src/cipher.c

   1 /*
   2     Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
   3     Ben Kibbey <bjk@luxsci.net>
   4
   5     This file is part of pwmd.
   6
   7     Pwmd is free software: you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation, either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     Pwmd is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with Pwmd.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20 #include <gcrypt.h>
  21 #include <string.h>
  22 #include "cipher.h"
  23
  24 unsigned
  25 gcrypt_to_cipher (int n)
  26 {
  27   if (n == GCRY_CIPHER_AES128)
  28     return PWMD_CIPHER_AES128;
  29   else if (n == GCRY_CIPHER_AES192)
  30     return PWMD_CIPHER_AES192;
  31   else if (n == GCRY_CIPHER_AES256)
  32     return PWMD_CIPHER_AES256;
  33   else if (n == GCRY_CIPHER_SERPENT128)
  34     return PWMD_CIPHER_SERPENT128;
  35   else if (n == GCRY_CIPHER_SERPENT192)
  36     return PWMD_CIPHER_SERPENT192;
  37   else if (n == GCRY_CIPHER_SERPENT256)
  38     return PWMD_CIPHER_SERPENT256;
  39   else if (n == GCRY_CIPHER_CAMELLIA128)
  40     return PWMD_CIPHER_CAMELLIA128;
  41   else if (n == GCRY_CIPHER_CAMELLIA192)
  42     return PWMD_CIPHER_CAMELLIA192;
  43   else if (n == GCRY_CIPHER_CAMELLIA256)
  44     return PWMD_CIPHER_CAMELLIA256;
  45   else if (n == GCRY_CIPHER_BLOWFISH)
  46     return PWMD_CIPHER_BLOWFISH;
  47   else if (n == GCRY_CIPHER_3DES)
  48     return PWMD_CIPHER_3DES;
  49   else if (n == GCRY_CIPHER_CAST5)
  50     return PWMD_CIPHER_CAST5;
  51   else if (n == GCRY_CIPHER_TWOFISH)
  52     return PWMD_CIPHER_TWOFISH;
  53   else if (n == GCRY_CIPHER_TWOFISH128)
  54     return PWMD_CIPHER_TWOFISH128;
  55
  56   return PWMD_CIPHER_AES256;
  57 }
  58
  59 int
  60 cipher_to_gcrypt (int flags)
  61 {
  62   if (flags < 0)
  63     return flags;
  64
  65   if (flags & PWMD_CIPHER_AES128)
  66     return GCRY_CIPHER_AES128;
  67   else if (flags & PWMD_CIPHER_AES192)
  68     return GCRY_CIPHER_AES192;
  69   else if (flags & PWMD_CIPHER_AES256)
  70     return GCRY_CIPHER_AES256;
  71   else if (flags & PWMD_CIPHER_SERPENT128)
  72     return GCRY_CIPHER_SERPENT128;
  73   else if (flags & PWMD_CIPHER_SERPENT192)
  74     return GCRY_CIPHER_SERPENT192;
  75   else if (flags & PWMD_CIPHER_SERPENT256)
  76     return GCRY_CIPHER_SERPENT256;
  77   else if (flags & PWMD_CIPHER_CAMELLIA128)
  78     return GCRY_CIPHER_CAMELLIA128;
  79   else if (flags & PWMD_CIPHER_CAMELLIA192)
  80     return GCRY_CIPHER_CAMELLIA192;
  81   else if (flags & PWMD_CIPHER_CAMELLIA256)
  82     return GCRY_CIPHER_CAMELLIA256;
  83   else if (flags & PWMD_CIPHER_BLOWFISH)
  84     return GCRY_CIPHER_BLOWFISH;
  85   else if (flags & PWMD_CIPHER_3DES)
  86     return GCRY_CIPHER_3DES;
  87   else if (flags & PWMD_CIPHER_CAST5)
  88     return GCRY_CIPHER_CAST5;
  89   else if (flags & PWMD_CIPHER_TWOFISH)
  90     return GCRY_CIPHER_TWOFISH;
  91   else if (flags & PWMD_CIPHER_TWOFISH128)
  92     return GCRY_CIPHER_TWOFISH128;
  93
  94   return -1;
  95 }
  96
  97 int
  98 cipher_string_to_cipher (const char *str)
  99 {
 100   int flags = 0;
 101
 102   if (!strcasecmp (str, "aes128"))
 103     flags = PWMD_CIPHER_AES128;
 104   else if (!strcasecmp (str, "aes192"))
 105     flags = PWMD_CIPHER_AES192;
 106   else if (!strcasecmp (str, "aes256"))
 107     flags = PWMD_CIPHER_AES256;
 108   else if (!strcasecmp (str, "serpent128"))
 109     flags = PWMD_CIPHER_SERPENT128;
 110   else if (!strcasecmp (str, "serpent192"))
 111     flags = PWMD_CIPHER_SERPENT192;
 112   else if (!strcasecmp (str, "serpent256"))
 113     flags = PWMD_CIPHER_SERPENT256;
 114   else if (!strcasecmp (str, "camellia128"))
 115     flags = PWMD_CIPHER_CAMELLIA128;
 116   else if (!strcasecmp (str, "camellia192"))
 117     flags = PWMD_CIPHER_CAMELLIA192;
 118   else if (!strcasecmp (str, "camellia256"))
 119     flags = PWMD_CIPHER_CAMELLIA256;
 120   else if (!strcasecmp (str, "blowfish"))
 121     flags = PWMD_CIPHER_BLOWFISH;
 122   else if (!strcasecmp (str, "cast5"))
 123     flags = PWMD_CIPHER_CAST5;
 124   else if (!strcasecmp (str, "3des"))
 125     flags = PWMD_CIPHER_3DES;
 126   else if (!strcasecmp (str, "twofish256"))
 127     flags = PWMD_CIPHER_TWOFISH;
 128   else if (!strcasecmp (str, "twofish128"))
 129     flags = PWMD_CIPHER_TWOFISH128;
 130   else
 131     return -1;
 132
 133   return flags;
 134 }
 135
 136 int
 137 cipher_string_to_gcrypt (const char *str)
 138 {
 139   return cipher_to_gcrypt (cipher_string_to_cipher (str));
 140 }
 141
 142 uint64_t
 143 set_cipher_flag (uint64_t flags, int algo)
 144 {
 145   // Clear all previous cipher bits but keep the flags.
 146   flags &= ~((uint16_t) ((uint32_t) (flags & 0xFFFFFFFF)));
 147   flags |= gcrypt_to_cipher (algo);
 148   return flags;
 149 }