5ae2eac4c16bdbbef032544bd9fc86f47e7bdc2cMark Andrews

5ae2eac4c16bdbbef032544bd9fc86f47e7bdc2cMark Andrews

5ae2eac4c16bdbbef032544bd9fc86f47e7bdc2cMark Andrews

#include "config.h"

#include <isc/assertions.h>

#include <isc/sha1.h>

#include <isc/string.h>

#include <isc/types.h>

#include <isc/util.h>

#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

#if !defined(WORDS_BIGENDIAN)

# 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))

#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 {

unsigned char c[64];

unsigned int l[16];

} CHAR64LONG16;

static void

transform(isc_uint32_t state[5], const unsigned char buffer[64]) {

isc_uint32_t a, b, c, d, e;

CHAR64LONG16 *block;

unsigned char workspace[64];

INSIST(buffer != NULL);

INSIST(state != NULL);

block = (CHAR64LONG16 *)(void *)workspace;

(void)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;

}

isc_sha1_init(isc_sha1_t *context)

{

INSIST(context != NULL);

/* 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] = 0;

context->count[1] = 0;

}

isc_sha1_invalidate(isc_sha1_t *context) {

memset(context, 0, sizeof(isc_sha1_t));

}

isc_sha1_update(isc_sha1_t *context, const unsigned char *data,

unsigned int len)

{

unsigned int i, j;

INSIST(context != 0);

INSIST(data != 0);

j = context->count[0];

if ((context->count[0] += len << 3) < j)

context->count[1] += (len >> 29) + 1;

j = (j >> 3) & 63;

if ((j + len) > 63) {

(void)memcpy(&context->buffer[j], data, (i = 64 - j));

transform(context->state, context->buffer);

for ( ; i + 63 < len; i += 64)

transform(context->state, &data[i]);

j = 0;

} else {

i = 0;

}

(void)memcpy(&context->buffer[j], &data[i], len - i);

}

static const unsigned char final_200 = 128;

static const unsigned char final_0 = 0;

isc_sha1_final(isc_sha1_t *context, unsigned char *digest) {

unsigned int i;

unsigned char finalcount[8];

INSIST(digest != 0);

INSIST(context != 0);

for (i = 0; i < 8; i++) {

/* Endian independent */

finalcount[i] = (unsigned char)

((context->count[(i >= 4 ? 0 : 1)]

>> ((3 - (i & 3)) * 8)) & 255);

}

isc_sha1_update(context, &final_200, 1);

while ((context->count[0] & 504) != 448)

isc_sha1_update(context, &final_0, 1);

/* The next Update should cause a transform() */

isc_sha1_update(context, finalcount, 8);

if (digest) {

for (i = 0; i < 20; i++)

digest[i] = (unsigned char)

((context->state[i >> 2]

>> ((3 - (i & 3)) * 8)) & 255);

}

memset(context, 0, sizeof(isc_sha1_t));

}