1*0Sstevel@tonic-gate /* ssl/s2_enc.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include "ssl_locl.h" 60*0Sstevel@tonic-gate #ifndef OPENSSL_NO_SSL2 61*0Sstevel@tonic-gate #include <stdio.h> 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate int ssl2_enc_init(SSL *s, int client) 64*0Sstevel@tonic-gate { 65*0Sstevel@tonic-gate /* Max number of bytes needed */ 66*0Sstevel@tonic-gate EVP_CIPHER_CTX *rs,*ws; 67*0Sstevel@tonic-gate const EVP_CIPHER *c; 68*0Sstevel@tonic-gate const EVP_MD *md; 69*0Sstevel@tonic-gate int num; 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate if (!ssl_cipher_get_evp(s->session,&c,&md,NULL)) 72*0Sstevel@tonic-gate { 73*0Sstevel@tonic-gate ssl2_return_error(s,SSL2_PE_NO_CIPHER); 74*0Sstevel@tonic-gate SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 75*0Sstevel@tonic-gate return(0); 76*0Sstevel@tonic-gate } 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate s->read_hash=md; 79*0Sstevel@tonic-gate s->write_hash=md; 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate if ((s->enc_read_ctx == NULL) && 82*0Sstevel@tonic-gate ((s->enc_read_ctx=(EVP_CIPHER_CTX *) 83*0Sstevel@tonic-gate OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 84*0Sstevel@tonic-gate goto err; 85*0Sstevel@tonic-gate if ((s->enc_write_ctx == NULL) && 86*0Sstevel@tonic-gate ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 87*0Sstevel@tonic-gate OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 88*0Sstevel@tonic-gate goto err; 89*0Sstevel@tonic-gate 90*0Sstevel@tonic-gate rs= s->enc_read_ctx; 91*0Sstevel@tonic-gate ws= s->enc_write_ctx; 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate EVP_CIPHER_CTX_init(rs); 94*0Sstevel@tonic-gate EVP_CIPHER_CTX_init(ws); 95*0Sstevel@tonic-gate 96*0Sstevel@tonic-gate num=c->key_len; 97*0Sstevel@tonic-gate s->s2->key_material_length=num*2; 98*0Sstevel@tonic-gate OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate if (ssl2_generate_key_material(s) <= 0) 101*0Sstevel@tonic-gate return 0; 102*0Sstevel@tonic-gate 103*0Sstevel@tonic-gate OPENSSL_assert(c->iv_len <= sizeof s->session->key_arg); 104*0Sstevel@tonic-gate EVP_EncryptInit_ex(ws,c,NULL,&(s->s2->key_material[(client)?num:0]), 105*0Sstevel@tonic-gate s->session->key_arg); 106*0Sstevel@tonic-gate EVP_DecryptInit_ex(rs,c,NULL,&(s->s2->key_material[(client)?0:num]), 107*0Sstevel@tonic-gate s->session->key_arg); 108*0Sstevel@tonic-gate s->s2->read_key= &(s->s2->key_material[(client)?0:num]); 109*0Sstevel@tonic-gate s->s2->write_key= &(s->s2->key_material[(client)?num:0]); 110*0Sstevel@tonic-gate return(1); 111*0Sstevel@tonic-gate err: 112*0Sstevel@tonic-gate SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); 113*0Sstevel@tonic-gate return(0); 114*0Sstevel@tonic-gate } 115*0Sstevel@tonic-gate 116*0Sstevel@tonic-gate /* read/writes from s->s2->mac_data using length for encrypt and 117*0Sstevel@tonic-gate * decrypt. It sets s->s2->padding and s->[rw]length 118*0Sstevel@tonic-gate * if we are encrypting */ 119*0Sstevel@tonic-gate void ssl2_enc(SSL *s, int send) 120*0Sstevel@tonic-gate { 121*0Sstevel@tonic-gate EVP_CIPHER_CTX *ds; 122*0Sstevel@tonic-gate unsigned long l; 123*0Sstevel@tonic-gate int bs; 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate if (send) 126*0Sstevel@tonic-gate { 127*0Sstevel@tonic-gate ds=s->enc_write_ctx; 128*0Sstevel@tonic-gate l=s->s2->wlength; 129*0Sstevel@tonic-gate } 130*0Sstevel@tonic-gate else 131*0Sstevel@tonic-gate { 132*0Sstevel@tonic-gate ds=s->enc_read_ctx; 133*0Sstevel@tonic-gate l=s->s2->rlength; 134*0Sstevel@tonic-gate } 135*0Sstevel@tonic-gate 136*0Sstevel@tonic-gate /* check for NULL cipher */ 137*0Sstevel@tonic-gate if (ds == NULL) return; 138*0Sstevel@tonic-gate 139*0Sstevel@tonic-gate 140*0Sstevel@tonic-gate bs=ds->cipher->block_size; 141*0Sstevel@tonic-gate /* This should be using (bs-1) and bs instead of 7 and 8, but 142*0Sstevel@tonic-gate * what the hell. */ 143*0Sstevel@tonic-gate if (bs == 8) 144*0Sstevel@tonic-gate l=(l+7)/8*8; 145*0Sstevel@tonic-gate 146*0Sstevel@tonic-gate EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); 147*0Sstevel@tonic-gate } 148*0Sstevel@tonic-gate 149*0Sstevel@tonic-gate void ssl2_mac(SSL *s, unsigned char *md, int send) 150*0Sstevel@tonic-gate { 151*0Sstevel@tonic-gate EVP_MD_CTX c; 152*0Sstevel@tonic-gate unsigned char sequence[4],*p,*sec,*act; 153*0Sstevel@tonic-gate unsigned long seq; 154*0Sstevel@tonic-gate unsigned int len; 155*0Sstevel@tonic-gate 156*0Sstevel@tonic-gate if (send) 157*0Sstevel@tonic-gate { 158*0Sstevel@tonic-gate seq=s->s2->write_sequence; 159*0Sstevel@tonic-gate sec=s->s2->write_key; 160*0Sstevel@tonic-gate len=s->s2->wact_data_length; 161*0Sstevel@tonic-gate act=s->s2->wact_data; 162*0Sstevel@tonic-gate } 163*0Sstevel@tonic-gate else 164*0Sstevel@tonic-gate { 165*0Sstevel@tonic-gate seq=s->s2->read_sequence; 166*0Sstevel@tonic-gate sec=s->s2->read_key; 167*0Sstevel@tonic-gate len=s->s2->ract_data_length; 168*0Sstevel@tonic-gate act=s->s2->ract_data; 169*0Sstevel@tonic-gate } 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate p= &(sequence[0]); 172*0Sstevel@tonic-gate l2n(seq,p); 173*0Sstevel@tonic-gate 174*0Sstevel@tonic-gate /* There has to be a MAC algorithm. */ 175*0Sstevel@tonic-gate EVP_MD_CTX_init(&c); 176*0Sstevel@tonic-gate EVP_DigestInit_ex(&c, s->read_hash, NULL); 177*0Sstevel@tonic-gate EVP_DigestUpdate(&c,sec, 178*0Sstevel@tonic-gate EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); 179*0Sstevel@tonic-gate EVP_DigestUpdate(&c,act,len); 180*0Sstevel@tonic-gate /* the above line also does the pad data */ 181*0Sstevel@tonic-gate EVP_DigestUpdate(&c,sequence,4); 182*0Sstevel@tonic-gate EVP_DigestFinal_ex(&c,md,NULL); 183*0Sstevel@tonic-gate EVP_MD_CTX_cleanup(&c); 184*0Sstevel@tonic-gate } 185*0Sstevel@tonic-gate #else /* !OPENSSL_NO_SSL2 */ 186*0Sstevel@tonic-gate 187*0Sstevel@tonic-gate # if PEDANTIC 188*0Sstevel@tonic-gate static void *dummy=&dummy; 189*0Sstevel@tonic-gate # endif 190*0Sstevel@tonic-gate 191*0Sstevel@tonic-gate #endif 192