1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Cryptographic API. |
4 | * |
5 | * powerpc implementation of the SHA1 Secure Hash Algorithm. |
6 | * |
7 | * Derived from cryptoapi implementation, adapted for in-place |
8 | * scatterlist interface. |
9 | * |
10 | * Derived from "crypto/sha1.c" |
11 | * Copyright (c) Alan Smithee. |
12 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> |
13 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> |
14 | */ |
15 | #include <crypto/internal/hash.h> |
16 | #include <linux/init.h> |
17 | #include <linux/module.h> |
18 | #include <linux/mm.h> |
19 | #include <linux/types.h> |
20 | #include <crypto/sha1.h> |
21 | #include <crypto/sha1_base.h> |
22 | #include <asm/byteorder.h> |
23 | |
24 | void powerpc_sha_transform(u32 *state, const u8 *src); |
25 | |
26 | static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data, |
27 | unsigned int len) |
28 | { |
29 | struct sha1_state *sctx = shash_desc_ctx(desc); |
30 | unsigned int partial, done; |
31 | const u8 *src; |
32 | |
33 | partial = sctx->count & 0x3f; |
34 | sctx->count += len; |
35 | done = 0; |
36 | src = data; |
37 | |
38 | if ((partial + len) > 63) { |
39 | |
40 | if (partial) { |
41 | done = -partial; |
42 | memcpy(sctx->buffer + partial, data, done + 64); |
43 | src = sctx->buffer; |
44 | } |
45 | |
46 | do { |
47 | powerpc_sha_transform(state: sctx->state, src); |
48 | done += 64; |
49 | src = data + done; |
50 | } while (done + 63 < len); |
51 | |
52 | partial = 0; |
53 | } |
54 | memcpy(sctx->buffer + partial, src, len - done); |
55 | |
56 | return 0; |
57 | } |
58 | |
59 | |
60 | /* Add padding and return the message digest. */ |
61 | static int powerpc_sha1_final(struct shash_desc *desc, u8 *out) |
62 | { |
63 | struct sha1_state *sctx = shash_desc_ctx(desc); |
64 | __be32 *dst = (__be32 *)out; |
65 | u32 i, index, padlen; |
66 | __be64 bits; |
67 | static const u8 padding[64] = { 0x80, }; |
68 | |
69 | bits = cpu_to_be64(sctx->count << 3); |
70 | |
71 | /* Pad out to 56 mod 64 */ |
72 | index = sctx->count & 0x3f; |
73 | padlen = (index < 56) ? (56 - index) : ((64+56) - index); |
74 | powerpc_sha1_update(desc, data: padding, len: padlen); |
75 | |
76 | /* Append length */ |
77 | powerpc_sha1_update(desc, data: (const u8 *)&bits, len: sizeof(bits)); |
78 | |
79 | /* Store state in digest */ |
80 | for (i = 0; i < 5; i++) |
81 | dst[i] = cpu_to_be32(sctx->state[i]); |
82 | |
83 | /* Wipe context */ |
84 | memset(sctx, 0, sizeof *sctx); |
85 | |
86 | return 0; |
87 | } |
88 | |
89 | static int powerpc_sha1_export(struct shash_desc *desc, void *out) |
90 | { |
91 | struct sha1_state *sctx = shash_desc_ctx(desc); |
92 | |
93 | memcpy(out, sctx, sizeof(*sctx)); |
94 | return 0; |
95 | } |
96 | |
97 | static int powerpc_sha1_import(struct shash_desc *desc, const void *in) |
98 | { |
99 | struct sha1_state *sctx = shash_desc_ctx(desc); |
100 | |
101 | memcpy(sctx, in, sizeof(*sctx)); |
102 | return 0; |
103 | } |
104 | |
105 | static struct shash_alg alg = { |
106 | .digestsize = SHA1_DIGEST_SIZE, |
107 | .init = sha1_base_init, |
108 | .update = powerpc_sha1_update, |
109 | .final = powerpc_sha1_final, |
110 | .export = powerpc_sha1_export, |
111 | .import = powerpc_sha1_import, |
112 | .descsize = sizeof(struct sha1_state), |
113 | .statesize = sizeof(struct sha1_state), |
114 | .base = { |
115 | .cra_name = "sha1" , |
116 | .cra_driver_name= "sha1-powerpc" , |
117 | .cra_blocksize = SHA1_BLOCK_SIZE, |
118 | .cra_module = THIS_MODULE, |
119 | } |
120 | }; |
121 | |
122 | static int __init sha1_powerpc_mod_init(void) |
123 | { |
124 | return crypto_register_shash(alg: &alg); |
125 | } |
126 | |
127 | static void __exit sha1_powerpc_mod_fini(void) |
128 | { |
129 | crypto_unregister_shash(alg: &alg); |
130 | } |
131 | |
132 | module_init(sha1_powerpc_mod_init); |
133 | module_exit(sha1_powerpc_mod_fini); |
134 | |
135 | MODULE_LICENSE("GPL" ); |
136 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm" ); |
137 | |
138 | MODULE_ALIAS_CRYPTO("sha1" ); |
139 | MODULE_ALIAS_CRYPTO("sha1-powerpc" ); |
140 | |