1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
59 #include "internal/cryptlib.h"
61 #ifndef OPENSSL_NO_RC2
63 # include <openssl/evp.h>
64 # include <openssl/objects.h>
65 # include "internal/evp_int.h"
66 # include <openssl/rc2.h>
68 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69 const unsigned char *iv, int enc);
70 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
71 static int rc2_magic_to_meth(int i);
72 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
73 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
74 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
77 int key_bits; /* effective key bits */
78 RC2_KEY ks; /* key schedule */
81 # define data(ctx) EVP_C_DATA(EVP_RC2_KEY,ctx)
83 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
85 RC2_KEY_LENGTH, 8, 64,
86 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
88 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
90 # define RC2_40_MAGIC 0xa0
91 # define RC2_64_MAGIC 0x78
92 # define RC2_128_MAGIC 0x3a
93 static const EVP_CIPHER r2_64_cbc_cipher = {
95 8, 8 /* 64 bit */ , 8,
96 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
101 rc2_set_asn1_type_and_iv,
102 rc2_get_asn1_type_and_iv,
107 static const EVP_CIPHER r2_40_cbc_cipher = {
109 8, 5 /* 40 bit */ , 8,
110 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
115 rc2_set_asn1_type_and_iv,
116 rc2_get_asn1_type_and_iv,
121 const EVP_CIPHER *EVP_rc2_64_cbc(void)
123 return (&r2_64_cbc_cipher);
126 const EVP_CIPHER *EVP_rc2_40_cbc(void)
128 return (&r2_40_cbc_cipher);
131 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
132 const unsigned char *iv, int enc)
134 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
135 key, data(ctx)->key_bits);
139 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
143 EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
145 return (RC2_128_MAGIC);
147 return (RC2_64_MAGIC);
149 return (RC2_40_MAGIC);
154 static int rc2_magic_to_meth(int i)
156 if (i == RC2_128_MAGIC)
158 else if (i == RC2_64_MAGIC)
160 else if (i == RC2_40_MAGIC)
163 EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
168 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
174 unsigned char iv[EVP_MAX_IV_LENGTH];
177 l = EVP_CIPHER_CTX_iv_length(c);
178 OPENSSL_assert(l <= sizeof(iv));
179 i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
182 key_bits = rc2_magic_to_meth((int)num);
185 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
187 EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits, NULL);
188 EVP_CIPHER_CTX_set_key_length(c, key_bits / 8);
193 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
199 num = rc2_meth_to_magic(c);
200 j = EVP_CIPHER_CTX_iv_length(c);
201 i = ASN1_TYPE_set_int_octetstring(type, num,
202 (unsigned char *)EVP_CIPHER_CTX_original_iv(c),
208 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
212 data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
215 case EVP_CTRL_GET_RC2_KEY_BITS:
216 *(int *)ptr = data(c)->key_bits;
219 case EVP_CTRL_SET_RC2_KEY_BITS:
221 data(c)->key_bits = arg;
226 case EVP_CTRL_PBE_PRF_NID:
227 *(int *)ptr = NID_hmacWithMD5;