1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
3 *
4 * This is based largely upon crypto/sha512_generic.c
5 *
6 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
8 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <crypto/internal/hash.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/mm.h>
17 #include <linux/types.h>
18 #include <crypto/sha2.h>
19 #include <crypto/sha512_base.h>
20
21 #include <asm/pstate.h>
22 #include <asm/elf.h>
23
24 #include "opcodes.h"
25
26 asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
27 unsigned int rounds);
28
29 static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
30 unsigned int len, unsigned int partial)
31 {
32 unsigned int done = 0;
33
34 if ((sctx->count[0] += len) < len)
35 sctx->count[1]++;
36 if (partial) {
37 done = SHA512_BLOCK_SIZE - partial;
38 memcpy(sctx->buf + partial, data, done);
39 sha512_sparc64_transform(sctx->state, sctx->buf, 1);
40 }
41 if (len - done >= SHA512_BLOCK_SIZE) {
42 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
43
44 sha512_sparc64_transform(sctx->state, data + done, rounds);
45 done += rounds * SHA512_BLOCK_SIZE;
46 }
47
48 memcpy(sctx->buf, data + done, len - done);
49 }
50
51 static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
52 unsigned int len)
53 {
54 struct sha512_state *sctx = shash_desc_ctx(desc);
55 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
56
57 /* Handle the fast case right here */
58 if (partial + len < SHA512_BLOCK_SIZE) {
59 if ((sctx->count[0] += len) < len)
60 sctx->count[1]++;
61 memcpy(sctx->buf + partial, data, len);
62 } else
63 __sha512_sparc64_update(sctx, data, len, partial);
64
65 return 0;
66 }
67
68 static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
69 {
70 struct sha512_state *sctx = shash_desc_ctx(desc);
71 unsigned int i, index, padlen;
72 __be64 *dst = (__be64 *)out;
73 __be64 bits[2];
74 static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
75
76 /* Save number of bits */
77 bits[1] = cpu_to_be64(sctx->count[0] << 3);
78 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
79
80 /* Pad out to 112 mod 128 and append length */
81 index = sctx->count[0] % SHA512_BLOCK_SIZE;
82 padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);
83
84 /* We need to fill a whole block for __sha512_sparc64_update() */
85 if (padlen <= 112) {
86 if ((sctx->count[0] += padlen) < padlen)
87 sctx->count[1]++;
88 memcpy(sctx->buf + index, padding, padlen);
89 } else {
90 __sha512_sparc64_update(sctx, padding, padlen, index);
91 }
92 __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);
93
94 /* Store state in digest */
95 for (i = 0; i < 8; i++)
96 dst[i] = cpu_to_be64(sctx->state[i]);
97
98 /* Wipe context */
99 memset(sctx, 0, sizeof(*sctx));
100
101 return 0;
102 }
103
104 static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
105 {
106 u8 D[64];
107
108 sha512_sparc64_final(desc, D);
109
110 memcpy(hash, D, 48);
111 memzero_explicit(D, 64);
112
113 return 0;
114 }
115
116 static struct shash_alg sha512 = {
117 .digestsize = SHA512_DIGEST_SIZE,
118 .init = sha512_base_init,
119 .update = sha512_sparc64_update,
120 .final = sha512_sparc64_final,
121 .descsize = sizeof(struct sha512_state),
122 .base = {
123 .cra_name = "sha512",
124 .cra_driver_name= "sha512-sparc64",
125 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
126 .cra_blocksize = SHA512_BLOCK_SIZE,
127 .cra_module = THIS_MODULE,
128 }
129 };
130
131 static struct shash_alg sha384 = {
132 .digestsize = SHA384_DIGEST_SIZE,
133 .init = sha384_base_init,
134 .update = sha512_sparc64_update,
135 .final = sha384_sparc64_final,
136 .descsize = sizeof(struct sha512_state),
137 .base = {
138 .cra_name = "sha384",
139 .cra_driver_name= "sha384-sparc64",
140 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
141 .cra_blocksize = SHA384_BLOCK_SIZE,
142 .cra_module = THIS_MODULE,
143 }
144 };
145
146 static bool __init sparc64_has_sha512_opcode(void)
147 {
148 unsigned long cfr;
149
150 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
151 return false;
152
153 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
154 if (!(cfr & CFR_SHA512))
155 return false;
156
157 return true;
158 }
159
160 static int __init sha512_sparc64_mod_init(void)
161 {
162 if (sparc64_has_sha512_opcode()) {
163 int ret = crypto_register_shash(&sha384);
164 if (ret < 0)
165 return ret;
166
167 ret = crypto_register_shash(&sha512);
168 if (ret < 0) {
169 crypto_unregister_shash(&sha384);
170 return ret;
171 }
172
173 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
174 return 0;
175 }
176 pr_info("sparc64 sha512 opcode not available.\n");
177 return -ENODEV;
178 }
179
180 static void __exit sha512_sparc64_mod_fini(void)
181 {
182 crypto_unregister_shash(&sha384);
183 crypto_unregister_shash(&sha512);
184 }
185
186 module_init(sha512_sparc64_mod_init);
187 module_exit(sha512_sparc64_mod_fini);
188
189 MODULE_LICENSE("GPL");
190 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
191
192 MODULE_ALIAS_CRYPTO("sha384");
193 MODULE_ALIAS_CRYPTO("sha512");
194
195 #include "crop_devid.c"
196
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