crypto/evp/p_open.c

   1 /* crypto/evp/p_open.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_RSA
  63
  64 #include <openssl/evp.h>
  65 #include <openssl/objects.h>
  66 #include <openssl/x509.h>
  67
  68 int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char *ek,
  69              int ekl, unsigned char *iv, EVP_PKEY *priv)
  70         {
  71         unsigned char *key=NULL;
  72         int i,size=0,ret=0;
  73
  74         if(type) {
  75                 EVP_CIPHER_CTX_init(ctx);
  76                 if(!EVP_DecryptInit_ex(ctx,type,NULL, NULL,NULL)) return 0;
  77         }
  78
  79         if(!priv) return 1;
  80
  81         if (priv->type != EVP_PKEY_RSA)
  82                 {
  83                 EVPerr(EVP_F_EVP_OPENINIT,EVP_R_PUBLIC_KEY_NOT_RSA);
  84                 goto err;
  85                 }
  86
  87         size=RSA_size(priv->pkey.rsa);
  88         key=(unsigned char *)OPENSSL_malloc(size+2);
  89         if (key == NULL)
  90                 {
  91                 /* ERROR */
  92                 EVPerr(EVP_F_EVP_OPENINIT,ERR_R_MALLOC_FAILURE);
  93                 goto err;
  94                 }
  95
  96         i=EVP_PKEY_decrypt(key,ek,ekl,priv);
  97         if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i))
  98                 {
  99                 /* ERROR */
 100                 goto err;
 101                 }
 102         if(!EVP_DecryptInit_ex(ctx,NULL,NULL,key,iv)) goto err;
 103
 104         ret=1;
 105 err:
 106         if (key != NULL) OPENSSL_cleanse(key,size);
 107         OPENSSL_free(key);
 108         return(ret);
 109         }
 110
 111 int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 112         {
 113         int i;
 114
 115         i=EVP_DecryptFinal_ex(ctx,out,outl);
 116         EVP_DecryptInit_ex(ctx,NULL,NULL,NULL,NULL);
 117         return(i);
 118         }
 119 #else /* !OPENSSL_NO_RSA */
 120
 121 # ifdef PEDANTIC
 122 static void *dummy=&dummy;
 123 # endif
 124
 125 #endif