1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
3 *
4 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
5 *
6 * Copyright (c) Alan Smithee.
7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
8 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
9 * Copyright (c) Mathias Krause <minipli@googlemail.com>
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <crypto/internal/hash.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/mm.h>
18 #include <linux/types.h>
19 #include <crypto/sha1.h>
20 #include <crypto/sha1_base.h>
21
22 #include <asm/pstate.h>
23 #include <asm/elf.h>
24
25 #include "opcodes.h"
26
27 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
28 unsigned int rounds);
29
30 static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
31 unsigned int len, unsigned int partial)
32 {
33 unsigned int done = 0;
34
35 sctx->count += len;
36 if (partial) {
37 done = SHA1_BLOCK_SIZE - partial;
38 memcpy(sctx->buffer + partial, data, done);
39 sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
40 }
41 if (len - done >= SHA1_BLOCK_SIZE) {
42 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
43
44 sha1_sparc64_transform(sctx->state, data + done, rounds);
45 done += rounds * SHA1_BLOCK_SIZE;
46 }
47
48 memcpy(sctx->buffer, data + done, len - done);
49 }
50
51 static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
52 unsigned int len)
53 {
54 struct sha1_state *sctx = shash_desc_ctx(desc);
55 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
56
57 /* Handle the fast case right here */
58 if (partial + len < SHA1_BLOCK_SIZE) {
59 sctx->count += len;
60 memcpy(sctx->buffer + partial, data, len);
61 } else
62 __sha1_sparc64_update(sctx, data, len, partial);
63
64 return 0;
65 }
66
67 /* Add padding and return the message digest. */
68 static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
69 {
70 struct sha1_state *sctx = shash_desc_ctx(desc);
71 unsigned int i, index, padlen;
72 __be32 *dst = (__be32 *)out;
73 __be64 bits;
74 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
75
76 bits = cpu_to_be64(sctx->count << 3);
77
78 /* Pad out to 56 mod 64 and append length */
79 index = sctx->count % SHA1_BLOCK_SIZE;
80 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
81
82 /* We need to fill a whole block for __sha1_sparc64_update() */
83 if (padlen <= 56) {
84 sctx->count += padlen;
85 memcpy(sctx->buffer + index, padding, padlen);
86 } else {
87 __sha1_sparc64_update(sctx, padding, padlen, index);
88 }
89 __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
90
91 /* Store state in digest */
92 for (i = 0; i < 5; i++)
93 dst[i] = cpu_to_be32(sctx->state[i]);
94
95 /* Wipe context */
96 memset(sctx, 0, sizeof(*sctx));
97
98 return 0;
99 }
100
101 static int sha1_sparc64_export(struct shash_desc *desc, void *out)
102 {
103 struct sha1_state *sctx = shash_desc_ctx(desc);
104
105 memcpy(out, sctx, sizeof(*sctx));
106
107 return 0;
108 }
109
110 static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
111 {
112 struct sha1_state *sctx = shash_desc_ctx(desc);
113
114 memcpy(sctx, in, sizeof(*sctx));
115
116 return 0;
117 }
118
119 static struct shash_alg alg = {
120 .digestsize = SHA1_DIGEST_SIZE,
121 .init = sha1_base_init,
122 .update = sha1_sparc64_update,
123 .final = sha1_sparc64_final,
124 .export = sha1_sparc64_export,
125 .import = sha1_sparc64_import,
126 .descsize = sizeof(struct sha1_state),
127 .statesize = sizeof(struct sha1_state),
128 .base = {
129 .cra_name = "sha1",
130 .cra_driver_name= "sha1-sparc64",
131 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
132 .cra_blocksize = SHA1_BLOCK_SIZE,
133 .cra_module = THIS_MODULE,
134 }
135 };
136
137 static bool __init sparc64_has_sha1_opcode(void)
138 {
139 unsigned long cfr;
140
141 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
142 return false;
143
144 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
145 if (!(cfr & CFR_SHA1))
146 return false;
147
148 return true;
149 }
150
151 static int __init sha1_sparc64_mod_init(void)
152 {
153 if (sparc64_has_sha1_opcode()) {
154 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
155 return crypto_register_shash(&alg);
156 }
157 pr_info("sparc64 sha1 opcode not available.\n");
158 return -ENODEV;
159 }
160
161 static void __exit sha1_sparc64_mod_fini(void)
162 {
163 crypto_unregister_shash(&alg);
164 }
165
166 module_init(sha1_sparc64_mod_init);
167 module_exit(sha1_sparc64_mod_fini);
168
169 MODULE_LICENSE("GPL");
170 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
171
172 MODULE_ALIAS_CRYPTO("sha1");
173
174 #include "crop_devid.c"
175
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