100 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Common values for the Poly1305 algorithm4 */5 6#ifndef _CRYPTO_POLY1305_H7#define _CRYPTO_POLY1305_H8 9#include <linux/types.h>10#include <linux/crypto.h>11 12#define POLY1305_BLOCK_SIZE 1613#define POLY1305_KEY_SIZE 3214#define POLY1305_DIGEST_SIZE 1615 16/* The poly1305_key and poly1305_state types are mostly opaque and17 * implementation-defined. Limbs might be in base 2^64 or base 2^26, or18 * different yet. The union type provided keeps these 64-bit aligned for the19 * case in which this is implemented using 64x64 multiplies.20 */21 22struct poly1305_key {23 union {24 u32 r[5];25 u64 r64[3];26 };27};28 29struct poly1305_core_key {30 struct poly1305_key key;31 struct poly1305_key precomputed_s;32};33 34struct poly1305_state {35 union {36 u32 h[5];37 u64 h64[3];38 };39};40 41struct poly1305_desc_ctx {42 /* partial buffer */43 u8 buf[POLY1305_BLOCK_SIZE];44 /* bytes used in partial buffer */45 unsigned int buflen;46 /* how many keys have been set in r[] */47 unsigned short rset;48 /* whether s[] has been set */49 bool sset;50 /* finalize key */51 u32 s[4];52 /* accumulator */53 struct poly1305_state h;54 /* key */55 union {56 struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];57 struct poly1305_core_key core_r;58 };59};60 61void poly1305_init_arch(struct poly1305_desc_ctx *desc,62 const u8 key[POLY1305_KEY_SIZE]);63void poly1305_init_generic(struct poly1305_desc_ctx *desc,64 const u8 key[POLY1305_KEY_SIZE]);65 66static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key)67{68 if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))69 poly1305_init_arch(desc, key);70 else71 poly1305_init_generic(desc, key);72}73 74void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src,75 unsigned int nbytes);76void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,77 unsigned int nbytes);78 79static inline void poly1305_update(struct poly1305_desc_ctx *desc,80 const u8 *src, unsigned int nbytes)81{82 if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))83 poly1305_update_arch(desc, src, nbytes);84 else85 poly1305_update_generic(desc, src, nbytes);86}87 88void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest);89void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest);90 91static inline void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest)92{93 if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))94 poly1305_final_arch(desc, digest);95 else96 poly1305_final_generic(desc, digest);97}98 99#endif100