1 /* 1 /*
2 * Poly1305 authenticator algorithm, RFC7539 2 * Poly1305 authenticator algorithm, RFC7539
3 * 3 *
4 * Copyright (C) 2015 Martin Willi 4 * Copyright (C) 2015 Martin Willi
5 * 5 *
6 * Based on public domain code by Andrew Moon 6 * Based on public domain code by Andrew Moon and Daniel J. Bernstein.
7 * 7 *
8 * This program is free software; you can redi 8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Publi 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either versio 10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 11 * (at your option) any later version.
12 */ 12 */
13 13
14 #include <crypto/algapi.h> 14 #include <crypto/algapi.h>
15 #include <crypto/internal/hash.h> 15 #include <crypto/internal/hash.h>
16 #include <crypto/internal/poly1305.h> 16 #include <crypto/internal/poly1305.h>
17 #include <linux/crypto.h> 17 #include <linux/crypto.h>
18 #include <linux/kernel.h> 18 #include <linux/kernel.h>
19 #include <linux/module.h> 19 #include <linux/module.h>
20 #include <linux/unaligned.h> 20 #include <linux/unaligned.h>
21 21
22 static int crypto_poly1305_init(struct shash_d 22 static int crypto_poly1305_init(struct shash_desc *desc)
23 { 23 {
24 struct poly1305_desc_ctx *dctx = shash 24 struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
25 25
26 poly1305_core_init(&dctx->h); 26 poly1305_core_init(&dctx->h);
27 dctx->buflen = 0; 27 dctx->buflen = 0;
28 dctx->rset = 0; 28 dctx->rset = 0;
29 dctx->sset = false; 29 dctx->sset = false;
30 30
31 return 0; 31 return 0;
32 } 32 }
33 33
34 static unsigned int crypto_poly1305_setdesckey 34 static unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
35 35 const u8 *src, unsigned int srclen)
36 { 36 {
37 if (!dctx->sset) { 37 if (!dctx->sset) {
38 if (!dctx->rset && srclen >= P 38 if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
39 poly1305_core_setkey(& 39 poly1305_core_setkey(&dctx->core_r, src);
40 src += POLY1305_BLOCK_ 40 src += POLY1305_BLOCK_SIZE;
41 srclen -= POLY1305_BLO 41 srclen -= POLY1305_BLOCK_SIZE;
42 dctx->rset = 2; 42 dctx->rset = 2;
43 } 43 }
44 if (srclen >= POLY1305_BLOCK_S 44 if (srclen >= POLY1305_BLOCK_SIZE) {
45 dctx->s[0] = get_unali 45 dctx->s[0] = get_unaligned_le32(src + 0);
46 dctx->s[1] = get_unali 46 dctx->s[1] = get_unaligned_le32(src + 4);
47 dctx->s[2] = get_unali 47 dctx->s[2] = get_unaligned_le32(src + 8);
48 dctx->s[3] = get_unali 48 dctx->s[3] = get_unaligned_le32(src + 12);
49 src += POLY1305_BLOCK_ 49 src += POLY1305_BLOCK_SIZE;
50 srclen -= POLY1305_BLO 50 srclen -= POLY1305_BLOCK_SIZE;
51 dctx->sset = true; 51 dctx->sset = true;
52 } 52 }
53 } 53 }
54 return srclen; 54 return srclen;
55 } 55 }
56 56
57 static void poly1305_blocks(struct poly1305_de 57 static void poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src,
58 unsigned int srcle 58 unsigned int srclen)
59 { 59 {
60 unsigned int datalen; 60 unsigned int datalen;
61 61
62 if (unlikely(!dctx->sset)) { 62 if (unlikely(!dctx->sset)) {
63 datalen = crypto_poly1305_setd 63 datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
64 src += srclen - datalen; 64 src += srclen - datalen;
65 srclen = datalen; 65 srclen = datalen;
66 } 66 }
67 67
68 poly1305_core_blocks(&dctx->h, &dctx-> 68 poly1305_core_blocks(&dctx->h, &dctx->core_r, src,
69 srclen / POLY1305 69 srclen / POLY1305_BLOCK_SIZE, 1);
70 } 70 }
71 71
72 static int crypto_poly1305_update(struct shash 72 static int crypto_poly1305_update(struct shash_desc *desc,
73 const u8 *sr 73 const u8 *src, unsigned int srclen)
74 { 74 {
75 struct poly1305_desc_ctx *dctx = shash 75 struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
76 unsigned int bytes; 76 unsigned int bytes;
77 77
78 if (unlikely(dctx->buflen)) { 78 if (unlikely(dctx->buflen)) {
79 bytes = min(srclen, POLY1305_B 79 bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
80 memcpy(dctx->buf + dctx->bufle 80 memcpy(dctx->buf + dctx->buflen, src, bytes);
81 src += bytes; 81 src += bytes;
82 srclen -= bytes; 82 srclen -= bytes;
83 dctx->buflen += bytes; 83 dctx->buflen += bytes;
84 84
85 if (dctx->buflen == POLY1305_B 85 if (dctx->buflen == POLY1305_BLOCK_SIZE) {
86 poly1305_blocks(dctx, 86 poly1305_blocks(dctx, dctx->buf,
87 POLY13 87 POLY1305_BLOCK_SIZE);
88 dctx->buflen = 0; 88 dctx->buflen = 0;
89 } 89 }
90 } 90 }
91 91
92 if (likely(srclen >= POLY1305_BLOCK_SI 92 if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
93 poly1305_blocks(dctx, src, src 93 poly1305_blocks(dctx, src, srclen);
94 src += srclen - (srclen % POLY 94 src += srclen - (srclen % POLY1305_BLOCK_SIZE);
95 srclen %= POLY1305_BLOCK_SIZE; 95 srclen %= POLY1305_BLOCK_SIZE;
96 } 96 }
97 97
98 if (unlikely(srclen)) { 98 if (unlikely(srclen)) {
99 dctx->buflen = srclen; 99 dctx->buflen = srclen;
100 memcpy(dctx->buf, src, srclen) 100 memcpy(dctx->buf, src, srclen);
101 } 101 }
102 102
103 return 0; 103 return 0;
104 } 104 }
105 105
106 static int crypto_poly1305_final(struct shash_ 106 static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
107 { 107 {
108 struct poly1305_desc_ctx *dctx = shash 108 struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
109 109
110 if (unlikely(!dctx->sset)) 110 if (unlikely(!dctx->sset))
111 return -ENOKEY; 111 return -ENOKEY;
112 112
113 poly1305_final_generic(dctx, dst); 113 poly1305_final_generic(dctx, dst);
114 return 0; 114 return 0;
115 } 115 }
116 116
117 static struct shash_alg poly1305_alg = { 117 static struct shash_alg poly1305_alg = {
118 .digestsize = POLY1305_DIGEST_SIZE 118 .digestsize = POLY1305_DIGEST_SIZE,
119 .init = crypto_poly1305_init 119 .init = crypto_poly1305_init,
120 .update = crypto_poly1305_upda 120 .update = crypto_poly1305_update,
121 .final = crypto_poly1305_fina 121 .final = crypto_poly1305_final,
122 .descsize = sizeof(struct poly13 122 .descsize = sizeof(struct poly1305_desc_ctx),
123 .base = { 123 .base = {
124 .cra_name = "pol 124 .cra_name = "poly1305",
125 .cra_driver_name = "pol 125 .cra_driver_name = "poly1305-generic",
126 .cra_priority = 100, 126 .cra_priority = 100,
127 .cra_blocksize = POLY 127 .cra_blocksize = POLY1305_BLOCK_SIZE,
128 .cra_module = THIS 128 .cra_module = THIS_MODULE,
129 }, 129 },
130 }; 130 };
131 131
132 static int __init poly1305_mod_init(void) 132 static int __init poly1305_mod_init(void)
133 { 133 {
134 return crypto_register_shash(&poly1305 134 return crypto_register_shash(&poly1305_alg);
135 } 135 }
136 136
137 static void __exit poly1305_mod_exit(void) 137 static void __exit poly1305_mod_exit(void)
138 { 138 {
139 crypto_unregister_shash(&poly1305_alg) 139 crypto_unregister_shash(&poly1305_alg);
140 } 140 }
141 141
142 subsys_initcall(poly1305_mod_init); 142 subsys_initcall(poly1305_mod_init);
143 module_exit(poly1305_mod_exit); 143 module_exit(poly1305_mod_exit);
144 144
145 MODULE_LICENSE("GPL"); 145 MODULE_LICENSE("GPL");
146 MODULE_AUTHOR("Martin Willi <martin@strongswan 146 MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
147 MODULE_DESCRIPTION("Poly1305 authenticator"); 147 MODULE_DESCRIPTION("Poly1305 authenticator");
148 MODULE_ALIAS_CRYPTO("poly1305"); 148 MODULE_ALIAS_CRYPTO("poly1305");
149 MODULE_ALIAS_CRYPTO("poly1305-generic"); 149 MODULE_ALIAS_CRYPTO("poly1305-generic");
150 150
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