sha1.c File Reference

#include "sha1.h"

Include dependency graph for sha1.c:

Go to the source code of this file.

Macros
#define	rol(value, bits)   (((value) << (bits)) | ((value) >> (32 - (bits))))
#define	DWORD2BE(x)   (((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000);
#define	blk0(i)   (Block[i] = (rol(Block[i],24)&0xFF00FF00)|(rol(Block[i],8)&0x00FF00FF))
#define	blk1(i)   (Block[i&15] = rol(Block[(i+13)&15]^Block[(i+8)&15]^Block[(i+2)&15]^Block[i&15],1))
#define	f1(x, y, z)   (z^(x&(y^z)))
#define	f2(x, y, z)   (x^y^z)
#define	f3(x, y, z)   ((x&y)|(z&(x|y)))
#define	f4(x, y, z)   (x^y^z)
#define	R0(v, w, x, y, z, i)   z+=f1(w,x,y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define	R1(v, w, x, y, z, i)   z+=f1(w,x,y)+blk1(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define	R2(v, w, x, y, z, i)   z+=f2(w,x,y)+blk1(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define	R3(v, w, x, y, z, i)   z+=f3(w,x,y)+blk1(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define	R4(v, w, x, y, z, i)   z+=f4(w,x,y)+blk1(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);

Functions
static void	SHA1Transform (ULONG State[5], UCHAR Buffer[64])
VOID NTAPI	A_SHAInit (PSHA_CTX Context)
VOID NTAPI	A_SHAUpdate (PSHA_CTX Context, const unsigned char *Buffer, ULONG BufferSize)
VOID NTAPI	A_SHAFinal (PSHA_CTX Context, PULONG Result)

Macro Definition Documentation

blk0

#define blk0

(

i

)

(Block[i] = (rol(Block[i],24)&0xFF00FF00)|(rol(Block[i],8)&0x00FF00FF))

Definition at line 28 of file sha1.c.

blk1

#define blk1

(

i

)

(Block[i&15] = rol(Block[(i+13)&15]^Block[(i+8)&15]^Block[(i+2)&15]^Block[i&15],1))

Definition at line 29 of file sha1.c.

DWORD2BE

#define DWORD2BE

(

x

)

(((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000);

Definition at line 26 of file sha1.c.

f1

#define f1	(		x,
			y,
			z
	)		(z^(x&(y^z)))

Definition at line 30 of file sha1.c.

f2

#define f2	(		x,
			y,
			z
	)		(x^y^z)

Definition at line 31 of file sha1.c.

f3

#define f3	(		x,
			y,
			z
	)		((x&y)|(z&(x|y)))

Definition at line 32 of file sha1.c.

f4

#define f4	(		x,
			y,
			z
	)		(x^y^z)

Definition at line 33 of file sha1.c.

R0

#define R0	(		v,
			w,
			x,
			y,
			z,
			i
	)		z+=f1(w,x,y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);

Definition at line 35 of file sha1.c.

R1

#define R1	(		v,
			w,
			x,
			y,
			z,
			i
	)		z+=f1(w,x,y)+blk1(i)+0x5A827999+rol(v,5);w=rol(w,30);

Definition at line 36 of file sha1.c.

R2

#define R2	(		v,
			w,
			x,
			y,
			z,
			i
	)		z+=f2(w,x,y)+blk1(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);

Definition at line 37 of file sha1.c.

R3

#define R3	(		v,
			w,
			x,
			y,
			z,
			i
	)		z+=f3(w,x,y)+blk1(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);

Definition at line 38 of file sha1.c.

R4

#define R4	(		v,
			w,
			x,
			y,
			z,
			i
	)		z+=f4(w,x,y)+blk1(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);

Definition at line 39 of file sha1.c.

rol

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

Definition at line 24 of file sha1.c.

Function Documentation

A_SHAFinal()

VOID NTAPI A_SHAFinal	(	PSHA_CTX	Context,
		PULONG	Result
	)

Definition at line 171 of file sha1.c.

{
   INT Pad, Index;
   UCHAR Buffer[72];
   ULONG *Count;
   ULONG BufferContentSize, LengthHi, LengthLo;
 
   BufferContentSize = Context->Count[1] & 63;
   if (BufferContentSize >= 56)
      Pad = 56 + 64 - BufferContentSize;
   else
      Pad = 56 - BufferContentSize;
 
   LengthHi = (Context->Count[0] << 3) | (Context->Count[1] >> (32 - 3));
   LengthLo = (Context->Count[1] << 3);
 
   memset(Buffer + 1, 0, Pad - 1);
   Buffer[0] = 0x80;
   Count = (ULONG*)(Buffer + Pad);
   Count[0] = DWORD2BE(LengthHi);
   Count[1] = DWORD2BE(LengthLo);
   A_SHAUpdate(Context, Buffer, Pad + 8);
 
   for (Index = 0; Index < 5; Index++)
      Result[Index] = DWORD2BE(Context->State[Index]);
 
   memset(Context->Buffer, 0, sizeof(Context->Buffer));
   A_SHAInit(Context);
}

Referenced by finalize_hash_impl(), sha_check(), and VerifyInteg().

A_SHAInit()

VOID NTAPI A_SHAInit

(

PSHA_CTX

Context

)

Definition at line 102 of file sha1.c.

{
   /* 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;
}

Referenced by A_SHAFinal(), init_hash_impl(), sha_check(), and VerifyInteg().

A_SHAUpdate()

VOID NTAPI A_SHAUpdate	(	PSHA_CTX	Context,
		const unsigned char *	Buffer,
		ULONG	BufferSize
	)

Definition at line 128 of file sha1.c.

{
   ULONG BufferContentSize;
 
   BufferContentSize = Context->Count[1] & 63;
   Context->Count[1] += BufferSize;
   if (Context->Count[1] < BufferSize)
      Context->Count[0]++;
   Context->Count[0] += (BufferSize >> 29);
 
   if (BufferContentSize + BufferSize < 64)
   {
      memcpy(&Context->Buffer[BufferContentSize], Buffer,
                    BufferSize);
   }
   else
   {
      while (BufferContentSize + BufferSize >= 64)
      {
         memcpy(Context->Buffer + BufferContentSize, Buffer,
                       64 - BufferContentSize);
         Buffer += 64 - BufferContentSize;
         BufferSize -= 64 - BufferContentSize;
         SHA1Transform(Context->State, Context->Buffer);
         BufferContentSize = 0;
      }
      memcpy(Context->Buffer + BufferContentSize, Buffer, BufferSize);
   }
}

Referenced by A_SHAFinal(), sha_check(), update_hash_impl(), and VerifyInteg().

SHA1Transform()

static void SHA1Transform ( ULONG  State[5], UCHAR  Buffer[64]  )

static

Definition at line 42 of file sha1.c.

{
   ULONG a, b, c, d, e;
   ULONG *Block;
 
   Block = (ULONG*)Buffer;
 
   /* Copy Context->State[] to working variables */
   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 variables 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;
}

Referenced by A_SHAUpdate().