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jwk key support for aesjs

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This commit is contained in:
Bruno Windels 2020-10-27 13:21:12 +01:00
parent a3aa25449b
commit a61d7fc68a
1 changed files with 22 additions and 13 deletions
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35
src/platform/web/dom/Crypto.js
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@ -158,8 +158,8 @@ class AESCrypto {
}
/**
* [decrypt description]
* @param {string} keyFormat "raw" or "jwk"
* @param {BufferSource | Object} key [description]
* @param {BufferSource} key [description]
* @param {Object} jwkKey [description]
* @param {BufferSource} iv [description]
* @param {BufferSource} data [description]
* @param {Number} counterLength the size of the counter, in bits
@ -200,6 +200,8 @@ class AESCrypto {
}
import base64 from "../../../../lib/base64-arraybuffer/index.js";
class AESLegacyCrypto {
constructor(aesjs) {
this._aesjs = aesjs;
@ -213,18 +215,25 @@ class AESLegacyCrypto {
* @return {BufferSource} [description]
*/
async decryptCTR({key, jwkKey, iv, data, counterLength = 64}) {
// TODO: support counterLength and jwkKey
const aesjs = this._aesjs;
// This won't work as aesjs throws with iv.length !== 16
// const nonceLength = 8;
// const expectedIVLength = (counterLength / 8) + nonceLength;
// if (iv.length < expectedIVLength) {
// const newIV = new Uint8Array(expectedIVLength);
// for(let i = 0; i < iv.length; ++i) {
// newIV[i] = iv[i];
// }
// iv = newIV;
// }
if (counterLength !== 64) {
throw new Error(`Unsupported counter length: ${counterLength}`);
}
if (jwkKey) {
if (jwkKey.alg !== "A256CTR") {
throw new Error(`Unknown algorithm: ${jwkKey.alg}`);
}
if (!jwkKey.key_ops.includes("decrypt")) {
throw new Error(`decrypt missing from key_ops`);
}
if (jwkKey.kty !== "oct") {
throw new Error(`Invalid key type, "oct" expected: ${jwkKey.kty}`);
}
// need //var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
const base64Key = jwkKey.k.replace(/-/g, "+").replace(/_/g, "/");
key = base64.decode(base64Key);
}
var aesCtr = new aesjs.ModeOfOperation.ctr(new Uint8Array(key), new aesjs.Counter(new Uint8Array(iv)));
return aesCtr.decrypt(new Uint8Array(data));
}