OpenCoverage

rsa_x931.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/libressl/src/crypto/rsa/rsa_x931.c
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1/* $OpenBSD: rsa_x931.c,v 1.10 2017/01/29 17:49:23 beck Exp $ */-
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL-
3 * project 2005.-
4 */-
5/* ====================================================================-
6 * Copyright (c) 2005 The OpenSSL Project. All rights reserved.-
7 *-
8 * Redistribution and use in source and binary forms, with or without-
9 * modification, are permitted provided that the following conditions-
10 * are met:-
11 *-
12 * 1. Redistributions of source code must retain the above copyright-
13 * notice, this list of conditions and the following disclaimer.-
14 *-
15 * 2. Redistributions in binary form must reproduce the above copyright-
16 * notice, this list of conditions and the following disclaimer in-
17 * the documentation and/or other materials provided with the-
18 * distribution.-
19 *-
20 * 3. All advertising materials mentioning features or use of this-
21 * software must display the following acknowledgment:-
22 * "This product includes software developed by the OpenSSL Project-
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"-
24 *-
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to-
26 * endorse or promote products derived from this software without-
27 * prior written permission. For written permission, please contact-
28 * licensing@OpenSSL.org.-
29 *-
30 * 5. Products derived from this software may not be called "OpenSSL"-
31 * nor may "OpenSSL" appear in their names without prior written-
32 * permission of the OpenSSL Project.-
33 *-
34 * 6. Redistributions of any form whatsoever must retain the following-
35 * acknowledgment:-
36 * "This product includes software developed by the OpenSSL Project-
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"-
38 *-
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY-
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE-
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR-
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR-
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,-
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT-
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;-
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)-
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,-
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)-
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED-
50 * OF THE POSSIBILITY OF SUCH DAMAGE.-
51 * ====================================================================-
52 *-
53 * This product includes cryptographic software written by Eric Young-
54 * (eay@cryptsoft.com). This product includes software written by Tim-
55 * Hudson (tjh@cryptsoft.com).-
56 *-
57 */-
58-
59#include <stdio.h>-
60#include <string.h>-
61-
62#include <openssl/bn.h>-
63#include <openssl/err.h>-
64#include <openssl/objects.h>-
65#include <openssl/rsa.h>-
66-
67int-
68RSA_padding_add_X931(unsigned char *to, int tlen, const unsigned char *from,-
69 int flen)-
70{-
71 int j;-
72 unsigned char *p;-
73-
74 /*-
75 * Absolute minimum amount of padding is 1 header nibble, 1 padding-
76 * nibble and 2 trailer bytes: but 1 hash if is already in 'from'.-
77 */-
78 j = tlen - flen - 2;-
79-
80 if (j < 0) {
j < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
81 RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);-
82 return -1;
never executed: return -1;
0
83 }-
84-
85 p = (unsigned char *)to;-
86-
87 /* If no padding start and end nibbles are in one byte */-
88 if (j == 0)
j == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
89 *p++ = 0x6A;
never executed: *p++ = 0x6A;
0
90 else {-
91 *p++ = 0x6B;-
92 if (j > 1) {
j > 1Description
TRUEnever evaluated
FALSEnever evaluated
0
93 memset(p, 0xBB, j - 1);-
94 p += j - 1;-
95 }
never executed: end of block
0
96 *p++ = 0xBA;-
97 }
never executed: end of block
0
98 memcpy(p, from, flen);-
99 p += flen;-
100 *p = 0xCC;-
101 return 1;
never executed: return 1;
0
102}-
103-
104int-
105RSA_padding_check_X931(unsigned char *to, int tlen, const unsigned char *from,-
106 int flen, int num)-
107{-
108 int i = 0, j;-
109 const unsigned char *p = from;-
110-
111 if (num != flen || (*p != 0x6A && *p != 0x6B)) {
num != flenDescription
TRUEnever evaluated
FALSEnever evaluated
*p != 0x6ADescription
TRUEnever evaluated
FALSEnever evaluated
*p != 0x6BDescription
TRUEnever evaluated
FALSEnever evaluated
0
112 RSAerror(RSA_R_INVALID_HEADER);-
113 return -1;
never executed: return -1;
0
114 }-
115-
116 if (*p++ == 0x6B) {
*p++ == 0x6BDescription
TRUEnever evaluated
FALSEnever evaluated
0
117 j = flen - 3;-
118 for (i = 0; i < j; i++) {
i < jDescription
TRUEnever evaluated
FALSEnever evaluated
0
119 unsigned char c = *p++;-
120 if (c == 0xBA)
c == 0xBADescription
TRUEnever evaluated
FALSEnever evaluated
0
121 break;
never executed: break;
0
122 if (c != 0xBB) {
c != 0xBBDescription
TRUEnever evaluated
FALSEnever evaluated
0
123 RSAerror(RSA_R_INVALID_PADDING);-
124 return -1;
never executed: return -1;
0
125 }-
126 }
never executed: end of block
0
127-
128 if (i == 0) {
i == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
129 RSAerror(RSA_R_INVALID_PADDING);-
130 return -1;
never executed: return -1;
0
131 }-
132-
133 j -= i;-
134 } else
never executed: end of block
0
135 j = flen - 2;
never executed: j = flen - 2;
0
136-
137 if (j < 0 || p[j] != 0xCC) {
j < 0Description
TRUEnever evaluated
FALSEnever evaluated
p[j] != 0xCCDescription
TRUEnever evaluated
FALSEnever evaluated
0
138 RSAerror(RSA_R_INVALID_TRAILER);-
139 return -1;
never executed: return -1;
0
140 }-
141-
142 memcpy(to, p, j);-
143-
144 return j;
never executed: return j;
0
145}-
146-
147/* Translate between X931 hash ids and NIDs */-
148-
149int-
150RSA_X931_hash_id(int nid)-
151{-
152 switch (nid) {-
153 case NID_sha1:
never executed: case 64:
0
154 return 0x33;
never executed: return 0x33;
0
155 case NID_sha256:
never executed: case 672:
0
156 return 0x34;
never executed: return 0x34;
0
157 case NID_sha384:
never executed: case 673:
0
158 return 0x36;
never executed: return 0x36;
0
159 case NID_sha512:
never executed: case 674:
0
160 return 0x35;
never executed: return 0x35;
0
161 }-
162-
163 return -1;
never executed: return -1;
0
164}-
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