Webcrypto AES-CBC解密:操作错误-由于特定于操作的原因,操作失败

时间:2018-07-04 11:24:01

标签: javascript webcryptoapi

我具有以下代码,可使用Javascript Webcrypto-API解密AES加密的数据,但会导致“ OperationError”和消息“操作因特定于操作的原因而失败”:

function loadHexToArrybuffer(hex)
{
	return new Uint8Array(hex.match(/[\da-f]{2}/gi).map(h => parseInt(h, 16)));
}

var iv = loadHexToArrybuffer("47b79d24e3ec47c528abdaed8f3fafde");
var rawKey = loadHexToArrybuffer("8af4d72873e4016cd73a1d5b851e9cb2");
var encryptedData = loadHexToArrybuffer("2bb7a12a7e59f9fa3c3d4ff0eb502cde3187338cc3137af785995b364fc5b3fe9c208f225c7472bb3de55de18a665863f63030d652b870c4610a70bc771e8bc584df7c3bd2ce3fc1940115e556178e740891f7cac450204a4959916ac9c9cd5aedd92cc7e74a7a581a6d47a6c29fb46eee13ffd3f70616844f8e2bb929c60ad9")

async function test()
{
	var algorithm = {name: "AES-CBC", iv: iv};
	var key = await window.crypto.subtle.importKey("raw", rawKey, algorithm, false, ["decrypt"]);

	try
	{
		var decrypted = await window.crypto.subtle.decrypt(algorithm, key, encryptedData);
	}
	catch (e)
	{
		console.log(e); // OperationError: The operation failed for an operation-specific reason
	}
}

test();

有人可以帮我吗?谢谢你!

1 个答案:

答案 0 :(得分:0)

您未说明要使用的浏览器和版本,每个版本支持一组不同的算法。

如果要快速测试每种支持的内容,请参见:https://peculiarventures.github.io/pv-webcrypto-tests/

话虽如此,我首先想到的是,除非有必要与仅使用CBC的现有系统实现互操作性,否则我不会使用CBC。您应该改用AES-GCM,它是一种经过身份验证的加密模式,可以防止普通CBC不会进行的某些攻击,并且使用时不易出错。

这是GCM的加密示例:

window.crypto.subtle.encrypt(
    {
        name: "AES-GCM",

        //Don't re-use initialization vectors!
        //Always generate a new iv every time your encrypt!
        //Recommended to use 12 bytes length
        iv: window.crypto.getRandomValues(new Uint8Array(12)),

        //Additional authentication data (optional)
        additionalData: ArrayBuffer,

        //Tag length (optional)
        tagLength: 128, //can be 32, 64, 96, 104, 112, 120 or 128 (default)
    },
    key, //from generateKey or importKey above
    data //ArrayBuffer of data you want to encrypt
)
.then(function(encrypted){
    //returns an ArrayBuffer containing the encrypted data
    console.log(new Uint8Array(encrypted));
})
.catch(function(err){
    console.error(err);
});

如果您需要使用CBC,以下是一些用法示例:https://github.com/diafygi/webcrypto-examples#aes-cbc