aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/evp/e_rc2.c
blob: aa0d1401868782fb9aee1a194ce5ac067014a4ce (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_RC2

# include <openssl/evp.h>
# include <openssl/objects.h>
# include "internal/evp_int.h"
# include <openssl/rc2.h>

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc);
static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);
static int rc2_magic_to_meth(int i);
static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct {
    int key_bits;               /* effective key bits */
    RC2_KEY ks;                 /* key schedule */
} EVP_RC2_KEY;

# define data(ctx)       EVP_C_DATA(EVP_RC2_KEY,ctx)

IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,
                       8,
                       RC2_KEY_LENGTH, 8, 64,
                       EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
                       rc2_init_key, NULL,
                       rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,
                       rc2_ctrl)
# define RC2_40_MAGIC    0xa0
# define RC2_64_MAGIC    0x78
# define RC2_128_MAGIC   0x3a
static const EVP_CIPHER r2_64_cbc_cipher = {
    NID_rc2_64_cbc,
    8, 8 /* 64 bit */ , 8,
    EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
    rc2_init_key,
    rc2_cbc_cipher,
    NULL,
    sizeof(EVP_RC2_KEY),
    rc2_set_asn1_type_and_iv,
    rc2_get_asn1_type_and_iv,
    rc2_ctrl,
    NULL
};

static const EVP_CIPHER r2_40_cbc_cipher = {
    NID_rc2_40_cbc,
    8, 5 /* 40 bit */ , 8,
    EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
    rc2_init_key,
    rc2_cbc_cipher,
    NULL,
    sizeof(EVP_RC2_KEY),
    rc2_set_asn1_type_and_iv,
    rc2_get_asn1_type_and_iv,
    rc2_ctrl,
    NULL
};

const EVP_CIPHER *EVP_rc2_64_cbc(void)
{
    return &r2_64_cbc_cipher;
}

const EVP_CIPHER *EVP_rc2_40_cbc(void)
{
    return &r2_40_cbc_cipher;
}

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
{
    RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
                key, data(ctx)->key_bits);
    return 1;
}

static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)
{
    int i;

    if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
        return 0;
    if (i == 128)
        return RC2_128_MAGIC;
    else if (i == 64)
        return RC2_64_MAGIC;
    else if (i == 40)
        return RC2_40_MAGIC;
    else
        return 0;
}

static int rc2_magic_to_meth(int i)
{
    if (i == RC2_128_MAGIC)
        return 128;
    else if (i == RC2_64_MAGIC)
        return 64;
    else if (i == RC2_40_MAGIC)
        return 40;
    else {
        EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);
        return 0;
    }
}

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
    long num = 0;
    int i = 0;
    int key_bits;
    unsigned int l;
    unsigned char iv[EVP_MAX_IV_LENGTH];

    if (type != NULL) {
        l = EVP_CIPHER_CTX_iv_length(c);
        OPENSSL_assert(l <= sizeof(iv));
        i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);
        if (i != (int)l)
            return -1;
        key_bits = rc2_magic_to_meth((int)num);
        if (!key_bits)
            return -1;
        if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
            return -1;
        if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,
                                NULL) <= 0
                || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)
            return -1;
    }
    return i;
}

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
    long num;
    int i = 0, j;

    if (type != NULL) {
        num = rc2_meth_to_magic(c);
        j = EVP_CIPHER_CTX_iv_length(c);
        i = ASN1_TYPE_set_int_octetstring(type, num,
                                          (unsigned char *)EVP_CIPHER_CTX_original_iv(c),
                                          j);
    }
    return i;
}

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
    switch (type) {
    case EVP_CTRL_INIT:
        data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;
        return 1;

    case EVP_CTRL_GET_RC2_KEY_BITS:
        *(int *)ptr = data(c)->key_bits;
        return 1;

    case EVP_CTRL_SET_RC2_KEY_BITS:
        if (arg > 0) {
            data(c)->key_bits = arg;
            return 1;
        }
        return 0;
# ifdef PBE_PRF_TEST
    case EVP_CTRL_PBE_PRF_NID:
        *(int *)ptr = NID_hmacWithMD5;
        return 1;
# endif

    default:
        return -1;
    }
}

#endif