VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/libzip/zip_crypto_openssl.c
blob: 7f1da10edbe2e45791201d26ef209df813497466 (plain)
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/*
  zip_crypto_openssl.c -- OpenSSL wrapper.
  Copyright (C) 2018-2021 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.
  3. The names of the authors may not be used to endorse or promote
  products derived from this software without specific prior
  written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdlib.h>

#include "zipint.h"

#include "zip_crypto.h"

#include <limits.h>
#include <openssl/rand.h>

#ifdef USE_OPENSSL_3_API
static _zip_crypto_hmac_t* hmac_new() {
    _zip_crypto_hmac_t *hmac = (_zip_crypto_hmac_t*)malloc(sizeof(*hmac));
    if (hmac != NULL) {
        hmac->mac = NULL;
        hmac->ctx = NULL;
    }
    return hmac;
}
static void hmac_free(_zip_crypto_hmac_t* hmac) {
    if (hmac != NULL) {
        if (hmac->ctx != NULL) {
            EVP_MAC_CTX_free(hmac->ctx);
        }
        if (hmac->mac != NULL) {
            EVP_MAC_free(hmac->mac);
        }
        free(hmac);
    }
}
#endif

_zip_crypto_aes_t *
_zip_crypto_aes_new(const zip_uint8_t *key, zip_uint16_t key_size, zip_error_t *error) {
    _zip_crypto_aes_t *aes;
    const EVP_CIPHER* cipher_type;

    switch (key_size) {
    case 128:
        cipher_type = EVP_aes_128_ecb();
        break;
    case 192:
        cipher_type = EVP_aes_192_ecb();
        break;
    case 256:
        cipher_type = EVP_aes_256_ecb();
        break;
    default:
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }

#ifdef USE_OPENSSL_1_0_API
    if ((aes = (_zip_crypto_aes_t *)malloc(sizeof(*aes))) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }
    memset(aes, 0, sizeof(*aes));
#else
    if ((aes = EVP_CIPHER_CTX_new()) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }
#endif

    if (EVP_EncryptInit_ex(aes, cipher_type, NULL, key, NULL) != 1) {
#ifdef USE_OPENSSL_1_0_API
        free(aes);
#else
        EVP_CIPHER_CTX_free(aes);
#endif
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }

    return aes;
}

void
_zip_crypto_aes_free(_zip_crypto_aes_t *aes) {
    if (aes == NULL) {
        return;
    }

#ifdef USE_OPENSSL_1_0_API
    EVP_CIPHER_CTX_cleanup(aes);
    _zip_crypto_clear(aes, sizeof(*aes));
    free(aes);
#else
    EVP_CIPHER_CTX_free(aes);
#endif
}


bool
_zip_crypto_aes_encrypt_block(_zip_crypto_aes_t *aes, const zip_uint8_t *in, zip_uint8_t *out) {
    int len;
    if (EVP_EncryptUpdate(aes, out, &len, in, ZIP_CRYPTO_AES_BLOCK_LENGTH) != 1) {
        return false;
    }
    return true;
}


_zip_crypto_hmac_t *
_zip_crypto_hmac_new(const zip_uint8_t *secret, zip_uint64_t secret_length, zip_error_t *error) {
    _zip_crypto_hmac_t *hmac;

    if (secret_length > INT_MAX) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

#ifdef USE_OPENSSL_3_API
    if ((hmac = hmac_new()) == NULL
        || (hmac->mac = EVP_MAC_fetch(NULL, "HMAC", "provider=default")) == NULL
        || (hmac->ctx = EVP_MAC_CTX_new(hmac->mac)) == NULL) {
        hmac_free(hmac);
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    {
        OSSL_PARAM params[2];
        params[0] = OSSL_PARAM_construct_utf8_string("digest", "SHA1", 0);
        params[1] = OSSL_PARAM_construct_end();

        if (!EVP_MAC_init(hmac->ctx, (const unsigned char *)secret, secret_length, params)) {
            zip_error_set(error, ZIP_ER_INTERNAL, 0);
            hmac_free(hmac);
            return NULL;
        }
    }
#else
#ifdef USE_OPENSSL_1_0_API
    if ((hmac = (_zip_crypto_hmac_t *)malloc(sizeof(*hmac))) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

        HMAC_CTX_init(hmac);
#else
    if ((hmac = HMAC_CTX_new()) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }
#endif

    if (HMAC_Init_ex(hmac, secret, (int)secret_length, EVP_sha1(), NULL) != 1) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
#ifdef USE_OPENSSL_1_0_API
        free(hmac);
#else
        HMAC_CTX_free(hmac);
#endif
        return NULL;
    }
#endif

    return hmac;
}


void
_zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac) {
    if (hmac == NULL) {
        return;
    }

#if defined(USE_OPENSSL_3_API)
    hmac_free(hmac);
#elif defined(USE_OPENSSL_1_0_API)
    HMAC_CTX_cleanup(hmac);
    _zip_crypto_clear(hmac, sizeof(*hmac));
    free(hmac);
#else
    HMAC_CTX_free(hmac);
#endif
}


bool
_zip_crypto_hmac_output(_zip_crypto_hmac_t *hmac, zip_uint8_t *data) {
#ifdef USE_OPENSSL_3_API
    size_t length;
    return EVP_MAC_final(hmac->ctx, data, &length, ZIP_CRYPTO_SHA1_LENGTH) == 1 && length == ZIP_CRYPTO_SHA1_LENGTH;
#else
    unsigned int length;
    return HMAC_Final(hmac, data, &length) == 1;
#endif
}


ZIP_EXTERN bool
zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
    return RAND_bytes(buffer, length) == 1;
}