| /* ==================================================================== |
| * Copyright (c) 2014 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * openssl-core@openssl.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| * ==================================================================== |
| * |
| */ |
| |
| #ifndef HEADER_CHACHA_H |
| #define HEADER_CHACHA_H |
| |
| #include <stddef.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* |
| * ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and |
| * nonce and writes the result to |out|, which may be equal to |inp|. |
| * The |key| is not 32 bytes of verbatim key material though, but the |
| * said material collected into 8 32-bit elements array in host byte |
| * order. Same approach applies to nonce: the |counter| argument is |
| * pointer to concatenated nonce and counter values collected into 4 |
| * 32-bit elements. This, passing crypto material collected into 32-bit |
| * elements as opposite to passing verbatim byte vectors, is chosen for |
| * efficiency in multi-call scenarios. |
| */ |
| void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp, |
| size_t len, const unsigned int key[8], |
| const unsigned int counter[4]); |
| /* |
| * You can notice that there is no key setup procedure. Because it's |
| * as trivial as collecting bytes into 32-bit elements, it's reckoned |
| * that below macro is sufficient. |
| */ |
| #define CHACHA_U8TOU32(p) ( \ |
| ((unsigned int)(p)[0]) | ((unsigned int)(p)[1]<<8) | \ |
| ((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24) ) |
| |
| #define CHACHA_KEY_SIZE 32 |
| #define CHACHA_CTR_SIZE 16 |
| #define CHACHA_BLK_SIZE 64 |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif |
