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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 | * |
e38873f5 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
aa6bb135 RS |
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> |
706457b7 | 13 | #include "dh_local.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; | |
8b84b075 RL |
30 | } else if (operation == ASN1_OP_D2I_POST) { |
31 | ((DH *)*pval)->dirty_cnt++; | |
0f113f3e MC |
32 | } |
33 | return 1; | |
e76f935e DSH |
34 | } |
35 | ||
9d6b1ce6 | 36 | ASN1_SEQUENCE_cb(DHparams, dh_cb) = { |
0f113f3e MC |
37 | ASN1_SIMPLE(DH, p, BIGNUM), |
38 | ASN1_SIMPLE(DH, g, BIGNUM), | |
9612e157 | 39 | ASN1_OPT_EMBED(DH, length, ZINT32), |
599eccfc | 40 | } ASN1_SEQUENCE_END_cb(DH, DHparams) |
9d6b1ce6 | 41 | |
9fdcc21f | 42 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(DH, DHparams, DHparams) |
f4274da1 | 43 | |
0f113f3e MC |
44 | /* |
45 | * Internal only structures for handling X9.42 DH: this gets translated to or | |
46 | * from a DH structure straight away. | |
afb14cda DSH |
47 | */ |
48 | ||
0f113f3e MC |
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; | |
afb14cda DSH |
61 | |
62 | ASN1_SEQUENCE(DHvparams) = { | |
0f113f3e MC |
63 | ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), |
64 | ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) | |
df2ee0e2 | 65 | } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) |
afb14cda DSH |
66 | |
67 | ASN1_SEQUENCE(DHxparams) = { | |
0f113f3e MC |
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), | |
df2ee0e2 | 73 | } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) |
afb14cda | 74 | |
0f113f3e MC |
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); | |
afb14cda | 78 | |
9fdcc21f | 79 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(int_dhx942_dh, DHxparams, int_dhx) |
afb14cda | 80 | |
0d4fb843 | 81 | /* Application public function: read in X9.42 DH parameters into DH structure */ |
afb14cda | 82 | |
0f113f3e MC |
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(); | |
90945fa3 | 88 | if (dh == NULL) |
0f113f3e MC |
89 | return NULL; |
90 | dhx = d2i_int_dhx(NULL, pp, length); | |
90945fa3 | 91 | if (dhx == NULL) { |
0f113f3e MC |
92 | DH_free(dh); |
93 | return NULL; | |
94 | } | |
95 | ||
96 | if (a) { | |
d6407083 | 97 | DH_free(*a); |
0f113f3e MC |
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 | } |