1 /* $OpenBSD: bio_md.c,v 1.15 2018/05/02 15:51:41 tb Exp $ */ 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 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 const BIO_METHOD methods_md = { 78 .type = BIO_TYPE_MD, 79 .name = "message digest", 80 .bwrite = md_write, 81 .bread = md_read, 82 .bgets = md_gets, 83 .ctrl = md_ctrl, 84 .create = md_new, 85 .destroy = md_free, 86 .callback_ctrl = md_callback_ctrl 87 }; 88 89 const BIO_METHOD * 90 BIO_f_md(void) 91 { 92 return (&methods_md); 93 } 94 95 static int 96 md_new(BIO *bi) 97 { 98 EVP_MD_CTX *ctx; 99 100 ctx = EVP_MD_CTX_create(); 101 if (ctx == NULL) 102 return (0); 103 104 bi->init = 0; 105 bi->ptr = (char *)ctx; 106 bi->flags = 0; 107 return (1); 108 } 109 110 static int 111 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 123 md_read(BIO *b, char *out, int outl) 124 { 125 int ret = 0; 126 EVP_MD_CTX *ctx; 127 128 if (out == NULL) 129 return (0); 130 ctx = b->ptr; 131 132 if ((ctx == NULL) || (b->next_bio == NULL)) 133 return (0); 134 135 ret = BIO_read(b->next_bio, out, outl); 136 if (b->init) { 137 if (ret > 0) { 138 if (EVP_DigestUpdate(ctx, (unsigned char *)out, 139 (unsigned int)ret) <= 0) 140 return (-1); 141 } 142 } 143 BIO_clear_retry_flags(b); 144 BIO_copy_next_retry(b); 145 return (ret); 146 } 147 148 static int 149 md_write(BIO *b, const char *in, int inl) 150 { 151 int ret = 0; 152 EVP_MD_CTX *ctx; 153 154 if ((in == NULL) || (inl <= 0)) 155 return (0); 156 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 if (ret > 0) { 162 if (!EVP_DigestUpdate(ctx, (const unsigned char *)in, 163 (unsigned int)ret)) { 164 BIO_clear_retry_flags(b); 165 return 0; 166 } 167 } 168 } 169 if (b->next_bio != NULL) { 170 BIO_clear_retry_flags(b); 171 BIO_copy_next_retry(b); 172 } 173 return (ret); 174 } 175 176 static long 177 md_ctrl(BIO *b, int cmd, long num, void *ptr) 178 { 179 EVP_MD_CTX *ctx, *dctx, **pctx; 180 const EVP_MD **ppmd; 181 EVP_MD *md; 182 long ret = 1; 183 BIO *dbio; 184 185 ctx = b->ptr; 186 187 switch (cmd) { 188 case BIO_CTRL_RESET: 189 if (b->init) 190 ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL); 191 else 192 ret = 0; 193 if (ret > 0) 194 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 195 break; 196 case BIO_C_GET_MD: 197 if (b->init) { 198 ppmd = ptr; 199 *ppmd = ctx->digest; 200 } else 201 ret = 0; 202 break; 203 case BIO_C_GET_MD_CTX: 204 pctx = ptr; 205 *pctx = ctx; 206 b->init = 1; 207 break; 208 case BIO_C_SET_MD_CTX: 209 if (b->init) 210 b->ptr = ptr; 211 else 212 ret = 0; 213 break; 214 case BIO_C_DO_STATE_MACHINE: 215 BIO_clear_retry_flags(b); 216 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 217 BIO_copy_next_retry(b); 218 break; 219 220 case BIO_C_SET_MD: 221 md = ptr; 222 ret = EVP_DigestInit_ex(ctx, md, NULL); 223 if (ret > 0) 224 b->init = 1; 225 break; 226 case BIO_CTRL_DUP: 227 dbio = ptr; 228 dctx = dbio->ptr; 229 if (!EVP_MD_CTX_copy_ex(dctx, ctx)) 230 return 0; 231 b->init = 1; 232 break; 233 default: 234 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 235 break; 236 } 237 return (ret); 238 } 239 240 static long 241 md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 242 { 243 long ret = 1; 244 245 if (b->next_bio == NULL) 246 return (0); 247 switch (cmd) { 248 default: 249 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 250 break; 251 } 252 return (ret); 253 } 254 255 static int 256 md_gets(BIO *bp, char *buf, int size) 257 { 258 EVP_MD_CTX *ctx; 259 unsigned int ret; 260 261 ctx = bp->ptr; 262 if (size < ctx->digest->md_size) 263 return (0); 264 if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0) 265 return -1; 266 267 return ((int)ret); 268 } 269 270 /* 271 static int md_puts(bp,str) 272 BIO *bp; 273 char *str; 274 { 275 return(-1); 276 } 277 */ 278