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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
24void powerpc_sha_transform(u32 *state, const u8 *src);
25
26static 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. */
61static 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
89static 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
97static 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
105static 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
122static int __init sha1_powerpc_mod_init(void)
123{
124 return crypto_register_shash(&alg);
125}
126
127static void __exit sha1_powerpc_mod_fini(void)
128{
129 crypto_unregister_shash(&alg);
130}
131
132module_init(sha1_powerpc_mod_init);
133module_exit(sha1_powerpc_mod_fini);
134
135MODULE_LICENSE("GPL");
136MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
137
138MODULE_ALIAS_CRYPTO("sha1");
139MODULE_ALIAS_CRYPTO("sha1-powerpc");
1/*
2 * Cryptographic API.
3 *
4 * powerpc implementation of the SHA1 Secure Hash Algorithm.
5 *
6 * Derived from cryptoapi implementation, adapted for in-place
7 * scatterlist interface.
8 *
9 * Derived from "crypto/sha1.c"
10 * Copyright (c) Alan Smithee.
11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
12 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the Free
16 * Software Foundation; either version 2 of the License, or (at your option)
17 * any later version.
18 *
19 */
20#include <crypto/internal/hash.h>
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/mm.h>
24#include <linux/cryptohash.h>
25#include <linux/types.h>
26#include <crypto/sha.h>
27#include <asm/byteorder.h>
28
29extern void powerpc_sha_transform(u32 *state, const u8 *src, u32 *temp);
30
31static int sha1_init(struct shash_desc *desc)
32{
33 struct sha1_state *sctx = shash_desc_ctx(desc);
34
35 *sctx = (struct sha1_state){
36 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
37 };
38
39 return 0;
40}
41
42static int sha1_update(struct shash_desc *desc, const u8 *data,
43 unsigned int len)
44{
45 struct sha1_state *sctx = shash_desc_ctx(desc);
46 unsigned int partial, done;
47 const u8 *src;
48
49 partial = sctx->count & 0x3f;
50 sctx->count += len;
51 done = 0;
52 src = data;
53
54 if ((partial + len) > 63) {
55 u32 temp[SHA_WORKSPACE_WORDS];
56
57 if (partial) {
58 done = -partial;
59 memcpy(sctx->buffer + partial, data, done + 64);
60 src = sctx->buffer;
61 }
62
63 do {
64 powerpc_sha_transform(sctx->state, src, temp);
65 done += 64;
66 src = data + done;
67 } while (done + 63 < len);
68
69 memzero_explicit(temp, sizeof(temp));
70 partial = 0;
71 }
72 memcpy(sctx->buffer + partial, src, len - done);
73
74 return 0;
75}
76
77
78/* Add padding and return the message digest. */
79static int sha1_final(struct shash_desc *desc, u8 *out)
80{
81 struct sha1_state *sctx = shash_desc_ctx(desc);
82 __be32 *dst = (__be32 *)out;
83 u32 i, index, padlen;
84 __be64 bits;
85 static const u8 padding[64] = { 0x80, };
86
87 bits = cpu_to_be64(sctx->count << 3);
88
89 /* Pad out to 56 mod 64 */
90 index = sctx->count & 0x3f;
91 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
92 sha1_update(desc, padding, padlen);
93
94 /* Append length */
95 sha1_update(desc, (const u8 *)&bits, sizeof(bits));
96
97 /* Store state in digest */
98 for (i = 0; i < 5; i++)
99 dst[i] = cpu_to_be32(sctx->state[i]);
100
101 /* Wipe context */
102 memset(sctx, 0, sizeof *sctx);
103
104 return 0;
105}
106
107static int sha1_export(struct shash_desc *desc, void *out)
108{
109 struct sha1_state *sctx = shash_desc_ctx(desc);
110
111 memcpy(out, sctx, sizeof(*sctx));
112 return 0;
113}
114
115static int sha1_import(struct shash_desc *desc, const void *in)
116{
117 struct sha1_state *sctx = shash_desc_ctx(desc);
118
119 memcpy(sctx, in, sizeof(*sctx));
120 return 0;
121}
122
123static struct shash_alg alg = {
124 .digestsize = SHA1_DIGEST_SIZE,
125 .init = sha1_init,
126 .update = sha1_update,
127 .final = sha1_final,
128 .export = sha1_export,
129 .import = sha1_import,
130 .descsize = sizeof(struct sha1_state),
131 .statesize = sizeof(struct sha1_state),
132 .base = {
133 .cra_name = "sha1",
134 .cra_driver_name= "sha1-powerpc",
135 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
136 .cra_blocksize = SHA1_BLOCK_SIZE,
137 .cra_module = THIS_MODULE,
138 }
139};
140
141static int __init sha1_powerpc_mod_init(void)
142{
143 return crypto_register_shash(&alg);
144}
145
146static void __exit sha1_powerpc_mod_fini(void)
147{
148 crypto_unregister_shash(&alg);
149}
150
151module_init(sha1_powerpc_mod_init);
152module_exit(sha1_powerpc_mod_fini);
153
154MODULE_LICENSE("GPL");
155MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
156
157MODULE_ALIAS_CRYPTO("sha1");
158MODULE_ALIAS_CRYPTO("sha1-powerpc");