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checksum_sha1.c
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checksum_sha1.c
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/**
* MojoSetup; a portable, flexible installation application.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#include "universal.h"
#if SUPPORT_SHA1
// SHA-1 code originally from ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
// License: public domain.
// I cleaned it up a little for MojoSetup's specific purposes. --ryan.
/*
SHA-1 in C
By Steve Reid <steve@edmweb.com>
100% Public Domain
Test Vectors (from FIPS PUB 180-1)
"abc"
A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
A million repetitions of "a"
34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
*/
#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 */
#if PLATFORM_LITTLEENDIAN
#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
|(rol(block->l[i],8)&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);
/* Hash a single 512-bit block. This is the core of the algorithm. */
static void MojoSha1_transform(uint32 state[5], const uint8 buffer[64])
{
uint32 a, b, c, d, e;
typedef union {
uint8 c[64];
uint32 l[16];
} CHAR64LONG16;
CHAR64LONG16* block;
static uint8 workspace[64];
block = (CHAR64LONG16*)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;
}
/* MojoSha1_init - Initialize new context */
void MojoSha1_init(MojoSha1 *context)
{
/* 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;
}
/* Run your data through this. */
void MojoSha1_append(MojoSha1 *context, const uint8 *data, uint32 len)
{
uint32 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));
MojoSha1_transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64) {
MojoSha1_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 MojoSha1_finish(MojoSha1 *context, uint8 digest[20])
{
uint32 i;
uint8 finalcount[8];
for (i = 0; i < 8; i++) {
finalcount[i] = (uint8)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
}
MojoSha1_append(context, (uint8 *)"\200", 1);
while ((context->count[0] & 504) != 448) {
MojoSha1_append(context, (uint8 *)"\0", 1);
}
MojoSha1_append(context, finalcount, 8); /* Should cause a MojoSha1_transform() */
for (i = 0; i < 20; i++) {
digest[i] = (uint8)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
/* Wipe variables */
memset(context->buffer, 0, 64);
memset(context->state, 0, 20);
memset(context->count, 0, 8);
memset(&finalcount, 0, 8);
MojoSha1_transform(context->state, context->buffer);
}
#endif // SUPPORT_SHA1
#if TEST_SHA1
int main(int argc, char **argv)
{
int i = 0;
for (i = 1; i < argc; i++)
{
FILE *in = NULL;
MojoSha1 ctx;
MojoSha1_init(&ctx);
in = fopen(argv[i], "rb");
if (!in)
perror("fopen");
else
{
uint8 dig[20];
int err = 0;
while ( (!err) && (!feof(in)) )
{
uint8 buf[1024];
size_t rc = fread(buf, 1, sizeof (buf), in);
if (rc > 0)
MojoSha1_append(&ctx, buf, rc);
err = ferror(in);
} // while
if (err)
perror("fread");
fclose(in);
MojoSha1_finish(&ctx, dig);
if (!err)
{
printf("%s: %x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x\n",
argv[i],
(int) dig[0], (int) dig[1], (int) dig[2], (int) dig[3],
(int) dig[4], (int) dig[5], (int) dig[6], (int) dig[7],
(int) dig[8], (int) dig[9], (int) dig[10], (int) dig[11],
(int) dig[12], (int) dig[13], (int) dig[14], (int) dig[15],
(int) dig[16], (int) dig[17], (int) dig[18], (int) dig[19]);
} // if
} // else
} // for
return 0;
} // main
#endif
// end of checksum_sha1.c ...