| /* 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 <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| # include <stdio.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| |
| 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 |