sha_locl.h

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#include <stdlib.h>
#include <string.h>

#ifdef undef
/* one or the other needs to be defined */
#ifndef SHA_1 /* FIPE 180-1 */
#define SHA_0 /* FIPS 180   */
#endif
#endif

#define ULONG	unsigned long
#define UCHAR	unsigned char
#define UINT	unsigned int

#ifdef NOCONST
#define const
#endif

#undef c2nl
#define c2nl(c,l)	(l =(((unsigned long)(*((c)++)))<<24), \
			 l|=(((unsigned long)(*((c)++)))<<16), \
			 l|=(((unsigned long)(*((c)++)))<< 8), \
			 l|=(((unsigned long)(*((c)++)))    ))

#undef p_c2nl
#define p_c2nl(c,l,n)	{ \
			switch (n) { \
			case 0: l =((unsigned long)(*((c)++)))<<24; \
			case 1: l|=((unsigned long)(*((c)++)))<<16; \
			case 2: l|=((unsigned long)(*((c)++)))<< 8; \
			case 3: l|=((unsigned long)(*((c)++))); \
				} \
			}

#undef c2nl_p
/* NOTE the pointer is not incremented at the end of this */
#define c2nl_p(c,l,n)	{ \
			l=0; \
			(c)+=n; \
			switch (n) { \
			case 3: l =((unsigned long)(*(--(c))))<< 8; \
			case 2: l|=((unsigned long)(*(--(c))))<<16; \
			case 1: l|=((unsigned long)(*(--(c))))<<24; \
				} \
			}

#undef p_c2nl_p
#define p_c2nl_p(c,l,sc,len) { \
			switch (sc) \
				{ \
			case 0: l =((unsigned long)(*((c)++)))<<24; \
				if (--len == 0) break; \
			case 1: l|=((unsigned long)(*((c)++)))<<16; \
				if (--len == 0) break; \
			case 2: l|=((unsigned long)(*((c)++)))<< 8; \
				} \
			}

#undef nl2c
#define nl2c(l,c)	(*((c)++)=(unsigned char)(((l)>>24)&0xff), \
			 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
			 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
			 *((c)++)=(unsigned char)(((l)    )&0xff))

#undef c2l
#define c2l(c,l)	(l =(((unsigned long)(*((c)++)))    ), \
			 l|=(((unsigned long)(*((c)++)))<< 8), \
			 l|=(((unsigned long)(*((c)++)))<<16), \
			 l|=(((unsigned long)(*((c)++)))<<24))

#undef p_c2l
#define p_c2l(c,l,n)	{ \
			switch (n) { \
			case 0: l =((unsigned long)(*((c)++))); \
			case 1: l|=((unsigned long)(*((c)++)))<< 8; \
			case 2: l|=((unsigned long)(*((c)++)))<<16; \
			case 3: l|=((unsigned long)(*((c)++)))<<24; \
				} \
			}

#undef c2l_p
/* NOTE the pointer is not incremented at the end of this */
#define c2l_p(c,l,n)	{ \
			l=0; \
			(c)+=n; \
			switch (n) { \
			case 3: l =((unsigned long)(*(--(c))))<<16; \
			case 2: l|=((unsigned long)(*(--(c))))<< 8; \
			case 1: l|=((unsigned long)(*(--(c)))); \
				} \
			}

#undef p_c2l_p
#define p_c2l_p(c,l,sc,len) { \
			switch (sc) \
				{ \
			case 0: l =((unsigned long)(*((c)++))); \
				if (--len == 0) break; \
			case 1: l|=((unsigned long)(*((c)++)))<< 8; \
				if (--len == 0) break; \
			case 2: l|=((unsigned long)(*((c)++)))<<16; \
				} \
			}

#undef l2c
#define l2c(l,c)	(*((c)++)=(unsigned char)(((l)    )&0xff), \
			 *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
			 *((c)++)=(unsigned char)(((l)>>16)&0xff), \
			 *((c)++)=(unsigned char)(((l)>>24)&0xff))

#undef ROTATE
#if defined(WIN32)
#define ROTATE(a,n)     _lrotl(a,n)
#else
#define ROTATE(a,n)     (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
#endif

/* A nice byte order reversal from Wei Dai <[e-mail]> */
#if defined(WIN32)
/* 5 instructions with rotate instruction, else 9 */
#define Endian_Reverse32(a) \
	{ \
	unsigned long l=(a); \
	(a)=((ROTATE(l,8)&0x00FF00FF)|(ROTATE(l,24)&0xFF00FF00)); \
	}
#else
/* 6 instructions with rotate instruction, else 8 */
#define Endian_Reverse32(a) \
	{ \
	unsigned long l=(a); \
	l=(((l&0xFF00FF00)>>8L)|((l&0x00FF00FF)<<8L)); \
	(a)=ROTATE(l,16L); \
	}
#endif

/* As  pointed out by Wei Dai <[e-mail]>, F() below can be
 * simplified to the code in F_00_19.  Wei attributes these optimisations
 * to Peter Gutmann's SHS code, and he attributes it to Rich Schroeppel.
 * #define F(x,y,z) (((x) & (y))  |  ((~(x)) & (z)))
 * I've just become aware of another tweak to be made, again from Wei Dai,
 * in F_40_59, (x&a)|(y&a) -> (x|y)&a
 */
#define	F_00_19(b,c,d)	((((c) ^ (d)) & (b)) ^ (d)) 
#define	F_20_39(b,c,d)	((b) ^ (c) ^ (d))
#define F_40_59(b,c,d)	(((b) & (c)) | (((b)|(c)) & (d))) 
#define	F_60_79(b,c,d)	F_20_39(b,c,d)

#ifdef SHA_0
#undef Xupdate
#define Xupdate(a,i,ia,ib,ic,id) X[(i)&0x0f]=(a)=\
	(ia[(i)&0x0f]^ib[((i)+2)&0x0f]^ic[((i)+8)&0x0f]^id[((i)+13)&0x0f]);
#endif
#ifdef SHA_1
#undef Xupdate
#define Xupdate(a,i,ia,ib,ic,id) (a)=\
	(ia[(i)&0x0f]^ib[((i)+2)&0x0f]^ic[((i)+8)&0x0f]^id[((i)+13)&0x0f]);\
	X[(i)&0x0f]=(a)=ROTATE((a),1);
#endif

#define BODY_00_15(i,a,b,c,d,e,f,xa) \
	(f)=xa[i]+(e)+K_00_19+ROTATE((a),5)+F_00_19((b),(c),(d)); \
	(b)=ROTATE((b),30);

#define BODY_16_19(i,a,b,c,d,e,f,xa,xb,xc,xd) \
	Xupdate(f,i,xa,xb,xc,xd); \
	(f)+=(e)+K_00_19+ROTATE((a),5)+F_00_19((b),(c),(d)); \
	(b)=ROTATE((b),30);

#define BODY_20_31(i,a,b,c,d,e,f,xa,xb,xc,xd) \
	Xupdate(f,i,xa,xb,xc,xd); \
	(f)+=(e)+K_20_39+ROTATE((a),5)+F_20_39((b),(c),(d)); \
	(b)=ROTATE((b),30);

#define BODY_32_39(i,a,b,c,d,e,f,xa) \
	Xupdate(f,i,xa,xa,xa,xa); \
	(f)+=(e)+K_20_39+ROTATE((a),5)+F_20_39((b),(c),(d)); \
	(b)=ROTATE((b),30);

#define BODY_40_59(i,a,b,c,d,e,f,xa) \
	Xupdate(f,i,xa,xa,xa,xa); \
	(f)+=(e)+K_40_59+ROTATE((a),5)+F_40_59((b),(c),(d)); \
	(b)=ROTATE((b),30);

#define BODY_60_79(i,a,b,c,d,e,f,xa) \
	Xupdate(f,i,xa,xa,xa,xa); \
	(f)=X[(i)&0x0f]+(e)+K_60_79+ROTATE((a),5)+F_60_79((b),(c),(d)); \
	(b)=ROTATE((b),30);