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/*******************************************************************************
* Teeny SHA-1
*
* The below sha1digest() calculates a SHA-1 hash value for a
* specified data buffer and generates a hex representation of the
* result. This implementation is a re-forming of the SHA-1 code at
* https://github.com/jinqiangshou/EncryptionLibrary.
*
* Copyright (c) 2017 CTrabant
*
* License: MIT, see included LICENSE file for details.
*
* To use the sha1digest() function either copy it into an existing
* project source code file or include this file in a project and put
* the declaration (example below) in the sources files where needed.
******************************************************************************/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define SWAB(a) ((a>>24) | ((a & 0x00ff0000>>8)) | ((a &0x0000ff00) <<8) | (a<<24))
uint32_t key[] = { 0x6e380e89, 0xe9cf3cbb, 0xe44f0000 };
uint32_t k1 = 0x5A827999;
uint32_t k2 = 0x6ED9EBA1;
uint32_t k3 = 0x8F1BBCDC;
uint32_t k4 = 0xCA62C1D6;
uint32_t ffffffff = 0xffffffff;
uint32_t va, vb, vc, vd, ve, t1, t2, zero;
uint32_t data[6];
uint32_t data2;
uint32_t key_or;
uint8_t lidx;
uint8_t idx;
uint32_t H[5];
uint32_t Wbuf[16];
uint32_t HI[] = {
0x67452301,
0xEFCDAB89,
0x98BADCFE,
0x10325476,
0xC3D2E1F0
};
#define SHA1ROTATELEFT(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
void
set_key_or (uint8_t v)
{
key_or = v;
key_or <<= 8;
key_or |= v;
key_or <<= 8;
key_or |= v;
key_or <<= 8;
key_or |= v;
}
void
get_w32_015_to_t2 (int idx)
{
uint32_t t1;
if (!lidx)
{
if (idx < 3)
{
t2 = key[idx] + zero;
}
else
{
t2 = zero + zero;
}
t2 = t2 ^ key_or;
return;
}
if (idx < 6)
{
t2 = data[idx];
return;
}
if (idx < 15)
{
t2 = 0;
return;
}
t2 = data2;
}
uint32_t
get_w32_to_t2 (void)
{
int i;
for (i = 0; i < 16; ++i)
{
get_w32_015_to_t2 (i);
Wbuf[i] = zero + t2;
}
if (idx < 16)
{
t2 = zero + Wbuf[idx];
return;
}
i = idx - 16;
while (1)
{
t2 = Wbuf[13] ^ Wbuf[8];
t2 = t2 ^ Wbuf[2];
t2 = t2 ^ Wbuf[0];
t2 = SHA1ROTATELEFT (t2, 1);
if (!i)
return;
memmove (Wbuf, Wbuf + 1, 60);
Wbuf[15] = t2;
i--;
}
}
void
do_sha1digest (void)
{
uint32_t k;
va = H[0];
vb = H[1];
vc = H[2];
vd = H[3];
ve = H[4];
for (idx = 0; idx <= 79; idx++)
{
if (idx <= 19)
{
k = k1;
t2 = vb ^ ffffffff;
t2 = t2 & vd;
t1 = vb & vc;
t1 = t2 | t1;
}
else if (idx >= 20 && idx <= 39)
{
k = k2;
t1 = vb ^ vc;
t1 = t1 ^ vd;
}
else if (idx >= 40 && idx <= 59)
{
k = k3;
t1 = vd & vb;
t2 = vc & vd;
t2 = t1 | t2;
t1 = vb & vc;
t1 = t2 | t1;
}
else if (idx >= 60 && idx <= 79)
{
k = k4;
t1 = vb ^ vc;
t1 = t1 ^ vd;
}
t1 = t1 + ve;
t1 = t1 + k;
get_w32_to_t2 ();
t1 = t1 + t2;
ve = vd;
vd = vc;
vc = vb;
vc = SHA1ROTATELEFT (vc, 30);
vb = va;
va = SHA1ROTATELEFT (va, 5);
va = va + t1;
}
H[0] += va;
H[1] += vb;
H[2] += vc;
H[3] += vd;
H[4] += ve;
}
void
show_w2 (void)
{
printf ("w2=");
for (idx = 0; idx < 80; ++idx)
{
get_w32_to_t2 ();
printf ("%08x", SWAB (t2));
}
printf ("\n");
}
void
show_data(void)
{
printf ("out=");
for (idx = 0; idx < 5; ++idx)
{
printf ("%08x", data[idx]);
}
printf ("\n");
}
void
sha1digest (void)
{
memcpy (H, HI, 20);
lidx = 0;
show_w2 ();
do_sha1digest ();
lidx = 1;
show_w2 ();
do_sha1digest ();
memcpy(data,H,20);
show_data();
} /* End of sha1digest() */
int
main (int argc, char *argv[])
{
uint32_t t = 0xa7a6;
int a;
data[0] = 0;
data[1] = t;
data[2] = zero;
data[2] ^= 0x80000000;
data2 = 0x00000240;
data[3] = zero;
data[4] = zero;
data[5] = zero;
set_key_or (0x36);
sha1digest ();
data[5] ^= 0x80000000;
data2 = 0x000002a0;
set_key_or (0x5c);
sha1digest ();
a=data[4] &0x0f;
t1=*(uint32_t*)( a+ (uint8_t *) data);
t1&=0x7fffffff;
printf("%d\n",t1);
return 0;
}
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