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LibWeb: Add the Web::Crypto namespace, built-in, and getRandomValues

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Since we don't support IDL typedefs or unions yet, the responsibility
of verifying the type of the argument is temporarily moved from the
generated Wrapper to the implementation.
This commit is contained in:
Idan Horowitz 2021-09-30 20:02:55 +03:00 • committed by Andreas Kling
parent becbb0ea97
commit 2c6c9b73c8
12 changed files with 129 additions and 10 deletions
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37
Userland/Libraries/LibWeb/Crypto/Crypto.cpp Normal file
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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Random.h>
#include <LibJS/Runtime/TypedArray.h>
#include <LibWeb/Bindings/Wrapper.h>
#include <LibWeb/Crypto/Crypto.h>
namespace Web::Crypto {
DOM::ExceptionOr<JS::Value> Crypto::get_random_values(JS::Value array) const
{
// 1. If array is not an Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array, then throw a TypeMismatchError and terminate the algorithm.
if (!array.is_object() || !(is<JS::Int8Array>(array.as_object()) || is<JS::Uint8Array>(array.as_object()) || is<JS::Uint8ClampedArray>(array.as_object()) || is<JS::Int16Array>(array.as_object()) || is<JS::Uint16Array>(array.as_object()) || is<JS::Int32Array>(array.as_object()) || is<JS::Uint32Array>(array.as_object()) || is<JS::BigInt64Array>(array.as_object()) || is<JS::BigUint64Array>(array.as_object())))
return DOM::TypeMismatchError::create("array must be one of Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array");
auto& typed_array = static_cast<JS::TypedArrayBase&>(array.as_object());
// 2. If the byteLength of array is greater than 65536, throw a QuotaExceededError and terminate the algorithm.
if (typed_array.byte_length() > 65536)
return DOM::QuotaExceededError::create("array's byteLength may not be greater than 65536");
// IMPLEMENTATION DEFINED: If the viewed array buffer is detached, throw a InvalidStateError and terminate the algorithm.
if (typed_array.viewed_array_buffer()->is_detached())
return DOM::InvalidStateError::create("array is detached");
// FIXME: Handle SharedArrayBuffers
// 3. Overwrite all elements of array with cryptographically strong random values of the appropriate type.
fill_with_random(typed_array.viewed_array_buffer()->buffer().data(), typed_array.viewed_array_buffer()->buffer().size());
// 4. Return array.
return array;
}
}