我想执行基本的 AES-CBC 解密。我有字符串encData
使用 128 位密钥加密rawKey
,初始化向量defaultIV
为零。我只想使用 Web Crypto API,而不使用第三方库。可以做吗?
window.crypto.subtle.decrypt
Web Crypto API 的使用时抛出异常:DOMException
(没有更多信息)在 Chromium 和OperationError: The operation failed for an operation-specific reason
在火狐浏览器中。
到底是什么问题呢?
密钥和加密数据没问题,我已经在在线解密中检查过它(使用控制台输出中的十六进制字符串)。
代码:
!async function script() {
// ArrayBuffer to Hex String. https://stackoverflow.com/a/40031979/11468937
function buf2hex(buffer) {
return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('');
}
const defaultIV = new Uint8Array(16);
const rawKey = new Uint8Array([42, 40, 254, 9, 99, 201, 174, 52, 226, 21, 90, 155, 81, 50, 2, 9]);
const encData = new Uint8Array([102, 80, 220, 73, 185, 233, 85, 7, 195, 196, 137, 107, 65, 150, 162, 161, 80, 82, 26, 18, 110, 247, 189, 176, 35, 197, 140, 4, 138, 75, 159, 197, 75, 88, 131, 23, 235, 125, 96, 81, 41, 170, 220, 45, 64, 55, 30, 68, 39, 6, 112, 194, 243, 209, 177, 173, 54, 71, 21, 172, 62, 147, 112, 76]);
console.log("defaultIV\n", defaultIV, buf2hex(defaultIV));
console.log("rawKey\n", rawKey, buf2hex(rawKey));
console.log("encData\n", encData, buf2hex(encData));
const key = await crypto.subtle.importKey(
"raw",
rawKey,
"AES-CBC",
true,
["decrypt"]
);
console.log("key", key);
// It throws "Uncaught (in promise) DOMException"
const decrypted = await crypto.subtle.decrypt(
{
name: "AES-CBC",
iv: defaultIV
},
key,
encData
);
console.log("decrypted", decrypted);
}();