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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];
uint32_t oldstate[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))
static const uint32_t rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
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)
{
int i, j, k, count;
uint32_t *block = this->buffer.i;
uint32_t *rot[5], *temp;
/* Copy context->state[] to working vars */
for (i=0; i<5; i++) {
this->oldstate[i] = this->state[i];
rot[i] = this->state + i;
}
/* 4 rounds of 20 operations each. */
for (i=count=0; i<4; i++) {
for (j=0; j<20; j++) {
uint32_t work;
work = *rot[2] ^ *rot[3];
if (!i) work = (work & *rot[1]) ^ *rot[3];
else {
if (i==2)
work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]);
else work ^= *rot[1];
}
if (!i && j<16) work += blk0(count);
else work += blk(count);
*rot[4] += work + rol(*rot[0],5) + rconsts[i];
*rot[1] = rol(*rot[1],30);
// Rotate by one for next time.
temp = rot[4];
for (k=4; k; k--) rot[k] = rot[k-1];
*rot = temp;
count++;
}
}
/* Add the previous values of state[] */
for (i=0; i<5; i++) this->state[i] += this->oldstate[i];
}
/* 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 */
memset(this, 0, sizeof(struct sha1));
}
/*************************************************************/
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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