1/* crypto/evp/e_rc2.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
62#ifndef OPENSSL_NO_RC2
63
64#include <openssl/evp.h>
65#include <openssl/objects.h>
66#include "evp_locl.h"
67#include <openssl/rc2.h>
68
69static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
70			const unsigned char *iv,int enc);
71static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
72static int rc2_magic_to_meth(int i);
73static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
75static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
76
77typedef struct
78	{
79	int key_bits;	/* effective key bits */
80	RC2_KEY ks;	/* key schedule */
81	} EVP_RC2_KEY;
82
83#define data(ctx)	((EVP_RC2_KEY *)(ctx)->cipher_data)
84
85IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
86			8,
87			RC2_KEY_LENGTH, 8, 64,
88			EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
89			rc2_init_key, NULL,
90			rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
91			rc2_ctrl)
92
93#define RC2_40_MAGIC	0xa0
94#define RC2_64_MAGIC	0x78
95#define RC2_128_MAGIC	0x3a
96
97static const EVP_CIPHER r2_64_cbc_cipher=
98	{
99	NID_rc2_64_cbc,
100	8,8 /* 64 bit */,8,
101	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
102	rc2_init_key,
103	rc2_cbc_cipher,
104	NULL,
105	sizeof(EVP_RC2_KEY),
106	rc2_set_asn1_type_and_iv,
107	rc2_get_asn1_type_and_iv,
108	rc2_ctrl,
109	NULL
110	};
111
112static const EVP_CIPHER r2_40_cbc_cipher=
113	{
114	NID_rc2_40_cbc,
115	8,5 /* 40 bit */,8,
116	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
117	rc2_init_key,
118	rc2_cbc_cipher,
119	NULL,
120	sizeof(EVP_RC2_KEY),
121	rc2_set_asn1_type_and_iv,
122	rc2_get_asn1_type_and_iv,
123	rc2_ctrl,
124	NULL
125	};
126
127const EVP_CIPHER *EVP_rc2_64_cbc(void)
128	{
129	return(&r2_64_cbc_cipher);
130	}
131
132const EVP_CIPHER *EVP_rc2_40_cbc(void)
133	{
134	return(&r2_40_cbc_cipher);
135	}
136
137static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
138			const unsigned char *iv, int enc)
139	{
140	RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
141		    key,data(ctx)->key_bits);
142	return 1;
143	}
144
145static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
146	{
147	int i;
148
149	EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
150	if 	(i == 128) return(RC2_128_MAGIC);
151	else if (i == 64)  return(RC2_64_MAGIC);
152	else if (i == 40)  return(RC2_40_MAGIC);
153	else return(0);
154	}
155
156static int rc2_magic_to_meth(int i)
157	{
158	if      (i == RC2_128_MAGIC) return 128;
159	else if (i == RC2_64_MAGIC)  return 64;
160	else if (i == RC2_40_MAGIC)  return 40;
161	else
162		{
163		EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
164		return(0);
165		}
166	}
167
168static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
169	{
170	long num=0;
171	int i=0;
172	int key_bits;
173	unsigned int l;
174	unsigned char iv[EVP_MAX_IV_LENGTH];
175
176	if (type != NULL)
177		{
178		l=EVP_CIPHER_CTX_iv_length(c);
179		OPENSSL_assert(l <= sizeof(iv));
180		i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
181		if (i != (int)l)
182			return(-1);
183		key_bits =rc2_magic_to_meth((int)num);
184		if (!key_bits)
185			return(-1);
186		if(i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
187			return -1;
188		EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
189		EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
190		}
191	return(i);
192	}
193
194static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
195	{
196	long num;
197	int i=0,j;
198
199	if (type != NULL)
200		{
201		num=rc2_meth_to_magic(c);
202		j=EVP_CIPHER_CTX_iv_length(c);
203		i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
204		}
205	return(i);
206	}
207
208static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
209	{
210	switch(type)
211		{
212	case EVP_CTRL_INIT:
213		data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
214		return 1;
215
216	case EVP_CTRL_GET_RC2_KEY_BITS:
217		*(int *)ptr = data(c)->key_bits;
218		return 1;
219
220	case EVP_CTRL_SET_RC2_KEY_BITS:
221		if(arg > 0)
222			{
223			data(c)->key_bits = arg;
224			return 1;
225			}
226		return 0;
227#ifdef PBE_PRF_TEST
228	case EVP_CTRL_PBE_PRF_NID:
229		*(int *)ptr = NID_hmacWithMD5;
230		return 1;
231#endif
232
233	default:
234		return -1;
235		}
236	}
237
238#endif
239