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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/payments/content/utility/fingerprint_parser.h"
#include "base/check.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "components/payments/core/error_logger.h"
namespace payments {
namespace {
bool IsUpperCaseHexDigit(char c) {
return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F');
}
uint8_t HexDigitToByte(char c) {
DCHECK(IsUpperCaseHexDigit(c));
return base::checked_cast<uint8_t>(c >= '0' && c <= '9' ? c - '0'
: c - 'A' + 10);
}
} // namespace
std::vector<uint8_t> FingerprintStringToByteArray(const std::string& input,
const ErrorLogger& log) {
std::vector<uint8_t> output;
if (!base::IsStringASCII(input)) {
log.Error("Fingerprint should be an ASCII string.");
return output;
}
const size_t kLength = 32 * 3 - 1;
if (input.size() != kLength) {
log.Error(base::StringPrintf(
"Fingerprint \"%s\" should contain exactly %zu characters.",
(input.size() > kLength ? (input.substr(0, kLength) + "...") : input)
.c_str(),
kLength));
return output;
}
for (size_t i = 0; i < input.size(); i += 3) {
if (i < input.size() - 2 && input[i + 2] != ':') {
log.Error(
base::StringPrintf("Bytes in fingerprint \"%s\" should be separated "
"by \":\" characters.",
input.c_str()));
output.clear();
return output;
}
char big_end = input[i];
char little_end = input[i + 1];
if (!IsUpperCaseHexDigit(big_end) || !IsUpperCaseHexDigit(little_end)) {
log.Error(base::StringPrintf(
"Bytes in fingerprint \"%s\" should be upper case hex digits 0-9 and "
"A-F.",
input.c_str()));
output.clear();
return output;
}
output.push_back(HexDigitToByte(big_end) * static_cast<uint8_t>(16) +
HexDigitToByte(little_end));
}
return output;
}
} // namespace payments
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