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/*
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCrypto/Hash/HashManager.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/Promise.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Crypto/SubtleCrypto.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/DOMException.h>
namespace Web::Crypto {
JS::NonnullGCPtr<SubtleCrypto> SubtleCrypto::create(JS::Realm& realm)
{
return *realm.heap().allocate<SubtleCrypto>(realm, realm);
}
SubtleCrypto::SubtleCrypto(JS::Realm& realm)
: PlatformObject(realm)
{
set_prototype(&Bindings::cached_web_prototype(realm, "SubtleCrypto"));
}
SubtleCrypto::~SubtleCrypto() = default;
// https://w3c.github.io/webcrypto/#dfn-SubtleCrypto-method-digest
JS::Promise* SubtleCrypto::digest(String const& algorithm, JS::Handle<JS::Object> const& data)
{
auto& realm = this->realm();
// 1. Let algorithm be the algorithm parameter passed to the digest() method.
// 2. Let data be the result of getting a copy of the bytes held by the data parameter passed to the digest() method.
auto data_buffer_or_error = WebIDL::get_buffer_source_copy(*data.cell());
if (data_buffer_or_error.is_error()) {
auto error = WebIDL::OperationError::create(realm, "Failed to copy bytes from ArrayBuffer");
auto* promise = JS::Promise::create(realm);
promise->reject(error.ptr());
return promise;
}
auto& data_buffer = data_buffer_or_error.value();
// 3. Let normalizedAlgorithm be the result of normalizing an algorithm, with alg set to algorithm and op set to "digest".
// FIXME: This is way more generic than it needs to be right now, so we simplify it.
::Crypto::Hash::HashKind hash_kind;
if (algorithm.equals_ignoring_case("SHA-1"sv)) {
hash_kind = ::Crypto::Hash::HashKind::SHA1;
} else if (algorithm.equals_ignoring_case("SHA-256"sv)) {
hash_kind = ::Crypto::Hash::HashKind::SHA256;
} else if (algorithm.equals_ignoring_case("SHA-384"sv)) {
hash_kind = ::Crypto::Hash::HashKind::SHA384;
} else if (algorithm.equals_ignoring_case("SHA-512"sv)) {
hash_kind = ::Crypto::Hash::HashKind::SHA512;
}
// 4. If an error occurred, return a Promise rejected with normalizedAlgorithm.
else {
auto error = WebIDL::NotSupportedError::create(realm, String::formatted("Invalid hash function '{}'", algorithm));
auto* promise = JS::Promise::create(realm);
promise->reject(error.ptr());
return promise;
}
// 5. Let promise be a new Promise.
auto* promise = JS::Promise::create(realm);
// 6. Return promise and perform the remaining steps in parallel.
// FIXME: We don't have a good abstraction for this yet, so we do it in sync.
// 7. If the following steps or referenced procedures say to throw an error, reject promise with the returned error and then terminate the algorithm.
// 8. Let result be the result of performing the digest operation specified by normalizedAlgorithm using algorithm, with data as message.
::Crypto::Hash::Manager hash { hash_kind };
hash.update(data_buffer);
auto digest = hash.digest();
auto result_buffer = ByteBuffer::copy(digest.immutable_data(), hash.digest_size());
if (result_buffer.is_error()) {
auto error = WebIDL::OperationError::create(realm, "Failed to create result buffer");
promise->reject(error.ptr());
return promise;
}
auto* result = JS::ArrayBuffer::create(realm, result_buffer.release_value());
// 9. Resolve promise with result.
promise->fulfill(result);
return promise;
}
}
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