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