Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 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 | |
Eric Biggers | 9d4eee3 | 2018-11-16 17:26:27 -0800 | [diff] [blame] | 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 | |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 24 | struct poly1305_desc_ctx { |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 25 | /* partial buffer */ |
| 26 | u8 buf[POLY1305_BLOCK_SIZE]; |
| 27 | /* bytes used in partial buffer */ |
| 28 | unsigned int buflen; |
Ard Biesheuvel | c99c627 | 2019-11-08 13:22:20 +0100 | [diff] [blame] | 29 | /* how many keys have been set in r[] */ |
| 30 | unsigned short rset; |
| 31 | /* whether s[] has been set */ |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 32 | bool sset; |
Ard Biesheuvel | c99c627 | 2019-11-08 13:22:20 +0100 | [diff] [blame] | 33 | /* finalize key */ |
| 34 | u32 s[4]; |
| 35 | /* accumulator */ |
| 36 | struct poly1305_state h; |
| 37 | /* key */ |
Ard Biesheuvel | d1fa3dd | 2019-11-08 13:22:21 +0100 | [diff] [blame^] | 38 | struct poly1305_key r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE]; |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 39 | }; |
| 40 | |
Ard Biesheuvel | d1fa3dd | 2019-11-08 13:22:21 +0100 | [diff] [blame^] | 41 | void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key); |
| 42 | void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key); |
| 43 | |
| 44 | static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key) |
| 45 | { |
| 46 | if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305)) |
| 47 | poly1305_init_arch(desc, key); |
| 48 | else |
| 49 | poly1305_init_generic(desc, key); |
| 50 | } |
| 51 | |
| 52 | void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src, |
| 53 | unsigned int nbytes); |
| 54 | void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src, |
| 55 | unsigned int nbytes); |
| 56 | |
| 57 | static inline void poly1305_update(struct poly1305_desc_ctx *desc, |
| 58 | const u8 *src, unsigned int nbytes) |
| 59 | { |
| 60 | if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305)) |
| 61 | poly1305_update_arch(desc, src, nbytes); |
| 62 | else |
| 63 | poly1305_update_generic(desc, src, nbytes); |
| 64 | } |
| 65 | |
| 66 | void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest); |
| 67 | void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest); |
| 68 | |
| 69 | static inline void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest) |
| 70 | { |
| 71 | if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305)) |
| 72 | poly1305_final_arch(desc, digest); |
| 73 | else |
| 74 | poly1305_final_generic(desc, digest); |
| 75 | } |
| 76 | |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 77 | #endif |