Nilorea Library
C utilities for networking, threading, graphics
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n_entropy.h
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1/*
2 * Nilorea Library
3 * Copyright (C) 2005-2026 Castagnier Mickael
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
14 * implied. See the License for the specific language governing
15 * permissions and limitations under the License.
16 *
17 * SPDX-License-Identifier: Apache-2.0
18 */
19
27#ifndef __NILOREA_ENTROPY_HEADER
28#define __NILOREA_ENTROPY_HEADER
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34#include <stddef.h>
35
44double n_entropy_shannon(const unsigned char* data, size_t len);
45
48double n_entropy_monobit(const unsigned char* data, size_t len);
49
53double n_entropy_chi_square(const unsigned char* data, size_t len);
54
59#ifdef __cplusplus
60}
61#endif
62
63/* #ifndef __NILOREA_ENTROPY_HEADER */
64#endif
double n_entropy_shannon(const unsigned char *data, size_t len)
Shannon entropy of the byte sample, in bits per byte (0.0 .
Definition n_entropy.c:29
double n_entropy_monobit(const unsigned char *data, size_t len)
Fraction of set bits in the sample (0.0 .
Definition n_entropy.c:48
double n_entropy_chi_square(const unsigned char *data, size_t len)
Chi-square statistic of the byte histogram against a uniform distribution over 256 values.
Definition n_entropy.c:64