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(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, padding, padlen);
75
76 /* Append length */
77 powerpc_sha1_update(desc, (const u8 *)&bits, 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);
125 }
126
127 static void __exit sha1_powerpc_mod_fini(void)
128 {
129 crypto_unregister_shash(&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
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