/src/boringssl/crypto/cipher_extra/e_rc4.c
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1 | | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
2 | | * All rights reserved. |
3 | | * |
4 | | * This package is an SSL implementation written |
5 | | * by Eric Young (eay@cryptsoft.com). |
6 | | * The implementation was written so as to conform with Netscapes SSL. |
7 | | * |
8 | | * This library is free for commercial and non-commercial use as long as |
9 | | * the following conditions are aheared to. The following conditions |
10 | | * apply to all code found in this distribution, be it the RC4, RSA, |
11 | | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
12 | | * included with this distribution is covered by the same copyright terms |
13 | | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
14 | | * |
15 | | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | | * the code are not to be removed. |
17 | | * If this package is used in a product, Eric Young should be given attribution |
18 | | * as the author of the parts of the library used. |
19 | | * This can be in the form of a textual message at program startup or |
20 | | * in documentation (online or textual) provided with the package. |
21 | | * |
22 | | * Redistribution and use in source and binary forms, with or without |
23 | | * modification, are permitted provided that the following conditions |
24 | | * are met: |
25 | | * 1. Redistributions of source code must retain the copyright |
26 | | * notice, this list of conditions and the following disclaimer. |
27 | | * 2. Redistributions in binary form must reproduce the above copyright |
28 | | * notice, this list of conditions and the following disclaimer in the |
29 | | * documentation and/or other materials provided with the distribution. |
30 | | * 3. All advertising materials mentioning features or use of this software |
31 | | * must display the following acknowledgement: |
32 | | * "This product includes cryptographic software written by |
33 | | * Eric Young (eay@cryptsoft.com)" |
34 | | * The word 'cryptographic' can be left out if the rouines from the library |
35 | | * being used are not cryptographic related :-). |
36 | | * 4. If you include any Windows specific code (or a derivative thereof) from |
37 | | * the apps directory (application code) you must include an acknowledgement: |
38 | | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
39 | | * |
40 | | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
42 | | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
43 | | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
44 | | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
45 | | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
46 | | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
47 | | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
48 | | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
49 | | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
50 | | * SUCH DAMAGE. |
51 | | * |
52 | | * The licence and distribution terms for any publically available version or |
53 | | * derivative of this code cannot be changed. i.e. this code cannot simply be |
54 | | * copied and put under another distribution licence |
55 | | * [including the GNU Public Licence.] */ |
56 | | |
57 | | #include <assert.h> |
58 | | #include <string.h> |
59 | | |
60 | | #include <openssl/cipher.h> |
61 | | #include <openssl/nid.h> |
62 | | #include <openssl/rc4.h> |
63 | | |
64 | | #include "../fipsmodule/cipher/internal.h" |
65 | | |
66 | | |
67 | | static int rc4_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, |
68 | 106 | const uint8_t *iv, int enc) { |
69 | 106 | RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data; |
70 | | |
71 | 106 | RC4_set_key(rc4key, EVP_CIPHER_CTX_key_length(ctx), key); |
72 | 106 | return 1; |
73 | 106 | } |
74 | | |
75 | | static int rc4_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, |
76 | 429 | size_t in_len) { |
77 | 429 | RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data; |
78 | | |
79 | 429 | RC4(rc4key, in_len, in, out); |
80 | 429 | return 1; |
81 | 429 | } |
82 | | |
83 | | static const EVP_CIPHER rc4 = { |
84 | | .nid = NID_rc4, |
85 | | .block_size = 1, |
86 | | .key_len = 16, |
87 | | .iv_len = 0, |
88 | | .ctx_size = sizeof(RC4_KEY), |
89 | | .flags = EVP_CIPH_VARIABLE_LENGTH, |
90 | | .init = rc4_init_key, |
91 | | .cipher = rc4_cipher, |
92 | | }; |
93 | | |
94 | 161 | const EVP_CIPHER *EVP_rc4(void) { return &rc4; } |