234 lines
7.5 KiB
C++
234 lines
7.5 KiB
C++
#include "rar.hpp"
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/*
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SHA-1 in C
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By Steve Reid <steve@edmweb.com>
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100% Public Domain
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Test Vectors (from FIPS PUB 180-1)
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"abc"
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A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
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"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
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84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
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A million repetitions of "a"
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34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
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*/
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#if !defined(LITTLE_ENDIAN) && !defined(BIG_ENDIAN)
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#if defined(_M_IX86) || defined(_M_I86) || defined(__alpha)
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#define LITTLE_ENDIAN
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#else
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#error "LITTLE_ENDIAN or BIG_ENDIAN must be defined"
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#endif
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#endif
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/* #define SHA1HANDSOFF * Copies data before messing with it. */
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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/* blk0() and blk() perform the initial expand. */
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/* I got the idea of expanding during the round function from SSLeay */
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#ifdef LITTLE_ENDIAN
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#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
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|(rol(block->l[i],8)&0x00FF00FF))
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#else
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#define blk0(i) block->l[i]
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#endif
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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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/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
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#define R0(v,w,x,y,z,i) {z+=((w&(x^y))^y)+blk0(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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/* Hash a single 512-bit block. This is the core of the algorithm. */
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void SHA1Transform(uint32 state[5], unsigned char buffer[64], bool handsoff)
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{
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#ifndef SFX_MODULE
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uint32 a, b, c, d, e;
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#endif
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typedef union {
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unsigned char c[64];
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uint32 l[16];
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} CHAR64LONG16;
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CHAR64LONG16* block;
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static unsigned char workspace[64];
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if (handsoff)
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{
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block = (CHAR64LONG16*)workspace;
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memcpy(block, buffer, 64);
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}
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else
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block = (CHAR64LONG16*)buffer;
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#ifdef SFX_MODULE
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static int pos[80][5];
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static bool pinit=false;
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if (!pinit)
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{
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for (int I=0,P=0;I<80;I++,P=(P ? P-1:4))
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{
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pos[I][0]=P;
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pos[I][1]=(P+1)%5;
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pos[I][2]=(P+2)%5;
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pos[I][3]=(P+3)%5;
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pos[I][4]=(P+4)%5;
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}
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pinit=true;
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}
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uint32 s[5];
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for (int I=0;I<sizeof(s)/sizeof(s[0]);I++)
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s[I]=state[I];
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for (int I=0;I<16;I++)
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R0(s[pos[I][0]],s[pos[I][1]],s[pos[I][2]],s[pos[I][3]],s[pos[I][4]],I);
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for (int I=16;I<20;I++)
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R1(s[pos[I][0]],s[pos[I][1]],s[pos[I][2]],s[pos[I][3]],s[pos[I][4]],I);
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for (int I=20;I<40;I++)
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R2(s[pos[I][0]],s[pos[I][1]],s[pos[I][2]],s[pos[I][3]],s[pos[I][4]],I);
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for (int I=40;I<60;I++)
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R3(s[pos[I][0]],s[pos[I][1]],s[pos[I][2]],s[pos[I][3]],s[pos[I][4]],I);
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for (int I=60;I<80;I++)
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R4(s[pos[I][0]],s[pos[I][1]],s[pos[I][2]],s[pos[I][3]],s[pos[I][4]],I);
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for (int I=0;I<sizeof(s)/sizeof(s[0]);I++)
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state[I]+=s[I];
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#else
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/* Copy context->state[] to working vars */
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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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/* 4 rounds of 20 operations each. Loop unrolled. */
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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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/* Add the working vars back into context.state[] */
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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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/* Wipe variables */
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a = b = c = d = e = 0;
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memset(&a,0,sizeof(a));
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#endif
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}
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/* Initialize new context */
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void hash_initial(hash_context* context)
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{
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/* SHA1 initialization constants */
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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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/* Run your data through this. */
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void hash_process( hash_context * context, unsigned char * data, size_t len,
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bool handsoff )
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{
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unsigned int i, j;
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uint blen = ((uint)len)<<3;
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j = (context->count[0] >> 3) & 63;
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if ((context->count[0] += blen) < blen ) context->count[1]++;
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context->count[1] += (uint32)(len >> 29);
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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, handsoff);
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for ( ; i + 63 < len; i += 64) {
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#ifdef ALLOW_NOT_ALIGNED_INT
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SHA1Transform(context->state, &data[i], handsoff);
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#else
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unsigned char buffer[64];
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memcpy(buffer,data+i,sizeof(buffer));
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SHA1Transform(context->state, buffer, handsoff);
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memcpy(data+i,buffer,sizeof(buffer));
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#endif
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#ifdef BIG_ENDIAN
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if (!handsoff)
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{
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unsigned char *d=data+i;
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for (int k=0;k<64;k+=4)
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{
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byte b0=d[k],b1=d[k+1];
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d[k]=d[k+3];
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d[k+1]=d[k+2];
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d[k+2]=b1;
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d[k+3]=b0;
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}
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}
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#endif
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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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if (len > i)
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memcpy(&context->buffer[j], &data[i], len - i);
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}
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/* Add padding and return the message digest. */
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void hash_final( hash_context* context, uint32 digest[5], bool handsoff)
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{
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uint i, j;
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unsigned char finalcount[8];
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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); /* Endian independent */
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}
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unsigned char ch=(unsigned char)'\200';
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hash_process(context, &ch, 1, handsoff);
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while ((context->count[0] & 504) != 448) {
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ch=0;
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hash_process(context, &ch, 1, handsoff);
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}
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hash_process(context, finalcount, 8, handsoff); /* Should cause a SHA1Transform() */
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for (i = 0; i < 5; i++) {
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digest[i] = context->state[i] & 0xffffffff;
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}
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/* Wipe variables */
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memset(&i,0,sizeof(i));
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memset(&j,0,sizeof(j));
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memset(context->buffer, 0, 64);
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memset(context->state, 0, 20);
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memset(context->count, 0, 8);
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memset(&finalcount, 0, 8);
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if (handsoff)
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SHA1Transform(context->state, context->buffer, true);
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}
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