Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/evp/e_des.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 <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | #ifndef OPENSSL_NO_DES |
| 62 | #include <openssl/evp.h> |
| 63 | #include <openssl/objects.h> |
| 64 | #include "evp_locl.h" |
| 65 | #include <openssl/des.h> |
| 66 | #include <openssl/rand.h> |
| 67 | |
| 68 | static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
| 69 | const unsigned char *iv, int enc); |
| 70 | static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); |
| 71 | |
| 72 | /* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */ |
| 73 | |
| 74 | static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 75 | const unsigned char *in, size_t inl) |
| 76 | { |
| 77 | BLOCK_CIPHER_ecb_loop() |
| 78 | DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt); |
| 79 | return 1; |
| 80 | } |
| 81 | |
| 82 | static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 83 | const unsigned char *in, size_t inl) |
| 84 | { |
| 85 | while(inl>=EVP_MAXCHUNK) |
| 86 | { |
| 87 | DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, |
| 88 | (DES_cblock *)ctx->iv, &ctx->num); |
| 89 | inl-=EVP_MAXCHUNK; |
| 90 | in +=EVP_MAXCHUNK; |
| 91 | out+=EVP_MAXCHUNK; |
| 92 | } |
| 93 | if (inl) |
| 94 | DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, |
| 95 | (DES_cblock *)ctx->iv, &ctx->num); |
| 96 | return 1; |
| 97 | } |
| 98 | |
| 99 | static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 100 | const unsigned char *in, size_t inl) |
| 101 | { |
| 102 | while(inl>=EVP_MAXCHUNK) |
| 103 | { |
| 104 | DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data, |
| 105 | (DES_cblock *)ctx->iv, ctx->encrypt); |
| 106 | inl-=EVP_MAXCHUNK; |
| 107 | in +=EVP_MAXCHUNK; |
| 108 | out+=EVP_MAXCHUNK; |
| 109 | } |
| 110 | if (inl) |
| 111 | DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data, |
| 112 | (DES_cblock *)ctx->iv, ctx->encrypt); |
| 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 117 | const unsigned char *in, size_t inl) |
| 118 | { |
| 119 | while(inl>=EVP_MAXCHUNK) |
| 120 | { |
| 121 | DES_cfb64_encrypt(in,out, (long)EVP_MAXCHUNK, ctx->cipher_data, |
| 122 | (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); |
| 123 | inl-=EVP_MAXCHUNK; |
| 124 | in +=EVP_MAXCHUNK; |
| 125 | out+=EVP_MAXCHUNK; |
| 126 | } |
| 127 | if (inl) |
| 128 | DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data, |
| 129 | (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt); |
| 130 | return 1; |
| 131 | } |
| 132 | |
| 133 | /* Although we have a CFB-r implementation for DES, it doesn't pack the right |
| 134 | way, so wrap it here */ |
| 135 | static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 136 | const unsigned char *in, size_t inl) |
| 137 | { |
| 138 | size_t n,chunk=EVP_MAXCHUNK/8; |
| 139 | unsigned char c[1],d[1]; |
| 140 | |
| 141 | if (inl<chunk) chunk=inl; |
| 142 | |
| 143 | while (inl && inl>=chunk) |
| 144 | { |
| 145 | for(n=0 ; n < chunk*8; ++n) |
| 146 | { |
| 147 | c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; |
| 148 | DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv, |
| 149 | ctx->encrypt); |
| 150 | out[n/8]=(out[n/8]&~(0x80 >> (unsigned int)(n%8))) | |
| 151 | ((d[0]&0x80) >> (unsigned int)(n%8)); |
| 152 | } |
| 153 | inl-=chunk; |
| 154 | in +=chunk; |
| 155 | out+=chunk; |
| 156 | if (inl<chunk) chunk=inl; |
| 157 | } |
| 158 | |
| 159 | return 1; |
| 160 | } |
| 161 | |
| 162 | static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| 163 | const unsigned char *in, size_t inl) |
| 164 | { |
| 165 | while (inl>=EVP_MAXCHUNK) |
| 166 | { |
| 167 | DES_cfb_encrypt(in,out,8,(long)EVP_MAXCHUNK,ctx->cipher_data, |
| 168 | (DES_cblock *)ctx->iv,ctx->encrypt); |
| 169 | inl-=EVP_MAXCHUNK; |
| 170 | in +=EVP_MAXCHUNK; |
| 171 | out+=EVP_MAXCHUNK; |
| 172 | } |
| 173 | if (inl) |
| 174 | DES_cfb_encrypt(in,out,8,(long)inl,ctx->cipher_data, |
| 175 | (DES_cblock *)ctx->iv,ctx->encrypt); |
| 176 | return 1; |
| 177 | } |
| 178 | |
| 179 | BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64, |
| 180 | EVP_CIPH_RAND_KEY, des_init_key, NULL, |
| 181 | EVP_CIPHER_set_asn1_iv, |
| 182 | EVP_CIPHER_get_asn1_iv, |
| 183 | des_ctrl) |
| 184 | |
| 185 | BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1, |
| 186 | EVP_CIPH_RAND_KEY, des_init_key,NULL, |
| 187 | EVP_CIPHER_set_asn1_iv, |
| 188 | EVP_CIPHER_get_asn1_iv,des_ctrl) |
| 189 | |
| 190 | BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8, |
| 191 | EVP_CIPH_RAND_KEY,des_init_key,NULL, |
| 192 | EVP_CIPHER_set_asn1_iv, |
| 193 | EVP_CIPHER_get_asn1_iv,des_ctrl) |
| 194 | |
| 195 | static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
| 196 | const unsigned char *iv, int enc) |
| 197 | { |
| 198 | DES_cblock *deskey = (DES_cblock *)key; |
| 199 | #ifdef EVP_CHECK_DES_KEY |
| 200 | if(DES_set_key_checked(deskey,ctx->cipher_data) != 0) |
| 201 | return 0; |
| 202 | #else |
| 203 | DES_set_key_unchecked(deskey,ctx->cipher_data); |
| 204 | #endif |
| 205 | return 1; |
| 206 | } |
| 207 | |
| 208 | static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) |
| 209 | { |
| 210 | |
| 211 | switch(type) |
| 212 | { |
| 213 | case EVP_CTRL_RAND_KEY: |
| 214 | if (RAND_bytes(ptr, 8) <= 0) |
| 215 | return 0; |
| 216 | DES_set_odd_parity((DES_cblock *)ptr); |
| 217 | return 1; |
| 218 | |
| 219 | default: |
| 220 | return -1; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | #endif |