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/* NOM........ sha.c */
/* OBJET...... Secure Hash Algorithm and K-HMAC */
/* PROJET..... SFP V.1 */
/* REFERENCES. */
/* VERSION.... 1.0 */
/* HISTORIQUE. */
/**/
/*---------------------------------------------------------*/
/* Include Files */
/*---------------------------------------------------------*/
#include <string.h>
#include <stdio.h>
#include "limits.h"
#include "float.h"
#include "sha.h"
#if !defined(MAXSHORT)
#define MAXSHORT SHRT_MAX
#endif
/*---------------------------------------------------------*/
/* Prototypes definition */
/*---------------------------------------------------------*/
int Is64or32(void);
void ShaProc64(unsigned char*,int,unsigned char*);
void ShaProc32(unsigned char*,int,unsigned char*);
/*---------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------*/
static unsigned int W64[80]; /* Word Input Sequence */
static unsigned int H64[5]; /* 160 Bits Message Digest */
static unsigned int A64,B64,C64,D64,E64; /* A, B, C, D, E Registers for 80 Rounds */
/* Declaration for 32 bits patform */
static unsigned long W32[80]; /* Word Input Sequence */
static unsigned long H32[5]; /* 160 Bits Message Digest */
static unsigned long A32,B32,C32,D32,E32; /* A, B, C, D, E Registers for 80 Rounds */
static unsigned char lastBlock[64]; /* Last Block To Hash */
/*--------------------------------------------------------------
* Is64or32()
*---------------------------------------------------------
*/
int Is64or32()
{
if (MAXSHORT>0x7FFF) return 64;else return 32;
}
/*---------------------------------------------------------*/
/* ShaProc() */
/*---------------------------------------------------------*/
/* Secure Hash Algorithm Computing (Length < 32K) */
/**/
void ShaProc(unsigned char* entry,int len,unsigned char* exit)
{
if (Is64or32()==64) ShaProc64(entry,len,exit);
else ShaProc32(entry,len,exit);
}
/*---------------------------------------------------------*/
/* ShaProc64() */
/*---------------------------------------------------------*/
/* Secure Hash Algorithm Computing (Length < 32K) */
/**/
void ShaProc64(unsigned char* entry,int len,unsigned char* exit)
{
unsigned int iter; /* Number of 512 Bits Blocks */
int lg; /* Length To Process */
unsigned int val; /* Temporary Value */
unsigned char* pe; /* Entry Pointer */
int i; /* Item Loop */
/* 1. Initialization */
H64[0]=0x67452301L;
H64[1]=0xEFCDAB89L;
H64[2]=0x98BADCFEL;
H64[3]=0x10325476L;
H64[4]=0xC3D2E1F0L;
iter=(len+72)>>6;
/* 2. Message Block Processing */
for(pe=entry,lg=len; iter>0; iter--,lg-=64){
/* 2.1 Message Padding */
if (lg<64){
memset(lastBlock,0,sizeof(lastBlock));
if (lg>0) memcpy(lastBlock,pe,lg);
if (lg>=0) lastBlock[lg]=0x80;
if (lg<=55){
lastBlock[61]=(unsigned char)(len>>13);
lastBlock[62]=(unsigned char)(len>>5);
lastBlock[63]=(unsigned char)((len<<3)&0xFF);
}
pe=lastBlock;
}
/* 2.2 Divide Mi Into W0,...,W15 (step a) */
for(i=0; i<64; i++)
W64[i>>2]=(W64[i>>2]<<8)+*pe++;
/* 2.3 Processing W16 To W79 - Init A To E (step b c) */
for(i=16; i<80; i++){
val=W64[i-3]^W64[i-8]^W64[i-14]^W64[i-16];
W64[i]=(val<<1)+(val>>31);
}
A64=H64[0]; B64=H64[1]; C64=H64[2]; D64=H64[3]; E64=H64[4];
/* 2.4 Round 0 To 79 (step d) */
for(i=0; i<20; i++){
val=(A64<<5)+(A64>>27)+((B64&C64)|((~B64)&D64))+E64+W64[i]+0x5A827999L;
E64=D64; D64=C64; C64=(B64<<30)+(B64>>2); B64=A64; A64=val;
}
for(; i<40; i++){
val=(A64<<5)+(A64>>27)+(B64^C64^D64)+E64+W64[i]+0x6ED9EBA1L;
E64=D64; D64=C64; C64=(B64<<30)+(B64>>2); B64=A64; A64=val;
}
for(; i<60; i++){
val=(A64<<5)+(A64>>27)+((B64&C64)|(B64&D64)|(C64&D64))+E64+W64[i]+0x8F1BBCDCL;
E64=D64; D64=C64; C64=(B64<<30)+(B64>>2); B64=A64; A64=val;
}
for(; i<80; i++){
val=(A64<<5)+(A64>>27)+(B64^C64^D64)+E64+W64[i]+0xCA62C1D6L;
E64=D64; D64=C64; C64=(B64<<30)+(B64>>2); B64=A64; A64=val;
}
/* 2.5 Update Digest (step e) */
H64[0]+=A64; H64[1]+=B64; H64[2]+=C64; H64[3]+=D64; H64[4]+=E64;
}
/* 3. Message Digest */
for(i=19,exit+=19; i>=0; i--){
*(exit--)=(unsigned char)(H64[i>>2]&0xFF);
H64[i>>2]>>=8;
}
}
/*---------------------------------------------------------*/
/* ShaProc32() */
/*---------------------------------------------------------*/
/* Secure Hash Algorithm Computing (Length < 32K) */
/**/
void ShaProc32(unsigned char* entry,int len,unsigned char* exit)
{
unsigned int iter; /* Number of 512 Bits Blocks */
int lg; /* Length To Process */
unsigned long val; /* Temporary Value */
unsigned char* pe; /* Entry Pointer */
int i; /* Item Loop */
/* 1. Initialization */
H32[0]=0x67452301L;
H32[1]=0xEFCDAB89L;
H32[2]=0x98BADCFEL;
H32[3]=0x10325476L;
H32[4]=0xC3D2E1F0L;
iter=(len+72)>>6;
/* 2. Message Block Processing */
for(pe=entry,lg=len; iter>0; iter--,lg-=64){
/* 2.1 Message Padding */
if (lg<64){
memset(lastBlock,0,sizeof(lastBlock));
if (lg>0) memcpy(lastBlock,pe,lg);
if (lg>=0) lastBlock[lg]=0x80;
if (lg<=55){
lastBlock[61]=(unsigned char)(len>>13);
lastBlock[62]=(unsigned char)(len>>5);
lastBlock[63]=(unsigned char)((len<<3)&0xFF);
}
pe=lastBlock;
}
/* 2.2 Divide Mi Into W0,...,W15 (step a) */
for(i=0; i<64; i++)
W32[i>>2]=(W32[i>>2]<<8)+*pe++;
/* 2.3 Processing W16 To W79 - Init A To E (step b c) */
for(i=16; i<80; i++){
val=W32[i-3]^W32[i-8]^W32[i-14]^W32[i-16];
W32[i]=(val<<1)+(val>>31);
}
A32=H32[0]; B32=H32[1]; C32=H32[2]; D32=H32[3]; E32=H32[4];
/* 2.4 Round 0 To 79 (step d) */
for(i=0; i<20; i++){
val=(A32<<5)+(A32>>27)+((B32&C32)|((~B32)&D32))+E32+W32[i]+0x5A827999L;
E32=D32; D32=C32; C32=(B32<<30)+(B32>>2); B32=A32; A32=val;
}
for(; i<40; i++){
val=(A32<<5)+(A32>>27)+(B32^C32^D32)+E32+W32[i]+0x6ED9EBA1L;
E32=D32; D32=C32; C32=(B32<<30)+(B32>>2); B32=A32; A32=val;
}
for(; i<60; i++){
val=(A32<<5)+(A32>>27)+((B32&C32)|(B32&D32)|(C32&D32))+E32+W32[i]+0x8F1BBCDCL;
E32=D32; D32=C32; C32=(B32<<30)+(B32>>2); B32=A32; A32=val;
}
for(; i<80; i++){
val=(A32<<5)+(A32>>27)+(B32^C32^D32)+E32+W32[i]+0xCA62C1D6L;
E32=D32; D32=C32; C32=(B32<<30)+(B32>>2); B32=A32; A32=val;
}
/* 2.5 Update Digest (step e) */
H32[0]+=A32; H32[1]+=B32; H32[2]+=C32; H32[3]+=D32; H32[4]+=E32;
}
/* 3. Message Digest */
for(i=19,exit+=19; i>=0; i--){
*(exit--)=(unsigned char)(H32[i>>2]&0xFF);
H32[i>>2]>>=8;
}
}
/*---------------------------------------------------------*/
/* Hmac() */
/*---------------------------------------------------------*/
/* SHA-1 Keyed Hash MAC
*/
void Hmac(unsigned char* key,int keyLn,unsigned char* text,int textLn,unsigned char* out)
{
unsigned char pad[1064]; /* Padding */
int i; /* Item Loop */
unsigned char* pc; /* Data Pointer */
memset(pad,0x36,64);
for(i=0,pc=key; i<keyLn; )
pad[i++]^=*pc++;
memcpy(pad+64,text,textLn);
ShaProc(pad,64+textLn,pad+64);
memset(pad,0x5C,64);
for(i=0,pc=key; i<keyLn; )
pad[i++]^=*pc++;
ShaProc(pad,64+20,out);
}
/*---------------------------------------------------------*/
/* ConvertInAsciiStream() */
/*---------------------------------------------------------*/
void ConvertInAsciiStream (unsigned char* bufIn, unsigned char bufLg, unsigned char *out)
{
int i; /* Item Loop */
unsigned char v;
for(i=0; i<bufLg; i++) {
v=(unsigned char)(*bufIn>>4);
if (v>9) *out++=(unsigned char)(v+0x37); else *out++=(unsigned char)(v+0x30);
v=(unsigned char)(*bufIn++&0x0f);
if (v>9) *out++=(unsigned char)(v+0x37); else *out++=(unsigned char)(v+0x30);
}
}
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