e_rc2.c revision 1.8 
1/* $OpenBSD: e_rc2.c,v 1.8 2014/06/12 15:49:29 deraadt Exp $ */
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	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	NID_rc2_64_cbc,
98	8, 8 /* 64 bit */, 8,
99	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
100	rc2_init_key,
101	rc2_cbc_cipher,
102	NULL,
103	sizeof(EVP_RC2_KEY),
104	rc2_set_asn1_type_and_iv,
105	rc2_get_asn1_type_and_iv,
106	rc2_ctrl,
107	NULL
108};
109
110static const EVP_CIPHER r2_40_cbc_cipher = {
111	NID_rc2_40_cbc,
112	8, 5 /* 40 bit */, 8,
113	EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
114	rc2_init_key,
115	rc2_cbc_cipher,
116	NULL,
117	sizeof(EVP_RC2_KEY),
118	rc2_set_asn1_type_and_iv,
119	rc2_get_asn1_type_and_iv,
120	rc2_ctrl,
121	NULL
122};
123
124const EVP_CIPHER *
125EVP_rc2_64_cbc(void)
126{
127	return (&r2_64_cbc_cipher);
128}
129
130const EVP_CIPHER *
131EVP_rc2_40_cbc(void)
132{
133	return (&r2_40_cbc_cipher);
134}
135
136static int
137rc2_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
146rc2_meth_to_magic(EVP_CIPHER_CTX *e)
147{
148	int i;
149
150	EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
151	if (i == 128)
152		return (RC2_128_MAGIC);
153	else if (i == 64)
154		return (RC2_64_MAGIC);
155	else if (i == 40)
156		return (RC2_40_MAGIC);
157	else
158		return (0);
159}
160
161static int
162rc2_magic_to_meth(int i)
163{
164	if (i == RC2_128_MAGIC)
165		return 128;
166	else if (i == RC2_64_MAGIC)
167		return 64;
168	else if (i == RC2_40_MAGIC)
169		return 40;
170	else {
171		EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
172		return (0);
173	}
174}
175
176static int
177rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
178{
179	long num = 0;
180	int i = 0;
181	int key_bits;
182	unsigned int l;
183	unsigned char iv[EVP_MAX_IV_LENGTH];
184
185	if (type != NULL) {
186		l = EVP_CIPHER_CTX_iv_length(c);
187		OPENSSL_assert(l <= sizeof(iv));
188		i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
189		if (i != (int)l)
190			return (-1);
191		key_bits = rc2_magic_to_meth((int)num);
192		if (!key_bits)
193			return (-1);
194		if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
195			return -1;
196		EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS,
197		    key_bits, NULL);
198		EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
199	}
200	return (i);
201}
202
203static int
204rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
205{
206	long num;
207	int i = 0, j;
208
209	if (type != NULL) {
210		num = rc2_meth_to_magic(c);
211		j = EVP_CIPHER_CTX_iv_length(c);
212		i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
213	}
214	return (i);
215}
216
217static int
218rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
219{
220	switch (type) {
221	case EVP_CTRL_INIT:
222		data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
223		return 1;
224
225	case EVP_CTRL_GET_RC2_KEY_BITS:
226		*(int *)ptr = data(c)->key_bits;
227		return 1;
228
229	case EVP_CTRL_SET_RC2_KEY_BITS:
230		if (arg > 0) {
231			data(c)->key_bits = arg;
232			return 1;
233		}
234		return 0;
235
236#ifdef PBE_PRF_TEST
237	case EVP_CTRL_PBE_PRF_NID:
238		*(int *)ptr = NID_hmacWithMD5;
239		return 1;
240#endif
241
242	default:
243		return -1;
244	}
245}
246
247#endif
248