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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a1d9306409
Expose the existing generic Poly1305 code via a init/update/final library interface so that callers are not required to go through the crypto API's shash abstraction to access it. At the same time, make some preparations so that the library implementation can be superseded by an accelerated arch-specific version in the future. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
77 lines
2 KiB
C
77 lines
2 KiB
C
/* 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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struct poly1305_key {
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u32 r[5]; /* key, base 2^26 */
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};
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struct poly1305_state {
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u32 h[5]; /* accumulator, base 2^26 */
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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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struct poly1305_key r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
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};
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void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key);
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void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key);
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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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