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rsa-encrypt-test

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    write-be32.c 1.57 KiB
    /* write-be32.c */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 Niels Möller
     *  
     * The nettle library is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or (at your
     * option) any later version.
     *
     * The nettle library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     * License for more details.
     * 
     * You should have received a copy of the GNU Lesser General Public License
     * along with the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, USA.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <stdlib.h>
    
    #include "nettle-write.h"
    
    #include "macros.h"
    
    void
    _nettle_write_be32(unsigned length, uint8_t *dst,
    		   uint32_t *src)
    {
      unsigned i;
      unsigned words;
      unsigned leftover;
      
      words = length / 4;
      leftover = length % 4;
    
      for (i = 0; i < words; i++, dst += 4)
        WRITE_UINT32(dst, src[i]);
    
      if (leftover)
        {
          uint32_t word;
          unsigned j = leftover;
          
          word = src[i];
          
          switch (leftover)
    	{
    	default:
    	  abort();
    	case 3:
    	  dst[--j] = (word >> 8) & 0xff;
    	  /* Fall through */
    	case 2:
    	  dst[--j] = (word >> 16) & 0xff;
    	  /* Fall through */
    	case 1:
    	  dst[--j] = (word >> 24) & 0xff;
    	}
        }
    }