142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/* Copyright(c) By Steve Reid <steve@edmweb.com> */
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/* 100% Public Domain */
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#ifndef NS_DISABLE_SHA1
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#include <string.h>
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#include "sha1.h"
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static int is_big_endian(void) {
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static const int n = 1;
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return ((char *) &n)[0] == 0;
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}
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#define SHA1HANDSOFF
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#if defined(__sun)
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#include "solarisfixes.h"
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#endif
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union char64long16 { unsigned char c[64]; uint32_t l[16]; };
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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static uint32_t blk0(union char64long16 *block, int i) {
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/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
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if (!is_big_endian()) {
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block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
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(rol(block->l[i], 8) & 0x00FF00FF);
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}
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return block->l[i];
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}
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/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
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#undef blk
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#undef R0
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#undef R1
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#undef R2
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#undef R3
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#undef R4
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#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
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^block->l[(i+2)&15]^block->l[i&15],1))
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#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
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uint32_t a, b, c, d, e;
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union char64long16 block[1];
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memcpy(block, buffer, 64);
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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/* Erase working structures. The order of operations is important,
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* used to ensure that compiler doesn't optimize those out. */
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memset(block, 0, sizeof(block));
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a = b = c = d = e = 0;
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(void) a; (void) b; (void) c; (void) d; (void) e;
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}
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void SHA1Init(SHA1_CTX *context) {
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context->state[0] = 0x67452301;
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context->state[1] = 0xEFCDAB89;
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context->state[2] = 0x98BADCFE;
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context->state[3] = 0x10325476;
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context->state[4] = 0xC3D2E1F0;
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context->count[0] = context->count[1] = 0;
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}
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void SHA1Update(SHA1_CTX *context, const unsigned char *data, uint32_t len) {
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uint32_t i, j;
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j = context->count[0];
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if ((context->count[0] += len << 3) < j)
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context->count[1]++;
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context->count[1] += (len>>29);
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j = (j >> 3) & 63;
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if ((j + len) > 63) {
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memcpy(&context->buffer[j], data, (i = 64-j));
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SHA1Transform(context->state, context->buffer);
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for ( ; i + 63 < len; i += 64) {
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SHA1Transform(context->state, &data[i]);
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}
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j = 0;
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}
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else i = 0;
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memcpy(&context->buffer[j], &data[i], len - i);
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}
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void SHA1Final(unsigned char digest[20], SHA1_CTX *context) {
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unsigned i;
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unsigned char finalcount[8], c;
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for (i = 0; i < 8; i++) {
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finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
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>> ((3-(i & 3)) * 8) ) & 255);
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}
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c = 0200;
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SHA1Update(context, &c, 1);
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while ((context->count[0] & 504) != 448) {
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c = 0000;
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SHA1Update(context, &c, 1);
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}
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SHA1Update(context, finalcount, 8);
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for (i = 0; i < 20; i++) {
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digest[i] = (unsigned char)
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((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
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}
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memset(context, '\0', sizeof(*context));
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memset(&finalcount, '\0', sizeof(finalcount));
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}
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#endif /* NS_DISABLE_SHA1 */
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