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Code Issues Packages 1 Wiki Activity

fix(ext/crypto): enforce 128bits tagLength for AES-GCM decryption (#13536)

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Divy Srivastava 2022-01-30 18:42:29 +05:30 • committed by GitHub
parent a2e4fa471b
commit efa02ffa2a
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29
cli/tests/unit/webcrypto_test.ts
View file

@ -1639,3 +1639,32 @@ Deno.test(async function testAESWrapKey() {
assertEquals(new Uint8Array(hmacKeyBytes), new Uint8Array(unwrappedKeyBytes));
});
// https://github.com/denoland/deno/issues/13534
Deno.test(async function testAesGcmTagLength() {
const key = await crypto.subtle.importKey(
"raw",
new Uint8Array(32),
"AES-GCM",
false,
["encrypt", "decrypt"],
);
const iv = crypto.getRandomValues(new Uint8Array(12));
// encrypt won't fail, it will simply truncate the tag
// as expected.
const encrypted = await crypto.subtle.encrypt(
{ name: "AES-GCM", iv, tagLength: 96, additionalData: new Uint8Array() },
key,
new Uint8Array(32),
);
await assertRejects(async () => {
await crypto.subtle.decrypt(
{ name: "AES-GCM", iv, tagLength: 96, additionalData: new Uint8Array() },
key,
encrypted,
);
});
});

9
ext/crypto/decrypt.rs
View file

@ -295,10 +295,19 @@ fn decrypt_aes_gcm(
return Err(type_error("iv length not equal to 12"));
}
// The `aes_gcm` crate only supports 128 bits tag length.
//
// Note that encryption won't fail, it instead truncates the tag
// to the specified tag length as specified in the spec.
if tag_length != 128 {
return Err(type_error("tag length not equal to 128"));
}
let nonce = Nonce::from_slice(&iv);
let sep = data.len() - (tag_length / 8);
let tag = &data[sep..];
// The actual ciphertext, called plaintext because it is reused in place.
let mut plaintext = data[..sep].to_vec();
match length {