e_rc2.c revision 109998 
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#ifndef OPENSSL_NO_RC2
60
61#include <stdio.h>
62#include "cryptlib.h"
63#include <openssl/evp.h>
64#include <openssl/objects.h>
65#include "evp_locl.h"
66#include <openssl/rc2.h>
67
68static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69			const unsigned char *iv,int enc);
70static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
71static int rc2_magic_to_meth(int i);
72static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
73static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
75
76typedef struct
77	{
78	int key_bits;	/* effective key bits */
79	RC2_KEY ks;	/* key schedule */
80	} EVP_RC2_KEY;
81
82#define data(ctx)	((EVP_RC2_KEY *)(ctx)->cipher_data)
83
84IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
85			8,
86			RC2_KEY_LENGTH, 8, 64,
87			EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
88			rc2_init_key, NULL,
89			rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
90			rc2_ctrl)
91
92#define RC2_40_MAGIC	0xa0
93#define RC2_64_MAGIC	0x78
94#define RC2_128_MAGIC	0x3a
95
96static const EVP_CIPHER r2_64_cbc_cipher=
97	{
98	NID_rc2_64_cbc,
99	8,8 /* 64 bit */,8,
100	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
101	rc2_init_key,
102	rc2_cbc_cipher,
103	NULL,
104	sizeof(EVP_RC2_KEY),
105	rc2_set_asn1_type_and_iv,
106	rc2_get_asn1_type_and_iv,
107	rc2_ctrl,
108	NULL
109	};
110
111static const EVP_CIPHER r2_40_cbc_cipher=
112	{
113	NID_rc2_40_cbc,
114	8,5 /* 40 bit */,8,
115	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
116	rc2_init_key,
117	rc2_cbc_cipher,
118	NULL,
119	sizeof(EVP_RC2_KEY),
120	rc2_set_asn1_type_and_iv,
121	rc2_get_asn1_type_and_iv,
122	rc2_ctrl,
123	NULL
124	};
125
126const EVP_CIPHER *EVP_rc2_64_cbc(void)
127	{
128	return(&r2_64_cbc_cipher);
129	}
130
131const EVP_CIPHER *EVP_rc2_40_cbc(void)
132	{
133	return(&r2_40_cbc_cipher);
134	}
135
136static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
137			const unsigned char *iv, int enc)
138	{
139	RC2_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
140		    key,data(ctx)->key_bits);
141	return 1;
142	}
143
144static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
145	{
146	int i;
147
148	EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
149	if 	(i == 128) return(RC2_128_MAGIC);
150	else if (i == 64)  return(RC2_64_MAGIC);
151	else if (i == 40)  return(RC2_40_MAGIC);
152	else return(0);
153	}
154
155static int rc2_magic_to_meth(int i)
156	{
157	if      (i == RC2_128_MAGIC) return 128;
158	else if (i == RC2_64_MAGIC)  return 64;
159	else if (i == RC2_40_MAGIC)  return 40;
160	else
161		{
162		EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE);
163		return(0);
164		}
165	}
166
167static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
168	{
169	long num=0;
170	int i=0,l;
171	int key_bits;
172	unsigned char iv[EVP_MAX_IV_LENGTH];
173
174	if (type != NULL)
175		{
176		l=EVP_CIPHER_CTX_iv_length(c);
177		OPENSSL_assert(l <= sizeof iv);
178		i=ASN1_TYPE_get_int_octetstring(type,&num,iv,l);
179		if (i != l)
180			return(-1);
181		key_bits =rc2_magic_to_meth((int)num);
182		if (!key_bits)
183			return(-1);
184		if(i > 0) EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1);
185		EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
186		EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
187		}
188	return(i);
189	}
190
191static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
192	{
193	long num;
194	int i=0,j;
195
196	if (type != NULL)
197		{
198		num=rc2_meth_to_magic(c);
199		j=EVP_CIPHER_CTX_iv_length(c);
200		i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j);
201		}
202	return(i);
203	}
204
205static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
206	{
207	switch(type)
208		{
209	case EVP_CTRL_INIT:
210		data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
211		return 1;
212
213	case EVP_CTRL_GET_RC2_KEY_BITS:
214		*(int *)ptr = data(c)->key_bits;
215		return 1;
216
217	case EVP_CTRL_SET_RC2_KEY_BITS:
218		if(arg > 0)
219			{
220			data(c)->key_bits = arg;
221			return 1;
222			}
223		return 0;
224
225	default:
226		return -1;
227		}
228	}
229
230#endif
231