crypto/openssl-0.9.7e/crypto/evp/evp_lib.c

   1 /* crypto/evp/evp_lib.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 #include <openssl/evp.h>
  62 #include <openssl/objects.h>
  63
  64 int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  65         {
  66         int ret;
  67
  68         if (c->cipher->set_asn1_parameters != NULL)
  69                 ret=c->cipher->set_asn1_parameters(c,type);
  70         else
  71                 return -1;
  72         return(ret);
  73         }
  74
  75 int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  76         {
  77         int ret;
  78
  79         if (c->cipher->get_asn1_parameters != NULL)
  80                 ret=c->cipher->get_asn1_parameters(c,type);
  81         else
  82                 return -1;
  83         return(ret);
  84         }
  85
  86 int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
  87         {
  88         int i=0,l;
  89
  90         if (type != NULL)
  91                 {
  92                 l=EVP_CIPHER_CTX_iv_length(c);
  93                 OPENSSL_assert(l <= sizeof c->iv);
  94                 i=ASN1_TYPE_get_octetstring(type,c->oiv,l);
  95                 if (i != l)
  96                         return(-1);
  97                 else if (i > 0)
  98                         memcpy(c->iv,c->oiv,l);
  99                 }
 100         return(i);
 101         }
 102
 103 int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
 104         {
 105         int i=0,j;
 106
 107         if (type != NULL)
 108                 {
 109                 j=EVP_CIPHER_CTX_iv_length(c);
 110                 OPENSSL_assert(j <= sizeof c->iv);
 111                 i=ASN1_TYPE_set_octetstring(type,c->oiv,j);
 112                 }
 113         return(i);
 114         }
 115
 116 /* Convert the various cipher NIDs and dummies to a proper OID NID */
 117 int EVP_CIPHER_type(const EVP_CIPHER *ctx)
 118 {
 119         int nid;
 120         ASN1_OBJECT *otmp;
 121         nid = EVP_CIPHER_nid(ctx);
 122
 123         switch(nid) {
 124
 125                 case NID_rc2_cbc:
 126                 case NID_rc2_64_cbc:
 127                 case NID_rc2_40_cbc:
 128
 129                 return NID_rc2_cbc;
 130
 131                 case NID_rc4:
 132                 case NID_rc4_40:
 133
 134                 return NID_rc4;
 135
 136                 case NID_aes_128_cfb128:
 137                 case NID_aes_128_cfb8:
 138                 case NID_aes_128_cfb1:
 139
 140                 return NID_aes_128_cfb128;
 141
 142                 case NID_aes_192_cfb128:
 143                 case NID_aes_192_cfb8:
 144                 case NID_aes_192_cfb1:
 145
 146                 return NID_aes_192_cfb128;
 147
 148                 case NID_aes_256_cfb128:
 149                 case NID_aes_256_cfb8:
 150                 case NID_aes_256_cfb1:
 151
 152                 return NID_aes_256_cfb128;
 153
 154                 case NID_des_cfb64:
 155                 case NID_des_cfb8:
 156                 case NID_des_cfb1:
 157
 158                 return NID_des_cfb64;
 159
 160                 default:
 161                 /* Check it has an OID and it is valid */
 162                 otmp = OBJ_nid2obj(nid);
 163                 if(!otmp || !otmp->data) nid = NID_undef;
 164                 ASN1_OBJECT_free(otmp);
 165                 return nid;
 166         }
 167 }
 168