crypto/openssl-0.9.7d/crypto/evp/e_rc2.c

   1 /* crypto/evp/e_rc2.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #ifndef OPENSSL_NO_RC2
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include <openssl/evp.h>
  64 #include <openssl/objects.h>
  65 #include "evp_locl.h"
  66 #include <openssl/rc2.h>
  67
  68 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  69                         const unsigned char *iv,int enc);
  70 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
  71 static int rc2_magic_to_meth(int i);
  72 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  73 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  74 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  75
  76 typedef struct
  77         {
  78         int key_bits;   /* effective key bits */
  79         RC2_KEY ks;     /* key schedule */
  80         } EVP_RC2_KEY;
  81
  82 #define data(ctx)       ((EVP_RC2_KEY *)(ctx)->cipher_data)
  83
  84 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
  85                         8,
  86                         RC2_KEY_LENGTH, 8, 64,
  87                         EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  88                         rc2_init_key, NULL,
  89                         rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
  90                         rc2_ctrl)
  91
  92 #define RC2_40_MAGIC    0xa0
  93 #define RC2_64_MAGIC    0x78
  94 #define RC2_128_MAGIC   0x3a
  95
  96 static const EVP_CIPHER r2_64_cbc_cipher=
  97         {
  98         NID_rc2_64_cbc,
  99         8,8 /* 64 bit */,8,
 100         EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
 101         rc2_init_key,
 102         rc2_cbc_cipher,
 103         NULL,
 104         sizeof(EVP_RC2_KEY),
 105         rc2_set_asn1_type_and_iv,
 106         rc2_get_asn1_type_and_iv,
 107         rc2_ctrl,
 108         NULL
 109         };
 110
 111 static const EVP_CIPHER r2_40_cbc_cipher=
 112         {
 113         NID_rc2_40_cbc,
 114         8,5 /* 40 bit */,8,
 115         EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
 116         rc2_init_key,
 117         rc2_cbc_cipher,
 118         NULL,
 119         sizeof(EVP_RC2_KEY),
 120         rc2_set_asn1_type_and_iv,
 121         rc2_get_asn1_type_and_iv,
 122         rc2_ctrl,
 123         NULL
 124         };
 125
 126 const EVP_CIPHER *EVP_rc2_64_cbc(void)
 127         {
 128         return(&r2_64_cbc_cipher);
 129         }
 130
 131 const EVP_CIPHER *EVP_rc2_40_cbc(void)
 132         {
 133         return(&r2_40_cbc_cipher);
 134         }
 135
 136 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 137                         const unsigned char *iv, int enc)
 138         {
 139         RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
 140                     key,data(ctx)->key_bits);
 141         return 1;
 142         }
 143
 144 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
 145         {
 146         int i;
 147
 148         EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
 149         if      (i == 128) return(RC2_128_MAGIC);
 150         else if (i == 64)  return(RC2_64_MAGIC);
 151         else if (i == 40)  return(RC2_40_MAGIC);
 152         else return(0);
 153         }
 154
 155 static int rc2_magic_to_meth(int i)
 156         {
 157         if      (i == RC2_128_MAGIC) return 128;
 158         else if (i == RC2_64_MAGIC)  return 64;
 159         else if (i == RC2_40_MAGIC)  return 40;
 160         else
 161                 {
 162                 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
 163                 return(0);
 164                 }
 165         }
 166
 167 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 168         {
 169         long num=0;
 170         int i=0,l;
 171         int key_bits;
 172         unsigned char iv[EVP_MAX_IV_LENGTH];
 173
 174         if (type != NULL)
 175                 {
 176                 l=EVP_CIPHER_CTX_iv_length(c);
 177                 OPENSSL_assert(l <= sizeof iv);
 178                 i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
 179                 if (i != l)
 180                         return(-1);
 181                 key_bits =rc2_magic_to_meth((int)num);
 182                 if (!key_bits)
 183                         return(-1);
 184                 if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1);
 185                 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
 186                 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
 187                 }
 188         return(i);
 189         }
 190
 191 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 192         {
 193         long num;
 194         int i=0,j;
 195
 196         if (type != NULL)
 197                 {
 198                 num=rc2_meth_to_magic(c);
 199                 j=EVP_CIPHER_CTX_iv_length(c);
 200                 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
 201                 }
 202         return(i);
 203         }
 204
 205 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 206         {
 207         switch(type)
 208                 {
 209         case EVP_CTRL_INIT:
 210                 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
 211                 return 1;
 212
 213         case EVP_CTRL_GET_RC2_KEY_BITS:
 214                 *(int *)ptr = data(c)->key_bits;
 215                 return 1;
 216
 217         case EVP_CTRL_SET_RC2_KEY_BITS:
 218                 if(arg > 0)
 219                         {
 220                         data(c)->key_bits = arg;
 221                         return 1;
 222                         }
 223                 return 0;
 224
 225         default:
 226                 return -1;
 227                 }
 228         }
 229
 230 #endif