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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "extensions/common/id_util.h" |
| 6 |
| 7 #include "base/files/file_path.h" |
| 8 #include "base/string_number_conversions.h" |
| 9 #include "base/string_util.h" |
| 10 #include "crypto/sha2.h" |
| 11 |
| 12 namespace { |
| 13 |
| 14 // Converts a normal hexadecimal string into the alphabet used by extensions. |
| 15 // We use the characters 'a'-'p' instead of '0'-'f' to avoid ever having a |
| 16 // completely numeric host, since some software interprets that as an IP |
| 17 // address. |
| 18 static void ConvertHexadecimalToIDAlphabet(std::string* id) { |
| 19 for (size_t i = 0; i < id->size(); ++i) { |
| 20 int val; |
| 21 if (base::HexStringToInt(base::StringPiece(id->begin() + i, |
| 22 id->begin() + i + 1), |
| 23 &val)) { |
| 24 (*id)[i] = val + 'a'; |
| 25 } else { |
| 26 (*id)[i] = 'a'; |
| 27 } |
| 28 } |
| 29 } |
| 30 |
| 31 } // namespace |
| 32 |
| 33 namespace extensions { |
| 34 namespace id_util { |
| 35 |
| 36 // First 16 bytes of SHA256 hashed public key. |
| 37 const size_t kIdSize = 16; |
| 38 |
| 39 std::string GenerateId(const std::string& input) { |
| 40 uint8 hash[kIdSize]; |
| 41 crypto::SHA256HashString(input, hash, sizeof(hash)); |
| 42 std::string output = StringToLowerASCII(base::HexEncode(hash, sizeof(hash))); |
| 43 ConvertHexadecimalToIDAlphabet(&output); |
| 44 |
| 45 return output; |
| 46 } |
| 47 |
| 48 std::string GenerateIdForPath(const base::FilePath& path) { |
| 49 base::FilePath new_path = MaybeNormalizePath(path); |
| 50 std::string path_bytes = |
| 51 std::string(reinterpret_cast<const char*>(new_path.value().data()), |
| 52 new_path.value().size() * sizeof(base::FilePath::CharType)); |
| 53 return GenerateId(path_bytes); |
| 54 } |
| 55 |
| 56 base::FilePath MaybeNormalizePath(const base::FilePath& path) { |
| 57 #if defined(OS_WIN) |
| 58 // Normalize any drive letter to upper-case. We do this for consistency with |
| 59 // net_utils::FilePathToFileURL(), which does the same thing, to make string |
| 60 // comparisons simpler. |
| 61 base::FilePath::StringType path_str = path.value(); |
| 62 if (path_str.size() >= 2 && path_str[0] >= L'a' && path_str[0] <= L'z' && |
| 63 path_str[1] == ':') |
| 64 path_str[0] += ('A' - 'a'); |
| 65 |
| 66 return base::FilePath(path_str); |
| 67 #else |
| 68 return path; |
| 69 #endif |
| 70 } |
| 71 |
| 72 } // namespace id_util |
| 73 } // namespace extensions |
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