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https://github.com/LadybirdBrowser/ladybird.git
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b99cc7d050
This is a continuation of the previous two commits. As allocating a JS cell already primarily involves a realm instead of a global object, and we'll need to pass one to the allocate() function itself eventually (it's bridged via the global object right now), the create() functions need to receive a realm as well. The plan is for this to be the highest-level function that actually receives a realm and passes it around, AOs on an even higher level will use the "current realm" concept via VM::current_realm() as that's what the spec assumes; passing around realms (or global objects, for that matter) on higher AO levels is pointless and unlike for allocating individual objects, which may happen outside of regular JS execution, we don't need control over the specific realm that is being used there.
82 lines
3.4 KiB
C++
82 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCrypto/Hash/HashManager.h>
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#include <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/Promise.h>
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#include <LibWeb/Bindings/DOMExceptionWrapper.h>
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#include <LibWeb/Bindings/IDLAbstractOperations.h>
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#include <LibWeb/Bindings/Wrapper.h>
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#include <LibWeb/Crypto/SubtleCrypto.h>
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#include <LibWeb/DOM/DOMException.h>
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namespace Web::Crypto {
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JS::Promise* SubtleCrypto::digest(String const& algorithm, JS::Handle<JS::Object> const& data)
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{
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auto& global_object = wrapper()->global_object();
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auto& realm = *global_object.associated_realm();
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// 1. Let algorithm be the algorithm parameter passed to the digest() method.
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// 2. Let data be the result of getting a copy of the bytes held by the data parameter passed to the digest() method.
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auto data_buffer_or_error = Bindings::IDL::get_buffer_source_copy(*data.cell());
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if (data_buffer_or_error.is_error()) {
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auto* error = wrap(wrapper()->global_object(), DOM::OperationError::create("Failed to copy bytes from ArrayBuffer"));
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auto* promise = JS::Promise::create(realm);
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promise->reject(error);
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return promise;
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}
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auto& data_buffer = data_buffer_or_error.value();
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// 3. Let normalizedAlgorithm be the result of normalizing an algorithm, with alg set to algorithm and op set to "digest".
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// FIXME: This is way more generic than it needs to be right now, so we simplify it.
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::Crypto::Hash::HashKind hash_kind;
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if (algorithm.equals_ignoring_case("SHA-1"sv)) {
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hash_kind = ::Crypto::Hash::HashKind::SHA1;
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} else if (algorithm.equals_ignoring_case("SHA-256"sv)) {
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hash_kind = ::Crypto::Hash::HashKind::SHA256;
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} else if (algorithm.equals_ignoring_case("SHA-384"sv)) {
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hash_kind = ::Crypto::Hash::HashKind::SHA384;
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} else if (algorithm.equals_ignoring_case("SHA-512"sv)) {
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hash_kind = ::Crypto::Hash::HashKind::SHA512;
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}
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// 4. If an error occurred, return a Promise rejected with normalizedAlgorithm.
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else {
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auto* error = wrap(wrapper()->global_object(), DOM::NotSupportedError::create(String::formatted("Invalid hash function '{}'", algorithm)));
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auto* promise = JS::Promise::create(realm);
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promise->reject(error);
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return promise;
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}
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// 5. Let promise be a new Promise.
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auto* promise = JS::Promise::create(realm);
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// 6. Return promise and perform the remaining steps in parallel.
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// FIXME: We don't have a good abstraction for this yet, so we do it in sync.
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// 7. If the following steps or referenced procedures say to throw an error, reject promise with the returned error and then terminate the algorithm.
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// 8. Let result be the result of performing the digest operation specified by normalizedAlgorithm using algorithm, with data as message.
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::Crypto::Hash::Manager hash { hash_kind };
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hash.update(data_buffer);
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auto digest = hash.digest();
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auto result_buffer = ByteBuffer::copy(digest.immutable_data(), hash.digest_size());
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if (result_buffer.is_error()) {
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auto* error = wrap(wrapper()->global_object(), DOM::OperationError::create("Failed to create result buffer"));
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promise->reject(error);
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return promise;
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}
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auto* result = JS::ArrayBuffer::create(realm, result_buffer.release_value());
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// 9. Resolve promise with result.
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promise->fulfill(result);
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return promise;
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}
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}
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