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41 results

sha512-224-meta.c

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  • base64-decode.c 3.81 KiB
    /* base64-encode.c
     *
     */
    
    /* 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 "base64.h"
    
    #define TABLE_INVALID -1
    #define TABLE_SPACE -2
    #define TABLE_END -3
    
    /* FIXME: Make sure that all whitespace characters, SPC, HT, VT, FF,
     * CR and LF are ignored. */
    static const signed char
    decode_table[0x100] =
    {
      -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, 62, -1, -1, -1, 63,
      52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -3, -1, -1,
      -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
      15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
      -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
      41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -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, -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, -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, -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, -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, -1, -1, -1,
    };
    
    void
    base64_decode_init(struct base64_decode_ctx *ctx)
    {
      ctx->word = ctx->bits = ctx->padding = 0;
    }
    
    int
    base64_decode_single(struct base64_decode_ctx *ctx,
    		     uint8_t *dst,
    		     uint8_t src)
    {
      int data;
      
      data = decode_table[src];
    
      switch(data)
        {
        default:
          assert(data >= 0 && data < 0x40);
    
          if (ctx->padding)
    	return -1;
          
          ctx->word = ctx->word << 6 | data;
          ctx->bits += 6;
    
          if (ctx->bits >= 8)
    	{
    	  ctx->bits -= 8;
    	  dst[0] = ctx->word >> ctx->bits;
    	  return 1;
    	}
          else return 0;
    
        case TABLE_INVALID:
          return -1;
    
        case TABLE_SPACE:
          return 0;
          
        case TABLE_END:
          /* There can be at most two padding characters. */
          if (!ctx->bits || ctx->padding > 2)
    	return -1;
          
          if (ctx->word & ( (1<<ctx->bits) - 1))
    	/* We shouldn't have any leftover bits */
    	return -1;
    
          ctx->padding++;
          ctx->bits -= 2;
          return 0;
        }
    }
    
    int
    base64_decode_update(struct base64_decode_ctx *ctx,
    		     unsigned *dst_length,
    		     uint8_t *dst,
    		     unsigned src_length,
    		     const uint8_t *src)
    {
      unsigned done;
      unsigned i;
    
      assert(*dst_length >= BASE64_DECODE_LENGTH(src_length));
      
      for (i = 0, done = 0; i<src_length; i++)
        switch(base64_decode_single(ctx, dst + done, src[i]))
          {
          case -1:
    	return 0;
          case 1:
    	done++;
    	/* Fall through */
          case 0:
    	break;
          default:
    	abort();
          }
      
      assert(done <= BASE64_DECODE_LENGTH(src_length));
    
      *dst_length = done;
      return 1;
    }
    
    int
    base64_decode_final(struct base64_decode_ctx *ctx)
    {
      return ctx->bits == 0;
    }