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sha1.c
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sha1.c
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/*
* sha1.c
*
* Originally witten by Steve Reid <steve@edmweb.com>
*
* Modified by Aaron D. Gifford <agifford@infowest.com>
*
* Also modified by Bruce Mitchener to copy data rather than trash it.
* using code from the original version by Steve Reid.
*
* NO COPYRIGHT - THIS IS 100% IN THE PUBLIC DOMAIN
*
* The original unmodified version is available at:
* ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <string.h>
//#include "sha.h"
/* Define this if your machine is LITTLE_ENDIAN, otherwise #undef it: */
#define LITTLE_ENDIAN
/* Make sure you define these types for your architecture: */
typedef unsigned int sha1_quadbyte; /* 4 byte type */
typedef unsigned char sha1_byte; /* single byte type */
/*
* Be sure to get the above definitions right. For instance, on my
* x86 based FreeBSD box, I define LITTLE_ENDIAN and use the type
* "unsigned long" for the quadbyte. On FreeBSD on the Alpha, however,
* while I still use LITTLE_ENDIAN, I must define the quadbyte type
* as "unsigned int" instead.
*/
#define SHA1_BLOCK_LENGTH 64
#define SHA1_DIGEST_LENGTH 20
/* The SHA1 structure: */
typedef struct _SHA_CTX {
sha1_quadbyte state[5];
sha1_quadbyte count[2];
sha1_byte buffer[SHA1_BLOCK_LENGTH];
} SHA_CTX;
//void SHA1_Init(SHA_CTX *context);
//void SHA1_Update(SHA_CTX *context, sha1_byte *data, unsigned int len);
//void SHA1_Final(sha1_byte digest[SHA1_DIGEST_LENGTH], SHA_CTX* context);
#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->l[i] = (rol(block->l[i],24)&(sha1_quadbyte)0xFF00FF00) \
|(rol(block->l[i],8)&(sha1_quadbyte)0x00FF00FF))
#else
#define blk0(i) block->l[i]
#endif
#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))
/* (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);
typedef union _BYTE64QUAD16 {
sha1_byte c[64];
sha1_quadbyte l[16];
} BYTE64QUAD16;
/* Hash a single 512-bit block. This is the core of the algorithm. */
void SHA1_Transform(sha1_quadbyte state[5], sha1_byte buffer[64]) {
sha1_quadbyte a, b, c, d, e;
BYTE64QUAD16 *block;
static unsigned char workspace[64];
block = (BYTE64QUAD16*)workspace;
memcpy(block, buffer, 64);
/* Copy context->state[] to working vars */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = 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[] */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
/* Wipe variables */
a = b = c = d = e = 0;
}
/* SHA1_Init - Initialize new context */
SHA_CTX* sha1_Init() {
SHA_CTX *context = malloc(sizeof(SHA_CTX));
/* SHA1 initialization constants */
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->count[0] = context->count[1] = 0;
return context;
}
/* Run your data through this. */
void sha1_Update(SHA_CTX *context, sha1_byte *data, unsigned int len) {
unsigned int i, j;
j = (context->count[0] >> 3) & 63;
if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
context->count[1] += (len >> 29);
if ((j + len) > 63) {
memcpy(&context->buffer[j], data, (i = 64-j));
SHA1_Transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64) {
SHA1_Transform(context->state, &data[i]);
}
j = 0;
}
else i = 0;
memcpy(&context->buffer[j], &data[i], len - i);
}
/* Add padding and return the message digest. */
void sha1_Final(sha1_byte digest[SHA1_DIGEST_LENGTH], SHA_CTX *context) {
sha1_quadbyte i, j;
sha1_byte finalcount[8];
for (i = 0; i < 8; i++) {
finalcount[i] = (sha1_byte)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
}
sha1_Update(context, (sha1_byte *)"\200", 1);
while ((context->count[0] & 504) != 448) {
sha1_Update(context, (sha1_byte *)"\0", 1);
}
/* Should cause a SHA1_Transform() */
sha1_Update(context, finalcount, 8);
for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
digest[i] = (sha1_byte)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
/* Wipe variables */
i = j = 0;
memset(context->buffer, 0, SHA1_BLOCK_LENGTH);
memset(context->state, 0, SHA1_DIGEST_LENGTH);
memset(context->count, 0, 8);
memset(&finalcount, 0, 8);
memset(context, 0, sizeof(*context));
/* make SHA1_Transform overwrite it's own static vars */
SHA1_Transform(context->state, context->buffer);
free(context);
}