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Commit | Line | Data |
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0f113f3e | 1 | /* |
aa6bb135 | 2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. |
e76f935e | 3 | * |
aa6bb135 RS |
4 | * Licensed under the OpenSSL license (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 | |
e76f935e DSH |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
9d6b1ce6 | 12 | #include <openssl/bn.h> |
0aeddcfa | 13 | #include "dh_locl.h" |
9d6b1ce6 DSH |
14 | #include <openssl/objects.h> |
15 | #include <openssl/asn1t.h> | |
e76f935e | 16 | |
9d6b1ce6 | 17 | /* Override the default free and new methods */ |
24484759 | 18 | static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, |
0f113f3e | 19 | void *exarg) |
e76f935e | 20 | { |
0f113f3e MC |
21 | if (operation == ASN1_OP_NEW_PRE) { |
22 | *pval = (ASN1_VALUE *)DH_new(); | |
90945fa3 | 23 | if (*pval != NULL) |
0f113f3e MC |
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 | } | |
31 | return 1; | |
e76f935e DSH |
32 | } |
33 | ||
9d6b1ce6 | 34 | ASN1_SEQUENCE_cb(DHparams, dh_cb) = { |
0f113f3e MC |
35 | ASN1_SIMPLE(DH, p, BIGNUM), |
36 | ASN1_SIMPLE(DH, g, BIGNUM), | |
37 | ASN1_OPT(DH, length, ZLONG), | |
599eccfc | 38 | } ASN1_SEQUENCE_END_cb(DH, DHparams) |
9d6b1ce6 DSH |
39 | |
40 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams) | |
f4274da1 | 41 | |
0f113f3e MC |
42 | /* |
43 | * Internal only structures for handling X9.42 DH: this gets translated to or | |
44 | * from a DH structure straight away. | |
afb14cda DSH |
45 | */ |
46 | ||
0f113f3e MC |
47 | typedef struct { |
48 | ASN1_BIT_STRING *seed; | |
49 | BIGNUM *counter; | |
50 | } int_dhvparams; | |
51 | ||
52 | typedef struct { | |
53 | BIGNUM *p; | |
54 | BIGNUM *q; | |
55 | BIGNUM *g; | |
56 | BIGNUM *j; | |
57 | int_dhvparams *vparams; | |
58 | } int_dhx942_dh; | |
afb14cda DSH |
59 | |
60 | ASN1_SEQUENCE(DHvparams) = { | |
0f113f3e MC |
61 | ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), |
62 | ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) | |
df2ee0e2 | 63 | } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) |
afb14cda DSH |
64 | |
65 | ASN1_SEQUENCE(DHxparams) = { | |
0f113f3e MC |
66 | ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM), |
67 | ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM), | |
68 | ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM), | |
69 | ASN1_OPT(int_dhx942_dh, j, BIGNUM), | |
70 | ASN1_OPT(int_dhx942_dh, vparams, DHvparams), | |
df2ee0e2 | 71 | } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) |
afb14cda | 72 | |
0f113f3e MC |
73 | int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a, |
74 | const unsigned char **pp, long length); | |
75 | int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp); | |
afb14cda DSH |
76 | |
77 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx) | |
78 | ||
0d4fb843 | 79 | /* Application public function: read in X9.42 DH parameters into DH structure */ |
afb14cda | 80 | |
0f113f3e MC |
81 | DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length) |
82 | { | |
83 | int_dhx942_dh *dhx = NULL; | |
84 | DH *dh = NULL; | |
85 | dh = DH_new(); | |
90945fa3 | 86 | if (dh == NULL) |
0f113f3e MC |
87 | return NULL; |
88 | dhx = d2i_int_dhx(NULL, pp, length); | |
90945fa3 | 89 | if (dhx == NULL) { |
0f113f3e MC |
90 | DH_free(dh); |
91 | return NULL; | |
92 | } | |
93 | ||
94 | if (a) { | |
d6407083 | 95 | DH_free(*a); |
0f113f3e MC |
96 | *a = dh; |
97 | } | |
98 | ||
99 | dh->p = dhx->p; | |
100 | dh->q = dhx->q; | |
101 | dh->g = dhx->g; | |
102 | dh->j = dhx->j; | |
103 | ||
104 | if (dhx->vparams) { | |
105 | dh->seed = dhx->vparams->seed->data; | |
106 | dh->seedlen = dhx->vparams->seed->length; | |
107 | dh->counter = dhx->vparams->counter; | |
108 | dhx->vparams->seed->data = NULL; | |
109 | ASN1_BIT_STRING_free(dhx->vparams->seed); | |
110 | OPENSSL_free(dhx->vparams); | |
111 | dhx->vparams = NULL; | |
112 | } | |
113 | ||
114 | OPENSSL_free(dhx); | |
115 | return dh; | |
116 | } | |
117 | ||
118 | int i2d_DHxparams(const DH *dh, unsigned char **pp) | |
119 | { | |
120 | int_dhx942_dh dhx; | |
121 | int_dhvparams dhv; | |
122 | ASN1_BIT_STRING bs; | |
123 | dhx.p = dh->p; | |
124 | dhx.g = dh->g; | |
125 | dhx.q = dh->q; | |
126 | dhx.j = dh->j; | |
127 | if (dh->counter && dh->seed && dh->seedlen > 0) { | |
128 | bs.flags = ASN1_STRING_FLAG_BITS_LEFT; | |
129 | bs.data = dh->seed; | |
130 | bs.length = dh->seedlen; | |
131 | dhv.seed = &bs; | |
132 | dhv.counter = dh->counter; | |
133 | dhx.vparams = &dhv; | |
134 | } else | |
135 | dhx.vparams = NULL; | |
136 | ||
137 | return i2d_int_dhx(&dhx, pp); | |
138 | } |