Commit | Line | Data |
---|---|---|
48ea8c6e AB |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Poly1305 authenticator algorithm, RFC7539 | |
4 | * | |
5 | * Copyright (C) 2015 Martin Willi | |
6 | * | |
7 | * Based on public domain code by Andrew Moon and Daniel J. Bernstein. | |
8 | */ | |
9 | ||
10 | #include <crypto/internal/poly1305.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <asm/unaligned.h> | |
14 | ||
8d195e7a AB |
15 | void poly1305_init_generic(struct poly1305_desc_ctx *desc, |
16 | const u8 key[POLY1305_KEY_SIZE]) | |
a1d93064 | 17 | { |
1c08a104 | 18 | poly1305_core_setkey(&desc->core_r, key); |
a1d93064 AB |
19 | desc->s[0] = get_unaligned_le32(key + 16); |
20 | desc->s[1] = get_unaligned_le32(key + 20); | |
21 | desc->s[2] = get_unaligned_le32(key + 24); | |
22 | desc->s[3] = get_unaligned_le32(key + 28); | |
23 | poly1305_core_init(&desc->h); | |
24 | desc->buflen = 0; | |
25 | desc->sset = true; | |
1c08a104 | 26 | desc->rset = 2; |
a1d93064 AB |
27 | } |
28 | EXPORT_SYMBOL_GPL(poly1305_init_generic); | |
29 | ||
30 | void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src, | |
31 | unsigned int nbytes) | |
32 | { | |
33 | unsigned int bytes; | |
34 | ||
35 | if (unlikely(desc->buflen)) { | |
36 | bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen); | |
37 | memcpy(desc->buf + desc->buflen, src, bytes); | |
38 | src += bytes; | |
39 | nbytes -= bytes; | |
40 | desc->buflen += bytes; | |
41 | ||
42 | if (desc->buflen == POLY1305_BLOCK_SIZE) { | |
1c08a104 JD |
43 | poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, |
44 | 1, 1); | |
a1d93064 AB |
45 | desc->buflen = 0; |
46 | } | |
47 | } | |
48 | ||
49 | if (likely(nbytes >= POLY1305_BLOCK_SIZE)) { | |
1c08a104 | 50 | poly1305_core_blocks(&desc->h, &desc->core_r, src, |
a1d93064 AB |
51 | nbytes / POLY1305_BLOCK_SIZE, 1); |
52 | src += nbytes - (nbytes % POLY1305_BLOCK_SIZE); | |
53 | nbytes %= POLY1305_BLOCK_SIZE; | |
54 | } | |
55 | ||
56 | if (unlikely(nbytes)) { | |
57 | desc->buflen = nbytes; | |
58 | memcpy(desc->buf, src, nbytes); | |
59 | } | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(poly1305_update_generic); | |
62 | ||
63 | void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *dst) | |
64 | { | |
a1d93064 AB |
65 | if (unlikely(desc->buflen)) { |
66 | desc->buf[desc->buflen++] = 1; | |
67 | memset(desc->buf + desc->buflen, 0, | |
68 | POLY1305_BLOCK_SIZE - desc->buflen); | |
1c08a104 | 69 | poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0); |
a1d93064 AB |
70 | } |
71 | ||
1c08a104 | 72 | poly1305_core_emit(&desc->h, desc->s, dst); |
a1d93064 AB |
73 | *desc = (struct poly1305_desc_ctx){}; |
74 | } | |
75 | EXPORT_SYMBOL_GPL(poly1305_final_generic); | |
76 | ||
48ea8c6e AB |
77 | MODULE_LICENSE("GPL"); |
78 | MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); |