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 #include <stdio.h>
  60 #include "cryptlib.h"
  61
  62 #ifndef OPENSSL_NO_RC2
  63
  64 # include <openssl/evp.h>
  65 # include <openssl/objects.h>
  66 # include "evp_locl.h"
  67 # include <openssl/rc2.h>
  68
  69 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  70                         const unsigned char *iv, int enc);
  71 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
  72 static int 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 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  76
  77 typedef struct {
  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 # define RC2_40_MAGIC    0xa0
  92 # define RC2_64_MAGIC    0x78
  93 # define RC2_128_MAGIC   0x3a
  94 static const EVP_CIPHER r2_64_cbc_cipher = {
  95     NID_rc2_64_cbc,
  96     8, 8 /* 64 bit */ , 8,
  97     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  98     rc2_init_key,
  99     rc2_cbc_cipher,
 100     NULL,
 101     sizeof(EVP_RC2_KEY),
 102     rc2_set_asn1_type_and_iv,
 103     rc2_get_asn1_type_and_iv,
 104     rc2_ctrl,
 105     NULL
 106 };
 107
 108 static const EVP_CIPHER r2_40_cbc_cipher = {
 109     NID_rc2_40_cbc,
 110     8, 5 /* 40 bit */ , 8,
 111     EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
 112     rc2_init_key,
 113     rc2_cbc_cipher,
 114     NULL,
 115     sizeof(EVP_RC2_KEY),
 116     rc2_set_asn1_type_and_iv,
 117     rc2_get_asn1_type_and_iv,
 118     rc2_ctrl,
 119     NULL
 120 };
 121
 122 const EVP_CIPHER *EVP_rc2_64_cbc(void)
 123 {
 124     return (&r2_64_cbc_cipher);
 125 }
 126
 127 const EVP_CIPHER *EVP_rc2_40_cbc(void)
 128 {
 129     return (&r2_40_cbc_cipher);
 130 }
 131
 132 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 133                         const unsigned char *iv, int enc)
 134 {
 135     RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
 136                 key, data(ctx)->key_bits);
 137     return 1;
 138 }
 139
 140 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
 141 {
 142     int i;
 143
 144     EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
 145     if (i == 128)
 146         return (RC2_128_MAGIC);
 147     else if (i == 64)
 148         return (RC2_64_MAGIC);
 149     else if (i == 40)
 150         return (RC2_40_MAGIC);
 151     else
 152         return (0);
 153 }
 154
 155 static int rc2_magic_to_meth(int i)
 156 {
 157     if (i == RC2_128_MAGIC)
 158         return 128;
 159     else if (i == RC2_64_MAGIC)
 160         return 64;
 161     else if (i == RC2_40_MAGIC)
 162         return 40;
 163     else {
 164         EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
 165         return (0);
 166     }
 167 }
 168
 169 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 170 {
 171     long num = 0;
 172     int i = 0;
 173     int key_bits;
 174     unsigned int l;
 175     unsigned char iv[EVP_MAX_IV_LENGTH];
 176
 177     if (type != NULL) {
 178         l = EVP_CIPHER_CTX_iv_length(c);
 179         OPENSSL_assert(l <= sizeof(iv));
 180         i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
 181         if (i != (int)l)
 182             return (-1);
 183         key_bits = rc2_magic_to_meth((int)num);
 184         if (!key_bits)
 185             return (-1);
 186         if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
 187             return -1;
 188         EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
 189         EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
 190     }
 191     return (i);
 192 }
 193
 194 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 195 {
 196     long num;
 197     int i = 0, j;
 198
 199     if (type != NULL) {
 200         num = rc2_meth_to_magic(c);
 201         j = EVP_CIPHER_CTX_iv_length(c);
 202         i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
 203     }
 204     return (i);
 205 }
 206
 207 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 208 {
 209     switch (type) {
 210     case EVP_CTRL_INIT:
 211         data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
 212         return 1;
 213
 214     case EVP_CTRL_GET_RC2_KEY_BITS:
 215         *(int *)ptr = data(c)->key_bits;
 216         return 1;
 217
 218     case EVP_CTRL_SET_RC2_KEY_BITS:
 219         if (arg > 0) {
 220             data(c)->key_bits = arg;
 221             return 1;
 222         }
 223         return 0;
 224 # ifdef PBE_PRF_TEST
 225     case EVP_CTRL_PBE_PRF_NID:
 226         *(int *)ptr = NID_hmacWithMD5;
 227         return 1;
 228 # endif
 229
 230     default:
 231         return -1;
 232     }
 233 }
 234
 235 #endif