crypto/evp/p_seal.c

   1 /* crypto/evp/p_seal.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/rand.h>
  62 #ifndef OPENSSL_NO_RSA
  63 # include <openssl/rsa.h>
  64 #endif
  65 #include <openssl/evp.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/x509.h>
  68
  69 int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
  70                  unsigned char **ek, int *ekl, unsigned char *iv,
  71                  EVP_PKEY **pubk, int npubk)
  72 {
  73     unsigned char key[EVP_MAX_KEY_LENGTH];
  74     int i;
  75
  76     if (type) {
  77         EVP_CIPHER_CTX_init(ctx);
  78         if (!EVP_EncryptInit_ex(ctx, type, NULL, NULL, NULL))
  79             return 0;
  80     }
  81     if ((npubk <= 0) || !pubk)
  82         return 1;
  83     if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
  84         return 0;
  85     if (EVP_CIPHER_CTX_iv_length(ctx))
  86         RAND_pseudo_bytes(iv, EVP_CIPHER_CTX_iv_length(ctx));
  87
  88     if (!EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
  89         return 0;
  90
  91     for (i = 0; i < npubk; i++) {
  92         ekl[i] =
  93             EVP_PKEY_encrypt_old(ek[i], key, EVP_CIPHER_CTX_key_length(ctx),
  94                                  pubk[i]);
  95         if (ekl[i] <= 0)
  96             return (-1);
  97     }
  98     return (npubk);
  99 }
 100
 101 /*- MACRO
 102 void EVP_SealUpdate(ctx,out,outl,in,inl)
 103 EVP_CIPHER_CTX *ctx;
 104 unsigned char *out;
 105 int *outl;
 106 unsigned char *in;
 107 int inl;
 108         {
 109         EVP_EncryptUpdate(ctx,out,outl,in,inl);
 110         }
 111 */
 112
 113 int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 114 {
 115     int i;
 116     i = EVP_EncryptFinal_ex(ctx, out, outl);
 117     if (i)
 118         i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL);
 119     return i;
 120 }