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1 | /* | |
2 | * Copyright 2000-2016 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 | #include <stdio.h> | |
11 | #include "internal/cryptlib.h" | |
12 | #include <openssl/bn.h> | |
13 | #include "dh_local.h" | |
14 | #include <openssl/objects.h> | |
15 | #include <openssl/asn1t.h> | |
16 | ||
17 | /* Override the default free and new methods */ | |
18 | static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, | |
19 | void *exarg) | |
20 | { | |
21 | if (operation == ASN1_OP_NEW_PRE) { | |
22 | *pval = (ASN1_VALUE *)DH_new(); | |
23 | if (*pval != NULL) | |
24 | return 2; | |
25 | return 0; | |
26 | } else if (operation == ASN1_OP_FREE_PRE) { | |
27 | DH_free((DH *)*pval); | |
28 | *pval = NULL; | |
29 | return 2; | |
30 | } else if (operation == ASN1_OP_D2I_POST) { | |
31 | ((DH *)*pval)->dirty_cnt++; | |
32 | } | |
33 | return 1; | |
34 | } | |
35 | ||
36 | ASN1_SEQUENCE_cb(DHparams, dh_cb) = { | |
37 | ASN1_SIMPLE(DH, p, BIGNUM), | |
38 | ASN1_SIMPLE(DH, g, BIGNUM), | |
39 | ASN1_OPT_EMBED(DH, length, ZINT32), | |
40 | } ASN1_SEQUENCE_END_cb(DH, DHparams) | |
41 | ||
42 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(DH, DHparams, DHparams) | |
43 | ||
44 | /* | |
45 | * Internal only structures for handling X9.42 DH: this gets translated to or | |
46 | * from a DH structure straight away. | |
47 | */ | |
48 | ||
49 | typedef struct { | |
50 | ASN1_BIT_STRING *seed; | |
51 | BIGNUM *counter; | |
52 | } int_dhvparams; | |
53 | ||
54 | typedef struct { | |
55 | BIGNUM *p; | |
56 | BIGNUM *q; | |
57 | BIGNUM *g; | |
58 | BIGNUM *j; | |
59 | int_dhvparams *vparams; | |
60 | } int_dhx942_dh; | |
61 | ||
62 | ASN1_SEQUENCE(DHvparams) = { | |
63 | ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), | |
64 | ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) | |
65 | } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) | |
66 | ||
67 | ASN1_SEQUENCE(DHxparams) = { | |
68 | ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM), | |
69 | ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM), | |
70 | ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM), | |
71 | ASN1_OPT(int_dhx942_dh, j, BIGNUM), | |
72 | ASN1_OPT(int_dhx942_dh, vparams, DHvparams), | |
73 | } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) | |
74 | ||
75 | int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a, | |
76 | const unsigned char **pp, long length); | |
77 | int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp); | |
78 | ||
79 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(int_dhx942_dh, DHxparams, int_dhx) | |
80 | ||
81 | /* Application public function: read in X9.42 DH parameters into DH structure */ | |
82 | ||
83 | DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length) | |
84 | { | |
85 | int_dhx942_dh *dhx = NULL; | |
86 | DH *dh = NULL; | |
87 | dh = DH_new(); | |
88 | if (dh == NULL) | |
89 | return NULL; | |
90 | dhx = d2i_int_dhx(NULL, pp, length); | |
91 | if (dhx == NULL) { | |
92 | DH_free(dh); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | if (a) { | |
97 | DH_free(*a); | |
98 | *a = dh; | |
99 | } | |
100 | ||
101 | dh->p = dhx->p; | |
102 | dh->q = dhx->q; | |
103 | dh->g = dhx->g; | |
104 | dh->j = dhx->j; | |
105 | ||
106 | if (dhx->vparams) { | |
107 | dh->seed = dhx->vparams->seed->data; | |
108 | dh->seedlen = dhx->vparams->seed->length; | |
109 | dh->counter = dhx->vparams->counter; | |
110 | dhx->vparams->seed->data = NULL; | |
111 | ASN1_BIT_STRING_free(dhx->vparams->seed); | |
112 | OPENSSL_free(dhx->vparams); | |
113 | dhx->vparams = NULL; | |
114 | } | |
115 | ||
116 | OPENSSL_free(dhx); | |
117 | return dh; | |
118 | } | |
119 | ||
120 | int i2d_DHxparams(const DH *dh, unsigned char **pp) | |
121 | { | |
122 | int_dhx942_dh dhx; | |
123 | int_dhvparams dhv; | |
124 | ASN1_BIT_STRING bs; | |
125 | dhx.p = dh->p; | |
126 | dhx.g = dh->g; | |
127 | dhx.q = dh->q; | |
128 | dhx.j = dh->j; | |
129 | if (dh->counter && dh->seed && dh->seedlen > 0) { | |
130 | bs.flags = ASN1_STRING_FLAG_BITS_LEFT; | |
131 | bs.data = dh->seed; | |
132 | bs.length = dh->seedlen; | |
133 | dhv.seed = &bs; | |
134 | dhv.counter = dh->counter; | |
135 | dhx.vparams = &dhv; | |
136 | } else | |
137 | dhx.vparams = NULL; | |
138 | ||
139 | return i2d_int_dhx(&dhx, pp); | |
140 | } |