1 /*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * RC2 low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdio.h>
17 #include "internal/cryptlib.h"
18
19 #ifndef OPENSSL_NO_RC2
20
21 # include <openssl/evp.h>
22 # include <openssl/objects.h>
23 # include "crypto/evp.h"
24 # include <openssl/rc2.h>
25 # include "evp_local.h"
26
27 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
28 const unsigned char *iv, int enc);
29 static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
30 static int rc2_magic_to_meth(int i);
31 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
32 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
33 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
34
35 typedef struct {
36 int key_bits; /* effective key bits */
37 RC2_KEY ks; /* key schedule */
38 } EVP_RC2_KEY;
39
40 # define data(ctx) EVP_C_DATA(EVP_RC2_KEY,ctx)
41
42 IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
43 8,
44 RC2_KEY_LENGTH, 8, 64,
45 EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
46 rc2_init_key, NULL,
47 rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
48 rc2_ctrl)
49 # define RC2_40_MAGIC 0xa0
50 # define RC2_64_MAGIC 0x78
51 # define RC2_128_MAGIC 0x3a
52 static const EVP_CIPHER r2_64_cbc_cipher = {
53 NID_rc2_64_cbc,
54 8, 8 /* 64 bit */ , 8,
55 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
56 EVP_ORIG_GLOBAL,
57 rc2_init_key,
58 rc2_cbc_cipher,
59 NULL,
60 sizeof(EVP_RC2_KEY),
61 rc2_set_asn1_type_and_iv,
62 rc2_get_asn1_type_and_iv,
63 rc2_ctrl,
64 NULL
65 };
66
67 static const EVP_CIPHER r2_40_cbc_cipher = {
68 NID_rc2_40_cbc,
69 8, 5 /* 40 bit */ , 8,
70 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
71 EVP_ORIG_GLOBAL,
72 rc2_init_key,
73 rc2_cbc_cipher,
74 NULL,
75 sizeof(EVP_RC2_KEY),
76 rc2_set_asn1_type_and_iv,
77 rc2_get_asn1_type_and_iv,
78 rc2_ctrl,
79 NULL
80 };
81
EVP_rc2_64_cbc(void)82 const EVP_CIPHER *EVP_rc2_64_cbc(void)
83 {
84 return &r2_64_cbc_cipher;
85 }
86
EVP_rc2_40_cbc(void)87 const EVP_CIPHER *EVP_rc2_40_cbc(void)
88 {
89 return &r2_40_cbc_cipher;
90 }
91
rc2_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)92 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
93 const unsigned char *iv, int enc)
94 {
95 RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_get_key_length(ctx),
96 key, data(ctx)->key_bits);
97 return 1;
98 }
99
rc2_meth_to_magic(EVP_CIPHER_CTX * e)100 static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
101 {
102 int i;
103
104 if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
105 return 0;
106 if (i == 128)
107 return RC2_128_MAGIC;
108 else if (i == 64)
109 return RC2_64_MAGIC;
110 else if (i == 40)
111 return RC2_40_MAGIC;
112 else
113 return 0;
114 }
115
rc2_magic_to_meth(int i)116 static int rc2_magic_to_meth(int i)
117 {
118 if (i == RC2_128_MAGIC)
119 return 128;
120 else if (i == RC2_64_MAGIC)
121 return 64;
122 else if (i == RC2_40_MAGIC)
123 return 40;
124 else {
125 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_SIZE);
126 return 0;
127 }
128 }
129
rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX * c,ASN1_TYPE * type)130 static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
131 {
132 long num = 0;
133 int i = 0;
134 int key_bits;
135 unsigned int l;
136 unsigned char iv[EVP_MAX_IV_LENGTH];
137
138 if (type != NULL) {
139 l = EVP_CIPHER_CTX_get_iv_length(c);
140 OPENSSL_assert(l <= sizeof(iv));
141 i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
142 if (i != (int)l)
143 return -1;
144 key_bits = rc2_magic_to_meth((int)num);
145 if (!key_bits)
146 return -1;
147 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
148 return -1;
149 if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
150 NULL) <= 0
151 || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
152 return -1;
153 }
154 return i;
155 }
156
rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX * c,ASN1_TYPE * type)157 static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
158 {
159 long num;
160 int i = 0, j;
161
162 if (type != NULL) {
163 num = rc2_meth_to_magic(c);
164 j = EVP_CIPHER_CTX_get_iv_length(c);
165 i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);
166 }
167 return i;
168 }
169
rc2_ctrl(EVP_CIPHER_CTX * c,int type,int arg,void * ptr)170 static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
171 {
172 switch (type) {
173 case EVP_CTRL_INIT:
174 data(c)->key_bits = EVP_CIPHER_CTX_get_key_length(c) * 8;
175 return 1;
176
177 case EVP_CTRL_GET_RC2_KEY_BITS:
178 *(int *)ptr = data(c)->key_bits;
179 return 1;
180
181 case EVP_CTRL_SET_RC2_KEY_BITS:
182 if (arg > 0) {
183 data(c)->key_bits = arg;
184 return 1;
185 }
186 return 0;
187 # ifdef PBE_PRF_TEST
188 case EVP_CTRL_PBE_PRF_NID:
189 *(int *)ptr = NID_hmacWithMD5;
190 return 1;
191 # endif
192
193 default:
194 return -1;
195 }
196 }
197
198 #endif
199