s2_enc.c revision 160817
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)) 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 78 s->read_hash=md; 79 s->write_hash=md; 80 81 if ((s->enc_read_ctx == NULL) && 82 ((s->enc_read_ctx=(EVP_CIPHER_CTX *) 83 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 84 goto err; 85 if ((s->enc_write_ctx == NULL) && 86 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 87 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 88 goto err; 89 90 rs= s->enc_read_ctx; 91 ws= s->enc_write_ctx; 92 93 EVP_CIPHER_CTX_init(rs); 94 EVP_CIPHER_CTX_init(ws); 95 96 num=c->key_len; 97 s->s2->key_material_length=num*2; 98 OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); 99 100 if (ssl2_generate_key_material(s) <= 0) 101 return 0; 102 103 OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg)); 104 EVP_EncryptInit_ex(ws,c,NULL,&(s->s2->key_material[(client)?num:0]), 105 s->session->key_arg); 106 EVP_DecryptInit_ex(rs,c,NULL,&(s->s2->key_material[(client)?0:num]), 107 s->session->key_arg); 108 s->s2->read_key= &(s->s2->key_material[(client)?0:num]); 109 s->s2->write_key= &(s->s2->key_material[(client)?num:0]); 110 return(1); 111err: 112 SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); 113 return(0); 114 } 115 116/* read/writes from s->s2->mac_data using length for encrypt and 117 * decrypt. It sets s->s2->padding and s->[rw]length 118 * if we are encrypting */ 119void ssl2_enc(SSL *s, int send) 120 { 121 EVP_CIPHER_CTX *ds; 122 unsigned long l; 123 int bs; 124 125 if (send) 126 { 127 ds=s->enc_write_ctx; 128 l=s->s2->wlength; 129 } 130 else 131 { 132 ds=s->enc_read_ctx; 133 l=s->s2->rlength; 134 } 135 136 /* check for NULL cipher */ 137 if (ds == NULL) return; 138 139 140 bs=ds->cipher->block_size; 141 /* This should be using (bs-1) and bs instead of 7 and 8, but 142 * what the hell. */ 143 if (bs == 8) 144 l=(l+7)/8*8; 145 146 EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); 147 } 148 149void ssl2_mac(SSL *s, unsigned char *md, int send) 150 { 151 EVP_MD_CTX c; 152 unsigned char sequence[4],*p,*sec,*act; 153 unsigned long seq; 154 unsigned int len; 155 156 if (send) 157 { 158 seq=s->s2->write_sequence; 159 sec=s->s2->write_key; 160 len=s->s2->wact_data_length; 161 act=s->s2->wact_data; 162 } 163 else 164 { 165 seq=s->s2->read_sequence; 166 sec=s->s2->read_key; 167 len=s->s2->ract_data_length; 168 act=s->s2->ract_data; 169 } 170 171 p= &(sequence[0]); 172 l2n(seq,p); 173 174 /* There has to be a MAC algorithm. */ 175 EVP_MD_CTX_init(&c); 176 EVP_DigestInit_ex(&c, s->read_hash, NULL); 177 EVP_DigestUpdate(&c,sec, 178 EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); 179 EVP_DigestUpdate(&c,act,len); 180 /* the above line also does the pad data */ 181 EVP_DigestUpdate(&c,sequence,4); 182 EVP_DigestFinal_ex(&c,md,NULL); 183 EVP_MD_CTX_cleanup(&c); 184 } 185#else /* !OPENSSL_NO_SSL2 */ 186 187# if PEDANTIC 188static void *dummy=&dummy; 189# endif 190 191#endif 192