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39 results

base16-encode.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    base16-encode.c 1.51 KiB
    /* base16-encode.c
     *
     * Hex encoding.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2002 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 "base16.h"
    
    
    static const uint8_t
    hex_digits[16] = "0123456789abcdef";
    
    #define DIGIT(x) (hex_digits[(x) & 0xf])
    
    /* Encodes a single byte. Always stores two digits in dst[0] and dst[1]. */
    void
    base16_encode_single(uint8_t *dst,
    		     uint8_t src)
    {
      dst[0] = DIGIT(src/0x10);
      dst[1] = DIGIT(src);
    }
    
    /* Always stores BASE16_ENCODE_LENGTH(length) digits in dst. */
    void
    base16_encode_update(uint8_t *dst,
    		     unsigned length,
    		     const uint8_t *src)
    {
      unsigned i;
      
      for (i = 0, dst; i<length; i++, dst += 2)
        base16_encode_single(dst, src[i]);
    }