Line data Source code
1 : /* crypto/evp/e_rc4.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 :
62 : #ifndef OPENSSL_NO_RC4
63 :
64 : # include <openssl/evp.h>
65 : # include "evp_locl.h"
66 : # include <openssl/objects.h>
67 : # include <openssl/rc4.h>
68 :
69 : /* FIXME: surely this is available elsewhere? */
70 : # define EVP_RC4_KEY_SIZE 16
71 :
72 : typedef struct {
73 : RC4_KEY ks; /* working key */
74 : } EVP_RC4_KEY;
75 :
76 : # define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
77 :
78 : static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
79 : const unsigned char *iv, int enc);
80 : static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
81 : const unsigned char *in, size_t inl);
82 : static const EVP_CIPHER r4_cipher = {
83 : NID_rc4,
84 : 1, EVP_RC4_KEY_SIZE, 0,
85 : EVP_CIPH_VARIABLE_LENGTH,
86 : rc4_init_key,
87 : rc4_cipher,
88 : NULL,
89 : sizeof(EVP_RC4_KEY),
90 : NULL,
91 : NULL,
92 : NULL,
93 : NULL
94 : };
95 :
96 : static const EVP_CIPHER r4_40_cipher = {
97 : NID_rc4_40,
98 : 1, 5 /* 40 bit */ , 0,
99 : EVP_CIPH_VARIABLE_LENGTH,
100 : rc4_init_key,
101 : rc4_cipher,
102 : NULL,
103 : sizeof(EVP_RC4_KEY),
104 : NULL,
105 : NULL,
106 : NULL,
107 : NULL
108 : };
109 :
110 242 : const EVP_CIPHER *EVP_rc4(void)
111 : {
112 242 : return (&r4_cipher);
113 : }
114 :
115 121 : const EVP_CIPHER *EVP_rc4_40(void)
116 : {
117 121 : return (&r4_40_cipher);
118 : }
119 :
120 0 : static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
121 : const unsigned char *iv, int enc)
122 : {
123 0 : RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
124 0 : return 1;
125 : }
126 :
127 0 : static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
128 : const unsigned char *in, size_t inl)
129 : {
130 0 : RC4(&data(ctx)->ks, inl, in, out);
131 0 : return 1;
132 : }
133 : #endif
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