheriv("aes-128-cbc", sessionKey, iv);
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// 设置自动 padding 为 true，删除填充补位
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decipher.setAutoPadding(true);
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var decoded = decipher.update(encryptedData, "binary", "utf8");
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decoded += decipher.final("utf8");
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decoded = JSON.parse(decoded);
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} catch (err) {
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throw new Error("Illegal Buffer");
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}
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if (decoded.watermark.appid !== this.appId) {
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throw new Error("Illegal Buffer");
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}
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return decoded;
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};
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module.exports = WXBizDataCrypt;
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