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41 results

rsa-blind.c

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  • base16-decode.c 2.95 KiB
    /* base16-encode.c
     *
     * Hex decoding.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 Niels Mller
     *  
     * 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 <assert.h>
    #include <stdlib.h>
    
    #include "base16.h"
    
    void
    base16_decode_init(struct base16_decode_ctx *ctx)
    {
      ctx->word = ctx->bits = 0;
    }
    
    enum { HEX_INVALID = -1, HEX_SPACE=-2 };
    
    static const signed char
    hex_decode_table[0x80] =
      {
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1, 
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
         0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1,
        -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      };
    
    /* Decodes a single byte. Returns amount of output (0 or 1), or -1 on
     * errors. */
    int
    base16_decode_single(struct base16_decode_ctx *ctx,
    		     uint8_t *dst,
    		     uint8_t src)
    {
      int digit;
    
      if (src >= 0x80)
        return -1;
    
      digit = hex_decode_table[src];
      switch (digit)
        {
        case -1:
          return -1;
        case -2:
          return 0;
        default:
          assert(digit >= 0);
          assert(digit < 0x10);
    
          if (ctx->bits)
    	{
    	  *dst = (ctx->word << 4) | digit;
    	  ctx->bits = 0;
    	  return 1;
    	}
          else
    	{
    	  ctx->word = digit;
    	  ctx->bits = 4;
    	  return 0;
    	}
        }
    }
    
    int
    base16_decode_update(struct base16_decode_ctx *ctx,
    		     unsigned *dst_length,
    		     uint8_t *dst,
    		     unsigned src_length,
    		     const uint8_t *src)
    {
      unsigned done;
      unsigned i;
    
      assert(*dst_length >= BASE16_DECODE_LENGTH(src_length));
      
      for (i = 0, done = 0; i<src_length; i++)
        switch(base16_decode_single(ctx, dst + done, src[i]))
          {
          case -1:
    	return 0;
          case 1:
    	done++;
    	/* Fall through */
          case 0:
    	break;
          default:
    	abort();
          }
      
      assert(done <= BASE16_DECODE_LENGTH(src_length));
    
      *dst_length = done;
      return 1;
    }
    
    int
    base16_decode_final(struct base16_decode_ctx *ctx)
    {
      return ctx->bits == 0;
    }