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 <openssl/buffer.h>
  63 #include <openssl/evp.h>
  64
  65 /* BIO_put and BIO_get both add to the digest,
  66  * BIO_gets returns the digest */
  67
  68 static int md_write(BIO *h, char const *buf, int num);
  69 static int md_read(BIO *h, char *buf, int size);
  70 /*static int md_puts(BIO *h, const char *str); */
  71 static int md_gets(BIO *h, char *str, int size);
  72 static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  73 static int md_new(BIO *h);
  74 static int md_free(BIO *data);
  75 static long md_callback_ctrl(BIO *h,int cmd,void (*fp)());
  76
  77 static BIO_METHOD methods_md=
  78         {
  79         BIO_TYPE_MD,"message digest",
  80         md_write,
  81         md_read,
  82         NULL, /* md_puts, */
  83         md_gets,
  84         md_ctrl,
  85         md_new,
  86         md_free,
  87         md_callback_ctrl,
  88         };
  89
  90 BIO_METHOD *BIO_f_md(void)
  91         {
  92         return(&methods_md);
  93         }
  94
  95 static int md_new(BIO *bi)
  96         {
  97         EVP_MD_CTX *ctx;
  98
  99         ctx=(EVP_MD_CTX *)OPENSSL_malloc(sizeof(EVP_MD_CTX));
 100         if (ctx == NULL) return(0);
 101
 102         bi->init=0;
 103         bi->ptr=(char *)ctx;
 104         bi->flags=0;
 105         return(1);
 106         }
 107
 108 static int md_free(BIO *a)
 109         {
 110         if (a == NULL) return(0);
 111         OPENSSL_free(a->ptr);
 112         a->ptr=NULL;
 113         a->init=0;
 114         a->flags=0;
 115         return(1);
 116         }
 117
 118 static int md_read(BIO *b, char *out, int outl)
 119         {
 120         int ret=0;
 121         EVP_MD_CTX *ctx;
 122
 123         if (out == NULL) return(0);
 124         ctx=(EVP_MD_CTX *)b->ptr;
 125
 126         if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
 127
 128         ret=BIO_read(b->next_bio,out,outl);
 129         if (b->init)
 130                 {
 131                 if (ret > 0)
 132                         {
 133                         EVP_DigestUpdate(ctx,(unsigned char *)out,
 134                                 (unsigned int)ret);
 135                         }
 136                 }
 137         BIO_clear_retry_flags(b);
 138         BIO_copy_next_retry(b);
 139         return(ret);
 140         }
 141
 142 static int md_write(BIO *b, const char *in, int inl)
 143         {
 144         int ret=0;
 145         EVP_MD_CTX *ctx;
 146
 147         if ((in == NULL) || (inl <= 0)) return(0);
 148         ctx=(EVP_MD_CTX *)b->ptr;
 149
 150         if ((ctx != NULL) && (b->next_bio != NULL))
 151                 ret=BIO_write(b->next_bio,in,inl);
 152         if (b->init)
 153                 {
 154                 if (ret > 0)
 155                         {
 156                         EVP_DigestUpdate(ctx,(unsigned char *)in,
 157                                 (unsigned int)ret);
 158                         }
 159                 }
 160         BIO_clear_retry_flags(b);
 161         BIO_copy_next_retry(b);
 162         return(ret);
 163         }
 164
 165 static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
 166         {
 167         EVP_MD_CTX *ctx,*dctx,**pctx;
 168         const EVP_MD **ppmd;
 169         EVP_MD *md;
 170         long ret=1;
 171         BIO *dbio;
 172
 173         ctx=(EVP_MD_CTX *)b->ptr;
 174
 175         switch (cmd)
 176                 {
 177         case BIO_CTRL_RESET:
 178                 if (b->init)
 179                         EVP_DigestInit(ctx,ctx->digest);
 180                 else
 181                         ret=0;
 182                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 183                 break;
 184         case BIO_C_GET_MD:
 185                 if (b->init)
 186                         {
 187                         ppmd=(const EVP_MD **)ptr;
 188                         *ppmd=ctx->digest;
 189                         }
 190                 else
 191                         ret=0;
 192                 break;
 193         case BIO_C_GET_MD_CTX:
 194                 if (b->init)
 195                         {
 196                         pctx=(EVP_MD_CTX **)ptr;
 197                         *pctx=ctx;
 198                         }
 199                 else
 200                         ret=0;
 201                 break;
 202         case BIO_C_DO_STATE_MACHINE:
 203                 BIO_clear_retry_flags(b);
 204                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 205                 BIO_copy_next_retry(b);
 206                 break;
 207
 208         case BIO_C_SET_MD:
 209                 md=(EVP_MD *)ptr;
 210                 EVP_DigestInit(ctx,md);
 211                 b->init=1;
 212                 break;
 213         case BIO_CTRL_DUP:
 214                 dbio=(BIO *)ptr;
 215                 dctx=(EVP_MD_CTX *)dbio->ptr;
 216                 memcpy(dctx,ctx,sizeof(ctx));
 217                 b->init=1;
 218                 break;
 219         default:
 220                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 221                 break;
 222                 }
 223         return(ret);
 224         }
 225
 226 static long md_callback_ctrl(BIO *b, int cmd, void (*fp)())
 227         {
 228         long ret=1;
 229
 230         if (b->next_bio == NULL) return(0);
 231         switch (cmd)
 232                 {
 233         default:
 234                 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
 235                 break;
 236                 }
 237         return(ret);
 238         }
 239
 240 static int md_gets(BIO *bp, char *buf, int size)
 241         {
 242         EVP_MD_CTX *ctx;
 243         unsigned int ret;
 244
 245
 246         ctx=(EVP_MD_CTX *)bp->ptr;
 247         if (size < ctx->digest->md_size)
 248                 return(0);
 249         EVP_DigestFinal(ctx,(unsigned char *)buf,&ret);
 250         return((int)ret);
 251         }
 252
 253 /*
 254 static int md_puts(bp,str)
 255 BIO *bp;
 256 char *str;
 257         {
 258         return(-1);
 259         }
 260 */
 261