1 /* crypto/evp/e_rc2.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 #ifndef OPENSSL_NO_RC2
64 # include <openssl/evp.h>
65 # include <openssl/objects.h>
66 # include "evp_locl.h"
67 # include <openssl/rc2.h>
69 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
70 const unsigned char *iv, int enc);
71 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
72 static int rc2_magic_to_meth(int i);
73 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
75 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
78 int key_bits; /* effective key bits */
79 RC2_KEY ks; /* key schedule */
82 # define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)
84 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
86 RC2_KEY_LENGTH, 8, 64,
87 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
89 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
91 # define RC2_40_MAGIC 0xa0
92 # define RC2_64_MAGIC 0x78
93 # define RC2_128_MAGIC 0x3a
94 static const EVP_CIPHER r2_64_cbc_cipher = {
96 8, 8 /* 64 bit */ , 8,
97 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
102 rc2_set_asn1_type_and_iv,
103 rc2_get_asn1_type_and_iv,
108 static const EVP_CIPHER r2_40_cbc_cipher = {
110 8, 5 /* 40 bit */ , 8,
111 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
116 rc2_set_asn1_type_and_iv,
117 rc2_get_asn1_type_and_iv,
122 const EVP_CIPHER *EVP_rc2_64_cbc(void)
124 return (&r2_64_cbc_cipher);
127 const EVP_CIPHER *EVP_rc2_40_cbc(void)
129 return (&r2_40_cbc_cipher);
132 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
133 const unsigned char *iv, int enc)
135 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
136 key, data(ctx)->key_bits);
140 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
144 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
146 return (RC2_128_MAGIC);
148 return (RC2_64_MAGIC);
150 return (RC2_40_MAGIC);
155 static int rc2_magic_to_meth(int i)
157 if (i == RC2_128_MAGIC)
159 else if (i == RC2_64_MAGIC)
161 else if (i == RC2_40_MAGIC)
164 EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
169 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
175 unsigned char iv[EVP_MAX_IV_LENGTH];
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);
183 key_bits = rc2_magic_to_meth((int)num);
186 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -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);
194 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
200 num = rc2_meth_to_magic(c);
201 j = EVP_CIPHER_CTX_iv_length(c);
202 i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
207 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
211 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
214 case EVP_CTRL_GET_RC2_KEY_BITS:
215 *(int *)ptr = data(c)->key_bits;
218 case EVP_CTRL_SET_RC2_KEY_BITS:
220 data(c)->key_bits = arg;
225 case EVP_CTRL_PBE_PRF_NID:
226 *(int *)ptr = NID_hmacWithMD5;