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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
775e0c69 DM |
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> | |
775e0c69 | 17 | #include <linux/types.h> |
a24d22b2 | 18 | #include <crypto/sha2.h> |
e0583b6a | 19 | #include <crypto/sha512_base.h> |
775e0c69 DM |
20 | |
21 | #include <asm/pstate.h> | |
22 | #include <asm/elf.h> | |
23 | ||
10803624 DM |
24 | #include "opcodes.h" |
25 | ||
775e0c69 DM |
26 | asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data, |
27 | unsigned int rounds); | |
28 | ||
775e0c69 DM |
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); | |
8202cd72 | 111 | memzero_explicit(D, 64); |
775e0c69 DM |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static struct shash_alg sha512 = { | |
117 | .digestsize = SHA512_DIGEST_SIZE, | |
e0583b6a | 118 | .init = sha512_base_init, |
775e0c69 DM |
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", | |
10803624 | 125 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
775e0c69 DM |
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, | |
e0583b6a | 133 | .init = sha384_base_init, |
775e0c69 DM |
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", | |
10803624 | 140 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
775e0c69 DM |
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 | ||
5d26a105 KC |
192 | MODULE_ALIAS_CRYPTO("sha384"); |
193 | MODULE_ALIAS_CRYPTO("sha512"); | |
226f7cea DM |
194 | |
195 | #include "crop_devid.c" |