usr/src/common/crypto/chacha/chacha.h

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright (c) 2015, Joyent, Inc.
  14  */
  15
  16 #ifndef _CHACHA_H
  17 #define _CHACHA_H
  18
  19 /*
  20  * ChaCha cipher implementation header
  21  *
  22  * Note, the chacha C files that we have, have a compile time option for
  23  * generating a keystream only. eg. in other words -DKEYSTREAM_ONLY. If using
  24  * chacha, for something like arc4random, where you aren't doing encryption,
  25  * then you should pass -DKEYSTREAM_ONLY. If encryption is being done, then it
  26  * should not be defined. The main difference is basically doing another pass
  27  * over the data and xoring it with the generated cipher.
  28  */
  29
  30 #include <inttypes.h>
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 typedef struct chacha_ctx {
  37         uint32_t chacha_input[16];
  38 } chacha_ctx_t;
  39
  40 extern void chacha_keysetup(chacha_ctx_t *, const uint8_t *, uint32_t,
  41     uint32_t);
  42 extern void chacha_ivsetup(chacha_ctx_t *, const uint8_t *);
  43 extern void chacha_encrypt_bytes(chacha_ctx_t *, const uint8_t *, uint8_t *,
  44     uint32_t);
  45
  46 #ifdef __cplusplus
  47 }
  48 #endif
  49
  50 #endif /* _CHACHA_H */