155714Skris/* ssl/s2_enc.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8296341Sdelphij * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15296341Sdelphij * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22296341Sdelphij * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37296341Sdelphij * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40296341Sdelphij * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52296341Sdelphij * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5959194Skris#include "ssl_locl.h" 60110007Smarkm#ifndef OPENSSL_NO_SSL2 61296341Sdelphij# include <stdio.h> 6255714Skris 6355714Skrisint ssl2_enc_init(SSL *s, int client) 64296341Sdelphij{ 65296341Sdelphij /* Max number of bytes needed */ 66296341Sdelphij EVP_CIPHER_CTX *rs, *ws; 67296341Sdelphij const EVP_CIPHER *c; 68296341Sdelphij const EVP_MD *md; 69296341Sdelphij int num; 7055714Skris 71296341Sdelphij if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) { 72296341Sdelphij ssl2_return_error(s, SSL2_PE_NO_CIPHER); 73296341Sdelphij SSLerr(SSL_F_SSL2_ENC_INIT, SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 74296341Sdelphij return (0); 75296341Sdelphij } 76296341Sdelphij ssl_replace_hash(&s->read_hash, md); 77296341Sdelphij ssl_replace_hash(&s->write_hash, md); 7855714Skris 79296341Sdelphij if ((s->enc_read_ctx == NULL) && ((s->enc_read_ctx = (EVP_CIPHER_CTX *) 80296341Sdelphij OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) 81296341Sdelphij == NULL)) 82296341Sdelphij goto err; 83167615Ssimon 84296341Sdelphij /* 85296341Sdelphij * make sure it's intialized in case the malloc for enc_write_ctx fails 86296341Sdelphij * and we exit with an error 87296341Sdelphij */ 88296341Sdelphij rs = s->enc_read_ctx; 89296341Sdelphij EVP_CIPHER_CTX_init(rs); 90167615Ssimon 91296341Sdelphij if ((s->enc_write_ctx == NULL) && ((s->enc_write_ctx = (EVP_CIPHER_CTX *) 92296341Sdelphij OPENSSL_malloc(sizeof 93296341Sdelphij (EVP_CIPHER_CTX))) == 94296341Sdelphij NULL)) 95296341Sdelphij goto err; 9655714Skris 97296341Sdelphij ws = s->enc_write_ctx; 98296341Sdelphij EVP_CIPHER_CTX_init(ws); 9955714Skris 100296341Sdelphij num = c->key_len; 101296341Sdelphij s->s2->key_material_length = num * 2; 102296341Sdelphij OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); 10355714Skris 104296341Sdelphij if (ssl2_generate_key_material(s) <= 0) 105296341Sdelphij return 0; 10655714Skris 107296341Sdelphij OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg)); 108296341Sdelphij EVP_EncryptInit_ex(ws, c, NULL, 109296341Sdelphij &(s->s2->key_material[(client) ? num : 0]), 110296341Sdelphij s->session->key_arg); 111296341Sdelphij EVP_DecryptInit_ex(rs, c, NULL, 112296341Sdelphij &(s->s2->key_material[(client) ? 0 : num]), 113296341Sdelphij s->session->key_arg); 114296341Sdelphij s->s2->read_key = &(s->s2->key_material[(client) ? 0 : num]); 115296341Sdelphij s->s2->write_key = &(s->s2->key_material[(client) ? num : 0]); 116296341Sdelphij return (1); 117296341Sdelphij err: 118296341Sdelphij SSLerr(SSL_F_SSL2_ENC_INIT, ERR_R_MALLOC_FAILURE); 119296341Sdelphij return (0); 120296341Sdelphij} 12155714Skris 122296341Sdelphij/* 123296341Sdelphij * read/writes from s->s2->mac_data using length for encrypt and decrypt. 124296341Sdelphij * It sets s->s2->padding and s->[rw]length if we are encrypting Returns 0 on 125296341Sdelphij * error and 1 on success 126296341Sdelphij */ 127279264Sdelphijint ssl2_enc(SSL *s, int send) 128296341Sdelphij{ 129296341Sdelphij EVP_CIPHER_CTX *ds; 130296341Sdelphij unsigned long l; 131296341Sdelphij int bs; 13255714Skris 133296341Sdelphij if (send) { 134296341Sdelphij ds = s->enc_write_ctx; 135296341Sdelphij l = s->s2->wlength; 136296341Sdelphij } else { 137296341Sdelphij ds = s->enc_read_ctx; 138296341Sdelphij l = s->s2->rlength; 139296341Sdelphij } 14055714Skris 141296341Sdelphij /* check for NULL cipher */ 142296341Sdelphij if (ds == NULL) 143296341Sdelphij return 1; 14455714Skris 145296341Sdelphij bs = ds->cipher->block_size; 146296341Sdelphij /* 147296341Sdelphij * This should be using (bs-1) and bs instead of 7 and 8, but what the 148296341Sdelphij * hell. 149296341Sdelphij */ 150296341Sdelphij if (bs == 8) 151296341Sdelphij l = (l + 7) / 8 * 8; 15255714Skris 153296341Sdelphij if (EVP_Cipher(ds, s->s2->mac_data, s->s2->mac_data, l) < 1) 154296341Sdelphij return 0; 15555714Skris 156296341Sdelphij return 1; 157296341Sdelphij} 158279264Sdelphij 15955714Skrisvoid ssl2_mac(SSL *s, unsigned char *md, int send) 160296341Sdelphij{ 161296341Sdelphij EVP_MD_CTX c; 162296341Sdelphij unsigned char sequence[4], *p, *sec, *act; 163296341Sdelphij unsigned long seq; 164296341Sdelphij unsigned int len; 16555714Skris 166296341Sdelphij if (send) { 167296341Sdelphij seq = s->s2->write_sequence; 168296341Sdelphij sec = s->s2->write_key; 169296341Sdelphij len = s->s2->wact_data_length; 170296341Sdelphij act = s->s2->wact_data; 171296341Sdelphij } else { 172296341Sdelphij seq = s->s2->read_sequence; 173296341Sdelphij sec = s->s2->read_key; 174296341Sdelphij len = s->s2->ract_data_length; 175296341Sdelphij act = s->s2->ract_data; 176296341Sdelphij } 17755714Skris 178296341Sdelphij p = &(sequence[0]); 179296341Sdelphij l2n(seq, p); 18055714Skris 181296341Sdelphij /* There has to be a MAC algorithm. */ 182296341Sdelphij EVP_MD_CTX_init(&c); 183296341Sdelphij EVP_MD_CTX_copy(&c, s->read_hash); 184296341Sdelphij EVP_DigestUpdate(&c, sec, EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); 185296341Sdelphij EVP_DigestUpdate(&c, act, len); 186296341Sdelphij /* the above line also does the pad data */ 187296341Sdelphij EVP_DigestUpdate(&c, sequence, 4); 188296341Sdelphij EVP_DigestFinal_ex(&c, md, NULL); 189296341Sdelphij EVP_MD_CTX_cleanup(&c); 190296341Sdelphij} 191296341Sdelphij#else /* !OPENSSL_NO_SSL2 */ 19255714Skris 19359194Skris# if PEDANTIC 194296341Sdelphijstatic void *dummy = &dummy; 19559194Skris# endif 19659194Skris 19755949Skris#endif 198