168651Skris/* crypto/evp/e_rc2.c */ 268651Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 368651Skris * All rights reserved. 468651Skris * 568651Skris * This package is an SSL implementation written 668651Skris * by Eric Young (eay@cryptsoft.com). 768651Skris * The implementation was written so as to conform with Netscapes SSL. 8296465Sdelphij * 968651Skris * This library is free for commercial and non-commercial use as long as 1068651Skris * the following conditions are aheared to. The following conditions 1168651Skris * apply to all code found in this distribution, be it the RC4, RSA, 1268651Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1368651Skris * included with this distribution is covered by the same copyright terms 1468651Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15296465Sdelphij * 1668651Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1768651Skris * the code are not to be removed. 1868651Skris * If this package is used in a product, Eric Young should be given attribution 1968651Skris * as the author of the parts of the library used. 2068651Skris * This can be in the form of a textual message at program startup or 2168651Skris * in documentation (online or textual) provided with the package. 22296465Sdelphij * 2368651Skris * Redistribution and use in source and binary forms, with or without 2468651Skris * modification, are permitted provided that the following conditions 2568651Skris * are met: 2668651Skris * 1. Redistributions of source code must retain the copyright 2768651Skris * notice, this list of conditions and the following disclaimer. 2868651Skris * 2. Redistributions in binary form must reproduce the above copyright 2968651Skris * notice, this list of conditions and the following disclaimer in the 3068651Skris * documentation and/or other materials provided with the distribution. 3168651Skris * 3. All advertising materials mentioning features or use of this software 3268651Skris * must display the following acknowledgement: 3368651Skris * "This product includes cryptographic software written by 3468651Skris * Eric Young (eay@cryptsoft.com)" 3568651Skris * The word 'cryptographic' can be left out if the rouines from the library 3668651Skris * being used are not cryptographic related :-). 37296465Sdelphij * 4. If you include any Windows specific code (or a derivative thereof) from 3868651Skris * the apps directory (application code) you must include an acknowledgement: 3968651Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40296465Sdelphij * 4168651Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4268651Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4368651Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4468651Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4568651Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4668651Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4768651Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4868651Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4968651Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5068651Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5168651Skris * SUCH DAMAGE. 52296465Sdelphij * 5368651Skris * The licence and distribution terms for any publically available version or 5468651Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5568651Skris * copied and put under another distribution licence 5668651Skris * [including the GNU Public Licence.] 5768651Skris */ 5868651Skris 59160814Ssimon#include <stdio.h> 60160814Ssimon#include "cryptlib.h" 61160814Ssimon 62109998Smarkm#ifndef OPENSSL_NO_RC2 6368651Skris 64296465Sdelphij# include <openssl/evp.h> 65296465Sdelphij# include <openssl/objects.h> 66296465Sdelphij# include "evp_locl.h" 67296465Sdelphij# include <openssl/rc2.h> 6868651Skris 6968651Skrisstatic int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 70296465Sdelphij const unsigned char *iv, int enc); 7168651Skrisstatic int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx); 7268651Skrisstatic int rc2_magic_to_meth(int i); 7368651Skrisstatic int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 7468651Skrisstatic int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); 7568651Skrisstatic int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr); 7668651Skris 77296465Sdelphijtypedef struct { 78296465Sdelphij int key_bits; /* effective key bits */ 79296465Sdelphij RC2_KEY ks; /* key schedule */ 80296465Sdelphij} EVP_RC2_KEY; 81109998Smarkm 82296465Sdelphij# define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data) 83109998Smarkm 84109998SmarkmIMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2, 85296465Sdelphij 8, 86296465Sdelphij RC2_KEY_LENGTH, 8, 64, 87296465Sdelphij EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 88296465Sdelphij rc2_init_key, NULL, 89296465Sdelphij rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv, 90296465Sdelphij rc2_ctrl) 91296465Sdelphij# define RC2_40_MAGIC 0xa0 92296465Sdelphij# define RC2_64_MAGIC 0x78 93296465Sdelphij# define RC2_128_MAGIC 0x3a 94296465Sdelphijstatic const EVP_CIPHER r2_64_cbc_cipher = { 95296465Sdelphij NID_rc2_64_cbc, 96296465Sdelphij 8, 8 /* 64 bit */ , 8, 97296465Sdelphij EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 98296465Sdelphij rc2_init_key, 99296465Sdelphij rc2_cbc_cipher, 100296465Sdelphij NULL, 101296465Sdelphij sizeof(EVP_RC2_KEY), 102296465Sdelphij rc2_set_asn1_type_and_iv, 103296465Sdelphij rc2_get_asn1_type_and_iv, 104296465Sdelphij rc2_ctrl, 105296465Sdelphij NULL 106296465Sdelphij}; 10768651Skris 108296465Sdelphijstatic const EVP_CIPHER r2_40_cbc_cipher = { 109296465Sdelphij NID_rc2_40_cbc, 110296465Sdelphij 8, 5 /* 40 bit */ , 8, 111296465Sdelphij EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 112296465Sdelphij rc2_init_key, 113296465Sdelphij rc2_cbc_cipher, 114296465Sdelphij NULL, 115296465Sdelphij sizeof(EVP_RC2_KEY), 116296465Sdelphij rc2_set_asn1_type_and_iv, 117296465Sdelphij rc2_get_asn1_type_and_iv, 118296465Sdelphij rc2_ctrl, 119296465Sdelphij NULL 120296465Sdelphij}; 12168651Skris 122109998Smarkmconst EVP_CIPHER *EVP_rc2_64_cbc(void) 123296465Sdelphij{ 124296465Sdelphij return (&r2_64_cbc_cipher); 125296465Sdelphij} 12668651Skris 127109998Smarkmconst EVP_CIPHER *EVP_rc2_40_cbc(void) 128296465Sdelphij{ 129296465Sdelphij return (&r2_40_cbc_cipher); 130296465Sdelphij} 131296465Sdelphij 13268651Skrisstatic int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, 133296465Sdelphij const unsigned char *iv, int enc) 134296465Sdelphij{ 135296465Sdelphij RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), 136296465Sdelphij key, data(ctx)->key_bits); 137296465Sdelphij return 1; 138296465Sdelphij} 13968651Skris 14068651Skrisstatic int rc2_meth_to_magic(EVP_CIPHER_CTX *e) 141296465Sdelphij{ 142296465Sdelphij int i; 14368651Skris 144296465Sdelphij EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i); 145296465Sdelphij if (i == 128) 146296465Sdelphij return (RC2_128_MAGIC); 147296465Sdelphij else if (i == 64) 148296465Sdelphij return (RC2_64_MAGIC); 149296465Sdelphij else if (i == 40) 150296465Sdelphij return (RC2_40_MAGIC); 151296465Sdelphij else 152296465Sdelphij return (0); 153296465Sdelphij} 15468651Skris 15568651Skrisstatic int rc2_magic_to_meth(int i) 156296465Sdelphij{ 157296465Sdelphij if (i == RC2_128_MAGIC) 158296465Sdelphij return 128; 159296465Sdelphij else if (i == RC2_64_MAGIC) 160296465Sdelphij return 64; 161296465Sdelphij else if (i == RC2_40_MAGIC) 162296465Sdelphij return 40; 163296465Sdelphij else { 164296465Sdelphij EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE); 165296465Sdelphij return (0); 166296465Sdelphij } 167296465Sdelphij} 16868651Skris 16968651Skrisstatic int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 170296465Sdelphij{ 171296465Sdelphij long num = 0; 172296465Sdelphij int i = 0; 173296465Sdelphij int key_bits; 174296465Sdelphij unsigned int l; 175296465Sdelphij unsigned char iv[EVP_MAX_IV_LENGTH]; 17668651Skris 177296465Sdelphij if (type != NULL) { 178296465Sdelphij l = EVP_CIPHER_CTX_iv_length(c); 179296465Sdelphij OPENSSL_assert(l <= sizeof(iv)); 180296465Sdelphij i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l); 181296465Sdelphij if (i != (int)l) 182296465Sdelphij return (-1); 183296465Sdelphij key_bits = rc2_magic_to_meth((int)num); 184296465Sdelphij if (!key_bits) 185296465Sdelphij return (-1); 186296465Sdelphij if (i > 0) 187296465Sdelphij EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1); 188296465Sdelphij EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL); 189296465Sdelphij EVP_CIPHER_CTX_set_key_length(c, key_bits / 8); 190296465Sdelphij } 191296465Sdelphij return (i); 192296465Sdelphij} 19368651Skris 19468651Skrisstatic int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 195296465Sdelphij{ 196296465Sdelphij long num; 197296465Sdelphij int i = 0, j; 19868651Skris 199296465Sdelphij if (type != NULL) { 200296465Sdelphij num = rc2_meth_to_magic(c); 201296465Sdelphij j = EVP_CIPHER_CTX_iv_length(c); 202296465Sdelphij i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j); 203296465Sdelphij } 204296465Sdelphij return (i); 205296465Sdelphij} 20668651Skris 20768651Skrisstatic int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 208296465Sdelphij{ 209296465Sdelphij switch (type) { 210296465Sdelphij case EVP_CTRL_INIT: 211296465Sdelphij data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8; 212296465Sdelphij return 1; 21368651Skris 214296465Sdelphij case EVP_CTRL_GET_RC2_KEY_BITS: 215296465Sdelphij *(int *)ptr = data(c)->key_bits; 216296465Sdelphij return 1; 21768651Skris 218296465Sdelphij case EVP_CTRL_SET_RC2_KEY_BITS: 219296465Sdelphij if (arg > 0) { 220296465Sdelphij data(c)->key_bits = arg; 221296465Sdelphij return 1; 222296465Sdelphij } 223296465Sdelphij return 0; 22468651Skris 225296465Sdelphij default: 226296465Sdelphij return -1; 227296465Sdelphij } 228296465Sdelphij} 229296465Sdelphij 23068651Skris#endif 231