s2_enc.c revision 59194
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 * $FreeBSD: head/crypto/openssl/ssl/s2_enc.c 59194 2000-04-13 07:15:03Z kris $ 59 */ 60 61#include "ssl_locl.h" 62#ifndef NO_SSL2 63#include <stdio.h> 64 65int ssl2_enc_init(SSL *s, int client) 66 { 67 /* Max number of bytes needed */ 68 EVP_CIPHER_CTX *rs,*ws; 69 const EVP_CIPHER *c; 70 const EVP_MD *md; 71 int num; 72 73 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL)) 74 { 75 ssl2_return_error(s,SSL2_PE_NO_CIPHER); 76 SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 77 return(0); 78 } 79 80 s->read_hash=md; 81 s->write_hash=md; 82 83 if ((s->enc_read_ctx == NULL) && 84 ((s->enc_read_ctx=(EVP_CIPHER_CTX *) 85 Malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 86 goto err; 87 if ((s->enc_write_ctx == NULL) && 88 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 89 Malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 90 goto err; 91 92 rs= s->enc_read_ctx; 93 ws= s->enc_write_ctx; 94 95 EVP_CIPHER_CTX_init(rs); 96 EVP_CIPHER_CTX_init(ws); 97 98 num=c->key_len; 99 s->s2->key_material_length=num*2; 100 101 ssl2_generate_key_material(s); 102 103 EVP_EncryptInit(ws,c,&(s->s2->key_material[(client)?num:0]), 104 s->session->key_arg); 105 EVP_DecryptInit(rs,c,&(s->s2->key_material[(client)?0:num]), 106 s->session->key_arg); 107 s->s2->read_key= &(s->s2->key_material[(client)?0:num]); 108 s->s2->write_key= &(s->s2->key_material[(client)?num:0]); 109 return(1); 110err: 111 SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); 112 return(0); 113 } 114 115/* read/writes from s->s2->mac_data using length for encrypt and 116 * decrypt. It sets the s->s2->padding, s->[rw]length and 117 * s->s2->pad_data ptr if we are encrypting */ 118void ssl2_enc(SSL *s, int send) 119 { 120 EVP_CIPHER_CTX *ds; 121 unsigned long l; 122 int bs; 123 124 if (send) 125 { 126 ds=s->enc_write_ctx; 127 l=s->s2->wlength; 128 } 129 else 130 { 131 ds=s->enc_read_ctx; 132 l=s->s2->rlength; 133 } 134 135 /* check for NULL cipher */ 136 if (ds == NULL) return; 137 138 139 bs=ds->cipher->block_size; 140 /* This should be using (bs-1) and bs instead of 7 and 8, but 141 * what the hell. */ 142 if (bs == 8) 143 l=(l+7)/8*8; 144 145 EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); 146 } 147 148void ssl2_mac(SSL *s, unsigned char *md, int send) 149 { 150 EVP_MD_CTX c; 151 unsigned char sequence[4],*p,*sec,*act; 152 unsigned long seq; 153 unsigned int len; 154 155 if (send) 156 { 157 seq=s->s2->write_sequence; 158 sec=s->s2->write_key; 159 len=s->s2->wact_data_length; 160 act=s->s2->wact_data; 161 } 162 else 163 { 164 seq=s->s2->read_sequence; 165 sec=s->s2->read_key; 166 len=s->s2->ract_data_length; 167 act=s->s2->ract_data; 168 } 169 170 p= &(sequence[0]); 171 l2n(seq,p); 172 173 /* There has to be a MAC algorithm. */ 174 EVP_DigestInit(&c,s->read_hash); 175 EVP_DigestUpdate(&c,sec, 176 EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); 177 EVP_DigestUpdate(&c,act,len); 178 /* the above line also does the pad data */ 179 EVP_DigestUpdate(&c,sequence,4); 180 EVP_DigestFinal(&c,md,NULL); 181 /* some would say I should zero the md context */ 182 } 183#else /* !NO_SSL2 */ 184 185# if PEDANTIC 186static void *dummy=&dummy; 187# endif 188 189#endif 190