1/* 2 * Copyright (c) 2011-12 Apple Inc. All Rights Reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23/* 24 * Copyright (c) 2004-2005 Kungliga Tekniska Högskolan 25 * (Royal Institute of Technology, Stockholm, Sweden). 26 * All rights reserved. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 32 * 1. Redistributions of source code must retain the above copyright 33 * notice, this list of conditions and the following disclaimer. 34 * 35 * 2. Redistributions in binary form must reproduce the above copyright 36 * notice, this list of conditions and the following disclaimer in the 37 * documentation and/or other materials provided with the distribution. 38 * 39 * 3. Neither the name of the Institute nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 57#include "ossl-config.h" 58 59/* #include "rk-roken.h" */ 60 61#include <ctype.h> 62#include <stdlib.h> 63#include <string.h> 64 65#include "hex.h" 66 67static const char hexchar[16] = "0123456789ABCDEF"; 68 69static int 70pos(char c) 71{ 72 const char *p; 73 c = toupper((unsigned char)c); 74 for (p = hexchar; *p; p++) 75 if (*p == c) 76 return p - hexchar; 77 return -1; 78} 79 80ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 81hex_encode(const void *data, size_t size, char **str) 82{ 83 const unsigned char *q = data; 84 size_t i; 85 char *p; 86 87 /* check for overflow */ 88 if (size * 2 < size) { 89 *str = NULL; 90 return -1; 91 } 92 93 p = malloc(size * 2 + 1); 94 if (p == NULL) { 95 *str = NULL; 96 return -1; 97 } 98 99 for (i = 0; i < size; i++) { 100 p[i * 2] = hexchar[(*q >> 4) & 0xf]; 101 p[i * 2 + 1] = hexchar[*q & 0xf]; 102 q++; 103 } 104 p[i * 2] = '\0'; 105 *str = p; 106 107 return i * 2; 108} 109 110ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 111hex_decode(const char *str, void *data, size_t len) 112{ 113 size_t l; 114 unsigned char *p = data; 115 size_t i; 116 117 l = strlen(str); 118 119 /* check for overflow, same as (l+1)/2 but overflow safe */ 120 if ((l/2) + (l&1) > len) 121 return -1; 122 123 if (l & 1) { 124 p[0] = pos(str[0]); 125 str++; 126 p++; 127 } 128 for (i = 0; i < l / 2; i++) 129 p[i] = pos(str[i * 2]) << 4 | pos(str[(i * 2) + 1]); 130 return i + (l & 1); 131} 132