123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139 |
- /*
- * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
- * Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Random.h>
- #include <AK/StringBuilder.h>
- #include <LibJS/Runtime/TypedArray.h>
- #include <LibWeb/Bindings/ExceptionOrUtils.h>
- #include <LibWeb/Bindings/Intrinsics.h>
- #include <LibWeb/Crypto/Crypto.h>
- #include <LibWeb/Crypto/SubtleCrypto.h>
- #include <LibWeb/WebIDL/Buffers.h>
- namespace Web::Crypto {
- JS_DEFINE_ALLOCATOR(Crypto);
- JS::NonnullGCPtr<Crypto> Crypto::create(JS::Realm& realm)
- {
- return realm.heap().allocate<Crypto>(realm, realm);
- }
- Crypto::Crypto(JS::Realm& realm)
- : PlatformObject(realm)
- {
- }
- Crypto::~Crypto() = default;
- void Crypto::initialize(JS::Realm& realm)
- {
- Base::initialize(realm);
- WEB_SET_PROTOTYPE_FOR_INTERFACE(Crypto);
- m_subtle = SubtleCrypto::create(realm);
- }
- JS::NonnullGCPtr<SubtleCrypto> Crypto::subtle() const
- {
- return *m_subtle;
- }
- // https://w3c.github.io/webcrypto/#dfn-Crypto-method-getRandomValues
- WebIDL::ExceptionOr<JS::Handle<WebIDL::ArrayBufferView>> Crypto::get_random_values(JS::Handle<WebIDL::ArrayBufferView> 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_typed_array_base())
- return WebIDL::TypeMismatchError::create(realm(), "array must be one of Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array"_fly_string);
- auto const& typed_array = *array->bufferable_object().get<JS::NonnullGCPtr<JS::TypedArrayBase>>();
- auto typed_array_record = JS::make_typed_array_with_buffer_witness_record(typed_array, JS::ArrayBuffer::Order::SeqCst);
- // IMPLEMENTATION DEFINED: If the viewed array buffer is out-of-bounds, throw a InvalidStateError and terminate the algorithm.
- if (JS::is_typed_array_out_of_bounds(typed_array_record))
- return WebIDL::InvalidStateError::create(realm(), MUST(String::formatted(JS::ErrorType::BufferOutOfBounds.message(), "TypedArray"sv)));
- // 2. If the byteLength of array is greater than 65536, throw a QuotaExceededError and terminate the algorithm.
- if (JS::typed_array_byte_length(typed_array_record) > 65536)
- return WebIDL::QuotaExceededError::create(realm(), "array's byteLength may not be greater than 65536"_fly_string);
- // FIXME: Handle SharedArrayBuffers
- // 3. Overwrite all elements of array with cryptographically strong random values of the appropriate type.
- fill_with_random(array->viewed_array_buffer()->buffer());
- // 4. Return array.
- return array;
- }
- // https://w3c.github.io/webcrypto/#dfn-Crypto-method-randomUUID
- WebIDL::ExceptionOr<String> Crypto::random_uuid() const
- {
- auto& vm = realm().vm();
- return TRY_OR_THROW_OOM(vm, generate_random_uuid());
- }
- void Crypto::visit_edges(Cell::Visitor& visitor)
- {
- Base::visit_edges(visitor);
- visitor.visit(m_subtle);
- }
- // https://w3c.github.io/webcrypto/#dfn-generate-a-random-uuid
- ErrorOr<String> generate_random_uuid()
- {
- // 1. Let bytes be a byte sequence of length 16.
- u8 bytes[16];
- // 2. Fill bytes with cryptographically secure random bytes.
- fill_with_random(bytes);
- // 3. Set the 4 most significant bits of bytes[6], which represent the UUID version, to 0100.
- bytes[6] &= ~(1 << 7);
- bytes[6] |= 1 << 6;
- bytes[6] &= ~(1 << 5);
- bytes[6] &= ~(1 << 4);
- // 4. Set the 2 most significant bits of bytes[8], which represent the UUID variant, to 10.
- bytes[8] |= 1 << 7;
- bytes[8] &= ~(1 << 6);
- /* 5. Return the string concatenation of
- «
- hexadecimal representation of bytes[0],
- hexadecimal representation of bytes[1],
- hexadecimal representation of bytes[2],
- hexadecimal representation of bytes[3],
- "-",
- hexadecimal representation of bytes[4],
- hexadecimal representation of bytes[5],
- "-",
- hexadecimal representation of bytes[6],
- hexadecimal representation of bytes[7],
- "-",
- hexadecimal representation of bytes[8],
- hexadecimal representation of bytes[9],
- "-",
- hexadecimal representation of bytes[10],
- hexadecimal representation of bytes[11],
- hexadecimal representation of bytes[12],
- hexadecimal representation of bytes[13],
- hexadecimal representation of bytes[14],
- hexadecimal representation of bytes[15]
- ».
- */
- StringBuilder builder;
- TRY(builder.try_appendff("{:02x}{:02x}{:02x}{:02x}-", bytes[0], bytes[1], bytes[2], bytes[3]));
- TRY(builder.try_appendff("{:02x}{:02x}-", bytes[4], bytes[5]));
- TRY(builder.try_appendff("{:02x}{:02x}-", bytes[6], bytes[7]));
- TRY(builder.try_appendff("{:02x}{:02x}-", bytes[8], bytes[9]));
- TRY(builder.try_appendff("{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}", bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15]));
- return builder.to_string();
- }
- }
|