crypto/evp/p_seal.c

   1 /* crypto/evp/p_seal.c */
   2 /* Copyright (C) 1995-1997 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 "rand.h"
  62 #include "rsa.h"
  63 #include "evp.h"
  64 #include "objects.h"
  65 #include "x509.h"
  66
  67 int EVP_SealInit(ctx,type,ek,ekl,iv,pubk,npubk)
  68 EVP_CIPHER_CTX *ctx;
  69 EVP_CIPHER *type;
  70 unsigned char **ek;
  71 int *ekl;
  72 unsigned char *iv;
  73 EVP_PKEY **pubk;
  74 int npubk;
  75         {
  76         unsigned char key[EVP_MAX_KEY_LENGTH];
  77         int i,ret=0,n;
  78
  79         if (npubk <= 0) return(0);
  80         RAND_bytes(key,EVP_MAX_KEY_LENGTH);
  81         if (type->iv_len > 0)
  82                 RAND_bytes(iv,type->iv_len);
  83
  84         EVP_EncryptInit(ctx,type,key,iv);
  85         for (i=0; i<npubk; i++)
  86                 {
  87                 if (pubk[i]->type != EVP_PKEY_RSA)
  88                         {
  89                         EVPerr(EVP_F_EVP_SEALINIT,EVP_R_PUBLIC_KEY_NOT_RSA);
  90                         goto err;
  91                         }
  92                 n=RSA_public_encrypt(type->key_len,key,ek[i],pubk[i]->pkey.rsa,
  93                         RSA_PKCS1_PADDING);
  94                 if (n <= 0) goto err;
  95                 ekl[i]=n;
  96                 }
  97         ret=npubk;
  98 err:
  99         memset(key,0,EVP_MAX_KEY_LENGTH);
 100         return(ret);
 101         }
 102
 103 /* MACRO
 104 void EVP_SealUpdate(ctx,out,outl,in,inl)
 105 EVP_CIPHER_CTX *ctx;
 106 unsigned char *out;
 107 int *outl;
 108 unsigned char *in;
 109 int inl;
 110         {
 111         EVP_EncryptUpdate(ctx,out,outl,in,inl);
 112         }
 113 */
 114
 115 void EVP_SealFinal(ctx,out,outl)
 116 EVP_CIPHER_CTX *ctx;
 117 unsigned char *out;
 118 int *outl;
 119         {
 120         EVP_EncryptFinal(ctx,out,outl);
 121         EVP_EncryptInit(ctx,NULL,NULL,NULL);
 122         }