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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>
uint8_t key[]={ 0x89,0x0e,0x38,0x6e, 0xbb,0x3c,0xcf, 0xe9,0x00,0x00,0x4f,0xe4};
uint8_t msg[]={ 0x00,0x00,0x00,0x00,0xa6,0xa7,0x00,0x00};
uint8_t data[24];
uint32_t data2;
uint8_t w2[16];
uint8_t dlen;
uint32_t key_or;
uint8_t buf[128];
uint32_t get_w32_016(int idx,int loop)
{
uint32_t t1;
if (!loop) {
if (idx<3) {
memcpy(&t1,&key[idx<<2],4);
} else {
memset(&t1,0,4);
}
t1^=key_or;
return t1;
}
if (idx<dlen) {
memcpy(&t1,&data[idx<<2],4);
return t1;
}
if (idx<15)
return 0;
return data2;
}
#define SHA1ROTATELEFT(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
uint32_t Wbuf[16];
uint32_t get_w32(int idx,int loop)
{
int i;
uint32_t t2;
for (i=0;i<16;++i)
Wbuf[i]=get_w32_016(i,loop);
if (idx<16)
return Wbuf[idx];
idx-=16;
while (1) {
t2=SHA1ROTATELEFT(Wbuf[13] ^Wbuf[8] ^ Wbuf[2] ^ Wbuf[0],1);
if (!idx) return t2;
memmove(Wbuf,Wbuf+1,60);
Wbuf[15]=t2;
idx--;
}
}
int
sha1digest(uint8_t *digest)
{
uint32_t H[] = {0x67452301,
0xEFCDAB89,
0x98BADCFE,
0x10325476,
0xC3D2E1F0};
uint32_t a;
uint32_t b;
uint32_t c;
uint32_t d;
uint32_t e;
uint32_t f = 0;
uint32_t k = 0;
uint32_t idx;
uint32_t lidx;
uint32_t widx;
uint32_t didx = 0;
int32_t wcount;
uint32_t temp;
uint8_t datatail[128] = {0};
/* Process each 512-bit chunk */
for (lidx = 0; lidx < 2; lidx++)
{
{
uint32_t w;;
printf("w2=");
for (idx=0;idx<80;++idx) {
w=get_w32(idx,lidx);
printf("%02x%02x%02x%02x",
(w>>0) &0xff,
(w>>8) &0xff,
(w>>16) &0xff,
(w>>24) &0xff);
}
printf("\n");
}
/* Main loop */
a = H[0];
b = H[1];
c = H[2];
d = H[3];
e = H[4];
for (idx = 0; idx <= 79; idx++)
{
if (idx <= 19)
{
f = (b & c) | ((~b) & d);
k = 0x5A827999;
}
else if (idx >= 20 && idx <= 39)
{
f = b ^ c ^ d;
k = 0x6ED9EBA1;
}
else if (idx >= 40 && idx <= 59)
{
f = (b & c) | (b & d) | (c & d);
k = 0x8F1BBCDC;
}
else if (idx >= 60 && idx <= 79)
{
f = b ^ c ^ d;
k = 0xCA62C1D6;
}
temp = SHA1ROTATELEFT (a, 5) + f + e + k + get_w32(idx,lidx);
e = d;
d = c;
c = SHA1ROTATELEFT (b, 30);
b = a;
a = temp;
}
H[0] += a;
H[1] += b;
H[2] += c;
H[3] += d;
H[4] += e;
}
/* Store binary digest in supplied buffer */
if (digest)
{
for (idx = 0; idx < 5; idx++)
{
digest[idx * 4 + 0] = (uint8_t) (H[idx] >> 0);
digest[idx * 4 + 1] = (uint8_t) (H[idx] >> 8);
digest[idx * 4 + 2] = (uint8_t) (H[idx] >> 16);
digest[idx * 4 + 3] = (uint8_t) (H[idx] >> 24);
}
}
printf("out=");
for (idx=0;idx<20;++idx) {
printf("%02x",digest[idx]);
}
printf("\n");
return 0;
} /* End of sha1digest() */
int main(int argc,char * argv[])
{
int i;
memcpy(data,msg,8);
data[8]=0;
data[9]=0;
data[10]=0;
data[11]=0x80;
data2=0x00000240;
key_or=0x36363636;
dlen=3;
sha1digest(data);
data[20]=0;
data[21]=0;
data[22]=0;
data[23]=0x80;
data2=0x000002a0;
key_or=0x5c5c5c5c;
dlen=6;
sha1digest(buf);
for (i=0;i<20;++i)
{
printf("%02x",buf[i]);
}
printf("\n");
return 0;
}
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