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//#include "spritz.h" |
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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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|
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enum { |
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spritz_N = 256 |
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}; |
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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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/*******************************************************************************/ |
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/* the spritz primitives */ |
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|
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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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/*******************************************************************************/ |
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/* the spritz-xor cipher */ |
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|
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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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/*******************************************************************************/ |
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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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/*******************************************************************************/ |
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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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/*******************************************************************************/ |
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/* spritz authenticated encryption */ |
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|
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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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/*******************************************************************************/ |
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/* inline functions - some functions are so simple, they are defined inline */ |
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|
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/* the spritz hash inline functions */ |
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|
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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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|
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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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|
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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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|
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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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|
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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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