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
27static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
28                        const unsigned char *iv, int enc);
29static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
30static int rc2_magic_to_meth(int i);
31static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
32static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
33static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
34
35typedef 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
42IMPLEMENT_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
52static 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
67static 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
82const EVP_CIPHER *EVP_rc2_64_cbc(void)
83{
84    return &r2_64_cbc_cipher;
85}
86
87const EVP_CIPHER *EVP_rc2_40_cbc(void)
88{
89    return &r2_40_cbc_cipher;
90}
91
92static 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
100static 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
116static 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
130static 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
157static 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
170static 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