]>
Commit | Line | Data |
---|---|---|
7dcb2186 AP |
1 | /* ==================================================================== |
2 | * Copyright (c) 2014 The OpenSSL Project. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in | |
13 | * the documentation and/or other materials provided with the | |
14 | * distribution. | |
15 | * | |
16 | * 3. All advertising materials mentioning features or use of this | |
17 | * software must display the following acknowledgment: | |
18 | * "This product includes software developed by the OpenSSL Project | |
19 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
20 | * | |
21 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
22 | * endorse or promote products derived from this software without | |
23 | * prior written permission. For written permission, please contact | |
24 | * openssl-core@openssl.org. | |
25 | * | |
26 | * 5. Products derived from this software may not be called "OpenSSL" | |
27 | * nor may "OpenSSL" appear in their names without prior written | |
28 | * permission of the OpenSSL Project. | |
29 | * | |
30 | * 6. Redistributions of any form whatsoever must retain the following | |
31 | * acknowledgment: | |
32 | * "This product includes software developed by the OpenSSL Project | |
33 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
34 | * | |
35 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
36 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
37 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
38 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
39 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
40 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
41 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
42 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
43 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
44 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
45 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
46 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
47 | * ==================================================================== | |
48 | * | |
49 | */ | |
50 | ||
51 | #ifndef HEADER_CHACHA_H | |
52 | #define HEADER_CHACHA_H | |
53 | ||
54 | #include <stddef.h> | |
55 | ||
56 | #ifdef __cplusplus | |
57 | extern "C" { | |
58 | #endif | |
59 | ||
60 | /* | |
61 | * ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and | |
62 | * nonce and writes the result to |out|, which may be equal to |inp|. | |
63 | * The |key| is not 32 bytes of verbatim key material though, but the | |
64 | * said material collected into 8 32-bit elements array in host byte | |
65 | * order. Same approach applies to nonce: the |counter| argument is | |
66 | * pointer to concatenated nonce and counter values collected into 4 | |
67 | * 32-bit elements. This, passing crypto material collected into 32-bit | |
68 | * elements as opposite to passing verbatim byte vectors, is chosen for | |
69 | * efficiency in multi-call scenarios. | |
70 | */ | |
71 | void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp, | |
72 | size_t len, const unsigned int key[8], | |
73 | const unsigned int counter[4]); | |
74 | /* | |
75 | * You can notice that there is no key setup procedure. Because it's | |
76 | * as trivial as collecting bytes into 32-bit elements, it's reckoned | |
77 | * that below macro is sufficient. | |
78 | */ | |
79 | #define CHACHA_U8TOU32(p) ( \ | |
80 | ((unsigned int)(p)[0]) | ((unsigned int)(p)[1]<<8) | \ | |
81 | ((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24) ) | |
82 | ||
83 | #define CHACHA_KEY_SIZE 32 | |
84 | #define CHACHA_CTR_SIZE 16 | |
85 | #define CHACHA_BLK_SIZE 64 | |
86 | ||
87 | #ifdef __cplusplus | |
88 | } | |
89 | #endif | |
90 | #endif |