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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/extensions/api/platform_keys_natives.h"
#include <memory>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/values.h"
#include "extensions/renderer/script_context.h"
#include "gin/data_object_builder.h"
#include "third_party/blink/public/platform/web_crypto_algorithm.h"
#include "third_party/blink/public/platform/web_crypto_algorithm_params.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/public/web/web_crypto_normalize.h"
namespace extensions {
namespace {
bool StringToWebCryptoOperation(const std::string& str,
blink::WebCryptoOperation* op) {
if (str == "GenerateKey") {
*op = blink::kWebCryptoOperationGenerateKey;
return true;
}
if (str == "ImportKey") {
*op = blink::kWebCryptoOperationImportKey;
return true;
}
if (str == "Sign") {
*op = blink::kWebCryptoOperationSign;
return true;
}
if (str == "Verify") {
*op = blink::kWebCryptoOperationVerify;
return true;
}
return false;
}
v8::Local<v8::Object> WebCryptoAlgorithmToV8Value(
const blink::WebCryptoAlgorithm& algorithm,
v8::Local<v8::Context> context) {
DCHECK(!algorithm.IsNull());
v8::Context::Scope scope(context);
v8::Isolate* isolate = context->GetIsolate();
const blink::WebCryptoAlgorithmInfo* info =
blink::WebCryptoAlgorithm::LookupAlgorithmInfo(algorithm.Id());
gin::DataObjectBuilder builder(isolate);
builder.Set("name", std::string_view(info->name));
const blink::WebCryptoAlgorithm* hash = nullptr;
switch (algorithm.Id()) {
case blink::kWebCryptoAlgorithmIdRsaSsaPkcs1v1_5:
case blink::kWebCryptoAlgorithmIdRsaOaep: {
const blink::WebCryptoRsaHashedKeyGenParams* rsa_hashed_key_gen =
algorithm.RsaHashedKeyGenParams();
if (rsa_hashed_key_gen) {
builder.Set("modulusLength", rsa_hashed_key_gen->ModulusLengthBits());
const std::vector<unsigned char>& public_exponent =
rsa_hashed_key_gen->PublicExponent();
v8::Local<v8::ArrayBuffer> buffer =
v8::ArrayBuffer::New(isolate, public_exponent.size());
UNSAFE_TODO(memcpy(buffer->GetBackingStore()->Data(),
public_exponent.data(), public_exponent.size()));
builder.Set("publicExponent", buffer);
hash = &rsa_hashed_key_gen->GetHash();
DCHECK(!hash->IsNull());
}
const blink::WebCryptoRsaHashedImportParams* rsa_hashed_import =
algorithm.RsaHashedImportParams();
if (rsa_hashed_import) {
hash = &rsa_hashed_import->GetHash();
DCHECK(!hash->IsNull());
}
break;
}
case blink::kWebCryptoAlgorithmIdEcdsa: {
const blink::WebCryptoEcKeyGenParams* ec_key_gen =
algorithm.EcKeyGenParams();
if (ec_key_gen) {
std::string_view named_curve;
switch (ec_key_gen->NamedCurve()) {
case blink::kWebCryptoNamedCurveP256:
named_curve = "P-256";
break;
case blink::kWebCryptoNamedCurveP384:
named_curve = "P-384";
break;
case blink::kWebCryptoNamedCurveP521:
named_curve = "P-521";
break;
}
DCHECK(!named_curve.empty());
builder.Set("namedCurve", named_curve);
}
const blink::WebCryptoEcdsaParams* ecdsa = algorithm.EcdsaParams();
if (ecdsa) {
hash = &ecdsa->GetHash();
DCHECK(!hash->IsNull());
}
break;
}
default: {
break;
}
}
if (hash) {
const blink::WebCryptoAlgorithmInfo* hash_info =
blink::WebCryptoAlgorithm::LookupAlgorithmInfo(hash->Id());
builder.Set("hash", gin::DataObjectBuilder(isolate)
.Set("name", std::string_view(hash_info->name))
.Build());
}
// Otherwise, |algorithm| is missing support here or no parameters were
// required.
return builder.Build();
}
} // namespace
PlatformKeysNatives::PlatformKeysNatives(ScriptContext* context)
: ObjectBackedNativeHandler(context) {}
void PlatformKeysNatives::AddRoutes() {
RouteHandlerFunction(
"NormalizeAlgorithm",
base::BindRepeating(&PlatformKeysNatives::NormalizeAlgorithm,
base::Unretained(this)));
}
void PlatformKeysNatives::NormalizeAlgorithm(
const v8::FunctionCallbackInfo<v8::Value>& call_info) {
DCHECK_EQ(call_info.Length(), 2);
DCHECK(call_info[0]->IsObject());
DCHECK(call_info[1]->IsString());
blink::WebCryptoOperation operation;
if (!StringToWebCryptoOperation(
*v8::String::Utf8Value(call_info.GetIsolate(), call_info[1]),
&operation)) {
return;
}
blink::WebCryptoAlgorithm algorithm =
blink::NormalizeCryptoAlgorithm(v8::Local<v8::Object>::Cast(call_info[0]),
operation, call_info.GetIsolate());
if (algorithm.IsNull()) {
return;
}
call_info.GetReturnValue().Set(
WebCryptoAlgorithmToV8Value(algorithm, context()->v8_context()));
}
} // namespace extensions
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