1 /* SPDX-License-Identifier: GPL-2.0 */
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
16 /* The poly1305_key and poly1305_state types are mostly opaque and
17 * implementation-defined. Limbs might be in base 2^64 or base 2^26, or
18 * different yet. The union type provided keeps these 64-bit aligned for the
19 * case in which this is implemented using 64x64 multiplies.
20 */
21
22 struct poly1305_key {
23 union {
24 u32 r[5];
25 u64 r64[3];
26 };
27 };
28
29 struct poly1305_core_key {
30 struct poly1305_key key;
31 struct poly1305_key precomputed_s;
32 };
33
34 struct poly1305_state {
35 union {
36 u32 h[5];
37 u64 h64[3];
38 };
39 };
40
41 struct 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
61 void poly1305_init_arch(struct poly1305_desc_ctx *desc,
62 const u8 key[POLY1305_KEY_SIZE]);
63 void poly1305_init_generic(struct poly1305_desc_ctx *desc,
64 const u8 key[POLY1305_KEY_SIZE]);
65
66 static 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 else
71 poly1305_init_generic(desc, key);
72 }
73
74 void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src,
75 unsigned int nbytes);
76 void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
77 unsigned int nbytes);
78
79 static 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 else
85 poly1305_update_generic(desc, src, nbytes);
86 }
87
88 void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest);
89 void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest);
90
91 static 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 else
96 poly1305_final_generic(desc, digest);
97 }
98
99 #endif
100
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