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/* spritz.h, spritz C implementation, header |
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* |
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* Copyright (c) 2015 Marc Alexander Lehmann <libev@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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*/ |
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root |
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#include <stdint.h> |
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#include <sys/types.h> |
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/*******************************************************************************/ |
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/* spritz parameters/state type */ |
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enum { |
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spritz_N = 256 |
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}; |
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typedef struct |
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{ |
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uint8_t a, i, j, k, z, w; |
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uint8_t S[spritz_N]; |
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} spritz_state; |
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/*******************************************************************************/ |
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/* the spritz primitives */ |
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void spritz_init (spritz_state *s); |
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void spritz_update (spritz_state *s); |
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void spritz_whip (spritz_state *s, uint_fast16_t r); |
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void spritz_crush (spritz_state *s); |
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void spritz_shuffle (spritz_state *s); |
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void spritz_absorb_nibble (spritz_state *s, uint8_t x); |
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void spritz_absorb (spritz_state *s, const void *I, size_t I_len); |
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void spritz_absorb_stop (spritz_state *s); |
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void spritz_absorb_and_stop (spritz_state *s, const void *I, size_t I_len); /* commonly used helper function */ |
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uint8_t spritz_output (spritz_state *s); |
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void spritz_squeeze (spritz_state *s, void *P, size_t P_len); |
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uint8_t spritz_drip (spritz_state *s); |
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/*******************************************************************************/ |
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/* the spritz-xor cipher */ |
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/* no IV is used if IV_len == 0 */ |
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void spritz_xor_init (spritz_state *s, const void *K, size_t K_len, const void *IV, size_t IV_len); |
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/* can be called multiple times/incrementally */ |
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/* can work inplace */ |
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/* works for both encryption and decryption */ |
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void spritz_xor_crypt (spritz_state *s, const void *I, void *O, size_t len); |
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/*******************************************************************************/ |
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/* the spritz hash */ |
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static void spritz_hash_init (spritz_state *s); |
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static void spritz_hash_add (spritz_state *s, const void *M, size_t M_len); /* can be called multiple times/incrementally */ |
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void spritz_hash_finish (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */ |
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/*******************************************************************************/ |
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/* the spritz MAC */ |
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void spritz_mac_init (spritz_state *s, const void *K, size_t K_len); |
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static void spritz_mac_add (spritz_state *s, const void *M, size_t M_len); /* can be called multiple times/incrementally */ |
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static void spritz_mac_finish (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */ |
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/*******************************************************************************/ |
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/* spritz authenticated encryption */ |
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void spritz_aead_init (spritz_state *s, const void *K, size_t K_len); |
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static void spritz_aead_nonce (spritz_state *s, const void *N, size_t N_len); /* must be called after construction, before associated_data */ |
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static void spritz_aead_associated_data (spritz_state *s, const void *D, size_t D_len); /* must be called after nonce, before crypt */ |
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void spritz_aead_crypt (spritz_state *s, const void *I, void *O, size_t len); |
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/* must be called after associated_data, only once, before finish */ |
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/* works for both encryption and decryption */ |
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static void spritz_aead_finish (spritz_state *s, void *H, size_t H_len); /* must be called at most once at the end */ |
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/*******************************************************************************/ |
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/* the spritz drbg/csprng */ |
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/* constructor takes a seed if S_len != 0, same add spritz_prng_put */ |
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void spritz_prng_init (spritz_state *s, const void *S, size_t S_len); |
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static void spritz_prng_put (spritz_state *s, const void *S, size_t S_len); /* add additional entropy */ |
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static void spritz_prng_get (spritz_state *s, void *R, size_t R_len); /* get random bytes */ |
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/*******************************************************************************/ |
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/* inline functions - some functions are so simple, they are defined inline */ |
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/* the spritz hash inline functions */ |
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static void |
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spritz_hash_init (spritz_state *s) |
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{ |
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spritz_init (s); |
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} |
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static void |
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spritz_hash_add (spritz_state *s, const void *M, size_t M_len) |
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{ |
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spritz_absorb (s, M, M_len); |
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} |
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/* the spritz MAC inline functions */ |
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static void |
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spritz_mac_add (spritz_state *s, const void *M, size_t M_len) |
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{ |
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spritz_hash_add (s, M, M_len); |
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} |
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static void |
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spritz_mac_finish (spritz_state *s, void *H, size_t H_len) |
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{ |
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spritz_hash_finish (s, H, H_len); |
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} |
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/* spritz authenticated encryption inline functions */ |
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static void |
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spritz_aead_nonce (spritz_state *s, const void *N, size_t N_len) |
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{ |
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spritz_absorb_and_stop (s, N, N_len); |
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} |
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static void |
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spritz_aead_associated_data (spritz_state *s, const void *D, size_t D_len) |
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{ |
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spritz_absorb_and_stop (s, D, D_len); |
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} |
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static void |
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spritz_aead_finish (spritz_state *s, void *H, size_t H_len) |
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{ |
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spritz_mac_finish (s, H, H_len); |
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} |
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/* the spritz drbg/csprng inline functions */ |
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static void |
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spritz_prng_put (spritz_state *s, const void *S, size_t S_len) |
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{ |
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spritz_absorb (s, S, S_len); |
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} |
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/* get random bytes */ |
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static void |
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spritz_prng_get (spritz_state *s, void *R, size_t R_len) |
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{ |
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spritz_squeeze (s, R, R_len); |
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} |
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