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// Copyright 2014 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 "components/crx_file/id_util.h"
#include "base/files/file_path.h"
#include "base/sha1.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "crypto/sha2.h"
namespace {
// Converts a normal hexadecimal string into the alphabet used by extensions.
// We use the characters 'a'-'p' instead of '0'-'f' to avoid ever having a
// completely numeric host, since some software interprets that as an IP
// address.
static void ConvertHexadecimalToIDAlphabet(std::string* id) {
for (size_t i = 0; i < id->size(); ++i) {
int val;
if (base::HexStringToInt(
base::StringPiece(id->begin() + i, id->begin() + i + 1), &val)) {
(*id)[i] = val + 'a';
} else {
(*id)[i] = 'a';
}
}
}
} // namespace
namespace crx_file {
namespace id_util {
// First 16 bytes of SHA256 hashed public key.
const size_t kIdSize = 16;
std::string GenerateId(const std::string& input) {
uint8 hash[kIdSize];
crypto::SHA256HashString(input, hash, sizeof(hash));
std::string output =
base::ToLowerASCII(base::HexEncode(hash, sizeof(hash)));
ConvertHexadecimalToIDAlphabet(&output);
return output;
}
std::string GenerateIdForPath(const base::FilePath& path) {
base::FilePath new_path = MaybeNormalizePath(path);
std::string path_bytes =
std::string(reinterpret_cast<const char*>(new_path.value().data()),
new_path.value().size() * sizeof(base::FilePath::CharType));
return GenerateId(path_bytes);
}
std::string HashedIdInHex(const std::string& id) {
const std::string id_hash = base::SHA1HashString(id);
DCHECK_EQ(base::kSHA1Length, id_hash.length());
return base::HexEncode(id_hash.c_str(), id_hash.length());
}
base::FilePath MaybeNormalizePath(const base::FilePath& path) {
#if defined(OS_WIN)
// Normalize any drive letter to upper-case. We do this for consistency with
// net_utils::FilePathToFileURL(), which does the same thing, to make string
// comparisons simpler.
base::FilePath::StringType path_str = path.value();
if (path_str.size() >= 2 && path_str[0] >= L'a' && path_str[0] <= L'z' &&
path_str[1] == L':')
path_str[0] = towupper(path_str[0]);
return base::FilePath(path_str);
#else
return path;
#endif
}
bool IdIsValid(const std::string& id) {
// Verify that the id is legal.
if (id.size() != (crx_file::id_util::kIdSize * 2))
return false;
// We only support lowercase IDs, because IDs can be used as URL components
// (where GURL will lowercase it).
std::string temp = base::ToLowerASCII(id);
for (size_t i = 0; i < temp.size(); i++)
if (temp[i] < 'a' || temp[i] > 'p')
return false;
return true;
}
} // namespace id_util
} // namespace crx_file
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