JS与Python AES解密代码转换:为何Python代码报错“binascii.Error: Invalid base64-encoded string”?

js与python aes解密代码转换问题及解决方案

本文分析一个JS AES解密代码转换为Python代码后报错的问题。JS代码运行正常,但Python代码抛出binascii.Error: Invalid base64-encoded string: number of data characters (1053) cannot be 1 more than a multiple of 4错误。

JS与Python AES解密代码转换:为何Python代码报错“binascii.Error: Invalid base64-encoded string”?

问题根源:Base64编码长度差异

错误信息提示Base64编码字符串长度不符合规范。JS和Python在处理Base64编码时,可能存在细微差异,导致最终编码结果长度不同。这通常与填充(padding)有关。Base64编码的长度总是4的倍数,不足时会用=进行填充。如果JS代码在编码过程中自动处理了填充,而Python代码没有,就会导致解码失败。

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JS代码:

const crypto = require('crypto');function m(e) {    return crypto.createHash('md5').update(e).digest();}let o = 'ydsecret://query/key/b*rgygvywfnbwpmbazg*wt7sioup2t0c9whmzn39j^dadazhanxvgccy6vyfwnhl';let n = 'ydsecret://query/iv/c@lze2yzhtz2cygaxksvfsb7y4qwhjitppz0nqp87fbej!iv6v^6fvi2wn@bypj4';function decode(t) {    if (!t) return null;    const a = Buffer.alloc(16, m(o));    const r = Buffer.alloc(16, m(n));    const i = crypto.createDecipheriv('aes-128-cbc', a, r);    let s = i.update(t, 'base64', 'utf-8');    s += i.final('utf-8');    return s;}let t = 'z21kd9zk1ke6ugku2ccwu4n6elnvodt0yggi0y3g-v0b9syqg8l9d6uernozyohqnydl2efznym6trc_xs-zktftk4hb6jp8xwcznh0avc8qitquiiu_4wkkxjlipvmvfkvjaazzax6vetpkr2fdkfot_jgbm2grsvj3r40autidlimeng8hc0zh4ww7utwutt3oo_zpxg0bsq9wepsab75-chkigkf9htipecl2bl84sbd1xdffczpkkqhecyss0jloxoqp2ltavxrrg58hp1q5uigzz_oo2-jmd-t1r4es40drcaq5bjms62m2vjf8d6ojtoh9jtfnwgzd3cxyn-pd7-tghmynejekfxtayxzpjlfqtrcyde3szuylenkqsl8wrra1hm-1ntfib-blcwadrbynnpp5_54aq_-gbsq8bb_9yex5ovzdb4_ry_spvvuunb39iplmhcdcnjod3ngiidbl9suz-9npjbx05zyrdpmfpal424qdoaxevqnvoh8jqfpzvqahmzu4mjg0sicdwfh7gp1zqgrbxd3esjt_ibinl3gict2xvuhh_nubcelktec6xbqedrqkpunmpzxjhjcvslhtcmsw0s9f0445ho9kt2qzydmbc3fs0oahputfu77gzpqn7sgiqh8vlixicutfvvop-1c-vu5qjfubln2-s5por9fgyg6rt6ioe_pgmwwj-cc00zum7fybfarktr4d3rk57r72qpxn4ja86zscammdg-m5z31rqh_v7echj8kna3go3ywkck4vtswowrfhis5rtz6ekrgc3skfkbb5vp8wop_84mybtgnbmj4cczhtq2hcoxrjf4def6ydt2ubxyv4btvgx9yx3ub4gx0ik5kyvfma6b_lnkrwk331wjuxkqtbgyiuwkr8j5qtvbmirvaa7aa19z4xmieaqbcuq5p4i9fcelthbrjd9yocouhk4u27xxywjjxcjotvzg7zwtiv76fhdeqlgawvjj7ww4nfgjhqc6aka_2afxa4c_lavvzgfukl3xscl7pfkxp6ghjcgkesrr80pt1gffw2xi8x4ejjnm_prsuz';console.log(decode(t));

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