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031e5cce SM |
1 | /* crypto/bn/bn_mpi.c */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * All rights reserved. | |
3e575651 | 4 | * |
031e5cce SM |
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.] | |
3e575651 SL |
57 | */ |
58 | ||
59 | #include <stdio.h> | |
031e5cce | 60 | #include "cryptlib.h" |
3e575651 SL |
61 | #include "bn_lcl.h" |
62 | ||
63 | int BN_bn2mpi(const BIGNUM *a, unsigned char *d) | |
d3819813 MTL |
64 | { |
65 | int bits; | |
66 | int num = 0; | |
67 | int ext = 0; | |
68 | long l; | |
3e575651 | 69 | |
d3819813 MTL |
70 | bits = BN_num_bits(a); |
71 | num = (bits + 7) / 8; | |
72 | if (bits > 0) { | |
73 | ext = ((bits & 0x07) == 0); | |
74 | } | |
75 | if (d == NULL) | |
76 | return (num + 4 + ext); | |
3e575651 | 77 | |
d3819813 MTL |
78 | l = num + ext; |
79 | d[0] = (unsigned char)(l >> 24) & 0xff; | |
80 | d[1] = (unsigned char)(l >> 16) & 0xff; | |
81 | d[2] = (unsigned char)(l >> 8) & 0xff; | |
82 | d[3] = (unsigned char)(l) & 0xff; | |
83 | if (ext) | |
84 | d[4] = 0; | |
85 | num = BN_bn2bin(a, &(d[4 + ext])); | |
86 | if (a->neg) | |
87 | d[4] |= 0x80; | |
88 | return (num + 4 + ext); | |
89 | } | |
3e575651 | 90 | |
031e5cce | 91 | BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a) |
d3819813 MTL |
92 | { |
93 | long len; | |
94 | int neg = 0; | |
3e575651 | 95 | |
d3819813 MTL |
96 | if (n < 4) { |
97 | BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH); | |
031e5cce | 98 | return (NULL); |
d3819813 MTL |
99 | } |
100 | len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int) | |
101 | d[3]; | |
102 | if ((len + 4) != n) { | |
103 | BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR); | |
031e5cce | 104 | return (NULL); |
d3819813 | 105 | } |
3e575651 | 106 | |
031e5cce | 107 | if (a == NULL) |
d3819813 MTL |
108 | a = BN_new(); |
109 | if (a == NULL) | |
031e5cce | 110 | return (NULL); |
3e575651 | 111 | |
d3819813 MTL |
112 | if (len == 0) { |
113 | a->neg = 0; | |
114 | a->top = 0; | |
031e5cce | 115 | return (a); |
d3819813 MTL |
116 | } |
117 | d += 4; | |
118 | if ((*d) & 0x80) | |
119 | neg = 1; | |
031e5cce SM |
120 | if (BN_bin2bn(d, (int)len, a) == NULL) |
121 | return (NULL); | |
d3819813 MTL |
122 | a->neg = neg; |
123 | if (neg) { | |
124 | BN_clear_bit(a, BN_num_bits(a) - 1); | |
125 | } | |
126 | bn_check_top(a); | |
031e5cce | 127 | return (a); |
d3819813 | 128 | } |