s2_enc.c revision 279264
1/* ssl/s2_enc.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 "ssl_locl.h" 60#ifndef OPENSSL_NO_SSL2 61#include <stdio.h> 62 63int ssl2_enc_init(SSL *s, int client) 64 { 65 /* Max number of bytes needed */ 66 EVP_CIPHER_CTX *rs,*ws; 67 const EVP_CIPHER *c; 68 const EVP_MD *md; 69 int num; 70 71 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL)) 72 { 73 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 74 SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 75 return(0); 76 } 77 ssl_replace_hash(&s->read_hash,md); 78 ssl_replace_hash(&s->write_hash,md); 79 80 if ((s->enc_read_ctx == NULL) && 81 ((s->enc_read_ctx=(EVP_CIPHER_CTX *) 82 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 83 goto err; 84 85 /* make sure it's intialized in case the malloc for enc_write_ctx fails 86 * and we exit with an error */ 87 rs= s->enc_read_ctx; 88 EVP_CIPHER_CTX_init(rs); 89 90 if ((s->enc_write_ctx == NULL) && 91 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 92 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 93 goto err; 94 95 ws= s->enc_write_ctx; 96 EVP_CIPHER_CTX_init(ws); 97 98 num=c->key_len; 99 s->s2->key_material_length=num*2; 100 OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); 101 102 if (ssl2_generate_key_material(s) <= 0) 103 return 0; 104 105 OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg)); 106 EVP_EncryptInit_ex(ws,c,NULL,&(s->s2->key_material[(client)?num:0]), 107 s->session->key_arg); 108 EVP_DecryptInit_ex(rs,c,NULL,&(s->s2->key_material[(client)?0:num]), 109 s->session->key_arg); 110 s->s2->read_key= &(s->s2->key_material[(client)?0:num]); 111 s->s2->write_key= &(s->s2->key_material[(client)?num:0]); 112 return(1); 113err: 114 SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); 115 return(0); 116 } 117 118/* read/writes from s->s2->mac_data using length for encrypt and 119 * decrypt. It sets s->s2->padding and s->[rw]length 120 * if we are encrypting 121 * Returns 0 on error and 1 on success */ 122int ssl2_enc(SSL *s, int send) 123 { 124 EVP_CIPHER_CTX *ds; 125 unsigned long l; 126 int bs; 127 128 if (send) 129 { 130 ds=s->enc_write_ctx; 131 l=s->s2->wlength; 132 } 133 else 134 { 135 ds=s->enc_read_ctx; 136 l=s->s2->rlength; 137 } 138 139 /* check for NULL cipher */ 140 if (ds == NULL) return 1; 141 142 143 bs=ds->cipher->block_size; 144 /* This should be using (bs-1) and bs instead of 7 and 8, but 145 * what the hell. */ 146 if (bs == 8) 147 l=(l+7)/8*8; 148 149 if(EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l) < 1) 150 return 0; 151 152 return 1; 153 } 154 155void ssl2_mac(SSL *s, unsigned char *md, int send) 156 { 157 EVP_MD_CTX c; 158 unsigned char sequence[4],*p,*sec,*act; 159 unsigned long seq; 160 unsigned int len; 161 162 if (send) 163 { 164 seq=s->s2->write_sequence; 165 sec=s->s2->write_key; 166 len=s->s2->wact_data_length; 167 act=s->s2->wact_data; 168 } 169 else 170 { 171 seq=s->s2->read_sequence; 172 sec=s->s2->read_key; 173 len=s->s2->ract_data_length; 174 act=s->s2->ract_data; 175 } 176 177 p= &(sequence[0]); 178 l2n(seq,p); 179 180 /* There has to be a MAC algorithm. */ 181 EVP_MD_CTX_init(&c); 182 EVP_MD_CTX_copy(&c, s->read_hash); 183 EVP_DigestUpdate(&c,sec, 184 EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); 185 EVP_DigestUpdate(&c,act,len); 186 /* the above line also does the pad data */ 187 EVP_DigestUpdate(&c,sequence,4); 188 EVP_DigestFinal_ex(&c,md,NULL); 189 EVP_MD_CTX_cleanup(&c); 190 } 191#else /* !OPENSSL_NO_SSL2 */ 192 193# if PEDANTIC 194static void *dummy=&dummy; 195# endif 196 197#endif 198