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/*
* Based on the public domain SHA-1 in C by Steve Reid <steve@edmweb.com>
* from http://www.mirrors.wiretapped.net/security/cryptography/hashes/sha1/
*/
/* #define LITTLE_ENDIAN * This should be #define'd if true. */
/* #define SHA1HANDSOFF * Copies data before messing with it. */
#define LITTLE_ENDIAN
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
struct sha1 {
uint32_t state[5];
uint64_t count;
union {
unsigned char c[64];
uint32_t i[16];
} buffer;
};
void sha1_init(struct sha1 *this);
void sha1_transform(struct sha1 *this);
void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len);
void sha1_final(struct sha1 *this, unsigned char digest[20]);
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
/* blk0() and blk() perform the initial expand. */
/* I got the idea of expanding during the round function from SSLeay */
#ifdef LITTLE_ENDIAN
#define blk0(i) (block[i] = (rol(block[i],24)&0xFF00FF00) \
|(rol(block[i],8)&0x00FF00FF))
#else
#define blk0(i) block[i]
#endif
#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15] \
^block[(i+2)&15]^block[i&15],1))
/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(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);
void printy(unsigned char *this)
{
int i;
for (i = 0; i < 20; i++) printf("%02x", this[i]);
putchar('\n');
}
/* Hash a single 512-bit block. This is the core of the algorithm. */
void sha1_transform(struct sha1 *this)
{
unsigned int a, b, c, d, e;
uint32_t *block = this->buffer.i;
/* Copy context->state[] to working vars */
a = this->state[0];
b = this->state[1];
c = this->state[2];
d = this->state[3];
e = this->state[4];
/* 4 rounds of 20 operations each. Loop unrolled. */
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);
/* Add the working vars back into context.state[] */
this->state[0] += a;
this->state[1] += b;
this->state[2] += c;
this->state[3] += d;
this->state[4] += e;
printy(this->state);
/* Wipe variables */
a = b = c = d = e = 0;
}
/* SHA1Init - Initialize new context */
void sha1_init(struct sha1 *this)
{
/* SHA1 initialization constants */
this->state[0] = 0x67452301;
this->state[1] = 0xEFCDAB89;
this->state[2] = 0x98BADCFE;
this->state[3] = 0x10325476;
this->state[4] = 0xC3D2E1F0;
this->count = 0;
}
/* Run your data through this function. */
void sha1_update(struct sha1 *this, unsigned char *data, unsigned int len)
{
unsigned int i, j;
j = this->count & 63;
this->count += len;
// Enough data to process a frame?
if ((j + len) > 63) {
i = 64-j;
memcpy(this->buffer.c + j, data, i);
sha1_transform(this);
for ( ; i + 63 < len; i += 64) {
memcpy(this->buffer.c, data + i, 64);
sha1_transform(this);
}
j = 0;
} else i = 0;
// Grab remaining chunk
memcpy(this->buffer.c + j, data + i, len - i);
}
/* Add padding and return the message digest. */
void sha1_final(struct sha1 *this, unsigned char digest[20])
{
uint64_t count = this->count << 3;
unsigned int i;
unsigned char buf;
// End the message by appending a "1" bit to the data, ending with the
// message size (in bits, big endian), and adding enough zero bits in
// between to pad to the end of the next 64-byte frame. Since our input
// up to now has been in whole bytes, we can deal with bytes here too.
buf = 0x80;
do {
sha1_update(this, &buf, 1);
buf = 0;
} while ((this->count & 63) != 56);
for (i = 0; i < 8; i++)
this->buffer.c[56+i] = count >> (8*(7-i));
sha1_transform(this);
for (i = 0; i < 20; i++) {
digest[i] = (unsigned char)
((this->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
/* Wipe variables */
i = 0;
}
/*************************************************************/
int main(int argc, char** argv)
{
int i, j;
struct sha1 this;
unsigned char digest[20], buffer[16384];
FILE* file;
if (argc < 2) {
file = stdin;
}
else {
if (!(file = fopen(argv[1], "rb"))) {
fputs("Unable to open file.", stderr);
exit(-1);
}
}
sha1_init(&this);
while (!feof(file)) { /* note: what if ferror(file) */
i = fread(buffer, 1, 16384, file);
sha1_update(&this, buffer, i);
}
sha1_final(&this, digest);
fclose(file);
printy(digest);
exit(0);
}
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