Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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,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 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 156 | EVP_DigestUpdate(ctx,(const unsigned char *)in, |
| 157 | (unsigned int)ret); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 223 | EVP_MD_CTX_copy_ex(dctx,ctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |