Mercurial > code
diff C++/Hash.h @ 213:1829c4266bee
Hash: hash functions
author | David Demelier <markand@malikania.fr> |
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date | Mon, 24 Mar 2014 13:54:28 +0100 |
parents | |
children | 6a664378c5c4 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/C++/Hash.h Mon Mar 24 13:54:28 2014 +0100 @@ -0,0 +1,100 @@ +/* + * Hash.h -- hash functions + * + * Copyright (c) 2014 David Demelier <markand@malikania.fr> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef _HASH_H_ +#define _HASH_H_ + +/** + * @file Hash.h + * @brief Hash functions + */ + +#include <string> + +/** + * @class Hash + * @brief Hash functions + * + * Provide support for MD5, SHA1, SHA256 and SHA512. + */ +class Hash { +private: + template <typename Context> + using Init = int (*)(Context *); + + template <typename Context> + using Update = int (*)(Context *, const void *, size_t); + + template <typename Context> + using Final = int (*)(unsigned char *, Context *); + + template <typename Context, size_t Length> + static std::string convert(const std::string &input, + Init<Context> init, + Update<Context> update, + Final<Context> finalize) + { + unsigned char digest[Length]; + char hash[Length * 2 + 1]; + + Context ctx; + init(&ctx); + update(&ctx, input.c_str(), input.length()); + finalize(digest, &ctx); + + for (int i = 0; i < Length; i++) + sprintf(&hash[i * 2], "%02x", (unsigned int)digest[i]); + + return std::string(hash); + } + +public: + /** + * Hash using MD5. + * + * @param input the input string + * @return the hashed string + */ + static std::string md5(const std::string &input); + + /** + * Hash using SHA1. + * + * @param input the input string + * @return the hashed string + */ + static std::string sha1(const std::string &input); + + /** + * Hash using SHA256. + * + * @param input the input string + * @return the hashed string + */ + static std::string sha256(const std::string &input); + + /** + * Hash using SHA512. + * + * @param input the input string + * @return the hashed string + */ + static std::string sha512(const std::string &input); +}; + +#endif // !_HASH_H_