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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/* crypto/rsa/rsa_pk1.c */
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 "cryptlib.h"
61#include <openssl/bn.h>
62#include <openssl/rsa.h>
63#include <openssl/rand.h>
64
65int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
66 unsigned char *from, int flen)
67 {
68 int j;
69 unsigned char *p;
70
71 if (flen > (tlen-11))
72 {
73 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
74 return(0);
75 }
76
77 p=(unsigned char *)to;
78
79 *(p++)=0;
80 *(p++)=1; /* Private Key BT (Block Type) */
81
82 /* padd out with 0xff data */
83 j=tlen-3-flen;
84 memset(p,0xff,j);
85 p+=j;
86 *(p++)='\0';
87 memcpy(p,from,(unsigned int)flen);
88 return(1);
89 }
90
91int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
92 unsigned char *from, int flen, int num)
93 {
94 int i,j;
95 unsigned char *p;
96
97 p=from;
98 if ((num != (flen+1)) || (*(p++) != 01))
99 {
100 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BLOCK_TYPE_IS_NOT_01);
101 return(-1);
102 }
103
104 /* scan over padding data */
105 j=flen-1; /* one for type. */
106 for (i=0; i<j; i++)
107 {
108 if (*p != 0xff) /* should decrypt to 0xff */
109 {
110 if (*p == 0)
111 { p++; break; }
112 else {
113 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_FIXED_HEADER_DECRYPT);
114 return(-1);
115 }
116 }
117 p++;
118 }
119
120 if (i == j)
121 {
122 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_NULL_BEFORE_BLOCK_MISSING);
123 return(-1);
124 }
125
126 if (i < 8)
127 {
128 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_BAD_PAD_BYTE_COUNT);
129 return(-1);
130 }
131 i++; /* Skip over the '\0' */
132 j-=i;
133 memcpy(to,p,(unsigned int)j);
134
135 return(j);
136 }
137
138int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
139 unsigned char *from, int flen)
140 {
141 int i,j;
142 unsigned char *p;
143
144 if (flen > (tlen-11))
145 {
146 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
147 return(0);
148 }
149
150 p=(unsigned char *)to;
151
152 *(p++)=0;
153 *(p++)=2; /* Public Key BT (Block Type) */
154
155 /* pad out with non-zero random data */
156 j=tlen-3-flen;
157
158 RAND_bytes(p,j);
159 for (i=0; i<j; i++)
160 {
161 if (*p == '\0')
162 do {
163 RAND_bytes(p,1);
164 } while (*p == '\0');
165 p++;
166 }
167
168 *(p++)='\0';
169
170 memcpy(p,from,(unsigned int)flen);
171 return(1);
172 }
173
174int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
175 unsigned char *from, int flen, int num)
176 {
177 int i,j;
178 unsigned char *p;
179
180 p=from;
181 if ((num != (flen+1)) || (*(p++) != 02))
182 {
183 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02);
184 return(-1);
185 }
186#ifdef PKCS1_CHECK
187 return(num-11);
188#endif
189
190 /* scan over padding data */
191 j=flen-1; /* one for type. */
192 for (i=0; i<j; i++)
193 if (*(p++) == 0) break;
194
195 if (i == j)
196 {
197 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING);
198 return(-1);
199 }
200
201 if (i < 8)
202 {
203 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT);
204 return(-1);
205 }
206 i++; /* Skip over the '\0' */
207 j-=i;
208 memcpy(to,p,(unsigned int)j);
209
210 return(j);
211 }
212
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