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54 lines
2.5 KiB
C
54 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/math.h"
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#include "libc/stdio/rand.h"
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#include "libc/str/str.h"
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/**
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* Returns Shannon entropy of array.
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*
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* This gives you an idea of the density of information. Cryptographic
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* random should be in the ballpark of 7.9 whereas plaintext will be
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* more like 4.5.
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*
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* @param p is treated as binary octets
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* @param n should be at least 1000
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* @return number between 0 and 8
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*/
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double MeasureEntropy(const char *p, size_t n) {
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size_t i;
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double e, x;
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long h[256];
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e = 0;
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if (n) {
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bzero(h, sizeof(h));
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for (i = 0; i < n; ++i) {
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++h[p[i] & 255];
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}
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for (i = 0; i < 256; i++) {
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if (h[i]) {
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x = h[i];
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x /= n;
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e += x * log(x);
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}
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}
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e = -(e / M_LN2);
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}
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return e;
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}
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