/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Sha.h>
#include <Memory.h>
#include <Int.h>
#include <string.h>
#include <limits.h>
#define LOAD32H(x, y) \
{ \
x = ((UInt32)((y)[0] & 255) << 24) | \
((UInt32)((y)[1] & 255) << 16) | \
((UInt32)((y)[2] & 255) << 8) | \
((UInt32)((y)[3] & 255)); \
}
#define ROL(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
#define BLK(i) (block->l[i & 15] = ROL(block->l[(i+13) & 15] ^ block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 1))
#define R0(v, w, x, y, z, i) z += ((w & (x ^ y)) ^ y) + block->l[i] + 0x5A827999 + ROL(v, 5); w = ROL(w, 30);
#define R1(v, w, x, y, z, i) z += ((w & (x ^ y)) ^ y) + BLK(i) + 0x5A827999 + ROL(v, 5); w = ROL(w, 30);
#define R2(v, w, x, y, z, i) z += (w ^ x ^ y) + BLK(i) + 0x6ED9EBA1 + ROL(v, 5); w = ROL(w, 30);
#define R3(v, w, x, y, z, i) z += (((w | x) & y) | (w & x)) + BLK(i) + 0x8F1BBCDC + ROL(v, 5); w = ROL(w, 30);
#define R4(v, w, x, y, z, i) z += (w ^ x ^ y) + BLK(i) + 0xCA62C1D6 + ROL(v, 5); w = ROL(w, 30);
typedef union
{
UInt8 c[64];
UInt32 l[16];
} Char64Long16;
typedef struct
{
UInt32 state[5];
UInt32 count[2];
UInt8 buffer[64];
} Sha1Context;
static void
Sha1Transform(UInt32 state[5], const UInt8 buffer[64])
{
UInt32 a, b, c, d, e, i;
UInt8 workspace[64];
Char64Long16 *block = (Char64Long16 *) workspace;
for (i = 0; i < 16; i++)
{
LOAD32H(block->l[i], buffer + (i * 4));
}
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
R0(a, b, c, d, e, 0);
R0(e, a, b, c, d, 1);
R0(d, e, a, b, c, 2);
R0(c, d, e, a, b, 3);
R0(b, c, d, e, a, 4);
R0(a, b, c, d, e, 5);
R0(e, a, b, c, d, 6);
R0(d, e, a, b, c, 7);
R0(c, d, e, a, b, 8);
R0(b, c, d, e, a, 9);
R0(a, b, c, d, e, 10);
R0(e, a, b, c, d, 11);
R0(d, e, a, b, c, 12);
R0(c, d, e, a, b, 13);
R0(b, c, d, e, a, 14);
R0(a, b, c, d, e, 15);
R1(e, a, b, c, d, 16);
R1(d, e, a, b, c, 17);
R1(c, d, e, a, b, 18);
R1(b, c, d, e, a, 19);
R2(a, b, c, d, e, 20);
R2(e, a, b, c, d, 21);
R2(d, e, a, b, c, 22);
R2(c, d, e, a, b, 23);
R2(b, c, d, e, a, 24);
R2(a, b, c, d, e, 25);
R2(e, a, b, c, d, 26);
R2(d, e, a, b, c, 27);
R2(c, d, e, a, b, 28);
R2(b, c, d, e, a, 29);
R2(a, b, c, d, e, 30);
R2(e, a, b, c, d, 31);
R2(d, e, a, b, c, 32);
R2(c, d, e, a, b, 33);
R2(b, c, d, e, a, 34);
R2(a, b, c, d, e, 35);
R2(e, a, b, c, d, 36);
R2(d, e, a, b, c, 37);
R2(c, d, e, a, b, 38);
R2(b, c, d, e, a, 39);
R3(a, b, c, d, e, 40);
R3(e, a, b, c, d, 41);
R3(d, e, a, b, c, 42);
R3(c, d, e, a, b, 43);
R3(b, c, d, e, a, 44);
R3(a, b, c, d, e, 45);
R3(e, a, b, c, d, 46);
R3(d, e, a, b, c, 47);
R3(c, d, e, a, b, 48);
R3(b, c, d, e, a, 49);
R3(a, b, c, d, e, 50);
R3(e, a, b, c, d, 51);
R3(d, e, a, b, c, 52);
R3(c, d, e, a, b, 53);
R3(b, c, d, e, a, 54);
R3(a, b, c, d, e, 55);
R3(e, a, b, c, d, 56);
R3(d, e, a, b, c, 57);
R3(c, d, e, a, b, 58);
R3(b, c, d, e, a, 59);
R4(a, b, c, d, e, 60);
R4(e, a, b, c, d, 61);
R4(d, e, a, b, c, 62);
R4(c, d, e, a, b, 63);
R4(b, c, d, e, a, 64);
R4(a, b, c, d, e, 65);
R4(e, a, b, c, d, 66);
R4(d, e, a, b, c, 67);
R4(c, d, e, a, b, 68);
R4(b, c, d, e, a, 69);
R4(a, b, c, d, e, 70);
R4(e, a, b, c, d, 71);
R4(d, e, a, b, c, 72);
R4(c, d, e, a, b, 73);
R4(b, c, d, e, a, 74);
R4(a, b, c, d, e, 75);
R4(e, a, b, c, d, 76);
R4(d, e, a, b, c, 77);
R4(c, d, e, a, b, 78);
R4(b, c, d, e, a, 79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
}
static void
Sha1Init(Sha1Context * ctx)
{
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->count[0] = 0;
ctx->count[1] = 0;
}
static void
Sha1Update(Sha1Context * ctx, const void *buf, UInt32 size)
{
UInt32 i, j;
j = (ctx->count[0] >> 3) & 63;
if ((ctx->count[0] += size << 3) < (size << 3))
{
ctx->count[1]++;
}
ctx->count[1] += (size >> 29);
if ((j + size) > 63)
{
i = 64 - j;
memcpy(&ctx->buffer[j], buf, i);
Sha1Transform(ctx->state, ctx->buffer);
for (; i + 63 < size; i += 64)
{
Sha1Transform(ctx->state, (UInt8 *) buf + i);
}
j = 0;
}
else
{
i = 0;
}
memcpy(&ctx->buffer[j], &((UInt8 *) buf)[i], size - i);
}
static void
Sha1Calculate(Sha1Context * ctx, unsigned char *out)
{
UInt32 i;
UInt8 count[8];
for (i = 0; i < 8; i++)
{
count[i] = (unsigned char) ((ctx->count[(i >= 4 ? 0 : 1)]
>> ((3 - (i & 3)) * 8)) & 255);
}
Sha1Update(ctx, (UInt8 *) "\x80", 1);
while ((ctx->count[0] & 504) != 448)
{
Sha1Update(ctx, (UInt8 *) "\0", 1);
}
Sha1Update(ctx, count, 8);
for (i = 0; i < (160 / 8); i++)
{
out[i] = (UInt8) ((ctx->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
}
}
unsigned char *
Sha1(char *str)
{
Sha1Context ctx;
unsigned char *out;
if (!str)
{
return NULL;
}
out = Malloc(((160 / 8) + 1) * sizeof(unsigned char));
if (!out)
{
return NULL;
}
Sha1Init(&ctx);
Sha1Update(&ctx, str, strlen(str));
Sha1Calculate(&ctx, out);
out[160 / 8] = '\0';
return out;
}