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      1 /* Copyright (c) 2014, Google Inc.
      2  *
      3  * Permission to use, copy, modify, and/or distribute this software for any
      4  * purpose with or without fee is hereby granted, provided that the above
      5  * copyright notice and this permission notice appear in all copies.
      6  *
      7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
     14 
     15 #ifndef OPENSSL_HEADER_CHACHA_H
     16 #define OPENSSL_HEADER_CHACHA_H
     17 
     18 #include <openssl/base.h>
     19 
     20 #ifdef  __cplusplus
     21 extern "C" {
     22 #endif
     23 
     24 
     25 /* CRYPTO_chacha_20 encrypts |in_len| bytes from |in| with the given key and
     26  * nonce and writes the result to |out|, which may be equal to |in|. The
     27  * initial block counter is specified by |counter|. */
     28 OPENSSL_EXPORT void CRYPTO_chacha_20(uint8_t *out, const uint8_t *in,
     29                                      size_t in_len, const uint8_t key[32],
     30                                      const uint8_t nonce[12], uint32_t counter);
     31 
     32 
     33 #if defined(__cplusplus)
     34 }  /* extern C */
     35 #endif
     36 
     37 #endif  /* OPENSSL_HEADER_CHACHA_H */
     38