spritz/spritz.h

/* spritz.h, spritz C implementation, header
 *
 * Copyright (c) 2015 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#include <stdint.h>
#include <sys/types.h>

/*******************************************************************************/
/* spritz parameters/state type */

enum {
  spritz_N = 256
};

typedef struct
{
  uint8_t a, i, j, k, z, w;
  uint8_t S[spritz_N];
} spritz_state;

/*******************************************************************************/
/* the spritz primitives */

void    spritz_init            (spritz_state *s);
void    spritz_update          (spritz_state *s);
void    spritz_whip            (spritz_state *s, uint_fast16_t r);
void    spritz_crush           (spritz_state *s);
void    spritz_shuffle         (spritz_state *s);
void    spritz_absorb_nibble   (spritz_state *s, uint8_t x);
void    spritz_absorb          (spritz_state *s, const void *I, size_t I_len);
void    spritz_absorb_stop     (spritz_state *s);
void    spritz_absorb_and_stop (spritz_state *s, const void *I, size_t I_len); /* commonly used helper function */
uint8_t spritz_output          (spritz_state *s);
void    spritz_squeeze         (spritz_state *s, void *P, size_t P_len);
uint8_t spritz_drip            (spritz_state *s);

/*******************************************************************************/
/* the spritz-xor cipher */

/* no IV is used if IV_len == 0 */
void spritz_xor_init  (spritz_state *s, const void *K, size_t K_len, const void *IV, size_t IV_len);

/* can be called multiple times/incrementally */
/* can work inplace */
/* works for both encryption and decryption */
void spritz_xor_crypt (spritz_state *s, const void *I, void *O, size_t len);

/*******************************************************************************/
/* the spritz hash */

static void spritz_hash_init   (spritz_state *s);
static void spritz_hash_add    (spritz_state *s, const void *M, size_t M_len); /* can be called multiple times/incrementally */
       void spritz_hash_finish (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */

/*******************************************************************************/
/* the spritz MAC */

       void spritz_mac_init   (spritz_state *s, const void *K, size_t K_len);
static void spritz_mac_add    (spritz_state *s, const void *M, size_t M_len); /* can be called multiple times/incrementally */
static void spritz_mac_finish (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */

/*******************************************************************************/
/* spritz authenticated encryption */

       void spritz_aead_init            (spritz_state *s, const void *K, size_t K_len);
static void spritz_aead_nonce           (spritz_state *s, const void *N, size_t N_len); /* must be called after construction, before associated_data */
static void spritz_aead_associated_data (spritz_state *s, const void *D, size_t D_len); /* must be called after nonce, before crypt */
       void spritz_aead_crypt           (spritz_state *s, const void *I, void *O, size_t len);
/* must be called after associated_data, only once, before finish */
/* works for both encryption and decryption */
static void spritz_aead_finish          (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */

/*******************************************************************************/
/* the spritz drbg/csprng */

/* constructor takes a seed if S_len != 0, same add spritz_prng_put */
       void spritz_prng_init (spritz_state *s, const void *S, size_t S_len);
static void spritz_prng_put  (spritz_state *s, const void *S, size_t S_len); /* add additional entropy */
static void spritz_prng_get  (spritz_state *s, void *R, size_t R_len); /* get random bytes */

/*******************************************************************************/
/* inline functions - some functions are so simple, they are defined inline */

/* the spritz hash inline functions */

static void
spritz_hash_init (spritz_state *s)
{
  spritz_init (s);
}

static void
spritz_hash_add (spritz_state *s, const void *M, size_t M_len)
{
  spritz_absorb (s, M, M_len);
}

/* the spritz MAC inline functions */

static void
spritz_mac_add (spritz_state *s, const void *M, size_t M_len)
{
  spritz_hash_add (s, M, M_len);
}

static void
spritz_mac_finish (spritz_state *s, void *H, size_t H_len)
{
  spritz_hash_finish (s, H, H_len);
}

/* spritz authenticated encryption inline functions */

static void
spritz_aead_nonce (spritz_state *s, const void *N, size_t N_len)
{
  spritz_absorb_and_stop (s, N, N_len);
}

static void
spritz_aead_associated_data (spritz_state *s, const void *D, size_t D_len)
{
  spritz_absorb_and_stop (s, D, D_len);
}

static void
spritz_aead_finish (spritz_state *s, void *H, size_t H_len)
{
  spritz_mac_finish (s, H, H_len);
}

/* the spritz drbg/csprng inline functions */

static void
spritz_prng_put (spritz_state *s, const void *S, size_t S_len)
{
  spritz_absorb (s, S, S_len);
}

/* get random bytes */
static void
spritz_prng_get (spritz_state *s, void *R, size_t R_len)
{
  spritz_squeeze (s, R, R_len);
}

Revision:	1.3
Committed:	Fri Jan 9 23:21:41 2015 UTC (11 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+37 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.3	/* spritz.h, spritz C implementation, header
2			*
3			* Copyright (c) 2015 Marc Alexander Lehmann <libev@schmorp.de>
4			* All rights reserved.
5			*
6			* Redistribution and use in source and binary forms, with or without modifica-
7			* tion, are permitted provided that the following conditions are met:
8			*
9			* 1. Redistributions of source code must retain the above copyright notice,
10			* this list of conditions and the following disclaimer.
11			*
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			*
16			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
18			* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19			* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
20			* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
24			* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25			* OF THE POSSIBILITY OF SUCH DAMAGE.
26			*
27			* Alternatively, the contents of this file may be used under the terms of
28			* the GNU General Public License ("GPL") version 2 or any later version,
29			* in which case the provisions of the GPL are applicable instead of
30			* the above. If you wish to allow the use of your version of this file
31			* only under the terms of the GPL and not to allow others to use your
32			* version of this file under the BSD license, indicate your decision
33			* by deleting the provisions above and replace them with the notice
34			* and other provisions required by the GPL. If you do not delete the
35			* provisions above, a recipient may use your version of this file under
36			* either the BSD or the GPL.
37			*/
38	root	1.1
39			#include <stdint.h>
40			#include <sys/types.h>
41
42			/*******************************************************************************/
43			/* spritz parameters/state type */
44
45			enum {
46			spritz_N = 256
47			};
48
49			typedef struct
50			{
51			uint8_t a, i, j, k, z, w;
52			uint8_t S[spritz_N];
53			} spritz_state;
54
55			/*******************************************************************************/
56			/* the spritz primitives */
57
58			void spritz_init (spritz_state *s);
59			void spritz_update (spritz_state *s);
60			void spritz_whip (spritz_state *s, uint_fast16_t r);
61			void spritz_crush (spritz_state *s);
62			void spritz_shuffle (spritz_state *s);
63			void spritz_absorb_nibble (spritz_state *s, uint8_t x);
64			void spritz_absorb (spritz_state s, const void I, size_t I_len);
65			void spritz_absorb_stop (spritz_state *s);
66			void spritz_absorb_and_stop (spritz_state s, const void I, size_t I_len); /* commonly used helper function */
67			uint8_t spritz_output (spritz_state *s);
68			void spritz_squeeze (spritz_state s, void P, size_t P_len);
69			uint8_t spritz_drip (spritz_state *s);
70
71			/*******************************************************************************/
72			/* the spritz-xor cipher */
73
74			/* no IV is used if IV_len == 0 */
75			void spritz_xor_init (spritz_state s, const void K, size_t K_len, const void *IV, size_t IV_len);
76
77			/* can be called multiple times/incrementally */
78			/* can work inplace */
79			/* works for both encryption and decryption */
80			void spritz_xor_crypt (spritz_state s, const void I, void *O, size_t len);
81
82			/*******************************************************************************/
83			/* the spritz hash */
84
85			static void spritz_hash_init (spritz_state *s);
86			static void spritz_hash_add (spritz_state s, const void M, size_t M_len); /* can be called multiple times/incrementally */
87			void spritz_hash_finish (spritz_state s, void H, size_t H_len); /* must be called at most once at the end */
88
89			/*******************************************************************************/
90			/* the spritz MAC */
91
92			void spritz_mac_init (spritz_state s, const void K, size_t K_len);
93			static void spritz_mac_add (spritz_state s, const void M, size_t M_len); /* can be called multiple times/incrementally */
94			static void spritz_mac_finish (spritz_state s, void H, size_t H_len); /* must be called at most once at the end */
95
96			/*******************************************************************************/
97			/* spritz authenticated encryption */
98
99			void spritz_aead_init (spritz_state s, const void K, size_t K_len);
100			static void spritz_aead_nonce (spritz_state s, const void N, size_t N_len); /* must be called after construction, before associated_data */
101			static void spritz_aead_associated_data (spritz_state s, const void D, size_t D_len); /* must be called after nonce, before crypt */
102			void spritz_aead_crypt (spritz_state s, const void I, void *O, size_t len);
103			/* must be called after associated_data, only once, before finish */
104			/* works for both encryption and decryption */
105			static void spritz_aead_finish (spritz_state s, void H, size_t H_len); /* must be called at most once at the end */
106
107			/*******************************************************************************/
108			/* the spritz drbg/csprng */
109
110			/* constructor takes a seed if S_len != 0, same add spritz_prng_put */
111			void spritz_prng_init (spritz_state s, const void S, size_t S_len);
112			static void spritz_prng_put (spritz_state s, const void S, size_t S_len); /* add additional entropy */
113			static void spritz_prng_get (spritz_state s, void R, size_t R_len); /* get random bytes */
114
115			/*******************************************************************************/
116			/* inline functions - some functions are so simple, they are defined inline */
117
118			/* the spritz hash inline functions */
119
120			static void
121			spritz_hash_init (spritz_state *s)
122			{
123			spritz_init (s);
124			}
125
126			static void
127			spritz_hash_add (spritz_state s, const void M, size_t M_len)
128			{
129			spritz_absorb (s, M, M_len);
130			}
131
132			/* the spritz MAC inline functions */
133
134			static void
135			spritz_mac_add (spritz_state s, const void M, size_t M_len)
136			{
137			spritz_hash_add (s, M, M_len);
138			}
139
140			static void
141			spritz_mac_finish (spritz_state s, void H, size_t H_len)
142			{
143			spritz_hash_finish (s, H, H_len);
144			}
145
146			/* spritz authenticated encryption inline functions */
147
148			static void
149			spritz_aead_nonce (spritz_state s, const void N, size_t N_len)
150			{
151			spritz_absorb_and_stop (s, N, N_len);
152			}
153
154			static void
155			spritz_aead_associated_data (spritz_state s, const void D, size_t D_len)
156			{
157			spritz_absorb_and_stop (s, D, D_len);
158			}
159
160			static void
161			spritz_aead_finish (spritz_state s, void H, size_t H_len)
162			{
163			spritz_mac_finish (s, H, H_len);
164			}
165
166			/* the spritz drbg/csprng inline functions */
167
168			static void
169			spritz_prng_put (spritz_state s, const void S, size_t S_len)
170			{
171			spritz_absorb (s, S, S_len);
172			}
173
174			/* get random bytes */
175			static void
176			spritz_prng_get (spritz_state s, void R, size_t R_len)
177			{
178			spritz_squeeze (s, R, R_len);
179			}
180