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58964a49 RE |
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" | |
ec577822 BM |
61 | #include <openssl/bn.h> |
62 | #include <openssl/rsa.h> | |
63 | #include <openssl/rand.h> | |
58964a49 | 64 | |
6b691a5c | 65 | int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, |
29c1f061 | 66 | const unsigned char *from, int flen) |
58964a49 RE |
67 | { |
68 | int j; | |
69 | unsigned char *p; | |
70 | ||
ba8ad074 | 71 | if (flen > (tlen-RSA_PKCS1_PADDING_SIZE)) |
58964a49 RE |
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 | ||
17ef2916 | 82 | /* pad out with 0xff data */ |
58964a49 RE |
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 | ||
6b691a5c | 91 | int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, |
29c1f061 | 92 | const unsigned char *from, int flen, int num) |
58964a49 RE |
93 | { |
94 | int i,j; | |
29c1f061 | 95 | const unsigned char *p; |
58964a49 RE |
96 | |
97 | p=from; | |
dfeab068 | 98 | if ((num != (flen+1)) || (*(p++) != 01)) |
58964a49 RE |
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; | |
17ef2916 UM |
133 | if (j > tlen) |
134 | { | |
135 | RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1,RSA_R_DATA_TOO_LARGE); | |
136 | return(-1); | |
137 | } | |
58964a49 RE |
138 | memcpy(to,p,(unsigned int)j); |
139 | ||
140 | return(j); | |
141 | } | |
142 | ||
6b691a5c | 143 | int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, |
29c1f061 | 144 | const unsigned char *from, int flen) |
58964a49 RE |
145 | { |
146 | int i,j; | |
147 | unsigned char *p; | |
148 | ||
149 | if (flen > (tlen-11)) | |
150 | { | |
151 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
152 | return(0); | |
153 | } | |
154 | ||
155 | p=(unsigned char *)to; | |
156 | ||
157 | *(p++)=0; | |
158 | *(p++)=2; /* Public Key BT (Block Type) */ | |
159 | ||
160 | /* pad out with non-zero random data */ | |
161 | j=tlen-3-flen; | |
162 | ||
eb952088 UM |
163 | if (RAND_bytes(p,j) <= 0) |
164 | return(0); | |
58964a49 RE |
165 | for (i=0; i<j; i++) |
166 | { | |
167 | if (*p == '\0') | |
168 | do { | |
eb952088 UM |
169 | if (RAND_bytes(p,1) <= 0) |
170 | return(0); | |
58964a49 RE |
171 | } while (*p == '\0'); |
172 | p++; | |
173 | } | |
174 | ||
175 | *(p++)='\0'; | |
176 | ||
177 | memcpy(p,from,(unsigned int)flen); | |
178 | return(1); | |
179 | } | |
180 | ||
6b691a5c | 181 | int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, |
29c1f061 | 182 | const unsigned char *from, int flen, int num) |
58964a49 RE |
183 | { |
184 | int i,j; | |
29c1f061 | 185 | const unsigned char *p; |
58964a49 RE |
186 | |
187 | p=from; | |
dfeab068 | 188 | if ((num != (flen+1)) || (*(p++) != 02)) |
58964a49 RE |
189 | { |
190 | RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BLOCK_TYPE_IS_NOT_02); | |
191 | return(-1); | |
192 | } | |
dfeab068 RE |
193 | #ifdef PKCS1_CHECK |
194 | return(num-11); | |
195 | #endif | |
58964a49 RE |
196 | |
197 | /* scan over padding data */ | |
198 | j=flen-1; /* one for type. */ | |
199 | for (i=0; i<j; i++) | |
200 | if (*(p++) == 0) break; | |
201 | ||
202 | if (i == j) | |
203 | { | |
204 | RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_NULL_BEFORE_BLOCK_MISSING); | |
205 | return(-1); | |
206 | } | |
207 | ||
208 | if (i < 8) | |
209 | { | |
210 | RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_BAD_PAD_BYTE_COUNT); | |
211 | return(-1); | |
212 | } | |
213 | i++; /* Skip over the '\0' */ | |
214 | j-=i; | |
17ef2916 UM |
215 | if (j > tlen) |
216 | { | |
217 | RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2,RSA_R_DATA_TOO_LARGE); | |
218 | return(-1); | |
219 | } | |
58964a49 RE |
220 | memcpy(to,p,(unsigned int)j); |
221 | ||
222 | return(j); | |
223 | } | |
224 |