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d02b48c6 | 1 | /* crypto/evp/e_cbc_r2.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | #ifndef NO_RC2 | |
60 | ||
61 | #include <stdio.h> | |
62 | #include "cryptlib.h" | |
ec577822 BM |
63 | #include <openssl/evp.h> |
64 | #include <openssl/objects.h> | |
d02b48c6 | 65 | |
d02b48c6 RE |
66 | static void rc2_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key, |
67 | unsigned char *iv,int enc); | |
68 | static void rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
69 | unsigned char *in, unsigned int inl); | |
e778802f | 70 | static int rc2_meth_to_magic(const EVP_CIPHER *e); |
dfeab068 RE |
71 | static EVP_CIPHER *rc2_magic_to_meth(int i); |
72 | static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); | |
73 | static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type); | |
74 | ||
dfeab068 RE |
75 | #define RC2_40_MAGIC 0xa0 |
76 | #define RC2_64_MAGIC 0x78 | |
77 | #define RC2_128_MAGIC 0x3a | |
78 | ||
d02b48c6 RE |
79 | static EVP_CIPHER r2_cbc_cipher= |
80 | { | |
81 | NID_rc2_cbc, | |
82 | 8,EVP_RC2_KEY_SIZE,8, | |
7f060601 | 83 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH, |
d02b48c6 RE |
84 | rc2_cbc_init_key, |
85 | rc2_cbc_cipher, | |
58964a49 RE |
86 | NULL, |
87 | sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ | |
88 | sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)), | |
dfeab068 RE |
89 | rc2_set_asn1_type_and_iv, |
90 | rc2_get_asn1_type_and_iv, | |
7f060601 | 91 | NULL |
dfeab068 RE |
92 | }; |
93 | ||
94 | static EVP_CIPHER r2_64_cbc_cipher= | |
95 | { | |
1b266dab | 96 | NID_rc2_64_cbc, |
dfeab068 | 97 | 8,8 /* 64 bit */,8, |
7f060601 | 98 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH, |
dfeab068 RE |
99 | rc2_cbc_init_key, |
100 | rc2_cbc_cipher, | |
101 | NULL, | |
102 | sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ | |
103 | sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)), | |
104 | rc2_set_asn1_type_and_iv, | |
105 | rc2_get_asn1_type_and_iv, | |
7f060601 | 106 | NULL |
58964a49 RE |
107 | }; |
108 | ||
109 | static EVP_CIPHER r2_40_cbc_cipher= | |
110 | { | |
111 | NID_rc2_40_cbc, | |
112 | 8,5 /* 40 bit */,8, | |
7f060601 | 113 | EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH, |
58964a49 RE |
114 | rc2_cbc_init_key, |
115 | rc2_cbc_cipher, | |
116 | NULL, | |
117 | sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ | |
118 | sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)), | |
dfeab068 RE |
119 | rc2_set_asn1_type_and_iv, |
120 | rc2_get_asn1_type_and_iv, | |
7f060601 | 121 | NULL |
d02b48c6 RE |
122 | }; |
123 | ||
6b691a5c | 124 | EVP_CIPHER *EVP_rc2_cbc(void) |
d02b48c6 RE |
125 | { |
126 | return(&r2_cbc_cipher); | |
127 | } | |
58964a49 | 128 | |
6b691a5c | 129 | EVP_CIPHER *EVP_rc2_64_cbc(void) |
dfeab068 RE |
130 | { |
131 | return(&r2_64_cbc_cipher); | |
132 | } | |
133 | ||
6b691a5c | 134 | EVP_CIPHER *EVP_rc2_40_cbc(void) |
58964a49 RE |
135 | { |
136 | return(&r2_40_cbc_cipher); | |
137 | } | |
d02b48c6 | 138 | |
6b691a5c UM |
139 | static void rc2_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key, |
140 | unsigned char *iv, int enc) | |
d02b48c6 RE |
141 | { |
142 | if (iv != NULL) | |
58964a49 RE |
143 | memcpy(&(ctx->oiv[0]),iv,8); |
144 | memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8); | |
d02b48c6 | 145 | if (key != NULL) |
58964a49 | 146 | RC2_set_key(&(ctx->c.rc2_ks),EVP_CIPHER_CTX_key_length(ctx), |
7f060601 | 147 | key,EVP_CIPHER_key_length(ctx->cipher)*8); |
d02b48c6 RE |
148 | } |
149 | ||
6b691a5c UM |
150 | static void rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
151 | unsigned char *in, unsigned int inl) | |
d02b48c6 RE |
152 | { |
153 | RC2_cbc_encrypt( | |
154 | in,out,(long)inl, | |
58964a49 | 155 | &(ctx->c.rc2_ks),&(ctx->iv[0]), |
d02b48c6 RE |
156 | ctx->encrypt); |
157 | } | |
158 | ||
6b691a5c | 159 | static int rc2_meth_to_magic(const EVP_CIPHER *e) |
dfeab068 RE |
160 | { |
161 | int i; | |
162 | ||
163 | i=EVP_CIPHER_key_length(e); | |
884e8ec6 DSH |
164 | if (i == 16) return(RC2_128_MAGIC); |
165 | else if (i == 8) return(RC2_64_MAGIC); | |
166 | else if (i == 5) return(RC2_40_MAGIC); | |
dfeab068 RE |
167 | else return(0); |
168 | } | |
169 | ||
6b691a5c | 170 | static EVP_CIPHER *rc2_magic_to_meth(int i) |
dfeab068 RE |
171 | { |
172 | if (i == RC2_128_MAGIC) return(EVP_rc2_cbc()); | |
173 | else if (i == RC2_64_MAGIC) return(EVP_rc2_64_cbc()); | |
174 | else if (i == RC2_40_MAGIC) return(EVP_rc2_40_cbc()); | |
175 | else | |
176 | { | |
177 | EVPerr(EVP_F_RC2_MAGIC_TO_METH,EVP_R_UNSUPPORTED_KEY_SIZE); | |
178 | return(NULL); | |
179 | } | |
180 | } | |
181 | ||
6b691a5c | 182 | static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
dfeab068 RE |
183 | { |
184 | long num=0; | |
185 | int i=0,l; | |
186 | EVP_CIPHER *e; | |
187 | ||
188 | if (type != NULL) | |
189 | { | |
190 | l=EVP_CIPHER_CTX_iv_length(c); | |
191 | i=ASN1_TYPE_get_int_octetstring(type,&num,c->oiv,l); | |
192 | if (i != l) | |
193 | return(-1); | |
194 | else if (i > 0) | |
195 | memcpy(c->iv,c->oiv,l); | |
196 | e=rc2_magic_to_meth((int)num); | |
197 | if (e == NULL) | |
198 | return(-1); | |
199 | if (e != EVP_CIPHER_CTX_cipher(c)) | |
200 | { | |
201 | EVP_CIPHER_CTX_cipher(c)=e; | |
7f060601 | 202 | EVP_CIPHER_CTX_set_key_length(c, EVP_CIPHER_key_length(c)); |
dfeab068 RE |
203 | rc2_cbc_init_key(c,NULL,NULL,1); |
204 | } | |
205 | } | |
206 | return(i); | |
207 | } | |
208 | ||
6b691a5c | 209 | static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) |
dfeab068 RE |
210 | { |
211 | long num; | |
212 | int i=0,j; | |
213 | ||
214 | if (type != NULL) | |
215 | { | |
216 | num=rc2_meth_to_magic(EVP_CIPHER_CTX_cipher(c)); | |
217 | j=EVP_CIPHER_CTX_iv_length(c); | |
218 | i=ASN1_TYPE_set_int_octetstring(type,num,c->oiv,j); | |
219 | } | |
220 | return(i); | |
221 | } | |
222 | ||
d02b48c6 | 223 | #endif |