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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 | ||
a1d93064 AB |
15 | void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key) |
16 | { | |
1c08a104 | 17 | poly1305_core_setkey(&desc->core_r, key); |
a1d93064 AB |
18 | desc->s[0] = get_unaligned_le32(key + 16); |
19 | desc->s[1] = get_unaligned_le32(key + 20); | |
20 | desc->s[2] = get_unaligned_le32(key + 24); | |
21 | desc->s[3] = get_unaligned_le32(key + 28); | |
22 | poly1305_core_init(&desc->h); | |
23 | desc->buflen = 0; | |
24 | desc->sset = true; | |
1c08a104 | 25 | desc->rset = 2; |
a1d93064 AB |
26 | } |
27 | EXPORT_SYMBOL_GPL(poly1305_init_generic); | |
28 | ||
29 | void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src, | |
30 | unsigned int nbytes) | |
31 | { | |
32 | unsigned int bytes; | |
33 | ||
34 | if (unlikely(desc->buflen)) { | |
35 | bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen); | |
36 | memcpy(desc->buf + desc->buflen, src, bytes); | |
37 | src += bytes; | |
38 | nbytes -= bytes; | |
39 | desc->buflen += bytes; | |
40 | ||
41 | if (desc->buflen == POLY1305_BLOCK_SIZE) { | |
1c08a104 JD |
42 | poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, |
43 | 1, 1); | |
a1d93064 AB |
44 | desc->buflen = 0; |
45 | } | |
46 | } | |
47 | ||
48 | if (likely(nbytes >= POLY1305_BLOCK_SIZE)) { | |
1c08a104 | 49 | poly1305_core_blocks(&desc->h, &desc->core_r, src, |
a1d93064 AB |
50 | nbytes / POLY1305_BLOCK_SIZE, 1); |
51 | src += nbytes - (nbytes % POLY1305_BLOCK_SIZE); | |
52 | nbytes %= POLY1305_BLOCK_SIZE; | |
53 | } | |
54 | ||
55 | if (unlikely(nbytes)) { | |
56 | desc->buflen = nbytes; | |
57 | memcpy(desc->buf, src, nbytes); | |
58 | } | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(poly1305_update_generic); | |
61 | ||
62 | void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *dst) | |
63 | { | |
a1d93064 AB |
64 | if (unlikely(desc->buflen)) { |
65 | desc->buf[desc->buflen++] = 1; | |
66 | memset(desc->buf + desc->buflen, 0, | |
67 | POLY1305_BLOCK_SIZE - desc->buflen); | |
1c08a104 | 68 | poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0); |
a1d93064 AB |
69 | } |
70 | ||
1c08a104 | 71 | poly1305_core_emit(&desc->h, desc->s, dst); |
a1d93064 AB |
72 | *desc = (struct poly1305_desc_ctx){}; |
73 | } | |
74 | EXPORT_SYMBOL_GPL(poly1305_final_generic); | |
75 | ||
48ea8c6e AB |
76 | MODULE_LICENSE("GPL"); |
77 | MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); |