1// Copyright (c) 2011 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// The original source code is from: 6// http://src.chromium.org/viewvc/chrome/trunk/src/base/md5.h?revision=94203 7 8#ifndef I18N_ADDRESSINPUT_UTIL_MD5_H_ 9#define I18N_ADDRESSINPUT_UTIL_MD5_H_ 10 11#include <cstddef> 12#include <string> 13 14namespace i18n { 15namespace addressinput { 16 17// MD5 stands for Message Digest algorithm 5. 18// MD5 is a robust hash function, designed for cyptography, but often used 19// for file checksums. The code is complex and slow, but has few 20// collisions. 21// See Also: 22// http://en.wikipedia.org/wiki/MD5 23 24// These functions perform MD5 operations. The simplest call is MD5Sum() to 25// generate the MD5 sum of the given data. 26// 27// You can also compute the MD5 sum of data incrementally by making multiple 28// calls to MD5Update(): 29// MD5Context ctx; // intermediate MD5 data: do not use 30// MD5Init(&ctx); 31// MD5Update(&ctx, data1, length1); 32// MD5Update(&ctx, data2, length2); 33// ... 34// 35// MD5Digest digest; // the result of the computation 36// MD5Final(&digest, &ctx); 37// 38// You can call MD5DigestToBase16() to generate a string of the digest. 39 40// The output of an MD5 operation. 41struct MD5Digest { 42 unsigned char a[16]; 43}; 44 45// Used for storing intermediate data during an MD5 computation. Callers 46// should not access the data. 47typedef char MD5Context[88]; 48 49// Computes the MD5 sum of the given data buffer with the given length. 50// The given 'digest' structure will be filled with the result data. 51void MD5Sum(const void* data, size_t length, MD5Digest* digest); 52 53// Initializes the given MD5 context structure for subsequent calls to 54// MD5Update(). 55void MD5Init(MD5Context* context); 56 57// For the given buffer of |data| as a StringPiece, updates the given MD5 58// context with the sum of the data. You can call this any number of times 59// during the computation, except that MD5Init() must have been called first. 60void MD5Update(MD5Context* context, const std::string& data); 61 62// Finalizes the MD5 operation and fills the buffer with the digest. 63void MD5Final(MD5Digest* digest, MD5Context* context); 64 65// Converts a digest into human-readable hexadecimal. 66std::string MD5DigestToBase16(const MD5Digest& digest); 67 68// Returns the MD5 (in hexadecimal) of a string. 69std::string MD5String(const std::string& str); 70 71} // namespace addressinput 72} // namespace i18n 73 74#endif // I18N_ADDRESSINPUT_UTIL_MD5_H_ 75