在Crypto中复制SubtleCrypto时出现问题



我有一些代码使用SubtleCrypto加密密钥并将其存储在数据库中。

对于另一个功能,我必须能够在节点12中对其进行加密。如果没有SubtleCrypto,我必须在Crypto中重新创建功能。

我得到了相同大小的输出,但它似乎不可被SubtleCrypto解密,我正在努力找出哪里出了问题。

这是在浏览器上使用SubtleCrypto运行的代码:

key = getKeyMaterial(password)];
salt = base64ToArraybuffer(optionalSalt)
aesKey = crypto.subtle.deriveKey(
{
name: constants.algorithms.pbkdf2,
salt: salt,
iterations: pbkdf2Iterations,
hash: { name: constants.hash.sha256 },
},
key,
{
name: constants.algorithms.aesGcm,
length: aesWrapKeyBitsLength,
},
true,
['wrapKey', 'unwrapKey']
),
return {
salt: arraybufferTobase64(salt),
aesKey: aesKey,
}

function getKeyMaterial(password) {
var enc = new TextEncoder();
crypto.subtle.importKey(
constants.format.raw,
enc.encode(password),
{
name: constants.algorithms.pbkdf2,
},
false,
['deriveKey']
)

如果没有SubtleCrypto,在Node 12中,我将被迫使用Crypto库。。这是我的,代码的当前迭代。

const ivByteLength = 12;
function wrapKey(privateKey, aesKey) {
const IV = crypto.randomBytes(ivByteLength);
const ALGORITHM = 'aes-256-gcm';
const cipher = crypto.createCipheriv(ALGORITHM, aesKey, IV);
let encrypted = cipher.update(privateKey, undefined, 'binary');
encrypted += cipher.final('binary');
const authTag = cipher.getAuthTag();
encrypted += authTag;
const output = {
wrappedKey: arraybufferTobase64(Buffer.from(encrypted, 'ascii')),
iv: arraybufferTobase64(IV),
};
return output;
}
async function deriveAesGcmKey(password, salt) {
return new Promise((resolve, reject) => {
crypto.pbkdf2(password, salt, 100000, 32, 'sha256', (err, derivedKey) => {
if (err) reject(err);
else resolve(derivedKey);
});
});
}
function arraybufferTobase64(buffer) {
let binary = '';
const bytes = new Uint8Array(buffer);
const len = bytes.byteLength;
for (let i = 0; i < len; i += 1) {
binary += String.fromCharCode(bytes[i]);
}
return btoa(binary);
}
function base64ToArraybuffer(base64) {
const binary = atob(base64);
const len = binary.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i += 1) {
bytes[i] = binary.charCodeAt(i);
}
return bytes;
}

包装的键在两个实现中都具有相同的大小,但无法在浏览器中展开Node生成的键。

我是不是认为某些默认值是错误的?

NodeJS在crypto包中有一个名为webcrypto类的东西,它有微妙的加密实现。

文档示例:

const { subtle } = require('crypto').webcrypto;
async function digest(data, algorithm = 'SHA-512') {
const ec = new TextEncoder();
const digest = await subtle.digest(algorithm, ec.encode(data));
return digest;
}

同时查看:https://nodejs.org/api/webcrypto.html#webcrypto_class_subtlecrypto

编辑:

正如在Node较低版本的注释中所说,您可以使用polyfillhttps://www.npmjs.com/package/@special/webcrypto是Nodejs版本高于Node10 的webcrypto实现

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