3 * This file is part of the ARM-Crypto-Lib.
4 * Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 * base64 encoder (RFC3548)
30 #include "base64_enc.h"
32 const char base64_alphabet[64] = {
33 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
34 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
35 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
36 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
37 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
38 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
39 'w', 'x', 'y', 'z', '0', '1', '2', '3',
40 '4', '5', '6', '7', '8', '9', '+', '/' };
44 char bit6toAscii(uint8_t a){
46 return base64_alphabet[a];
49 void base64enc(char* dest,const void* src, uint16_t length){
52 for(i=0; i<length/3; ++i){
53 a[0]= (((uint8_t*)src)[i*3+0])>>2;
54 a[1]= (((((uint8_t*)src)[i*3+0])<<4) | ((((uint8_t*)src)[i*3+1])>>4)) & 0x3F;
55 a[2]= (((((uint8_t*)src)[i*3+1])<<2) | ((((uint8_t*)src)[i*3+2])>>6)) & 0x3F;
56 a[3]= (((uint8_t*)src)[i*3+2]) & 0x3F;
58 *dest++=bit6toAscii(a[j]);
61 /* now we do the rest */
66 a[0]=(((uint8_t*)src)[i*3+0])>>2;
67 a[1]=((((uint8_t*)src)[i*3+0])<<4)&0x3F;
68 *dest++ = bit6toAscii(a[0]);
69 *dest++ = bit6toAscii(a[1]);
74 a[0]= (((uint8_t*)src)[i*3+0])>>2;
75 a[1]= (((((uint8_t*)src)[i*3+0])<<4) | ((((uint8_t*)src)[i*3+1])>>4)) & 0x3F;
76 a[2]= ((((uint8_t*)src)[i*3+1])<<2) & 0x3F;
77 *dest++ = bit6toAscii(a[0]);
78 *dest++ = bit6toAscii(a[1]);
79 *dest++ = bit6toAscii(a[2]);
82 default: /* this will not happen! */