forked from lda/telodendria
Add Sha2
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5 changed files with 312 additions and 1 deletions
2
TODO.txt
2
TODO.txt
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@ -16,7 +16,7 @@ Milestone: v0.2.0
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[~] User registration
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[x] Username validation
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[ ] Password hashing
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[x] Password hashing
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[ ] User API
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Milestone: v1.0.0
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27
man/man3/Sha2.3
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27
man/man3/Sha2.3
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@ -0,0 +1,27 @@
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.Dd $Mdocdate: December 19 2022 $
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.Dt SHA2 3
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.Os Telodendria Project
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.Sh NAME
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.Nm Sha2
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.Nd A simple implementation of the SHA2 hashing functions.
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.Sh SYNOPSIS
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.In Sha2.h
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.Ft char *
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.Fn Sha256 "char *"
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.Sh DESCRIPTION
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.Pp
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This API defines simple functions for computing SHA2 hashes. At the
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moment, it only defines
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.Fn Sha256 ,
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which computes the SHA-256 hash of the given C string. It is not trivial
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to implement SHA-512 in ANSI C due to the lack of a 64-bit integer
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type, so that hash function has been omitted.
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.Sh RETURN VALUES
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.Pp
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.Fn Sha256
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returns a string allocated on the heap using the Memory API, or NULL
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if there was an error allocating memory for it. The returned string
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should be freed when it is no longer needed.
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.Sh SEE ALSO
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.Xr Memory 3 ,
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.Xr Base64 3
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@ -273,6 +273,12 @@ Encode and decode various parts of the HTTP protocol.
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Extremely simple HTTP server.
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</td>
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</tr>
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<tr>
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<td><a href="man/man3/Sha2.3.html">Sha2(3)</a></td>
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<td>
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A simple implementation of the SHA2 hashing functions.
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</td>
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</tr>
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</table>
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</details>
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<hr>
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247
src/Sha2.c
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247
src/Sha2.c
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@ -0,0 +1,247 @@
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/*
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* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <Sha2.h>
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#include <Memory.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#if defined(LONG_BIT) && LONG_BIT == 32
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typedef unsigned long uint32_t;
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#elif defined(WORD_BIT) && WORD_BIT == 32
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typedef unsigned int uint32_t;
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#else
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#error Unable to find suitable integer type for uint32_t
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#endif
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#define GET_UINT32(x) \
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(((uint32_t)(x)[0] << 24) | \
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((uint32_t)(x)[1] << 16) | \
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((uint32_t)(x)[2] << 8) | \
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((uint32_t)(x)[3]))
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#define PUT_UINT32(dst, x) { \
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(dst)[0] = (x) >> 24; \
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(dst)[1] = (x) >> 16; \
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(dst)[2] = (x) >> 8; \
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(dst)[3] = (x); \
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}
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#define ROTR(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ (x >> 3))
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#define S1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ (x >> 10))
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#define T0(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
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#define T1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
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#define CH(a, b, c) (((a) & (b)) ^ ((~(a)) & (c)))
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#define MAJ(a, b, c) (((a) & (b)) ^ ((a) & (c)) ^ ((b) & (c)))
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#define WW(i) (w[i] = w[i - 16] + S0(w[i - 15]) + w[i - 7] + S1(w[i - 2]))
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#define ROUND(a, b, c, d, e, f, g, h, k, w) { \
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unsigned long tmp0 = h + T0(e) + CH(e, f, g) + k + w; \
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unsigned long tmp1 = T1(a) + MAJ(a, b, c); \
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h = tmp0 + tmp1; \
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d += tmp0; \
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}
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typedef struct Sha256Context
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{
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size_t length;
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uint32_t state[8];
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size_t bufLen;
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unsigned char buffer[64];
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} Sha256Context;
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static void
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Sha256Chunk(Sha256Context * context, unsigned char chunk[64])
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{
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const uint32_t rk[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
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0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
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0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
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0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
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0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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uint32_t w[64];
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uint32_t a, b, c, d, e, f, g, h;
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int i;
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for (i = 0; i < 16; i++)
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{
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w[i] = GET_UINT32(&chunk[4 * i]);
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}
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a = context->state[0];
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b = context->state[1];
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c = context->state[2];
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d = context->state[3];
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e = context->state[4];
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f = context->state[5];
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g = context->state[6];
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h = context->state[7];
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for (i = 0; i < 16; i += 8)
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{
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ROUND(a, b, c, d, e, f, g, h, rk[i], w[i]);
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ROUND(h, a, b, c, d, e, f, g, rk[i + 1], w[i + 1]);
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ROUND(g, h, a, b, c, d, e, f, rk[i + 2], w[i + 2]);
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ROUND(f, g, h, a, b, c, d, e, rk[i + 3], w[i + 3]);
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ROUND(e, f, g, h, a, b, c, d, rk[i + 4], w[i + 4]);
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ROUND(d, e, f, g, h, a, b, c, rk[i + 5], w[i + 5]);
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ROUND(c, d, e, f, g, h, a, b, rk[i + 6], w[i + 6]);
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ROUND(b, c, d, e, f, g, h, a, rk[i + 7], w[i + 7]);
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}
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for (i = 16; i < 64; i += 8)
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{
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ROUND(a, b, c, d, e, f, g, h, rk[i], WW(i));
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ROUND(h, a, b, c, d, e, f, g, rk[i + 1], WW(i + 1));
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ROUND(g, h, a, b, c, d, e, f, rk[i + 2], WW(i + 2));
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ROUND(f, g, h, a, b, c, d, e, rk[i + 3], WW(i + 3));
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ROUND(e, f, g, h, a, b, c, d, rk[i + 4], WW(i + 4));
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ROUND(d, e, f, g, h, a, b, c, rk[i + 5], WW(i + 5));
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ROUND(c, d, e, f, g, h, a, b, rk[i + 6], WW(i + 6));
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ROUND(b, c, d, e, f, g, h, a, rk[i + 7], WW(i + 7));
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}
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context->state[0] += a;
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context->state[1] += b;
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context->state[2] += c;
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context->state[3] += d;
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context->state[4] += e;
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context->state[5] += f;
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context->state[6] += g;
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context->state[7] += h;
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}
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static void
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Sha256Process(Sha256Context * context, unsigned char *data, size_t length)
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{
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context->length += length;
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if (context->bufLen && context->bufLen + length >= 64)
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{
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int len = 64 - context->bufLen;
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memcpy(context->buffer + context->bufLen, data, len);
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Sha256Chunk(context, context->buffer);
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data += len;
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length -= len;
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context->bufLen = 0;
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}
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while (length >= 64)
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{
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Sha256Chunk(context, data);
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data += 64;
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length -= 64;
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}
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if (length)
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{
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memcpy(context->buffer + context->bufLen, data, length);
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context->bufLen += length;
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}
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}
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char *
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Sha256(char *str)
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{
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Sha256Context context;
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size_t i;
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unsigned char out[32];
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char *outStr;
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char fill[64];
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uint32_t fillLen;
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unsigned char buf[8];
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uint32_t hiLen;
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uint32_t loLen;
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if (!str)
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{
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return NULL;
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}
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outStr = Malloc(65);
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if (!outStr)
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{
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return NULL;
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}
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context.state[0] = 0x6a09e667;
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context.state[1] = 0xbb67ae85;
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context.state[2] = 0x3c6ef372;
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context.state[3] = 0xa54ff53a;
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context.state[4] = 0x510e527f;
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context.state[5] = 0x9b05688c;
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context.state[6] = 0x1f83d9ab;
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context.state[7] = 0x5be0cd19;
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context.bufLen = 0;
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context.length = 0;
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memset(context.buffer, 0, 64);
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Sha256Process(&context, (unsigned char *) str, strlen(str));
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memset(fill, 0, 64);
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fill[0] = 0x80;
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fillLen = (context.bufLen < 56) ? 56 - context.bufLen : 120 - context.bufLen;
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hiLen = (unsigned long) (context.length >> 29);
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loLen = (unsigned long) (context.length << 3);
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PUT_UINT32(&buf[0], hiLen);
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PUT_UINT32(&buf[4], loLen);
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Sha256Process(&context, (unsigned char *) fill, fillLen);
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Sha256Process(&context, buf, 8);
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for (i = 0; i < 8; i++)
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{
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PUT_UINT32(&out[4 * i], context.state[i]);
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}
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/* Convert to string */
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for (i = 0; i < 32; i++)
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{
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sprintf(outStr + (2 * i), "%02x", out[i]);
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}
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return outStr;
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}
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31
src/include/Sha2.h
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31
src/include/Sha2.h
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/*
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* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef TELODENDRIA_SHA2_H
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#define TELODENDRIA_SHA2_H
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extern char *
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Sha256(char *);
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#endif /* TELODENDRIA_SHA2_H */
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