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diff --git a/src/lib/libcrypto/rsa/rsa_pk1.c b/src/lib/libcrypto/rsa/rsa_pk1.c
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1/* $OpenBSD: rsa_pk1.c,v 1.14 2014/10/22 13:02:04 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 <stdlib.h>
61#include <string.h>
62
63#include <openssl/bn.h>
64#include <openssl/err.h>
65#include <openssl/rsa.h>
66
67int
68RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
69 const unsigned char *from, int flen)
70{
71 int j;
72 unsigned char *p;
73
74 if (flen > (tlen - RSA_PKCS1_PADDING_SIZE)) {
75 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,
76 RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
77 return 0;
78 }
79
80 p = (unsigned char *)to;
81
82 *(p++) = 0;
83 *(p++) = 1; /* Private Key BT (Block Type) */
84
85 /* pad out with 0xff data */
86 j = tlen - 3 - flen;
87 memset(p, 0xff, j);
88 p += j;
89 *(p++) = '\0';
90 memcpy(p, from, flen);
91
92 return 1;
93}
94
95int
96RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
97 const unsigned char *from, int flen, int num)
98{
99 int i, j;
100 const unsigned char *p;
101
102 p = from;
103 if (num != flen + 1 || *(p++) != 01) {
104 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,
105 RSA_R_BLOCK_TYPE_IS_NOT_01);
106 return -1;
107 }
108
109 /* scan over padding data */
110 j = flen - 1; /* one for type. */
111 for (i = 0; i < j; i++) {
112 if (*p != 0xff) {
113 /* should decrypt to 0xff */
114 if (*p == 0) {
115 p++;
116 break;
117 } else {
118 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,
119 RSA_R_BAD_FIXED_HEADER_DECRYPT);
120 return -1;
121 }
122 }
123 p++;
124 }
125
126 if (i == j) {
127 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,
128 RSA_R_NULL_BEFORE_BLOCK_MISSING);
129 return -1;
130 }
131
132 if (i < 8) {
133 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,
134 RSA_R_BAD_PAD_BYTE_COUNT);
135 return -1;
136 }
137 i++; /* Skip over the '\0' */
138 j -= i;
139 if (j > tlen) {
140 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,
141 RSA_R_DATA_TOO_LARGE);
142 return -1;
143 }
144 memcpy(to, p, j);
145
146 return j;
147}
148
149int
150RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
151 const unsigned char *from, int flen)
152{
153 int i, j;
154 unsigned char *p;
155
156 if (flen > tlen - 11) {
157 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,
158 RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
159 return 0;
160 }
161
162 p = (unsigned char *)to;
163
164 *(p++) = 0;
165 *(p++) = 2; /* Public Key BT (Block Type) */
166
167 /* pad out with non-zero random data */
168 j = tlen - 3 - flen;
169
170 arc4random_buf(p, j);
171 for (i = 0; i < j; i++) {
172 while (*p == '\0')
173 arc4random_buf(p, 1);
174 p++;
175 }
176
177 *(p++) = '\0';
178
179 memcpy(p, from, flen);
180 return 1;
181}
182
183int
184RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
185 const unsigned char *from, int flen, int num)
186{
187 int i, j;
188 const unsigned char *p;
189
190 p = from;
191 if (num != flen + 1 || *(p++) != 02) {
192 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,
193 RSA_R_BLOCK_TYPE_IS_NOT_02);
194 return -1;
195 }
196
197 /* scan over padding data */
198 j = flen - 1; /* one for type. */
199 for (i = 0; i < j; i++)
200 if (*(p++) == 0)
201 break;
202
203 if (i == j) {
204 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,
205 RSA_R_NULL_BEFORE_BLOCK_MISSING);
206 return -1;
207 }
208
209 if (i < 8) {
210 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,
211 RSA_R_BAD_PAD_BYTE_COUNT);
212 return -1;
213 }
214 i++; /* Skip over the '\0' */
215 j -= i;
216 if (j > tlen) {
217 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,
218 RSA_R_DATA_TOO_LARGE);
219 return -1;
220 }
221 memcpy(to, p, j);
222
223 return j;
224}