crypto/ctype.c

   1 /*
   2  * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include "internal/ctype.h"
  12 #include "openssl/ebcdic.h"
  13
  14 /*
  15  * Define the character classes for each character in the seven bit ASCII
  16  * character set.  This is independent of the host's character set, characters
  17  * are converted to ASCII before being used as an index in to this table.
  18  * Characters outside of the seven bit ASCII range are detected before indexing.
  19  */
  20 static const unsigned short ctype_char_map[128] = {
  21    /* 00 nul */ CTYPE_MASK_cntrl,
  22    /* 01 soh */ CTYPE_MASK_cntrl,
  23    /* 02 stx */ CTYPE_MASK_cntrl,
  24    /* 03 etx */ CTYPE_MASK_cntrl,
  25    /* 04 eot */ CTYPE_MASK_cntrl,
  26    /* 05 enq */ CTYPE_MASK_cntrl,
  27    /* 06 ack */ CTYPE_MASK_cntrl,
  28    /* 07 \a  */ CTYPE_MASK_cntrl,
  29    /* 08 \b  */ CTYPE_MASK_cntrl,
  30    /* 09 \t  */ CTYPE_MASK_blank | CTYPE_MASK_cntrl | CTYPE_MASK_space,
  31    /* 0A \n  */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
  32    /* 0B \v  */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
  33    /* 0C \f  */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
  34    /* 0D \r  */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
  35    /* 0E so  */ CTYPE_MASK_cntrl,
  36    /* 0F si  */ CTYPE_MASK_cntrl,
  37    /* 10 dle */ CTYPE_MASK_cntrl,
  38    /* 11 dc1 */ CTYPE_MASK_cntrl,
  39    /* 12 dc2 */ CTYPE_MASK_cntrl,
  40    /* 13 dc3 */ CTYPE_MASK_cntrl,
  41    /* 14 dc4 */ CTYPE_MASK_cntrl,
  42    /* 15 nak */ CTYPE_MASK_cntrl,
  43    /* 16 syn */ CTYPE_MASK_cntrl,
  44    /* 17 etb */ CTYPE_MASK_cntrl,
  45    /* 18 can */ CTYPE_MASK_cntrl,
  46    /* 19 em  */ CTYPE_MASK_cntrl,
  47    /* 1A sub */ CTYPE_MASK_cntrl,
  48    /* 1B esc */ CTYPE_MASK_cntrl,
  49    /* 1C fs  */ CTYPE_MASK_cntrl,
  50    /* 1D gs  */ CTYPE_MASK_cntrl,
  51    /* 1E rs  */ CTYPE_MASK_cntrl,
  52    /* 1F us  */ CTYPE_MASK_cntrl,
  53    /* 20     */ CTYPE_MASK_blank | CTYPE_MASK_print | CTYPE_MASK_space
  54                 | CTYPE_MASK_asn1print,
  55    /* 21  !  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  56    /* 22  "  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  57    /* 23  #  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  58    /* 24  $  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  59    /* 25  %  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  60    /* 26  &  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  61    /* 27  '  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  62                 | CTYPE_MASK_asn1print,
  63    /* 28  (  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  64                 | CTYPE_MASK_asn1print,
  65    /* 29  )  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  66                 | CTYPE_MASK_asn1print,
  67    /* 2A  *  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
  68    /* 2B  +  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  69                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  70    /* 2C  ,  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  71                 | CTYPE_MASK_asn1print,
  72    /* 2D  -  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  73                 | CTYPE_MASK_asn1print,
  74    /* 2E  .  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  75                 | CTYPE_MASK_asn1print,
  76    /* 2F  /  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  77                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  78    /* 30  0  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  79                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  80    /* 31  1  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  81                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  82    /* 32  2  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  83                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  84    /* 33  3  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  85                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  86    /* 34  4  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  87                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  88    /* 35  5  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  89                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  90    /* 36  6  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  91                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  92    /* 37  7  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  93                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  94    /* 38  8  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  95                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  96    /* 39  9  */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
  97                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
  98    /* 3A  :  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
  99                 | CTYPE_MASK_asn1print,
 100    /* 3B  ;  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 101    /* 3C  <  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 102    /* 3D  =  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
 103                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 104    /* 3E  >  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 105    /* 3F  ?  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
 106                 | CTYPE_MASK_asn1print,
 107    /* 40  @  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 108    /* 41  A  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 109                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 110    /* 42  B  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 111                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 112    /* 43  C  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 113                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 114    /* 44  D  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 115                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 116    /* 45  E  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 117                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 118    /* 46  F  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 119                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 120    /* 47  G  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 121                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 122    /* 48  H  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 123                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 124    /* 49  I  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 125                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 126    /* 4A  J  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 127                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 128    /* 4B  K  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 129                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 130    /* 4C  L  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 131                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 132    /* 4D  M  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 133                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 134    /* 4E  N  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 135                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 136    /* 4F  O  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 137                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 138    /* 50  P  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 139                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 140    /* 51  Q  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 141                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 142    /* 52  R  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 143                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 144    /* 53  S  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 145                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 146    /* 54  T  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 147                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 148    /* 55  U  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 149                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 150    /* 56  V  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 151                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 152    /* 57  W  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 153                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 154    /* 58  X  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 155                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 156    /* 59  Y  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 157                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 158    /* 5A  Z  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
 159                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 160    /* 5B  [  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 161    /* 5C  \  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 162    /* 5D  ]  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 163    /* 5E  ^  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 164    /* 5F  _  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 165    /* 60  `  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 166    /* 61  a  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 167                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 168    /* 62  b  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 169                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 170    /* 63  c  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 171                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 172    /* 64  d  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 173                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 174    /* 65  e  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 175                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 176    /* 66  f  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 177                 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 178    /* 67  g  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 179                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 180    /* 68  h  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 181                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 182    /* 69  i  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 183                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 184    /* 6A  j  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 185                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 186    /* 6B  k  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 187                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 188    /* 6C  l  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 189                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 190    /* 6D  m  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 191                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 192    /* 6E  n  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 193                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 194    /* 6F  o  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 195                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 196    /* 70  p  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 197                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 198    /* 71  q  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 199                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 200    /* 72  r  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 201                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 202    /* 73  s  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 203                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 204    /* 74  t  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 205                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 206    /* 75  u  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 207                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 208    /* 76  v  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 209                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 210    /* 77  w  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 211                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 212    /* 78  x  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 213                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 214    /* 79  y  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 215                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 216    /* 7A  z  */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
 217                 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
 218    /* 7B  {  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 219    /* 7C  |  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 220    /* 7D  }  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 221    /* 7E  ~  */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
 222    /* 7F del */ CTYPE_MASK_cntrl
 223 };
 224
 225 #ifdef CHARSET_EBCDIC
 226 int ossl_toascii(int c)
 227 {
 228     if (c < -128 || c > 256)
 229         return c;
 230     /*
 231      * Adjust negatively signed characters.
 232      * This is not required for ASCII because any character that sign extends
 233      * is not seven bit and all of the checks are on the seven bit characters.
 234      * I.e. any check must fail on sign extension.
 235      */
 236     if (c < 0)
 237         c += 256;
 238     return os_toascii[c];
 239 }
 240
 241 int ossl_fromascii(int c)
 242 {
 243     if (c < -128 || c > 256)
 244         return c;
 245     if (c < 0)
 246         c += 256;
 247     return os_toebcdic[c];
 248 }
 249 #endif
 250
 251 int ossl_ctype_check(int c, unsigned int mask)
 252 {
 253     const int max = sizeof(ctype_char_map) / sizeof(*ctype_char_map);
 254     const int a = ossl_toascii(c);
 255
 256     return a >= 0 && a < max && (ctype_char_map[a] & mask) != 0;
 257 }
 258
 259 #if defined(CHARSET_EBCDIC) && !defined(CHARSET_EBCDIC_TEST)
 260 static const int case_change = 0x40;
 261 #else
 262 static const int case_change = 0x20;
 263 #endif
 264
 265 int ossl_tolower(int c)
 266 {
 267     return ossl_isupper(c) ? c ^ case_change : c;
 268 }
 269
 270 int ossl_toupper(int c)
 271 {
 272     return ossl_islower(c) ? c ^ case_change : c;
 273 }