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