Cryptlib/OpenSSL/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 /*
  66  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  67  */
  68
  69 static int md_write(BIO *h, char const *buf, int num);
  70 static int md_read(BIO *h, char *buf, int size);
  71 /*
  72  * static int md_puts(BIO *h, const char *str);
  73  */
  74 static int md_gets(BIO *h, char *str, int size);
  75 static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  76 static int md_new(BIO *h);
  77 static int md_free(BIO *data);
  78 static long md_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  79
  80 static BIO_METHOD methods_md = {
  81     BIO_TYPE_MD, "message digest",
  82     md_write,
  83     md_read,
  84     NULL,                       /* md_puts, */
  85     md_gets,
  86     md_ctrl,
  87     md_new,
  88     md_free,
  89     md_callback_ctrl,
  90 };
  91
  92 BIO_METHOD *BIO_f_md(void)
  93 {
  94     return (&methods_md);
  95 }
  96
  97 static int md_new(BIO *bi)
  98 {
  99     EVP_MD_CTX *ctx;
 100
 101     ctx = EVP_MD_CTX_create();
 102     if (ctx == NULL)
 103         return (0);
 104
 105     bi->init = 0;
 106     bi->ptr = (char *)ctx;
 107     bi->flags = 0;
 108     return (1);
 109 }
 110
 111 static int md_free(BIO *a)
 112 {
 113     if (a == NULL)
 114         return (0);
 115     EVP_MD_CTX_destroy(a->ptr);
 116     a->ptr = NULL;
 117     a->init = 0;
 118     a->flags = 0;
 119     return (1);
 120 }
 121
 122 static int md_read(BIO *b, char *out, int outl)
 123 {
 124     int ret = 0;
 125     EVP_MD_CTX *ctx;
 126
 127     if (out == NULL)
 128         return (0);
 129     ctx = b->ptr;
 130
 131     if ((ctx == NULL) || (b->next_bio == NULL))
 132         return (0);
 133
 134     ret = BIO_read(b->next_bio, out, outl);
 135     if (b->init) {
 136         if (ret > 0) {
 137             if (EVP_DigestUpdate(ctx, (unsigned char *)out,
 138                                  (unsigned int)ret) <= 0)
 139                 return (-1);
 140         }
 141     }
 142     BIO_clear_retry_flags(b);
 143     BIO_copy_next_retry(b);
 144     return (ret);
 145 }
 146
 147 static int md_write(BIO *b, const char *in, int inl)
 148 {
 149     int ret = 0;
 150     EVP_MD_CTX *ctx;
 151
 152     if ((in == NULL) || (inl <= 0))
 153         return (0);
 154     ctx = b->ptr;
 155
 156     if ((ctx != NULL) && (b->next_bio != NULL))
 157         ret = BIO_write(b->next_bio, in, inl);
 158     if (b->init) {
 159         if (ret > 0) {
 160             if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
 161                                   (unsigned int)ret)) {
 162                 BIO_clear_retry_flags(b);
 163                 return 0;
 164             }
 165         }
 166     }
 167     if (b->next_bio != NULL) {
 168         BIO_clear_retry_flags(b);
 169         BIO_copy_next_retry(b);
 170     }
 171     return (ret);
 172 }
 173
 174 static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
 175 {
 176     EVP_MD_CTX *ctx, *dctx, **pctx;
 177     const EVP_MD **ppmd;
 178     EVP_MD *md;
 179     long ret = 1;
 180     BIO *dbio;
 181
 182     ctx = b->ptr;
 183
 184     switch (cmd) {
 185     case BIO_CTRL_RESET:
 186         if (b->init)
 187             ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL);
 188         else
 189             ret = 0;
 190         if (ret > 0)
 191             ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 192         break;
 193     case BIO_C_GET_MD:
 194         if (b->init) {
 195             ppmd = ptr;
 196             *ppmd = ctx->digest;
 197         } else
 198             ret = 0;
 199         break;
 200     case BIO_C_GET_MD_CTX:
 201         pctx = ptr;
 202         *pctx = ctx;
 203         b->init = 1;
 204         break;
 205     case BIO_C_SET_MD_CTX:
 206         if (b->init)
 207             b->ptr = ptr;
 208         else
 209             ret = 0;
 210         break;
 211     case BIO_C_DO_STATE_MACHINE:
 212         BIO_clear_retry_flags(b);
 213         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 214         BIO_copy_next_retry(b);
 215         break;
 216
 217     case BIO_C_SET_MD:
 218         md = ptr;
 219         ret = EVP_DigestInit_ex(ctx, md, NULL);
 220         if (ret > 0)
 221             b->init = 1;
 222         break;
 223     case BIO_CTRL_DUP:
 224         dbio = ptr;
 225         dctx = dbio->ptr;
 226         if (!EVP_MD_CTX_copy_ex(dctx, ctx))
 227             return 0;
 228         b->init = 1;
 229         break;
 230     default:
 231         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 232         break;
 233     }
 234     return (ret);
 235 }
 236
 237 static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 238 {
 239     long ret = 1;
 240
 241     if (b->next_bio == NULL)
 242         return (0);
 243     switch (cmd) {
 244     default:
 245         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 246         break;
 247     }
 248     return (ret);
 249 }
 250
 251 static int md_gets(BIO *bp, char *buf, int size)
 252 {
 253     EVP_MD_CTX *ctx;
 254     unsigned int ret;
 255
 256     ctx = bp->ptr;
 257     if (size < ctx->digest->md_size)
 258         return (0);
 259     if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
 260         return -1;
 261
 262     return ((int)ret);
 263 }
 264
 265 /*-
 266 static int md_puts(bp,str)
 267 BIO *bp;
 268 char *str;
 269         {
 270         return(-1);
 271         }
 272 */