diff options
Diffstat (limited to 'openssl/ssl/s2_enc.c')
| -rw-r--r-- | openssl/ssl/s2_enc.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/openssl/ssl/s2_enc.c b/openssl/ssl/s2_enc.c new file mode 100644 index 0000000..23eef72 --- /dev/null +++ b/openssl/ssl/s2_enc.c @@ -0,0 +1,197 @@ +/* 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 |