lib/libcrypto/chacha/chacha.h

   1 /* $OpenBSD: chacha.h,v 1.7 2015/12/09 14:07:55 bcook Exp $ */
   2 /*
   3  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #ifndef HEADER_CHACHA_H
  19 #define HEADER_CHACHA_H
  20
  21 #include <openssl/opensslconf.h>
  22
  23 #if defined(OPENSSL_NO_CHACHA)
  24 #error ChaCha is disabled.
  25 #endif
  26
  27 #include <stddef.h>
  28 #include <stdint.h>
  29
  30 #ifdef  __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 typedef struct {
  35         unsigned int input[16];
  36         unsigned char ks[64];
  37         unsigned char unused;
  38 } ChaCha_ctx;
  39
  40 void ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key,
  41     unsigned int keybits);
  42 void ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
  43     const unsigned char *counter);
  44 void ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in,
  45     size_t len);
  46
  47 void CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
  48     const unsigned char key[32], const unsigned char iv[8], uint64_t counter);
  49
  50 #ifdef  __cplusplus
  51 }
  52 #endif
  53
  54 #endif /* HEADER_CHACHA_H */