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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Common values for the Poly1305 algorithm
*/
#ifndef _CRYPTO_POLY1305_H
#define _CRYPTO_POLY1305_H
#include <linux/types.h>
#define POLY1305_BLOCK_SIZE 16
#define POLY1305_KEY_SIZE 32
#define POLY1305_DIGEST_SIZE 16
/* The poly1305_key and poly1305_state types are mostly opaque and
* implementation-defined. Limbs might be in base 2^64 or base 2^26, or
* different yet. The union type provided keeps these 64-bit aligned for the
* case in which this is implemented using 64x64 multiplies.
*/
struct poly1305_key {
union {
u32 r[5];
u64 r64[3];
};
};
struct poly1305_core_key {
struct poly1305_key key;
struct poly1305_key precomputed_s;
};
struct poly1305_state {
union {
u32 h[5];
u64 h64[3];
};
};
/* Combined state for block function. */
struct poly1305_block_state {
/* accumulator */
struct poly1305_state h;
/* key */
union {
struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
struct poly1305_core_key core_r;
};
};
struct poly1305_desc_ctx {
/* partial buffer */
u8 buf[POLY1305_BLOCK_SIZE];
/* bytes used in partial buffer */
unsigned int buflen;
/* finalize key */
u32 s[4];
struct poly1305_block_state state;
};
void poly1305_init(struct poly1305_desc_ctx *desc,
const u8 key[POLY1305_KEY_SIZE]);
void poly1305_update(struct poly1305_desc_ctx *desc,
const u8 *src, unsigned int nbytes);
void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest);
#if IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305)
bool poly1305_is_arch_optimized(void);
#else
static inline bool poly1305_is_arch_optimized(void)
{
return false;
}
#endif
#endif
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