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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/fido/fido_parsing_utils.h"
#include "base/check_op.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/stringprintf.h"
namespace device {
namespace fido_parsing_utils {
namespace {
constexpr bool AreSpansDisjoint(base::span<const uint8_t> lhs,
base::span<const uint8_t> rhs) {
return lhs.data() + lhs.size() <= rhs.data() || // [lhs)...[rhs)
rhs.data() + rhs.size() <= lhs.data(); // [rhs)...[lhs)
}
} // namespace
const char kEs256[] = "ES256";
std::vector<uint8_t> Materialize(base::span<const uint8_t> span) {
return std::vector<uint8_t>(span.begin(), span.end());
}
base::Optional<std::vector<uint8_t>> MaterializeOrNull(
base::Optional<base::span<const uint8_t>> span) {
if (span)
return Materialize(*span);
return base::nullopt;
}
void Append(std::vector<uint8_t>* target, base::span<const uint8_t> in_values) {
CHECK(AreSpansDisjoint(*target, in_values));
target->insert(target->end(), in_values.begin(), in_values.end());
}
std::vector<uint8_t> Extract(base::span<const uint8_t> span,
size_t pos,
size_t length) {
return Materialize(ExtractSpan(span, pos, length));
}
base::span<const uint8_t> ExtractSpan(base::span<const uint8_t> span,
size_t pos,
size_t length) {
if (!(pos <= span.size() && length <= span.size() - pos))
return base::span<const uint8_t>();
return span.subspan(pos, length);
}
std::vector<uint8_t> ExtractSuffix(base::span<const uint8_t> span, size_t pos) {
return Materialize(ExtractSuffixSpan(span, pos));
}
base::span<const uint8_t> ExtractSuffixSpan(base::span<const uint8_t> span,
size_t pos) {
if (pos > span.size())
return std::vector<uint8_t>();
return span.subspan(pos);
}
std::vector<base::span<const uint8_t>> SplitSpan(base::span<const uint8_t> span,
size_t max_chunk_size) {
DCHECK_NE(0u, max_chunk_size);
std::vector<base::span<const uint8_t>> chunks;
const size_t num_chunks = (span.size() + max_chunk_size - 1) / max_chunk_size;
chunks.reserve(num_chunks);
while (!span.empty()) {
const size_t chunk_size = std::min(span.size(), max_chunk_size);
chunks.emplace_back(span.subspan(0, chunk_size));
span = span.subspan(chunk_size);
}
return chunks;
}
std::array<uint8_t, crypto::kSHA256Length> CreateSHA256Hash(
base::StringPiece data) {
std::array<uint8_t, crypto::kSHA256Length> hashed_data;
crypto::SHA256HashString(data, hashed_data.data(), hashed_data.size());
return hashed_data;
}
base::StringPiece ConvertToStringPiece(base::span<const uint8_t> data) {
return {reinterpret_cast<const char*>(data.data()), data.size()};
}
std::string ConvertBytesToUuid(base::span<const uint8_t, 16> bytes) {
uint64_t most_significant_bytes = 0;
for (size_t i = 0; i < sizeof(uint64_t); i++) {
most_significant_bytes |= base::strict_cast<uint64_t>(bytes[i])
<< 8 * (7 - i);
}
uint64_t least_significant_bytes = 0;
for (size_t i = 0; i < sizeof(uint64_t); i++) {
least_significant_bytes |= base::strict_cast<uint64_t>(bytes[i + 8])
<< 8 * (7 - i);
}
return base::StringPrintf(
"%08x-%04x-%04x-%04x-%012llx",
static_cast<unsigned int>(most_significant_bytes >> 32),
static_cast<unsigned int>((most_significant_bytes >> 16) & 0x0000ffff),
static_cast<unsigned int>(most_significant_bytes & 0x0000ffff),
static_cast<unsigned int>(least_significant_bytes >> 48),
least_significant_bytes & 0x0000ffff'ffffffffULL);
}
} // namespace fido_parsing_utils
} // namespace device
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