Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ssl/s2_enc.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | |
| 59 | #include "ssl_locl.h" |
| 60 | #ifndef OPENSSL_NO_SSL2 |
| 61 | #include <stdio.h> |
| 62 | |
| 63 | int ssl2_enc_init(SSL *s, int client) |
| 64 | { |
| 65 | /* Max number of bytes needed */ |
| 66 | EVP_CIPHER_CTX *rs,*ws; |
| 67 | const EVP_CIPHER *c; |
| 68 | const EVP_MD *md; |
| 69 | int num; |
| 70 | |
| 71 | if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL)) |
| 72 | { |
| 73 | ssl2_return_error(s,SSL2_PE_NO_CIPHER); |
| 74 | SSLerr(SSL_F_SSL2_ENC_INIT,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); |
| 75 | return(0); |
| 76 | } |
| 77 | ssl_replace_hash(&s->read_hash,md); |
| 78 | ssl_replace_hash(&s->write_hash,md); |
| 79 | |
| 80 | if ((s->enc_read_ctx == NULL) && |
| 81 | ((s->enc_read_ctx=(EVP_CIPHER_CTX *) |
| 82 | OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) |
| 83 | goto err; |
| 84 | |
| 85 | /* make sure it's intialized in case the malloc for enc_write_ctx fails |
| 86 | * and we exit with an error */ |
| 87 | rs= s->enc_read_ctx; |
| 88 | EVP_CIPHER_CTX_init(rs); |
| 89 | |
| 90 | if ((s->enc_write_ctx == NULL) && |
| 91 | ((s->enc_write_ctx=(EVP_CIPHER_CTX *) |
| 92 | OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) |
| 93 | goto err; |
| 94 | |
| 95 | ws= s->enc_write_ctx; |
| 96 | EVP_CIPHER_CTX_init(ws); |
| 97 | |
| 98 | num=c->key_len; |
| 99 | s->s2->key_material_length=num*2; |
| 100 | OPENSSL_assert(s->s2->key_material_length <= sizeof s->s2->key_material); |
| 101 | |
| 102 | if (ssl2_generate_key_material(s) <= 0) |
| 103 | return 0; |
| 104 | |
| 105 | OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg)); |
| 106 | EVP_EncryptInit_ex(ws,c,NULL,&(s->s2->key_material[(client)?num:0]), |
| 107 | s->session->key_arg); |
| 108 | EVP_DecryptInit_ex(rs,c,NULL,&(s->s2->key_material[(client)?0:num]), |
| 109 | s->session->key_arg); |
| 110 | s->s2->read_key= &(s->s2->key_material[(client)?0:num]); |
| 111 | s->s2->write_key= &(s->s2->key_material[(client)?num:0]); |
| 112 | return(1); |
| 113 | err: |
| 114 | SSLerr(SSL_F_SSL2_ENC_INIT,ERR_R_MALLOC_FAILURE); |
| 115 | return(0); |
| 116 | } |
| 117 | |
| 118 | /* read/writes from s->s2->mac_data using length for encrypt and |
| 119 | * decrypt. It sets s->s2->padding and s->[rw]length |
| 120 | * if we are encrypting */ |
| 121 | void ssl2_enc(SSL *s, int send) |
| 122 | { |
| 123 | EVP_CIPHER_CTX *ds; |
| 124 | unsigned long l; |
| 125 | int bs; |
| 126 | |
| 127 | if (send) |
| 128 | { |
| 129 | ds=s->enc_write_ctx; |
| 130 | l=s->s2->wlength; |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | ds=s->enc_read_ctx; |
| 135 | l=s->s2->rlength; |
| 136 | } |
| 137 | |
| 138 | /* check for NULL cipher */ |
| 139 | if (ds == NULL) return; |
| 140 | |
| 141 | |
| 142 | bs=ds->cipher->block_size; |
| 143 | /* This should be using (bs-1) and bs instead of 7 and 8, but |
| 144 | * what the hell. */ |
| 145 | if (bs == 8) |
| 146 | l=(l+7)/8*8; |
| 147 | |
| 148 | EVP_Cipher(ds,s->s2->mac_data,s->s2->mac_data,l); |
| 149 | } |
| 150 | |
| 151 | void ssl2_mac(SSL *s, unsigned char *md, int send) |
| 152 | { |
| 153 | EVP_MD_CTX c; |
| 154 | unsigned char sequence[4],*p,*sec,*act; |
| 155 | unsigned long seq; |
| 156 | unsigned int len; |
| 157 | |
| 158 | if (send) |
| 159 | { |
| 160 | seq=s->s2->write_sequence; |
| 161 | sec=s->s2->write_key; |
| 162 | len=s->s2->wact_data_length; |
| 163 | act=s->s2->wact_data; |
| 164 | } |
| 165 | else |
| 166 | { |
| 167 | seq=s->s2->read_sequence; |
| 168 | sec=s->s2->read_key; |
| 169 | len=s->s2->ract_data_length; |
| 170 | act=s->s2->ract_data; |
| 171 | } |
| 172 | |
| 173 | p= &(sequence[0]); |
| 174 | l2n(seq,p); |
| 175 | |
| 176 | /* There has to be a MAC algorithm. */ |
| 177 | EVP_MD_CTX_init(&c); |
| 178 | EVP_MD_CTX_copy(&c, s->read_hash); |
| 179 | EVP_DigestUpdate(&c,sec, |
| 180 | EVP_CIPHER_CTX_key_length(s->enc_read_ctx)); |
| 181 | EVP_DigestUpdate(&c,act,len); |
| 182 | /* the above line also does the pad data */ |
| 183 | EVP_DigestUpdate(&c,sequence,4); |
| 184 | EVP_DigestFinal_ex(&c,md,NULL); |
| 185 | EVP_MD_CTX_cleanup(&c); |
| 186 | } |
| 187 | #else /* !OPENSSL_NO_SSL2 */ |
| 188 | |
| 189 | # if PEDANTIC |
| 190 | static void *dummy=&dummy; |
| 191 | # endif |
| 192 | |
| 193 | #endif |