/* ====================================================================
 * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ==================================================================== */

#ifndef OPENSSL_HEADER_MD32_COMMON_H
#define OPENSSL_HEADER_MD32_COMMON_H

#include <openssl/base.h>


#if defined(__cplusplus)
extern "C" {
#endif

#define asm __asm__

/* This is a generic 32 bit "collector" for message digest algorithms.
 * Whenever needed it collects input character stream into chunks of
 * 32 bit values and invokes a block function that performs actual hash
 * calculations.
 *
 * Porting guide.
 *
 * Obligatory macros:
 *
 * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN
 *	this macro defines byte order of input stream.
 * HASH_CBLOCK
 *	size of a unit chunk HASH_BLOCK operates on.
 * HASH_LONG
 *	has to be at lest 32 bit wide, if it's wider, then
 *	HASH_LONG_LOG2 *has to* be defined along
 * HASH_CTX
 *	context structure that at least contains following
 *	members:
 *		typedef struct {
 *			...
 *			HASH_LONG	Nl,Nh;
 *			either {
 *			HASH_LONG	data[HASH_LBLOCK];
 *			unsigned char	data[HASH_CBLOCK];
 *			};
 *			unsigned int	num;
 *			...
 *			} HASH_CTX;
 *	data[] vector is expected to be zeroed upon first call to
 *	HASH_UPDATE.
 * HASH_UPDATE
 *	name of "Update" function, implemented here.
 * HASH_TRANSFORM
 *	name of "Transform" function, implemented here.
 * HASH_FINAL
 *	name of "Final" function, implemented here.
 * HASH_BLOCK_DATA_ORDER
 *	name of "block" function capable of treating *unaligned* input
 *	message in original (data) byte order, implemented externally.
 * HASH_MAKE_STRING
 *	macro convering context variables to an ASCII hash string.
 *
 * MD5 example:
 *
 *	#define DATA_ORDER_IS_LITTLE_ENDIAN
 *
 *	#define HASH_LONG		MD5_LONG
 *	#define HASH_LONG_LOG2		MD5_LONG_LOG2
 *	#define HASH_CTX		MD5_CTX
 *	#define HASH_CBLOCK		MD5_CBLOCK
 *	#define HASH_UPDATE		MD5_Update
 *	#define HASH_TRANSFORM		MD5_Transform
 *	#define HASH_FINAL		MD5_Final
 *	#define HASH_BLOCK_DATA_ORDER	md5_block_data_order
 *
 *					<appro@fy.chalmers.se>
 */

#if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
#error "DATA_ORDER must be defined!"
#endif

#ifndef HASH_CBLOCK
#error "HASH_CBLOCK must be defined!"
#endif
#ifndef HASH_LONG
#error "HASH_LONG must be defined!"
#endif
#ifndef HASH_CTX
#error "HASH_CTX must be defined!"
#endif

#ifndef HASH_UPDATE
#error "HASH_UPDATE must be defined!"
#endif
#ifndef HASH_TRANSFORM
#error "HASH_TRANSFORM must be defined!"
#endif
#ifndef HASH_FINAL
#error "HASH_FINAL must be defined!"
#endif

#ifndef HASH_BLOCK_DATA_ORDER
#error "HASH_BLOCK_DATA_ORDER must be defined!"
#endif

/*
 * Engage compiler specific rotate intrinsic function if available.
 */
#undef ROTATE
# if defined(_MSC_VER)
#  define ROTATE(a,n)	_lrotl(a,n)
# elif defined(__ICC)
#  define ROTATE(a,n)	_rotl(a,n)
# elif defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM)
  /*
   * Some GNU C inline assembler templates. Note that these are
   * rotates by *constant* number of bits! But that's exactly
   * what we need here...
   * 					<appro@fy.chalmers.se>
   */
#  if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
#   define ROTATE(a,n)	({ register unsigned int ret;	\
				asm (			\
				"roll %1,%0"		\
				: "=r"(ret)		\
				: "I"(n), "0"((unsigned int)(a))	\
				: "cc");		\
			   ret;				\
			})
#  endif /* OPENSSL_X86 || OPENSSL_X86_64 */
# endif /* COMPILER */

#ifndef ROTATE
#define ROTATE(a,n)     (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
#endif

#if defined(DATA_ORDER_IS_BIG_ENDIAN)

#ifndef PEDANTIC
# if defined(__GNUC__) && __GNUC__>=2 && !defined(OPENSSL_NO_ASM)
# if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
    /*
     * This gives ~30-40% performance improvement in SHA-256 compiled
     * with gcc [on P4]. Well, first macro to be frank. We can pull
     * this trick on x86* platforms only, because these CPUs can fetch
     * unaligned data without raising an exception.
     */
#   define HOST_c2l(c,l)	({ unsigned int r=*((const unsigned int *)(c));	\
				   asm ("bswapl %0":"=r"(r):"0"(r));	\
				   (c)+=4; (l)=r;			})
#   define HOST_l2c(l,c)	({ unsigned int r=(l);			\
				   asm ("bswapl %0":"=r"(r):"0"(r));	\
				   *((unsigned int *)(c))=r; (c)+=4; r;	})
#  elif defined(__aarch64__)
#   if defined(__BYTE_ORDER__)
#    if defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__==__ORDER_LITTLE_ENDIAN__
#     define HOST_c2l(c,l)	({ unsigned int r;		\
				   asm ("rev	%w0,%w1"	\
					:"=r"(r)		\
					:"r"(*((const unsigned int *)(c))));\
				   (c)+=4; (l)=r;		})
#     define HOST_l2c(l,c)	({ unsigned int r;		\
				   asm ("rev	%w0,%w1"	\
					:"=r"(r)		\
					:"r"((unsigned int)(l)));\
				   *((unsigned int *)(c))=r; (c)+=4; r;	})
#    elif defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__==__ORDER_BIG_ENDIAN__
#     define HOST_c2l(c,l)	(void)((l)=*((const unsigned int *)(c)), (c)+=4)
#     define HOST_l2c(l,c)	(*((unsigned int *)(c))=(l), (c)+=4, (l))
#    endif
#   endif
#  endif
# endif
#endif

#ifndef HOST_c2l
#define HOST_c2l(c,l)	(void)(l =(((unsigned long)(*((c)++)))<<24),	\
			 l|=(((unsigned long)(*((c)++)))<<16),		\
			 l|=(((unsigned long)(*((c)++)))<< 8),		\
			 l|=(((unsigned long)(*((c)++)))    ))
#endif
#ifndef HOST_l2c
#define HOST_l2c(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),	\
			 l)
#endif

#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)

#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
   /* See comment in DATA_ORDER_IS_BIG_ENDIAN section. */
#  define HOST_c2l(c,l)	(void)((l)=*((const unsigned int *)(c)), (c)+=4)
#  define HOST_l2c(l,c)	(*((unsigned int *)(c))=(l), (c)+=4, l)
#endif

#ifndef HOST_c2l
#define HOST_c2l(c,l)	(void)(l =(((unsigned long)(*((c)++)))    ),	\
			 l|=(((unsigned long)(*((c)++)))<< 8),		\
			 l|=(((unsigned long)(*((c)++)))<<16),		\
			 l|=(((unsigned long)(*((c)++)))<<24))
#endif
#ifndef HOST_l2c
#define HOST_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),	\
			 l)
#endif

#endif

int HASH_UPDATE (HASH_CTX *c, const void *data_, size_t len)
	{
	const unsigned char *data=data_;
	unsigned char *p;
	HASH_LONG l;
	size_t n;

	if (len==0) return 1;

	l=(c->Nl+(((HASH_LONG)len)<<3))&0xffffffffUL;
	/* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
	 * Wei Dai <weidai@eskimo.com> for pointing it out. */
	if (l < c->Nl) /* overflow */
		c->Nh++;
	c->Nh+=(HASH_LONG)(len>>29);	/* might cause compiler warning on 16-bit */
	c->Nl=l;

	n = c->num;
	if (n != 0)
		{
		p=(unsigned char *)c->data;

		if (len >= HASH_CBLOCK || len+n >= HASH_CBLOCK)
			{
			memcpy (p+n,data,HASH_CBLOCK-n);
			HASH_BLOCK_DATA_ORDER (c,p,1);
			n      = HASH_CBLOCK-n;
			data  += n;
			len   -= n;
			c->num = 0;
			memset (p,0,HASH_CBLOCK);	/* keep it zeroed */
			}
		else
			{
			memcpy (p+n,data,len);
			c->num += (unsigned int)len;
			return 1;
			}
		}

	n = len/HASH_CBLOCK;
	if (n > 0)
		{
		HASH_BLOCK_DATA_ORDER (c,data,n);
		n    *= HASH_CBLOCK;
		data += n;
		len  -= n;
		}

	if (len != 0)
		{
		p = (unsigned char *)c->data;
		c->num = (unsigned int)len;
		memcpy (p,data,len);
		}
	return 1;
	}


void HASH_TRANSFORM (HASH_CTX *c, const unsigned char *data)
	{
	HASH_BLOCK_DATA_ORDER (c,data,1);
	}


int HASH_FINAL (unsigned char *md, HASH_CTX *c)
	{
	unsigned char *p = (unsigned char *)c->data;
	size_t n = c->num;

	p[n] = 0x80; /* there is always room for one */
	n++;

	if (n > (HASH_CBLOCK-8))
		{
		memset (p+n,0,HASH_CBLOCK-n);
		n=0;
		HASH_BLOCK_DATA_ORDER (c,p,1);
		}
	memset (p+n,0,HASH_CBLOCK-8-n);

	p += HASH_CBLOCK-8;
#if   defined(DATA_ORDER_IS_BIG_ENDIAN)
	(void)HOST_l2c(c->Nh,p);
	(void)HOST_l2c(c->Nl,p);
#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
	(void)HOST_l2c(c->Nl,p);
	(void)HOST_l2c(c->Nh,p);
#endif
	p -= HASH_CBLOCK;
	HASH_BLOCK_DATA_ORDER (c,p,1);
	c->num=0;
	memset (p,0,HASH_CBLOCK);

#ifndef HASH_MAKE_STRING
#error "HASH_MAKE_STRING must be defined!"
#else
	HASH_MAKE_STRING(c,md);
#endif

	return 1;
	}

#ifndef MD32_REG_T
#define MD32_REG_T int
#endif


#if defined(__cplusplus)
}  /* extern C */
#endif

#endif  /* OPENSSL_HEADER_MD32_COMMON_H */
