如何在Nodejs中使用Crypto对二进制数据进行加解密

Question

我有一个新的使用加密加密音频数据在NodeJs。当我试图解密数据时，我得到了一些错误输出。这是我的测试代码。

function encrypt (buf, key) {
    const cipher = crypto.createCipheriv('des-ecb', key, new Buffer(0))
    let c = cipher.update(Buffer.from(buf))
    c += cipher.final('binary')
    return c
 }

function decrypt (buf, key) {
    const cipher = crypto.createDecipheriv('des-ecb', key, new Buffer(0))
    let c = cipher.update(buf)
    c += cipher.final('binary')
    return c
}


let pcmbuf = fs.readFileSync("test.pcm")
let enc = encrypt(pcmbuf,gen_key())
let dec = decrypt(enc,gen_key())
fs.writeFileSync('dec.pcm',dec)

当我运行这段代码时，它产生了一个错误。细节看起来就像是贝洛特。

internal/crypto/cipher.js:104
  var ret = this._handle.final();
                         ^

Error: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length
    at Decipheriv.final (internal/crypto/cipher.js:104:26)
    at decrypt (/home/zsc/asr-js/test.js:60:17)
    at Object.<anonymous> (/home/zsc/asr-js/test.js:67:11)
    at Module._compile (module.js:660:30)
    at Object.Module._extensions..js (module.js:671:10)
    at Module.load (module.js:573:32)
    at tryModuleLoad (module.js:513:12)
    at Function.Module._load (module.js:505:3)
    at Function.Module.runMain (module.js:701:10)
    at startup (bootstrap_node.js:190:16)

我怎么才能解决这个问题。谢谢你回答我的问题！

Answer 1

显然，问题出在不同语言的加密/解密的padding...because上……答案是node.js github问题页面上的here。

引用答案

因此，在创建

实例后调用decrypt.setAutoPadding(false);将使其正常工作：

var crypto = require('crypto');

//the encrypted result
var theCipher = "ccZmMULq3tlzAY+iafZz+96xz+qFsAuGpEjhN7CckJTcdBT03fgobfSVGCGYzILyPNSA3e3msUqHUTCpv8kRnWvFdLv9c+GTEhg+Lj5dOThGDHtkQX2j5bd6Eubw9/l+Lcwj0PeyW0ZoVkB5Nnp1yCnmKAn2Euliq+IurgthT+wln6cQmTjXfL4IB5VxwUEb72FcbeiCfbKxa+MxxbcQTCpli3ErSptwdp9on2k87JTPFqyyMmMRFA9VgOXpHNe43IwFzME01DyHZ+Rp/eQguTmY9FtkFIZeD2e2nrbbDbW6tlk/KOtdhGVIlIGMPNS5m8LYqlrGZlJU3JythEy+J0z1wW1owjVe9Yto2OtUe8WeKI744enBKAX4FnD4My7+/XRjbF5kf6loT9lqeMCdXFb3LDej3GVcKWbJuZjXmD4="

var key = "abcdefghijklmnopqrstuvwx"

var decrypt = crypto.createDecipheriv('des-ede3', key, "");

//Add the auto padding here....IT HAVE TO BE after creating the decipher immeditely
decrypt.setAutoPadding(false);

var s = decrypt.update(theCipher, 'base64', 'utf8');

console.log(s + decrypt.final('utf8'));

Answer 2

终于来了。我找到了解决那个案子的办法。将二进制编码的字符串作为参数传递，而不是传递buffer。代码如下。

function encrypt (buf, key) {
    const cipher = crypto.createCipheriv('des-ecb', key, new Buffer(0))
    let c = cipher.update(buf,'binary','base64')
    c += cipher.final('base64')
    return c
 }

function decrypt (buf, key) {
    const cipher = crypto.createDecipheriv('des-ecb', key, new Buffer(0))
    let c = cipher.update(buf,'base64','base64')
    c += cipher.final('base64')
    return c
}

let pcmbuf = fs.readFileSync("test.pcm")
let enc = encrypt(pcmbuf.toString('binary'),gen_key())
let dec = decrypt(enc,gen_key())
fs.writeFileSync('dec.pcm',Buffer.from(dec,'base64'))