crypto/pem/pem_seal.c

   1 /* crypto/pem/pem_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 #ifndef OPENSSL_NO_RSA
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/evp.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65 #include <openssl/x509.h>
  66 #include <openssl/pem.h>
  67
  68 int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
  69              unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk,
  70              int npubk)
  71         {
  72         unsigned char key[EVP_MAX_KEY_LENGTH];
  73         int ret= -1;
  74         int i,j,max=0;
  75         char *s=NULL;
  76
  77         for (i=0; i<npubk; i++)
  78                 {
  79                 if (pubk[i]->type != EVP_PKEY_RSA)
  80                         {
  81                         PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA);
  82                         goto err;
  83                         }
  84                 j=RSA_size(pubk[i]->pkey.rsa);
  85                 if (j > max) max=j;
  86                 }
  87         s=(char *)OPENSSL_malloc(max*2);
  88         if (s == NULL)
  89                 {
  90                 PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE);
  91                 goto err;
  92                 }
  93
  94         EVP_EncodeInit(&ctx->encode);
  95
  96         EVP_MD_CTX_init(&ctx->md);
  97         EVP_SignInit(&ctx->md,md_type);
  98
  99         EVP_CIPHER_CTX_init(&ctx->cipher);
 100         ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);
 101         if (!ret) goto err;
 102
 103         /* base64 encode the keys */
 104         for (i=0; i<npubk; i++)
 105                 {
 106                 j=EVP_EncodeBlock((unsigned char *)s,ek[i],
 107                         RSA_size(pubk[i]->pkey.rsa));
 108                 ekl[i]=j;
 109                 memcpy(ek[i],s,j+1);
 110                 }
 111
 112         ret=npubk;
 113 err:
 114         if (s != NULL) OPENSSL_free(s);
 115         memset(key,0,EVP_MAX_KEY_LENGTH);
 116         return(ret);
 117         }
 118
 119 void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
 120              unsigned char *in, int inl)
 121         {
 122         unsigned char buffer[1600];
 123         int i,j;
 124
 125         *outl=0;
 126         EVP_SignUpdate(&ctx->md,in,inl);
 127         for (;;)
 128                 {
 129                 if (inl <= 0) break;
 130                 if (inl > 1200)
 131                         i=1200;
 132                 else
 133                         i=inl;
 134                 EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i);
 135                 EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j);
 136                 *outl+=j;
 137                 out+=j;
 138                 in+=i;
 139                 inl-=i;
 140                 }
 141         }
 142
 143 int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
 144              unsigned char *out, int *outl, EVP_PKEY *priv)
 145         {
 146         unsigned char *s=NULL;
 147         int ret=0,j;
 148         unsigned int i;
 149
 150         if (priv->type != EVP_PKEY_RSA)
 151                 {
 152                 PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA);
 153                 goto err;
 154                 }
 155         i=RSA_size(priv->pkey.rsa);
 156         if (i < 100) i=100;
 157         s=(unsigned char *)OPENSSL_malloc(i*2);
 158         if (s == NULL)
 159                 {
 160                 PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE);
 161                 goto err;
 162                 }
 163
 164         EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i);
 165         EVP_EncodeUpdate(&ctx->encode,out,&j,s,i);
 166         *outl=j;
 167         out+=j;
 168         EVP_EncodeFinal(&ctx->encode,out,&j);
 169         *outl+=j;
 170
 171         if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err;
 172         *sigl=EVP_EncodeBlock(sig,s,i);
 173
 174         ret=1;
 175 err:
 176         EVP_MD_CTX_cleanup(&ctx->md);
 177         EVP_CIPHER_CTX_cleanup(&ctx->cipher);
 178         if (s != NULL) OPENSSL_free(s);
 179         return(ret);
 180         }
 181 #else /* !OPENSSL_NO_RSA */
 182
 183 # if PEDANTIC
 184 static void *dummy=&dummy;
 185 # endif
 186
 187 #endif