1 % ![](img/mhash384/MHash-384.jpg)
3 % Simple fast portable secure hashing library
7 **MHash-384** is a fast, portable and secure hashing library, released under the *MIT license*.
9 The MHash-384 core library has been written in plain **C**, and the CLI front-end has been written in **C++**. The core library provides a simple "stream processing" API, that is available in two flavors: a plain C99 version and an *object-oriented* C++ wrapper. Either way, the MHash-384 library produces hash values with a fixed length of 384 bits (48 bytes).
11 MHash-384 supports a wide range of compilers, including MSVC++, GCC (MinGW/Cygwin), Clang/LLVM and Intel C++. It also runs on many platforms, including Windows and Linux. Furthermore, the MHash-384 library has already been *ported* to various other programming languages, including **Java**, **Microsoft.NET**, **Python** as well as **Delphi** and **Free Pascal**.
16 In order to use the *MHash-384* library, simply include the header file `mhash384.h` in your code:
20 ## Example for C language
22 If you source code is written in **C**, use the **`mhash384_t`** struct and the **`mhash384_XYZ()`** functions:
25 uint8_t buffer[BUFFSIZE];
27 uint8_t result[MHASH384_SIZE];
31 mhash384_init(&mhash384);
33 /*input data processing*/
36 len = read_data(buffer, BUFFSIZE);
37 mhash384_update(&mhash384, buffer, len);
41 mhash384_final(&mhash384, result);
43 ## Example for C++ language
45 Or, if you source code is written in **C++**, use the provided **`MHash384`** wrapper class:
50 /*input data processing*/
53 const std::vector<uint8_t> buffer = read_data();
54 mhash384.update(buffer);
58 const uint8_t *result = mhash384.finish();
63 MHash-384 comes with a simple "standalone" command-line application, similar to the `sha1sum` or`sha256sum` utilities.
67 The MHash-384 command-line application takes a number of optional options followed by an one or more input files.
69 If **no** input file is specified, input will be read from standard input (*stdin*).
71 The digest will be written to the standard output (*stdout*). Diagnostic message are written to the standard error (*stderr*).
73 mhash384 [OPTIONS] [<FILE_1> <FILE_2> ... <FILE_N>]
77 MHash-384 supports the following options:
80 Try to proceed with the remaining files, if a file has failed (e.g. access denied or file not found).
81 Only applicable, if *multiple* files have been specified. Default behavior is to abort immediately when a file has failed.
84 Print the digest in *short* format (**no** file names). Default format prints the digest followed by the file name.
87 Print the digest in *lower-case* letters. Default format prints the digest in *upper-case* letters.
88 This option can only be used with the default *Hex* (hexadecimal) output format; it is **not** supported for Base64 format!
91 Print the digest in [**Base64**](https://en.wikipedia.org/wiki/Base64) (RFC-4648) format. Default prints the digest in [**Hex**](https://en.wikipedia.org/wiki/Hexadecimal) (hexadecimal) output format.
94 Print the help screen (manpage) and exit program.
97 Print the program version (plus some build information) and exit program.
100 Run self-test and exit program. This will process various standard test vectors and validate the resulting hashes.
101 *Note:* Some test vectors contain very long inputs, therefore the computation can take a while to complete!
104 Enable stress test mode. This will process all test strings from the specified input file, expecting one string *per line*.
105 All computed hash values are added to an `std::unordered_set`, thus checking for possible collisions.
108 Measure the overall time required for the operation. If specified, output the total amount of time elapsed, in seconds.
112 In default operation mode, MHash-384 writes one line per input file to the standard output:
114 <HASH_VALUE> [SPACE SPACE <FILE_NAME>]
116 The format of the hash value is either [**Hex**](https://en.wikipedia.org/wiki/Hexadecimal) (hexadecimal) or [**Base64**](https://en.wikipedia.org/wiki/Base64) (RFC-4648), depending on the specified options.
118 Also, the file name will be printed, unless "short" format was requested. File names *may* contain a path!
120 #### Sample output {-}
122 BD41A203A61FE74178A8D507...33E553FD1569ED733C52BE8B debian-7.9.0-amd64-DVD-1.iso
123 EE328DDD4E116165252F1FF8...11729801097C51FB61D20184 debian-7.9.0-i386-DVD-1.iso
124 A8B2007537867BDA0C18A264...45A1379AB8B4A77F9D8C8B24 debian-10.0.0-amd64-DVD-1.iso
128 On success, *zero* is returned. On error or user interruption, a *non-zero* error code is returned.
130 Note that, with "keep going" mode enabled, the exit code reflects whether *at least* one file was processed successfully.
134 Compute MHash-384 hash of a single file:
136 mhash384 "C:\Images\debian-8.3.0-amd64-DVD-1.iso"
138 Compute MHash-384 hash of *two* files:
140 mhash384 "C:\Images\debian-8.3.0-amd64-DVD-1.iso" "C:\Images\debian-8.3.0-i386-DVD-1.iso"
142 Compute MHash-384 hash of *multiple* files, using wildcard expansion ([globbing](https://en.wikipedia.org/wiki/Glob_(programming))):
144 mhash384 "C:\Images\*.iso"
146 Compute MHash-384 hash from data passed directly via [pipeline](https://en.wikipedia.org/wiki/Pipeline_(Unix)):
148 dd if=/dev/urandom bs=100 count=1 | mhash384
153 ## Global definitions
155 Global definitions for both, the C and C++, API's.
159 The size of the final MHash-384 hash value (digest), in bytes. This value is qual to `48U`.
163 The number of words per MHash-384 hash. Each word has a size of 64 bits (`uint64_t`). This value is qual to `6U`.
165 ## API for C language
167 All functions described in the following are *reentrant* and *thread-safe*. A single thread may compute multiple MHash-384 hashes in an "interleaved" fashion, provided that a separate MHash-384 context is used for each ongoing hash computation. Multiple threads may compute multiple MHash-384 hashes in parallel, provided that each thread uses its own separate MHash-384 context; *no* synchronization is required. However, sharing the same MHash-384 context between multiple threads is **not** safe in the general case. If the same MHash-384 context needs to be accessed from multiple threads, then the threads need to be synchronized explicitly (e.g. via Mutex lock), ensuring that all access to the shared context is rigorously serialized!
171 typedef struct mhash384_t;
173 The MHash-384 context. It represents all state of an ongoing MHash-384 hash computation. Each MHash-384 hash computation needs a corresponding MHash-384 context. It is possible to re-use an MHash-384 context for multiple MHash-384 hash computations, provided that those hash computations are strictly serialized. If multiple MHash-384 hash computations need to be performed in an "interleaved" fashion, each ongoing hash computation needs to use its own separate MHash-384 context. In any case, the memory for the `mhash384_t` instance(s) must be allocated by the calling application. If the MHash-384 context was allocated on the heap space, the calling application also is responsible for freeing up that memory.
175 *Note:* Applications should treat this data-type as *opaque*, i.e. the application **must not** access the fields of the struct directly!
179 void mhash384_init(mhash384_t *const ctx);
181 Set up the MHash-384 hash computation. This function initializes the MHash-384 context; it prepares the state for the upcoming hash computation. The application is required to call this function *once* for each MHash-384 hash computation. The function must to be called ***before*** any input data can be processed in a specific MHash-384 context! The application may call this function again, on the same MHash-384 context, which will *reset* that context and start a new hash computation.
186 Pointer to the MHash-384 context of type `mhash384_t` that will be initialized (reset) by this operation.
187 *Note:* The MHash-384 library does **not** allocate the required memory; it must be allocated by the calling application!
189 ### mhash384_update()
191 void mhash384_update(mhash384_t *const ctx, const uint8_t *const data_in, const size_t len);
193 Process next chunk of input data. This function performs the actual MHash-384 hash computation, in an incremental way. The function processes the next **N** bytes of input data and updates the MHash-384 context (`mhash384_t`) accordingly. The application is supposed to call this function in a loop, with the *same* MHash-384 context, until all input has been processed.
198 Pointer to the hash computation state of type `mhash384_t` that will be updated by this operation.
200 * `const uint8_t *data_in`
201 Pointer to the input data to be processed by this operation. The input data needs to be located in one continuous block of memory. The given pointer specifies the *base address*, i.e. the address of the *first* byte to be processed.
202 *Note:* Formally, the input data is defined as an array of byte (`uint8_t`). Nonetheless, *any* kind of input data can be processed, by applying the proper *typecast* operator. For numeric values, the platform's [endianness](https://en.wikipedia.org/wiki/Endianness) applies!
205 The *length* of the input data to be processed, *in bytes*. Specify `sizeof(T) * count` for data types **T** other than byte.
206 *Note:* All *bytes* in the range from `data_in[0]` up to and including `data_in[len-1]` will be processed as input.
210 void mhash384_final(mhash384_t *const ctx, uint8_t *const digest_out);
212 Retrieve final hash value. This function completes the MHash-384 hash computation and returns the computed hash value. The function finalizes the MHash-384 context (`mhash384_t`) and writes the resulting hash value to the output buffer. Once this function has been called, the corresponding MHash-384 context will be in an ***undefined*** state, until it is [reset](#mhash384_init)!
217 Pointer to the hash computation state of type `mhash384_t` that will be finalized by this operation.
218 *Note:* The MHash-384 library does **not** free this memory; it may need to be freed up by the calling application!
220 * `uint8_t *digest_out`
221 Pointer to the memory block where the final MHash-384 hash (digest) is to be stored. This memory needs to be allocated by the calling application! The size of the MHash-384 hash value, in bytes, is equal to `MHASH384_SIZE`.
222 *Note:* All *bytes* ranging from `digest_out[0]` up to and including `digest_out[MHASH384_SIZE-1]` will be overwritten!
224 ### mhash384_compute()
226 void mhash384_compute(uint8_t *const digest_out, const uint8_t *const data_in, const size_t len);
228 Compute hash value at once. This is a convenience function that can be used to compute an MHash-384 hash value with just a single invocation. The function processes a block of **N** input bytes and writes the resulting hash value to the output buffer. This function does *not* required the caller to provide an MHash-384 context; it internally uses a "transient" context. Anyway, this function is fully thread-safe. Naturally, this function is *only* applicable where *all* input data is available at once.
232 * `uint8_t *digest_out`
233 Pointer to the memory block where the final MHash-384 hash (digest) is to be stored. This memory needs to be allocated by the calling application! This size of the MHash-384 hash value, in bytes, is equal to `MHASH384_SIZE`.
234 *Note:* All *bytes* ranging from `digest_out[0]` up to and including `digest_out[MHASH384_SIZE-1]` will be overwritten!
236 * `const uint8_t *data_in`
237 Pointer to the input data to be processed by this operation. The input data needs to be located in one continuous block of memory. The given pointer specifies the *base address*, i.e. the address of the *first* byte to be processed.
238 *Note:* Formally, the input data is defined as an array of byte (`uint8_t`). Nonetheless, *any* kind of input data can be processed, by applying the proper *typecast* operator. For numeric values, the platform's [endianness](https://en.wikipedia.org/wiki/Endianness) applies!
241 The *length* of the input data to be processed, *in bytes*. Specify `sizeof(T) * count` for data types **T** other than byte.
242 *Note:* All *bytes* in the range from `data_in[0]` up to and including `data_in[len-1]` will be processed as input.
244 ### mhash384_version()
246 void mhash384_version (uint16_t *const major, uint16_t *const minor, uint16_t *const patch);
248 Retrieve version information. This function returns the current version of the MHash-384 library.
253 Pointer to a variable of type `uint16_t` where the *major* version of the MHash-384 library will be stored.
256 Pointer to a variable of type `uint16_t` where the *minor* version of the MHash-384 library will be stored.
259 Pointer to a variable of type `uint16_t` where the *patch* level of the MHash-384 library will be stored.
261 ### mhash384_selftest()
263 bool mhash384_selftest(void);
265 Self-test routine. This function runs the built-in self-test of the MHash-384 library; intended for debugging purposes.
269 * Returns `true`, if the self-test completed successfully; returns `false`, if any problems have been detected.
271 ## API for C++ language
273 For the C++ langauge, the **`MHash384`** class is provided, as a convenience wrapper around the C-API. All functions of the `MHash384` class are *reentrant* and *thread-safe*. A single thread may compute multiple MHash-384 hashes in an "interleaved" fashion, provided that a separate `MHash384` instance (object) is used for each ongoing hash computation. Multiple threads may compute multiple MHash-384 hashes in parallel, provided that each thread uses its own separate `MHash384` instance; *no* synchronization is required. However, sharing the same `MHash384` instance between multiple threads is **not** safe in the general case. If the same `MHash384` instance needs to be accessed from multiple threads, then the threads need to be synchronized explicitly (e.g. via Mutex lock), ensuring that all access to the shared instance is rigorously serialized!
279 Constructor. Creates a new `MHash384` instance (object) and prepares the state for the upcoming hash computation. Each instance *internally* maintains the corresponding MHash-384 context. The application is required to create a separate `MHash384` instance for each ongoing MHash-384 hash computation; it is possible to re-use an `MHash384` instance for multiple MHash-384 hash computations, provided that those hash computations are strictly serialized.
280 *Note:* The application is required to allocate the memory for the `MHash384` instance. If the instance was allocated on the heap (*dynamic* storage duration), the application is also required to explicitly destroy the instance, when no longer needed.
282 ### MHash384::update() [1]
284 void MHash384::update(const std::uint8_t *const data, const size_t len)
286 Process next chunk of input data. This function performs the actual MHash-384 hash computation, in an incremental way. The function processes the next **N** bytes of input data and updates the internal MHash-384 context accordingly. The application is supposed to call this function in a loop, on the *same* `MHash384` instance, until all input has been processed.
290 * `const uint8_t *data_in`
291 Pointer to the input data to be processed by this operation. The input data needs to be located in one continuous block of memory. The given pointer specifies the *base address*, i.e. the address of the *first* byte to be processed.
292 *Note:* Formally, the input data is defined as an array of byte (`uint8_t`). Nonetheless, *any* kind of input data can be processed, by applying the proper *typecast* operator. For numeric values, the platform's [endianness](https://en.wikipedia.org/wiki/Endianness) applies!
295 The *length* of the input data to be processed, *in bytes*. Specify `sizeof(T) * count` for data types **T** other than byte.
296 *Note:* All *bytes* in the range from `data_in[0]` up to and including `data_in[len-1]` will be processed as input.
298 ### MHash384::update() [2]
300 template<size_t size>
301 void MHash384::update(const std::array<std::uint8_t, size> &data)
303 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes an `std::array<uint8_t, N>` as input.
307 * `const std::array<uint8_t, N> &data`
308 Read-only reference to the `std::array<uint8_t, N>` containing the input data to be processed.
309 *Note:* All bytes in the range from `data[0]` up to and including `data[data.size()-1]` will be processed as input.
311 ### MHash384::update() [3]
313 void MHash384::update(const std::vector<std::uint8_t> &data)
315 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes an `std::vector<uint8_t>` as input.
319 * `const std::vector<std::uint8_t> &data`
320 Read-only reference to the `std::vector<uint8_t>` containing the input data to be processed.
321 *Note:* All bytes in the range from `data[0]` up to and including `data[data.size()-1]` will be processed as input.
323 ### MHash384::update() [4]
325 void MHash384::update(const std::string &text)
327 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes an `std::string` as input.
331 * `const std::string &text`
332 Read-only reference to the `std::string` containing the input data to be processed.
333 *Note:* All characters in the range from `text[0]` up to and including `text[text.length()-1]` will be processed as input. Each character in the `std::string` is processed as a *byte* value, disregarding any specific character encoding.
335 ### MHash384::update() [5]
337 void MHash384::update(const char *const text)
339 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes a NULL-terminated C string as input.
343 * `const char *const text`
344 Read-only pointer to the first character of the NULL-terminated string to be processed.
345 *Note:* All characters in the range from `text[0]` up to and including `text[strlen(text)-1]` will be processed as input. Each character in the C string is processed as a *byte* value, disregarding any specific character encoding.
347 ### MHash384::update() [6]
349 template<typename element_type>
350 void MHash384::update(const element_type *const address);
352 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes an object designated by a pointer.
356 * `const element_type *const address`
357 Read-only pointer to the target object to be processed.
358 *Note:* The given object is processed as a byte-sequence, like a POD; all bytes in the range from `address[0]` up to and including `address[sizeof(element_type)-1]` will be processed as input.
360 ### MHash384::update() [7]
362 template<typename element_type>
363 void MHash384::update(const element_type &element);
365 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes an object designated by a reference.
369 * `const element_type &element`
370 Read-only reference to the target object to be processed.
371 *Note:* The given object is processed as a byte-sequence, like a POD; all bytes in the range from `addr[0]` up to and including `addr[sizeof(element_type)-1]` with `addr = std::addressof(element)` will be processed as input.
373 ### MHash384::update() [8]
375 template<typename iterator_type>
376 void MHash384::update(const iterator_type &first, const iterator_type &last)
378 A convenience overload of the [`MHash384::update()`](#mhash384update-1) function, which processes a sequence of elements via iterators.
382 * `const iterator_type &first`
383 Read-only reference to the iterator designating the *first* element to be processed.
384 *Note:* All elements in the range from `*first` up to but excluding `*last` will be processed as input. Each element in this range is processed as a byte-sequence, like a POD, assuming a size of `sizeof(iterator_type::value_type)`.
386 * `const iterator_type &last`
387 Read-only reference to the iterator designating the element just after the *last* element to be processed.
388 *Note:* All elements in the range from `*first` up to but excluding `*last` will be processed as input. Each element in this range is processed as a byte-sequence, like a POD, assuming a size of `sizeof(iterator_type::value_type)`.
390 ### MHash384::finish()
392 const std::uint8_t *MHash384::finish(void)
394 Retrieve final hash value. This function completes the MHash-384 hash computation. The function finalizes the internal MHash-384 context, if it was not finalized yet, and returns a pointer to the buffer containing the resulting hash value. Once this function has been called, the `MHash384` instance remains in the *finalized* state, until it is [reset](#mhash384reset).
396 ***Warning:*** Trying to process more input data while the `MHash384` instance is in *finalized* state will throw an exception!
400 * Returns a read-only pointer to the internal buffer containing the final hash value; this buffer is owned by the `MHash384` instance. The size of the MHash-384 hash value, in bytes, is equal to `MHASH384_SIZE`.
401 *Note:* This pointer remains valid only until the `MHash384` instance is [reset](#mhash384reset) or destroyed. If the hash value needs to be retained after the instance was reset/destroyed, the application must copy the hash value to a separate buffer!
403 ### MHash384::reset()
405 void MHash384::reset(void)
407 Reset the MHash-384 hash computation. This function re-initializes the internal MHash-384 context, thus starting a new MHash-384 hash computation. It is **not** necessary to explicitly call this function on a new `MHash384` instance; it is called implicitly by the constructor. However, it is possible to re-use an existing `MHash384` instance for multiple (strictly serialized) MHash-384 hash computations, by calling this function in between each pair of consecutive hash computations.
412 **MHash-384 - Simple fast portable secure hashing library**
413 **Copyright(c) 2016-2020 LoRd_MuldeR <mulder2@gmx.de>**
415 Permission is hereby granted, free of charge, to any person obtaining a copy of this software
416 and associated documentation files (the "Software"), to deal in the Software without
417 restriction, including without limitation the rights to use, copy, modify, merge, publish,
418 distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
419 Software is furnished to do so, subject to the following conditions:
421 The above copyright notice and this permission notice shall be included in all copies or
422 substantial portions of the Software.
424 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
425 BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
426 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
427 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
428 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
430 <https://opensource.org/licenses/MIT>
435 ## Version 2.0.0 [????-??-??]
437 * Initial release of the 2.x development cycle
441 [■](https://www.youtube.com/watch?v=dng06ZqI4Ss)