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
21 #include <asm/pstate.h>
22 #include <asm/elf.h>
23
24 #include "opcodes.h"
25
26 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
27 unsigned int rounds);
28
sha1_sparc64_init(struct shash_desc * desc)29 static int sha1_sparc64_init(struct shash_desc *desc)
30 {
31 struct sha1_state *sctx = shash_desc_ctx(desc);
32
33 *sctx = (struct sha1_state){
34 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
35 };
36
37 return 0;
38 }
39
__sha1_sparc64_update(struct sha1_state * sctx,const u8 * data,unsigned int len,unsigned int partial)40 static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
41 unsigned int len, unsigned int partial)
42 {
43 unsigned int done = 0;
44
45 sctx->count += len;
46 if (partial) {
47 done = SHA1_BLOCK_SIZE - partial;
48 memcpy(sctx->buffer + partial, data, done);
49 sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
50 }
51 if (len - done >= SHA1_BLOCK_SIZE) {
52 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
53
54 sha1_sparc64_transform(sctx->state, data + done, rounds);
55 done += rounds * SHA1_BLOCK_SIZE;
56 }
57
58 memcpy(sctx->buffer, data + done, len - done);
59 }
60
sha1_sparc64_update(struct shash_desc * desc,const u8 * data,unsigned int len)61 static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
62 unsigned int len)
63 {
64 struct sha1_state *sctx = shash_desc_ctx(desc);
65 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
66
67 /* Handle the fast case right here */
68 if (partial + len < SHA1_BLOCK_SIZE) {
69 sctx->count += len;
70 memcpy(sctx->buffer + partial, data, len);
71 } else
72 __sha1_sparc64_update(sctx, data, len, partial);
73
74 return 0;
75 }
76
77 /* Add padding and return the message digest. */
sha1_sparc64_final(struct shash_desc * desc,u8 * out)78 static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
79 {
80 struct sha1_state *sctx = shash_desc_ctx(desc);
81 unsigned int i, index, padlen;
82 __be32 *dst = (__be32 *)out;
83 __be64 bits;
84 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
85
86 bits = cpu_to_be64(sctx->count << 3);
87
88 /* Pad out to 56 mod 64 and append length */
89 index = sctx->count % SHA1_BLOCK_SIZE;
90 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
91
92 /* We need to fill a whole block for __sha1_sparc64_update() */
93 if (padlen <= 56) {
94 sctx->count += padlen;
95 memcpy(sctx->buffer + index, padding, padlen);
96 } else {
97 __sha1_sparc64_update(sctx, padding, padlen, index);
98 }
99 __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
100
101 /* Store state in digest */
102 for (i = 0; i < 5; i++)
103 dst[i] = cpu_to_be32(sctx->state[i]);
104
105 /* Wipe context */
106 memset(sctx, 0, sizeof(*sctx));
107
108 return 0;
109 }
110
sha1_sparc64_export(struct shash_desc * desc,void * out)111 static int sha1_sparc64_export(struct shash_desc *desc, void *out)
112 {
113 struct sha1_state *sctx = shash_desc_ctx(desc);
114
115 memcpy(out, sctx, sizeof(*sctx));
116
117 return 0;
118 }
119
sha1_sparc64_import(struct shash_desc * desc,const void * in)120 static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
121 {
122 struct sha1_state *sctx = shash_desc_ctx(desc);
123
124 memcpy(sctx, in, sizeof(*sctx));
125
126 return 0;
127 }
128
129 static struct shash_alg alg = {
130 .digestsize = SHA1_DIGEST_SIZE,
131 .init = sha1_sparc64_init,
132 .update = sha1_sparc64_update,
133 .final = sha1_sparc64_final,
134 .export = sha1_sparc64_export,
135 .import = sha1_sparc64_import,
136 .descsize = sizeof(struct sha1_state),
137 .statesize = sizeof(struct sha1_state),
138 .base = {
139 .cra_name = "sha1",
140 .cra_driver_name= "sha1-sparc64",
141 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
142 .cra_blocksize = SHA1_BLOCK_SIZE,
143 .cra_module = THIS_MODULE,
144 }
145 };
146
sparc64_has_sha1_opcode(void)147 static bool __init sparc64_has_sha1_opcode(void)
148 {
149 unsigned long cfr;
150
151 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
152 return false;
153
154 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
155 if (!(cfr & CFR_SHA1))
156 return false;
157
158 return true;
159 }
160
sha1_sparc64_mod_init(void)161 static int __init sha1_sparc64_mod_init(void)
162 {
163 if (sparc64_has_sha1_opcode()) {
164 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
165 return crypto_register_shash(&alg);
166 }
167 pr_info("sparc64 sha1 opcode not available.\n");
168 return -ENODEV;
169 }
170
sha1_sparc64_mod_fini(void)171 static void __exit sha1_sparc64_mod_fini(void)
172 {
173 crypto_unregister_shash(&alg);
174 }
175
176 module_init(sha1_sparc64_mod_init);
177 module_exit(sha1_sparc64_mod_fini);
178
179 MODULE_LICENSE("GPL");
180 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
181
182 MODULE_ALIAS_CRYPTO("sha1");
183
184 #include "crop_devid.c"
185