aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/openssl/crypto/asn1/p5_pbev2.c
blob: f91ba08f1ea4cbdf2f7938574458ce930617e34a (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
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
/*
 * Copyright 1999-2018 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"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/rand.h>

/* PKCS#5 v2.0 password based encryption structures */

ASN1_SEQUENCE(PBE2PARAM) = {
        ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
        ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
} ASN1_SEQUENCE_END(PBE2PARAM)

IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)

ASN1_SEQUENCE(PBKDF2PARAM) = {
        ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
        ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
        ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
        ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
} ASN1_SEQUENCE_END(PBKDF2PARAM)

IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)

/*
 * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
 * this is horrible! Extended version to allow application supplied PRF NID
 * and IV.
 */

X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
                              unsigned char *salt, int saltlen,
                              unsigned char *aiv, int prf_nid)
{
    X509_ALGOR *scheme = NULL, *ret = NULL;
    int alg_nid, keylen;
    EVP_CIPHER_CTX *ctx = NULL;
    unsigned char iv[EVP_MAX_IV_LENGTH];
    PBE2PARAM *pbe2 = NULL;

    alg_nid = EVP_CIPHER_type(cipher);
    if (alg_nid == NID_undef) {
        ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
                ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
        goto err;
    }

    if ((pbe2 = PBE2PARAM_new()) == NULL)
        goto merr;

    /* Setup the AlgorithmIdentifier for the encryption scheme */
    scheme = pbe2->encryption;
    scheme->algorithm = OBJ_nid2obj(alg_nid);
    if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
        goto merr;

    /* Create random IV */
    if (EVP_CIPHER_iv_length(cipher)) {
        if (aiv)
            memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
        else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) <= 0)
            goto err;
    }

    ctx = EVP_CIPHER_CTX_new();
    if (ctx == NULL)
        goto merr;

    /* Dummy cipherinit to just setup the IV, and PRF */
    if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
        goto err;
    if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
        ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
        goto err;
    }
    /*
     * If prf NID unspecified see if cipher has a preference. An error is OK
     * here: just means use default PRF.
     */
    if ((prf_nid == -1) &&
        EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
        ERR_clear_error();
        prf_nid = NID_hmacWithSHA256;
    }
    EVP_CIPHER_CTX_free(ctx);
    ctx = NULL;

    /* If its RC2 then we'd better setup the key length */

    if (alg_nid == NID_rc2_cbc)
        keylen = EVP_CIPHER_key_length(cipher);
    else
        keylen = -1;

    /* Setup keyfunc */

    X509_ALGOR_free(pbe2->keyfunc);

    pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);

    if (!pbe2->keyfunc)
        goto merr;

    /* Now set up top level AlgorithmIdentifier */

    if ((ret = X509_ALGOR_new()) == NULL)
        goto merr;

    ret->algorithm = OBJ_nid2obj(NID_pbes2);

    /* Encode PBE2PARAM into parameter */

    if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
                                 &ret->parameter))
         goto merr;

    PBE2PARAM_free(pbe2);
    pbe2 = NULL;

    return ret;

 merr:
    ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);

 err:
    EVP_CIPHER_CTX_free(ctx);
    PBE2PARAM_free(pbe2);
    /* Note 'scheme' is freed as part of pbe2 */
    X509_ALGOR_free(ret);

    return NULL;
}

X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
                           unsigned char *salt, int saltlen)
{
    return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
}

X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
                             int prf_nid, int keylen)
{
    X509_ALGOR *keyfunc = NULL;
    PBKDF2PARAM *kdf = NULL;
    ASN1_OCTET_STRING *osalt = NULL;

    if ((kdf = PBKDF2PARAM_new()) == NULL)
        goto merr;
    if ((osalt = ASN1_OCTET_STRING_new()) == NULL)
        goto merr;

    kdf->salt->value.octet_string = osalt;
    kdf->salt->type = V_ASN1_OCTET_STRING;

    if (saltlen == 0)
        saltlen = PKCS5_SALT_LEN;
    if ((osalt->data = OPENSSL_malloc(saltlen)) == NULL)
        goto merr;

    osalt->length = saltlen;

    if (salt)
        memcpy(osalt->data, salt, saltlen);
    else if (RAND_bytes(osalt->data, saltlen) <= 0)
        goto merr;

    if (iter <= 0)
        iter = PKCS5_DEFAULT_ITER;

    if (!ASN1_INTEGER_set(kdf->iter, iter))
        goto merr;

    /* If have a key len set it up */

    if (keylen > 0) {
        if ((kdf->keylength = ASN1_INTEGER_new()) == NULL)
            goto merr;
        if (!ASN1_INTEGER_set(kdf->keylength, keylen))
            goto merr;
    }

    /* prf can stay NULL if we are using hmacWithSHA1 */
    if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
        kdf->prf = X509_ALGOR_new();
        if (kdf->prf == NULL)
            goto merr;
        X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
    }

    /* Finally setup the keyfunc structure */

    keyfunc = X509_ALGOR_new();
    if (keyfunc == NULL)
        goto merr;

    keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);

    /* Encode PBKDF2PARAM into parameter of pbe2 */

    if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
                                 &keyfunc->parameter))
         goto merr;

    PBKDF2PARAM_free(kdf);
    return keyfunc;

 merr:
    ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE);
    PBKDF2PARAM_free(kdf);
    X509_ALGOR_free(keyfunc);
    return NULL;
}