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d02b48c6 | 1 | /* crypto/asn1/i2d_dhp.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
61 | #include "bn.h" | |
62 | #include "asn1_mac.h" | |
63 | #include "dh.h" | |
64 | ||
65 | /* | |
dfeab068 RE |
66 | * ASN1err(ASN1_F_D2I_DHPARAMS,ERR_R_ASN1_LENGTH_MISMATCH); |
67 | * ASN1err(ASN1_F_X509_DHPARAMS_NEW,ERR_R_ASN1_LENGTH_MISMATCH); | |
d02b48c6 RE |
68 | */ |
69 | ||
6b691a5c | 70 | int i2d_DHparams(DH *a, unsigned char **pp) |
d02b48c6 RE |
71 | { |
72 | BIGNUM *num[3]; | |
73 | ASN1_INTEGER bs; | |
74 | unsigned int j,i,tot=0,len,max=0; | |
75 | int t,ret= -1; | |
76 | unsigned char *p; | |
77 | ||
78 | if (a == NULL) return(0); | |
79 | num[0]=a->p; | |
80 | num[1]=a->g; | |
81 | if (a->length != 0) | |
82 | { | |
83 | if ((num[2]=BN_new()) == NULL) goto err; | |
84 | if (!BN_set_word(num[2],a->length)) goto err; | |
85 | } | |
86 | else | |
87 | num[2]=NULL; | |
88 | ||
89 | for (i=0; i<3; i++) | |
90 | { | |
91 | if (num[i] == NULL) continue; | |
92 | j=BN_num_bits(num[i]); | |
93 | len=((j == 0)?0:((j/8)+1)); | |
94 | if (len > max) max=len; | |
95 | len=ASN1_object_size(0,len, | |
96 | (num[i]->neg)?V_ASN1_NEG_INTEGER:V_ASN1_INTEGER); | |
97 | tot+=len; | |
98 | } | |
99 | ||
100 | t=ASN1_object_size(1,tot,V_ASN1_SEQUENCE); | |
101 | if (pp == NULL) return(t); | |
102 | ||
103 | p= *pp; | |
104 | ASN1_put_object(&p,1,tot,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL); | |
105 | ||
106 | bs.type=V_ASN1_INTEGER; | |
107 | bs.data=(unsigned char *)Malloc(max+4); | |
108 | if (bs.data == NULL) | |
109 | { | |
110 | ASN1err(ASN1_F_I2D_DHPARAMS,ERR_R_MALLOC_FAILURE); | |
111 | goto err; | |
112 | } | |
113 | ||
114 | for (i=0; i<3; i++) | |
115 | { | |
116 | if (num[i] == NULL) continue; | |
117 | bs.length=BN_bn2bin(num[i],bs.data); | |
118 | i2d_ASN1_INTEGER(&bs,&p); | |
119 | } | |
120 | Free((char *)bs.data); | |
121 | ret=t; | |
122 | err: | |
123 | if (num[2] != NULL) BN_free(num[2]); | |
124 | *pp=p; | |
125 | return(ret); | |
126 | } |