1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Poly1305 authenticator algorithm, RFC7539 3 * Poly1305 authenticator algorithm, RFC7539
4 * 4 *
5 * Copyright (C) 2015 Martin Willi 5 * Copyright (C) 2015 Martin Willi
6 * 6 *
7 * Based on public domain code by Andrew Moon 7 * Based on public domain code by Andrew Moon and Daniel J. Bernstein.
8 */ 8 */
9 9
10 #include <crypto/internal/poly1305.h> 10 #include <crypto/internal/poly1305.h>
11 #include <linux/kernel.h> 11 #include <linux/kernel.h>
12 #include <linux/module.h> 12 #include <linux/module.h>
13 #include <linux/unaligned.h> !! 13 #include <asm/unaligned.h>
14 14
15 void poly1305_init_generic(struct poly1305_des !! 15 void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key)
16 const u8 key[POLY13 <<
17 { 16 {
18 poly1305_core_setkey(&desc->core_r, ke 17 poly1305_core_setkey(&desc->core_r, key);
19 desc->s[0] = get_unaligned_le32(key + 18 desc->s[0] = get_unaligned_le32(key + 16);
20 desc->s[1] = get_unaligned_le32(key + 19 desc->s[1] = get_unaligned_le32(key + 20);
21 desc->s[2] = get_unaligned_le32(key + 20 desc->s[2] = get_unaligned_le32(key + 24);
22 desc->s[3] = get_unaligned_le32(key + 21 desc->s[3] = get_unaligned_le32(key + 28);
23 poly1305_core_init(&desc->h); 22 poly1305_core_init(&desc->h);
24 desc->buflen = 0; 23 desc->buflen = 0;
25 desc->sset = true; 24 desc->sset = true;
26 desc->rset = 2; 25 desc->rset = 2;
27 } 26 }
28 EXPORT_SYMBOL_GPL(poly1305_init_generic); 27 EXPORT_SYMBOL_GPL(poly1305_init_generic);
29 28
30 void poly1305_update_generic(struct poly1305_d 29 void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
31 unsigned int nbyt 30 unsigned int nbytes)
32 { 31 {
33 unsigned int bytes; 32 unsigned int bytes;
34 33
35 if (unlikely(desc->buflen)) { 34 if (unlikely(desc->buflen)) {
36 bytes = min(nbytes, POLY1305_B 35 bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen);
37 memcpy(desc->buf + desc->bufle 36 memcpy(desc->buf + desc->buflen, src, bytes);
38 src += bytes; 37 src += bytes;
39 nbytes -= bytes; 38 nbytes -= bytes;
40 desc->buflen += bytes; 39 desc->buflen += bytes;
41 40
42 if (desc->buflen == POLY1305_B 41 if (desc->buflen == POLY1305_BLOCK_SIZE) {
43 poly1305_core_blocks(& 42 poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf,
44 1 43 1, 1);
45 desc->buflen = 0; 44 desc->buflen = 0;
46 } 45 }
47 } 46 }
48 47
49 if (likely(nbytes >= POLY1305_BLOCK_SI 48 if (likely(nbytes >= POLY1305_BLOCK_SIZE)) {
50 poly1305_core_blocks(&desc->h, 49 poly1305_core_blocks(&desc->h, &desc->core_r, src,
51 nbytes / 50 nbytes / POLY1305_BLOCK_SIZE, 1);
52 src += nbytes - (nbytes % POLY 51 src += nbytes - (nbytes % POLY1305_BLOCK_SIZE);
53 nbytes %= POLY1305_BLOCK_SIZE; 52 nbytes %= POLY1305_BLOCK_SIZE;
54 } 53 }
55 54
56 if (unlikely(nbytes)) { 55 if (unlikely(nbytes)) {
57 desc->buflen = nbytes; 56 desc->buflen = nbytes;
58 memcpy(desc->buf, src, nbytes) 57 memcpy(desc->buf, src, nbytes);
59 } 58 }
60 } 59 }
61 EXPORT_SYMBOL_GPL(poly1305_update_generic); 60 EXPORT_SYMBOL_GPL(poly1305_update_generic);
62 61
63 void poly1305_final_generic(struct poly1305_de 62 void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *dst)
64 { 63 {
65 if (unlikely(desc->buflen)) { 64 if (unlikely(desc->buflen)) {
66 desc->buf[desc->buflen++] = 1; 65 desc->buf[desc->buflen++] = 1;
67 memset(desc->buf + desc->bufle 66 memset(desc->buf + desc->buflen, 0,
68 POLY1305_BLOCK_SIZE - d 67 POLY1305_BLOCK_SIZE - desc->buflen);
69 poly1305_core_blocks(&desc->h, 68 poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0);
70 } 69 }
71 70
72 poly1305_core_emit(&desc->h, desc->s, 71 poly1305_core_emit(&desc->h, desc->s, dst);
73 *desc = (struct poly1305_desc_ctx){}; 72 *desc = (struct poly1305_desc_ctx){};
74 } 73 }
75 EXPORT_SYMBOL_GPL(poly1305_final_generic); 74 EXPORT_SYMBOL_GPL(poly1305_final_generic);
76 75
77 MODULE_LICENSE("GPL"); 76 MODULE_LICENSE("GPL");
78 MODULE_AUTHOR("Martin Willi <martin@strongswan 77 MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
79 MODULE_DESCRIPTION("Poly1305 authenticator alg <<
80 78
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