1 /* crypto/evp/bio_md.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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,bio_info_cb *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_create(); 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 EVP_MD_CTX_destroy(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=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 if (EVP_DigestUpdate(ctx,(unsigned char *)out, 134 (unsigned int)ret)<=0) return (-1); 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=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,(const unsigned char *)in, 157 (unsigned int)ret); 158 } 159 } 160 if(b->next_bio != NULL) 161 { 162 BIO_clear_retry_flags(b); 163 BIO_copy_next_retry(b); 164 } 165 return(ret); 166 } 167 168 static long md_ctrl(BIO *b, int cmd, long num, void *ptr) 169 { 170 EVP_MD_CTX *ctx,*dctx,**pctx; 171 const EVP_MD **ppmd; 172 EVP_MD *md; 173 long ret=1; 174 BIO *dbio; 175 176 ctx=b->ptr; 177 178 switch (cmd) 179 { 180 case BIO_CTRL_RESET: 181 if (b->init) 182 ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL); 183 else 184 ret=0; 185 if (ret > 0) 186 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 187 break; 188 case BIO_C_GET_MD: 189 if (b->init) 190 { 191 ppmd=ptr; 192 *ppmd=ctx->digest; 193 } 194 else 195 ret=0; 196 break; 197 case BIO_C_GET_MD_CTX: 198 pctx=ptr; 199 *pctx=ctx; 200 b->init = 1; 201 break; 202 case BIO_C_SET_MD_CTX: 203 if (b->init) 204 b->ptr=ptr; 205 else 206 ret=0; 207 break; 208 case BIO_C_DO_STATE_MACHINE: 209 BIO_clear_retry_flags(b); 210 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 211 BIO_copy_next_retry(b); 212 break; 213 214 case BIO_C_SET_MD: 215 md=ptr; 216 ret = EVP_DigestInit_ex(ctx,md, NULL); 217 if (ret > 0) 218 b->init=1; 219 break; 220 case BIO_CTRL_DUP: 221 dbio=ptr; 222 dctx=dbio->ptr; 223 EVP_MD_CTX_copy_ex(dctx,ctx); 224 b->init=1; 225 break; 226 default: 227 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 228 break; 229 } 230 return(ret); 231 } 232 233 static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 234 { 235 long ret=1; 236 237 if (b->next_bio == NULL) return(0); 238 switch (cmd) 239 { 240 default: 241 ret=BIO_callback_ctrl(b->next_bio,cmd,fp); 242 break; 243 } 244 return(ret); 245 } 246 247 static int md_gets(BIO *bp, char *buf, int size) 248 { 249 EVP_MD_CTX *ctx; 250 unsigned int ret; 251 252 253 ctx=bp->ptr; 254 if (size < ctx->digest->md_size) 255 return(0); 256 if (EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret)<=0) 257 return -1; 258 259 return((int)ret); 260 } 261 262 /* 263 static int md_puts(bp,str) 264 BIO *bp; 265 char *str; 266 { 267 return(-1); 268 } 269 */ 270 271
