text: /*
    +----------------------------------------------------------------------+
    | PHP Version 5                                                        |
    +----------------------------------------------------------------------+
    | Copyright (c) 1997-2012 The PHP Group                                |
    +----------------------------------------------------------------------+
    | This source file is subject to version 3.01 of the PHP license,      |
    | that is bundled with this package in the file LICENSE, and is        |
    | available through the world-wide-web at the following url:           |
    | http://www.php.net/license/3_01.txt                                  |
    | If you did not receive a copy of the PHP license and are unable to   |
    | obtain it through the world-wide-web, please send a note to          |
    | license@php.net so we can mail you a copy immediately.               |
    +----------------------------------------------------------------------+
    | Authors: Michael Wallner <mike@php.net>                              |
    |          Sara Golemon <pollita@php.net>                              |
    +----------------------------------------------------------------------+
  */
  
  /* $Id$ */
  
  #include "php_hash.h"
  #include "php_hash_snefru.h"
  #include "php_hash_snefru_tables.h"
  
  #define round(L, C, N, SB)	\
  	SBE = SB[C & 0xff]; \
  	L ^= SBE; \
  	N ^= SBE
  
  #ifndef DBG_SNEFRU
  #define DBG_SNEFRU 0
  #endif
  
  #if DBG_SNEFRU
  void ph(php_hash_uint32 h[16])
  {
  	int i;
  	for (i = 0; i < 16; i++)
  		printf ("%08lx", h[i]); printf("\n");
  }
  #endif
  
  static inline void Snefru(php_hash_uint32 input[16])
  {
  	static int shifts[4] = {16, 8, 16, 24};
  	int b, index, rshift, lshift;
  	const php_hash_uint32 *t0,*t1;
  	php_hash_uint32 SBE,B00,B01,B02,B03,B04,B05,B06,B07,B08,B09,B10,B11,B12,B13,B14,B15;
  
  	B00 = input[0];
  	B01 = input[1];
  	B02 = input[2];
  	B03 = input[3];
  	B04 = input[4];
  	B05 = input[5];
  	B06 = input[6];
  	B07 = input[7];
  	B08 = input[8];
  	B09 = input[9];
  	B10 = input[10];
  	B11 = input[11];
  	B12 = input[12];
  	B13 = input[13];
  	B14 = input[14];
  	B15 = input[15];
  
  	for (index = 0; index < 8; index++) {
  		t0 = tables[2*index+0];
  		t1 = tables[2*index+1];
  		for (b = 0; b < 4; b++) {
  			round(B15, B00, B01, t0);
  			round(B00, B01, B02, t0);
  			round(B01, B02, B03, t1);
  			round(B02, B03, B04, t1);
  			round(B03, B04, B05, t0);
  			round(B04, B05, B06, t0);
  			round(B05, B06, B07, t1);
  			round(B06, B07, B08, t1);
  			round(B07, B08, B09, t0);
  			round(B08, B09, B10, t0);
  			round(B09, B10, B11, t1);
  			round(B10, B11, B12, t1);
  			round(B11, B12, B13, t0);
  			round(B12, B13, B14, t0);
  			round(B13, B14, B15, t1);
  			round(B14, B15, B00, t1);
  			
  			rshift = shifts[b]; 
  			lshift = 32-rshift;
  			
  			B00 = (B00 >> rshift) | (B00 << lshift);
  			B01 = (B01 >> rshift) | (B01 << lshift);
  			B02 = (B02 >> rshift) | (B02 << lshift);
  			B03 = (B03 >> rshift) | (B03 << lshift);
  			B04 = (B04 >> rshift) | (B04 << lshift);
  			B05 = (B05 >> rshift) | (B05 << lshift);
  			B06 = (B06 >> rshift) | (B06 << lshift);
  			B07 = (B07 >> rshift) | (B07 << lshift);
  			B08 = (B08 >> rshift) | (B08 << lshift);
  			B09 = (B09 >> rshift) | (B09 << lshift);
  			B10 = (B10 >> rshift) | (B10 << lshift);
  			B11 = (B11 >> rshift) | (B11 << lshift);
  			B12 = (B12 >> rshift) | (B12 << lshift);
  			B13 = (B13 >> rshift) | (B13 << lshift);
  			B14 = (B14 >> rshift) | (B14 << lshift);
  			B15 = (B15 >> rshift) | (B15 << lshift);
  		}
  	}
  	input[0] ^= B15;
  	input[1] ^= B14;
  	input[2] ^= B13;
  	input[3] ^= B12;
  	input[4] ^= B11;
  	input[5] ^= B10;
  	input[6] ^= B09;
  	input[7] ^= B08;
  #if DBG_SNEFRU
  	ph(input);
  #endif
  }
  
  static inline void SnefruTransform(PHP_SNEFRU_CTX *context, const unsigned char input[32])
  {
  	int i, j;
  
  	for (i = 0, j = 0; i < 32; i += 4, ++j) {
  		context->state[8+j] =	((input[i] & 0xff) << 24) | ((input[i+1] & 0xff) << 16) |
  								((input[i+2] & 0xff) << 8) | (input[i+3] & 0xff);
  	}
  	Snefru(context->state);
  	memset(&context->state[8], 0, sizeof(php_hash_uint32) * 8);
  }
  
  PHP_HASH_API void PHP_SNEFRUInit(PHP_SNEFRU_CTX *context)
  {
  	memset(context, 0, sizeof(*context));
  }
  
  static const php_hash_uint32 MAX32 = 0xffffffffLU;
  
  PHP_HASH_API void PHP_SNEFRUUpdate(PHP_SNEFRU_CTX *context, const unsigned char *input, size_t len)
  {
  	if ((MAX32 - context->count[1]) < (len * 8)) {
  		context->count[0]++;
  		context->count[1] = MAX32 - context->count[1];
  		context->count[1] = (len * 8) - context->count[1];
  	} else {
  		context->count[1] += len * 8;
  	}
  	
  	if (context->length + len < 32) {
  		memcpy(&context->buffer[context->length], input, len);
  		context->length += len;
  	} else {
  		size_t i = 0, r = (context->length + len) % 32;
  		
  		if (context->length) {
  			i = 32 - context->length;
  			memcpy(&context->buffer[context->length], input, i);
  			SnefruTransform(context, context->buffer);
  		}
  		
  		for (; i + 32 <= len; i += 32) {
  			SnefruTransform(context, input + i);
  		}
  		
  		memcpy(context->buffer, input + i, r);
  		memset(&context->buffer[r], 0, 32 - r);
  		context->length = r;
  	}
  }
  
  PHP_HASH_API void PHP_SNEFRUFinal(unsigned char digest[32], PHP_SNEFRU_CTX *context)
  {
  	php_hash_uint32 i, j;
  	
  	if (context->length) {
  		SnefruTransform(context, context->buffer);
  	}
  	
  	context->state[14] = context->count[0];
  	context->state[15] = context->count[1];
  	Snefru(context->state);
  	
  	for (i = 0, j = 0; j < 32; i++, j += 4) {
  		digest[j] = (unsigned char) ((context->state[i] >> 24) & 0xff);
  		digest[j + 1] = (unsigned char) ((context->state[i] >> 16) & 0xff);
  		digest[j + 2] = (unsigned char) ((context->state[i] >> 8) & 0xff);
  		digest[j + 3] = (unsigned char) (context->state[i] & 0xff);
  	}
  	
  	memset(context, 0, sizeof(*context));
  }
  
  const php_hash_ops php_hash_snefru_ops = {
  	(php_hash_init_func_t) PHP_SNEFRUInit,
  	(php_hash_update_func_t) PHP_SNEFRUUpdate,
  	(php_hash_final_func_t) PHP_SNEFRUFinal,
  	(php_hash_copy_func_t) php_hash_copy,
  	32,
  	32,
  	sizeof(PHP_SNEFRU_CTX)
  };
  
  /*
   * Local variables:
   * tab-width: 4
   * c-basic-offset: 4
   * End:
   * vim600: sw=4 ts=4 fdm=marker
   * vim<600: sw=4 ts=4
   */
  