crypto/evp/bio_md.c

   1 /* crypto/evp/bio_md.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 <errno.h>
  61 #include "cryptlib.h"
  62 #include "buffer.h"
  63 #include "evp.h"
  64
  65 /* BIO_put and BIO_get both add to the digest,
  66  * BIO_gets returns the digest */
  67
  68 #ifndef NOPROTO
  69 static int md_write(BIO *h,char *buf,int num);
  70 static int md_read(BIO *h,char *buf,int size);
  71 /*static int md_puts(BIO *h,char *str); */
  72 static int md_gets(BIO *h,char *str,int size);
  73 static long md_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  74 static int md_new(BIO *h);
  75 static int md_free(BIO *data);
  76 #else
  77 static int md_write();
  78 static int md_read();
  79 /*static int md_puts(); */
  80 static int md_gets();
  81 static long md_ctrl();
  82 static int md_new();
  83 static int md_free();
  84 #endif
  85
  86 static BIO_METHOD methods_md=
  87         {
  88         BIO_TYPE_MD,"message digest",
  89         md_write,
  90         md_read,
  91         NULL, /* md_puts, */
  92         md_gets,
  93         md_ctrl,
  94         md_new,
  95         md_free,
  96         };
  97
  98 BIO_METHOD *BIO_f_md(void)
  99         {
 100         return(&methods_md);
 101         }
 102
 103 static int md_new(BIO *bi)
 104         {
 105         EVP_MD_CTX *ctx;
 106
 107         ctx=(EVP_MD_CTX *)Malloc(sizeof(EVP_MD_CTX));
 108         if (ctx == NULL) return(0);
 109
 110         bi->init=0;
 111         bi->ptr=(char *)ctx;
 112         bi->flags=0;
 113         return(1);
 114         }
 115
 116 static int md_free(BIO *a)
 117         {
 118         if (a == NULL) return(0);
 119         Free(a->ptr);
 120         a->ptr=NULL;
 121         a->init=0;
 122         a->flags=0;
 123         return(1);
 124         }
 125
 126 static int md_read(BIO *b, char *out, int outl)
 127         {
 128         int ret=0;
 129         EVP_MD_CTX *ctx;
 130
 131         if (out == NULL) return(0);
 132         ctx=(EVP_MD_CTX *)b->ptr;
 133
 134         if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
 135
 136         ret=BIO_read(b->next_bio,out,outl);
 137         if (b->init)
 138                 {
 139                 if (ret > 0)
 140                         {
 141                         EVP_DigestUpdate(ctx,(unsigned char *)out,
 142                                 (unsigned int)ret);
 143                         }
 144                 }
 145         BIO_clear_retry_flags(b);
 146         BIO_copy_next_retry(b);
 147         return(ret);
 148         }
 149
 150 static int md_write(BIO *b, char *in, int inl)
 151         {
 152         int ret=0;
 153         EVP_MD_CTX *ctx;
 154
 155         if ((in == NULL) || (inl <= 0)) return(0);
 156         ctx=(EVP_MD_CTX *)b->ptr;
 157
 158         if ((ctx != NULL) && (b->next_bio != NULL))
 159                 ret=BIO_write(b->next_bio,in,inl);
 160         if (b->init)
 161                 {
 162                 if (ret > 0)
 163                         {
 164                         EVP_DigestUpdate(ctx,(unsigned char *)in,
 165                                 (unsigned int)ret);
 166                         }
 167                 }
 168         BIO_clear_retry_flags(b);
 169         BIO_copy_next_retry(b);
 170         return(ret);
 171         }
 172
 173 static long md_ctrl(BIO *b, int cmd, long num, char *ptr)
 174         {
 175         EVP_MD_CTX *ctx,*dctx,**pctx;
 176         const EVP_MD **ppmd;
 177         EVP_MD *md;
 178         long ret=1;
 179         BIO *dbio;
 180
 181         ctx=(EVP_MD_CTX *)b->ptr;
 182
 183         switch (cmd)
 184                 {
 185         case BIO_CTRL_RESET:
 186                 if (b->init)
 187                         EVP_DigestInit(ctx,ctx->digest);
 188                 else
 189                         ret=0;
 190                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 191                 break;
 192         case BIO_C_GET_MD:
 193                 if (b->init)
 194                         {
 195                         ppmd=(const EVP_MD **)ptr;
 196                         *ppmd=ctx->digest;
 197                         }
 198                 else
 199                         ret=0;
 200                 break;
 201         case BIO_C_GET_MD_CTX:
 202                 if (b->init)
 203                         {
 204                         pctx=(EVP_MD_CTX **)ptr;
 205                         *pctx=ctx;
 206                         }
 207                 else
 208                         ret=0;
 209                 break;
 210         case BIO_C_DO_STATE_MACHINE:
 211                 BIO_clear_retry_flags(b);
 212                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 213                 BIO_copy_next_retry(b);
 214                 break;
 215
 216         case BIO_C_SET_MD:
 217                 md=(EVP_MD *)ptr;
 218                 EVP_DigestInit(ctx,md);
 219                 b->init=1;
 220                 break;
 221         case BIO_CTRL_DUP:
 222                 dbio=(BIO *)ptr;
 223                 dctx=(EVP_MD_CTX *)dbio->ptr;
 224                 memcpy(dctx,ctx,sizeof(ctx));
 225                 b->init=1;
 226                 break;
 227         default:
 228                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 229                 break;
 230                 }
 231         return(ret);
 232         }
 233
 234 static int md_gets(BIO *bp, char *buf, int size)
 235         {
 236         EVP_MD_CTX *ctx;
 237         unsigned int ret;
 238
 239
 240         ctx=(EVP_MD_CTX *)bp->ptr;
 241         if (size < ctx->digest->md_size)
 242                 return(0);
 243         EVP_DigestFinal(ctx,(unsigned char *)buf,&ret);
 244         return((int)ret);
 245         }
 246
 247 /*
 248 static int md_puts(bp,str)
 249 BIO *bp;
 250 char *str;
 251         {
 252         return(-1);
 253         }
 254 */
 255