在Node.js中使用Crypto时的错误处理

Question

我使用Node.js的Crypto库进行加密/解密,如下所示:

    encrypt = function(text, passPhrase){
        var cipher = crypto.createCipher('AES-128-CBC-HMAC-SHA1', passPhrase);
        var crypted = cipher.update(text,'utf8','hex');
        crypted += cipher.final('hex');
        return crypted;
    } ,

    decrypt = function(text, passPhrase){
        var decipher = crypto.createDecipher('AES-128-CBC-HMAC-SHA1', passPhrase)
        var dec = decipher.update(text,'hex','utf8')
        dec += decipher.final('utf8');
        return dec;
    }

加密部分没有问题.如果我发送正确的passPhrase进行解密,也没有问题.我的问题是,如果我发送'错误'的passPhrase进行解密,代码中断并抛出错误:

TypeError: Bad input string
    at Decipher.Cipher.update (crypto.js:279:27)
    at module.exports.decrypt (/xxxx/yyyyy/jjj/ssss/encryptionService.js:19:28)
    at Object.module.exports.passwordDecryptor (/xxxx/yyyyy/jjj/ssss/encryptionService.js:59:56)
    at Object.<anonymous> (/xxxx/yyyyy/jjj/ssss/test.js:32:33)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)

我不希望它发生.我想要例如decrypt函数返回'Passpharse是错误的'句子.根据文档输入链接描述,这里 createDecipher 函数不接受回调函数.

Answer 1

我用try和catch解决了这个问题.(回调函数不起作用.)

 decrypt = function(text, passPhrase){
        var decipher = crypto.createDecipher('AES-128-CBC-HMAC-SHA1', passPhrase);
        try {
            var dec = decipher.update(text,'hex','utf8');
            dec += decipher.final('utf8');
            return dec;
        } catch (ex) {
            console.log('failed');
            return;
        }
    }