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(digest: sctx->state, data: sctx->buffer, rounds: 1); |
40 | } |
41 | if (len - done >= SHA1_BLOCK_SIZE) { |
42 | const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; |
43 | |
44 | sha1_sparc64_transform(digest: sctx->state, data: 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, data: padding, len: padlen, partial: index); |
88 | } |
89 | __sha1_sparc64_update(sctx, data: (const u8 *)&bits, len: sizeof(bits), partial: 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: &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: &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 | |