1/* $OpenBSD: bio_md.c,v 1.22 2024/04/09 13:52:41 beck 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#include "bio_local.h" 66#include "evp_local.h" 67 68/* BIO_put and BIO_get both add to the digest, 69 * BIO_gets returns the digest */ 70 71static int md_write(BIO *h, char const *buf, int num); 72static int md_read(BIO *h, char *buf, int size); 73/*static int md_puts(BIO *h, const char *str); */ 74static int md_gets(BIO *h, char *str, int size); 75static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2); 76static int md_new(BIO *h); 77static int md_free(BIO *data); 78static long md_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); 79 80static const BIO_METHOD methods_md = { 81 .type = BIO_TYPE_MD, 82 .name = "message digest", 83 .bwrite = md_write, 84 .bread = md_read, 85 .bgets = md_gets, 86 .ctrl = md_ctrl, 87 .create = md_new, 88 .destroy = md_free, 89 .callback_ctrl = md_callback_ctrl 90}; 91 92const BIO_METHOD * 93BIO_f_md(void) 94{ 95 return (&methods_md); 96} 97LCRYPTO_ALIAS(BIO_f_md); 98 99static int 100md_new(BIO *bi) 101{ 102 EVP_MD_CTX *ctx; 103 104 ctx = EVP_MD_CTX_create(); 105 if (ctx == NULL) 106 return (0); 107 108 bi->init = 0; 109 bi->ptr = (char *)ctx; 110 bi->flags = 0; 111 return (1); 112} 113 114static int 115md_free(BIO *a) 116{ 117 if (a == NULL) 118 return (0); 119 EVP_MD_CTX_destroy(a->ptr); 120 a->ptr = NULL; 121 a->init = 0; 122 a->flags = 0; 123 return (1); 124} 125 126static int 127md_read(BIO *b, char *out, int outl) 128{ 129 int ret = 0; 130 EVP_MD_CTX *ctx; 131 132 if (out == NULL) 133 return (0); 134 ctx = b->ptr; 135 136 if ((ctx == NULL) || (b->next_bio == NULL)) 137 return (0); 138 139 ret = BIO_read(b->next_bio, out, outl); 140 if (b->init) { 141 if (ret > 0) { 142 if (EVP_DigestUpdate(ctx, (unsigned char *)out, 143 (unsigned int)ret) <= 0) 144 return (-1); 145 } 146 } 147 BIO_clear_retry_flags(b); 148 BIO_copy_next_retry(b); 149 return (ret); 150} 151 152static int 153md_write(BIO *b, const char *in, int inl) 154{ 155 int ret = 0; 156 EVP_MD_CTX *ctx; 157 158 if ((in == NULL) || (inl <= 0)) 159 return (0); 160 ctx = b->ptr; 161 162 if ((ctx != NULL) && (b->next_bio != NULL)) 163 ret = BIO_write(b->next_bio, in, inl); 164 if (b->init) { 165 if (ret > 0) { 166 if (!EVP_DigestUpdate(ctx, (const unsigned char *)in, 167 (unsigned int)ret)) { 168 BIO_clear_retry_flags(b); 169 return 0; 170 } 171 } 172 } 173 if (b->next_bio != NULL) { 174 BIO_clear_retry_flags(b); 175 BIO_copy_next_retry(b); 176 } 177 return (ret); 178} 179 180static long 181md_ctrl(BIO *b, int cmd, long num, void *ptr) 182{ 183 EVP_MD_CTX *ctx, *dctx, **pctx; 184 const EVP_MD **ppmd; 185 EVP_MD *md; 186 long ret = 1; 187 BIO *dbio; 188 189 ctx = b->ptr; 190 191 switch (cmd) { 192 case BIO_CTRL_RESET: 193 if (b->init) 194 ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL); 195 else 196 ret = 0; 197 if (ret > 0) 198 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 199 break; 200 case BIO_C_GET_MD: 201 if (b->init) { 202 ppmd = ptr; 203 *ppmd = ctx->digest; 204 } else 205 ret = 0; 206 break; 207 case BIO_C_GET_MD_CTX: 208 pctx = ptr; 209 *pctx = ctx; 210 b->init = 1; 211 break; 212 case BIO_C_SET_MD_CTX: 213 if (b->init) 214 b->ptr = ptr; 215 else 216 ret = 0; 217 break; 218 case BIO_C_DO_STATE_MACHINE: 219 BIO_clear_retry_flags(b); 220 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 221 BIO_copy_next_retry(b); 222 break; 223 224 case BIO_C_SET_MD: 225 md = ptr; 226 ret = EVP_DigestInit_ex(ctx, md, NULL); 227 if (ret > 0) 228 b->init = 1; 229 break; 230 case BIO_CTRL_DUP: 231 dbio = ptr; 232 dctx = dbio->ptr; 233 if (!EVP_MD_CTX_copy_ex(dctx, ctx)) 234 return 0; 235 b->init = 1; 236 break; 237 default: 238 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 239 break; 240 } 241 return (ret); 242} 243 244static long 245md_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 246{ 247 long ret = 1; 248 249 if (b->next_bio == NULL) 250 return (0); 251 switch (cmd) { 252 default: 253 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 254 break; 255 } 256 return (ret); 257} 258 259static int 260md_gets(BIO *bp, char *buf, int size) 261{ 262 EVP_MD_CTX *ctx; 263 unsigned int ret; 264 265 ctx = bp->ptr; 266 if (size < ctx->digest->md_size) 267 return (0); 268 if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0) 269 return -1; 270 271 return ((int)ret); 272} 273 274/* 275static int md_puts(bp,str) 276BIO *bp; 277char *str; 278 { 279 return(-1); 280 } 281*/ 282