198 lines
6.9 KiB
C
198 lines
6.9 KiB
C
/* 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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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) && ((s->enc_read_ctx = (EVP_CIPHER_CTX *)
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OPENSSL_malloc(sizeof(EVP_CIPHER_CTX)))
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== NULL))
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goto err;
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/*
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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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*/
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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) && ((s->enc_write_ctx = (EVP_CIPHER_CTX *)
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OPENSSL_malloc(sizeof
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(EVP_CIPHER_CTX))) ==
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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,
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&(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,
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&(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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/*
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* read/writes from s->s2->mac_data using length for encrypt and decrypt.
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* It sets s->s2->padding and s->[rw]length if we are encrypting Returns 0 on
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* error and 1 on success
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*/
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int 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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ds = s->enc_write_ctx;
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l = s->s2->wlength;
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} else {
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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)
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return 1;
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bs = ds->cipher->block_size;
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/*
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* This should be using (bs-1) and bs instead of 7 and 8, but what the
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* hell.
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*/
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if (bs == 8)
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l = (l + 7) / 8 * 8;
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if (EVP_Cipher(ds, s->s2->mac_data, s->s2->mac_data, l) < 1)
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return 0;
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return 1;
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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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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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} else {
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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, 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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