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Linux/include/crypto/poly1305.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Common values for the Poly1305 algorithm
  4  */
  5 
  6 #ifndef _CRYPTO_POLY1305_H
  7 #define _CRYPTO_POLY1305_H
  8 
  9 #include <linux/types.h>
 10 #include <linux/crypto.h>
 11 
 12 #define POLY1305_BLOCK_SIZE     16
 13 #define POLY1305_KEY_SIZE       32
 14 #define POLY1305_DIGEST_SIZE    16
 15 
 16 struct poly1305_key {
 17         u32 r[5];       /* key, base 2^26 */
 18 };
 19 
 20 struct poly1305_state {
 21         u32 h[5];       /* accumulator, base 2^26 */
 22 };
 23 
 24 struct poly1305_desc_ctx {
 25         /* key */
 26         struct poly1305_key r;
 27         /* finalize key */
 28         u32 s[4];
 29         /* accumulator */
 30         struct poly1305_state h;
 31         /* partial buffer */
 32         u8 buf[POLY1305_BLOCK_SIZE];
 33         /* bytes used in partial buffer */
 34         unsigned int buflen;
 35         /* r key has been set */
 36         bool rset;
 37         /* s key has been set */
 38         bool sset;
 39 };
 40 
 41 /*
 42  * Poly1305 core functions.  These implement the ε-almost-∆-universal hash
 43  * function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
 44  * ("s key") at the end.  They also only support block-aligned inputs.
 45  */
 46 void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
 47 static inline void poly1305_core_init(struct poly1305_state *state)
 48 {
 49         memset(state->h, 0, sizeof(state->h));
 50 }
 51 void poly1305_core_blocks(struct poly1305_state *state,
 52                           const struct poly1305_key *key,
 53                           const void *src, unsigned int nblocks);
 54 void poly1305_core_emit(const struct poly1305_state *state, void *dst);
 55 
 56 /* Crypto API helper functions for the Poly1305 MAC */
 57 int crypto_poly1305_init(struct shash_desc *desc);
 58 unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
 59                                         const u8 *src, unsigned int srclen);
 60 int crypto_poly1305_update(struct shash_desc *desc,
 61                            const u8 *src, unsigned int srclen);
 62 int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
 63 
 64 #endif
 65 

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