/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common values for the Poly1305 algorithm
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*/
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#ifndef _CRYPTO_POLY1305_H
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#define _CRYPTO_POLY1305_H
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#include <linux/types.h>
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#include <linux/crypto.h>
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#define POLY1305_BLOCK_SIZE 16
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#define POLY1305_KEY_SIZE 32
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#define POLY1305_DIGEST_SIZE 16
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/* The poly1305_key and poly1305_state types are mostly opaque and
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* implementation-defined. Limbs might be in base 2^64 or base 2^26, or
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* different yet. The union type provided keeps these 64-bit aligned for the
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* case in which this is implemented using 64x64 multiplies.
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*/
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struct poly1305_key {
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union {
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u32 r[5];
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u64 r64[3];
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};
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};
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struct poly1305_core_key {
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struct poly1305_key key;
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struct poly1305_key precomputed_s;
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};
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struct poly1305_state {
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union {
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u32 h[5];
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u64 h64[3];
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};
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};
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struct poly1305_desc_ctx {
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/* partial buffer */
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u8 buf[POLY1305_BLOCK_SIZE];
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/* bytes used in partial buffer */
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unsigned int buflen;
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/* how many keys have been set in r[] */
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unsigned short rset;
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/* whether s[] has been set */
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bool sset;
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/* finalize key */
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u32 s[4];
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/* accumulator */
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struct poly1305_state h;
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/* key */
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union {
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struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
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struct poly1305_core_key core_r;
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};
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};
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void poly1305_init_arch(struct poly1305_desc_ctx *desc,
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const u8 key[POLY1305_KEY_SIZE]);
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void poly1305_init_generic(struct poly1305_desc_ctx *desc,
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const u8 key[POLY1305_KEY_SIZE]);
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static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
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poly1305_init_arch(desc, key);
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else
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poly1305_init_generic(desc, key);
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}
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void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src,
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unsigned int nbytes);
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void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
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unsigned int nbytes);
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static inline void poly1305_update(struct poly1305_desc_ctx *desc,
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const u8 *src, unsigned int nbytes)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
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poly1305_update_arch(desc, src, nbytes);
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else
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poly1305_update_generic(desc, src, nbytes);
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}
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void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest);
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void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest);
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static inline void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
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poly1305_final_arch(desc, digest);
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else
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poly1305_final_generic(desc, digest);
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}
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#endif
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