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 */ 51