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(digest: sctx->state, data: sctx->buf, rounds: 1); |
40 | } |
41 | if (len - done >= SHA512_BLOCK_SIZE) { |
42 | const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE; |
43 | |
44 | sha512_sparc64_transform(digest: sctx->state, data: 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, data: padding, len: padlen, partial: index); |
91 | } |
92 | __sha512_sparc64_update(sctx, data: (const u8 *)&bits, len: sizeof(bits), partial: 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, out: D); |
109 | |
110 | memcpy(hash, D, 48); |
111 | memzero_explicit(s: D, count: 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(alg: &sha384); |
164 | if (ret < 0) |
165 | return ret; |
166 | |
167 | ret = crypto_register_shash(alg: &sha512); |
168 | if (ret < 0) { |
169 | crypto_unregister_shash(alg: &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(alg: &sha384); |
183 | crypto_unregister_shash(alg: &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 | |