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194 lines
6.1 KiB
194 lines
6.1 KiB
14 years ago
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/* ssl/s2_enc.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "ssl_locl.h"
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#ifndef OPENSSL_NO_SSL2
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#include <stdio.h>
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int ssl2_enc_init(SSL *s, int client)
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{
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/* Max number of bytes needed */
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EVP_CIPHER_CTX *rs,*ws;
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const EVP_CIPHER *c;
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const EVP_MD *md;
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int num;
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if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
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{
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ssl2_return_error(s,SSL2_PE_NO_CIPHER);
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SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
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return(0);
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}
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ssl_replace_hash(&s->read_hash,md);
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ssl_replace_hash(&s->write_hash,md);
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if ((s->enc_read_ctx == NULL) &&
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((s->enc_read_ctx=(EVP_CIPHER_CTX *)
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OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
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goto err;
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/* make sure it's intialized in case the malloc for enc_write_ctx fails
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* and we exit with an error */
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rs= s->enc_read_ctx;
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EVP_CIPHER_CTX_init(rs);
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if ((s->enc_write_ctx == NULL) &&
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((s->enc_write_ctx=(EVP_CIPHER_CTX *)
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OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
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goto err;
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ws= s->enc_write_ctx;
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EVP_CIPHER_CTX_init(ws);
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num=c->key_len;
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s->s2->key_material_length=num*2;
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OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material);
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if (ssl2_generate_key_material(s) <= 0)
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return 0;
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OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg));
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EVP_EncryptInit_ex(ws,c,NULL,&(s->s2->key_material[(client)?num:0]),
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s->session->key_arg);
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EVP_DecryptInit_ex(rs,c,NULL,&(s->s2->key_material[(client)?0:num]),
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s->session->key_arg);
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s->s2->read_key= &(s->s2->key_material[(client)?0:num]);
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s->s2->write_key= &(s->s2->key_material[(client)?num:0]);
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return(1);
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err:
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SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE);
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return(0);
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}
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/* read/writes from s->s2->mac_data using length for encrypt and
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* decrypt. It sets s->s2->padding and s->[rw]length
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* if we are encrypting */
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void ssl2_enc(SSL *s, int send)
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{
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EVP_CIPHER_CTX *ds;
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unsigned long l;
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int bs;
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if (send)
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{
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ds=s->enc_write_ctx;
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l=s->s2->wlength;
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}
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else
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{
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ds=s->enc_read_ctx;
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l=s->s2->rlength;
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}
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/* check for NULL cipher */
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if (ds == NULL) return;
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bs=ds->cipher->block_size;
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/* This should be using (bs-1) and bs instead of 7 and 8, but
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* what the hell. */
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if (bs == 8)
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l=(l+7)/8*8;
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EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l);
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}
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void ssl2_mac(SSL *s, unsigned char *md, int send)
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{
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EVP_MD_CTX c;
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unsigned char sequence[4],*p,*sec,*act;
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unsigned long seq;
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unsigned int len;
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if (send)
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{
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seq=s->s2->write_sequence;
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sec=s->s2->write_key;
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len=s->s2->wact_data_length;
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act=s->s2->wact_data;
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}
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else
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{
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seq=s->s2->read_sequence;
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sec=s->s2->read_key;
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len=s->s2->ract_data_length;
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act=s->s2->ract_data;
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}
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p= &(sequence[0]);
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l2n(seq,p);
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/* There has to be a MAC algorithm. */
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EVP_MD_CTX_init(&c);
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EVP_MD_CTX_copy(&c, s->read_hash);
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EVP_DigestUpdate(&c,sec,
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EVP_CIPHER_CTX_key_length(s->enc_read_ctx));
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EVP_DigestUpdate(&c,act,len);
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/* the above line also does the pad data */
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EVP_DigestUpdate(&c,sequence,4);
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EVP_DigestFinal_ex(&c,md,NULL);
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EVP_MD_CTX_cleanup(&c);
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}
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#else /* !OPENSSL_NO_SSL2 */
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# if PEDANTIC
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static void *dummy=&dummy;
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# endif
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#endif
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