crypto/evp/e_cbc_r2.c

   1 /* crypto/evp/e_cbc_r2.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 NO_RC2
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include "evp.h"
  64 #include "objects.h"
  65
  66 #ifndef NOPROTO
  67 static void rc2_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
  68         unsigned char *iv,int enc);
  69 static void rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  70         unsigned char *in, unsigned int inl);
  71 static int rc2_meth_to_magic(EVP_CIPHER *e);
  72 static EVP_CIPHER *rc2_magic_to_meth(int i);
  73 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  74 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
  75
  76 #else
  77
  78 static void rc2_cbc_init_key();
  79 static void rc2_cbc_cipher();
  80 static int rc2_meth_to_magic();
  81 static EVP_CIPHER *rc2_magic_to_meth();
  82 static int rc2_set_asn1_type_and_iv();
  83 static int rc2_get_asn1_type_and_iv();
  84 #endif
  85
  86 #define RC2_40_MAGIC    0xa0
  87 #define RC2_64_MAGIC    0x78
  88 #define RC2_128_MAGIC   0x3a
  89
  90 static EVP_CIPHER r2_cbc_cipher=
  91         {
  92         NID_rc2_cbc,
  93         8,EVP_RC2_KEY_SIZE,8,
  94         rc2_cbc_init_key,
  95         rc2_cbc_cipher,
  96         NULL,
  97         sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
  98                 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)),
  99         rc2_set_asn1_type_and_iv,
 100         rc2_get_asn1_type_and_iv,
 101         };
 102
 103 static EVP_CIPHER r2_64_cbc_cipher=
 104         {
 105         NID_rc2_40_cbc,
 106         8,8 /* 64 bit */,8,
 107         rc2_cbc_init_key,
 108         rc2_cbc_cipher,
 109         NULL,
 110         sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
 111                 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)),
 112         rc2_set_asn1_type_and_iv,
 113         rc2_get_asn1_type_and_iv,
 114         };
 115
 116 static EVP_CIPHER r2_40_cbc_cipher=
 117         {
 118         NID_rc2_40_cbc,
 119         8,5 /* 40 bit */,8,
 120         rc2_cbc_init_key,
 121         rc2_cbc_cipher,
 122         NULL,
 123         sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
 124                 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)),
 125         rc2_set_asn1_type_and_iv,
 126         rc2_get_asn1_type_and_iv,
 127         };
 128
 129 EVP_CIPHER *EVP_rc2_cbc()
 130         {
 131         return(&r2_cbc_cipher);
 132         }
 133
 134 EVP_CIPHER *EVP_rc2_64_cbc()
 135         {
 136         return(&r2_64_cbc_cipher);
 137         }
 138
 139 EVP_CIPHER *EVP_rc2_40_cbc()
 140         {
 141         return(&r2_40_cbc_cipher);
 142         }
 143
 144 static void rc2_cbc_init_key(ctx,key,iv,enc)
 145 EVP_CIPHER_CTX *ctx;
 146 unsigned char *key;
 147 unsigned char *iv;
 148 int enc;
 149         {
 150         if (iv != NULL)
 151                 memcpy(&(ctx->oiv[0]),iv,8);
 152         memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
 153         if (key != NULL)
 154                 RC2_set_key(&(ctx->c.rc2_ks),EVP_CIPHER_CTX_key_length(ctx),
 155                         key,EVP_CIPHER_CTX_key_length(ctx)*8);
 156         }
 157
 158 static void rc2_cbc_cipher(ctx,out,in,inl)
 159 EVP_CIPHER_CTX *ctx;
 160 unsigned char *out;
 161 unsigned char *in;
 162 unsigned int inl;
 163         {
 164         RC2_cbc_encrypt(
 165                 in,out,(long)inl,
 166                 &(ctx->c.rc2_ks),&(ctx->iv[0]),
 167                 ctx->encrypt);
 168         }
 169
 170 static int rc2_meth_to_magic(e)
 171 EVP_CIPHER *e;
 172         {
 173         int i;
 174
 175         i=EVP_CIPHER_key_length(e);
 176         if      (i == 128) return(RC2_128_MAGIC);
 177         else if (i == 64)  return(RC2_64_MAGIC);
 178         else if (i == 40)  return(RC2_40_MAGIC);
 179         else return(0);
 180         }
 181
 182 static EVP_CIPHER *rc2_magic_to_meth(i)
 183 int i;
 184         {
 185         if      (i == RC2_128_MAGIC) return(EVP_rc2_cbc());
 186         else if (i == RC2_64_MAGIC)  return(EVP_rc2_64_cbc());
 187         else if (i == RC2_40_MAGIC)  return(EVP_rc2_40_cbc());
 188         else
 189                 {
 190                 EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
 191                 return(NULL);
 192                 }
 193         }
 194
 195 int rc2_get_asn1_type_and_iv(c,type)
 196 EVP_CIPHER_CTX *c;
 197 ASN1_TYPE *type;
 198         {
 199         long num=0;
 200         int i=0,l;
 201         EVP_CIPHER *e;
 202
 203         if (type != NULL)
 204                 {
 205                 l=EVP_CIPHER_CTX_iv_length(c);
 206                 i=ASN1_TYPE_get_int_octetstring(type,&num,c->oiv,l);
 207                 if (i != l)
 208                         return(-1);
 209                 else if (i > 0)
 210                         memcpy(c->iv,c->oiv,l);
 211                 e=rc2_magic_to_meth((int)num);
 212                 if (e == NULL)
 213                         return(-1);
 214                 if (e != EVP_CIPHER_CTX_cipher(c))
 215                         {
 216                         EVP_CIPHER_CTX_cipher(c)=e;
 217                         rc2_cbc_init_key(c,NULL,NULL,1);
 218                         }
 219                 }
 220         return(i);
 221         }
 222
 223 static int rc2_set_asn1_type_and_iv(c,type)
 224 EVP_CIPHER_CTX *c;
 225 ASN1_TYPE *type;
 226         {
 227         long num;
 228         int i=0,j;
 229
 230         if (type != NULL)
 231                 {
 232                 num=rc2_meth_to_magic(EVP_CIPHER_CTX_cipher(c));
 233                 j=EVP_CIPHER_CTX_iv_length(c);
 234                 i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
 235                 }
 236         return(i);
 237         }
 238
 239 #endif