1 /* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
2 *
3 * This is based largely upon crypto/sha512_generic.c
4 *
5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
7 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
8 */
9
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12 #include <crypto/internal/hash.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/mm.h>
16 #include <linux/cryptohash.h>
17 #include <linux/types.h>
18 #include <crypto/sha.h>
19
20 #include <asm/pstate.h>
21 #include <asm/elf.h>
22
23 #include "opcodes.h"
24
25 asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
26 unsigned int rounds);
27
sha512_sparc64_init(struct shash_desc * desc)28 static int sha512_sparc64_init(struct shash_desc *desc)
29 {
30 struct sha512_state *sctx = shash_desc_ctx(desc);
31 sctx->state[0] = SHA512_H0;
32 sctx->state[1] = SHA512_H1;
33 sctx->state[2] = SHA512_H2;
34 sctx->state[3] = SHA512_H3;
35 sctx->state[4] = SHA512_H4;
36 sctx->state[5] = SHA512_H5;
37 sctx->state[6] = SHA512_H6;
38 sctx->state[7] = SHA512_H7;
39 sctx->count[0] = sctx->count[1] = 0;
40
41 return 0;
42 }
43
sha384_sparc64_init(struct shash_desc * desc)44 static int sha384_sparc64_init(struct shash_desc *desc)
45 {
46 struct sha512_state *sctx = shash_desc_ctx(desc);
47 sctx->state[0] = SHA384_H0;
48 sctx->state[1] = SHA384_H1;
49 sctx->state[2] = SHA384_H2;
50 sctx->state[3] = SHA384_H3;
51 sctx->state[4] = SHA384_H4;
52 sctx->state[5] = SHA384_H5;
53 sctx->state[6] = SHA384_H6;
54 sctx->state[7] = SHA384_H7;
55 sctx->count[0] = sctx->count[1] = 0;
56
57 return 0;
58 }
59
__sha512_sparc64_update(struct sha512_state * sctx,const u8 * data,unsigned int len,unsigned int partial)60 static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
61 unsigned int len, unsigned int partial)
62 {
63 unsigned int done = 0;
64
65 if ((sctx->count[0] += len) < len)
66 sctx->count[1]++;
67 if (partial) {
68 done = SHA512_BLOCK_SIZE - partial;
69 memcpy(sctx->buf + partial, data, done);
70 sha512_sparc64_transform(sctx->state, sctx->buf, 1);
71 }
72 if (len - done >= SHA512_BLOCK_SIZE) {
73 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
74
75 sha512_sparc64_transform(sctx->state, data + done, rounds);
76 done += rounds * SHA512_BLOCK_SIZE;
77 }
78
79 memcpy(sctx->buf, data + done, len - done);
80 }
81
sha512_sparc64_update(struct shash_desc * desc,const u8 * data,unsigned int len)82 static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
83 unsigned int len)
84 {
85 struct sha512_state *sctx = shash_desc_ctx(desc);
86 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
87
88 /* Handle the fast case right here */
89 if (partial + len < SHA512_BLOCK_SIZE) {
90 if ((sctx->count[0] += len) < len)
91 sctx->count[1]++;
92 memcpy(sctx->buf + partial, data, len);
93 } else
94 __sha512_sparc64_update(sctx, data, len, partial);
95
96 return 0;
97 }
98
sha512_sparc64_final(struct shash_desc * desc,u8 * out)99 static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
100 {
101 struct sha512_state *sctx = shash_desc_ctx(desc);
102 unsigned int i, index, padlen;
103 __be64 *dst = (__be64 *)out;
104 __be64 bits[2];
105 static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
106
107 /* Save number of bits */
108 bits[1] = cpu_to_be64(sctx->count[0] << 3);
109 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
110
111 /* Pad out to 112 mod 128 and append length */
112 index = sctx->count[0] % SHA512_BLOCK_SIZE;
113 padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);
114
115 /* We need to fill a whole block for __sha512_sparc64_update() */
116 if (padlen <= 112) {
117 if ((sctx->count[0] += padlen) < padlen)
118 sctx->count[1]++;
119 memcpy(sctx->buf + index, padding, padlen);
120 } else {
121 __sha512_sparc64_update(sctx, padding, padlen, index);
122 }
123 __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);
124
125 /* Store state in digest */
126 for (i = 0; i < 8; i++)
127 dst[i] = cpu_to_be64(sctx->state[i]);
128
129 /* Wipe context */
130 memset(sctx, 0, sizeof(*sctx));
131
132 return 0;
133 }
134
sha384_sparc64_final(struct shash_desc * desc,u8 * hash)135 static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
136 {
137 u8 D[64];
138
139 sha512_sparc64_final(desc, D);
140
141 memcpy(hash, D, 48);
142 memzero_explicit(D, 64);
143
144 return 0;
145 }
146
147 static struct shash_alg sha512 = {
148 .digestsize = SHA512_DIGEST_SIZE,
149 .init = sha512_sparc64_init,
150 .update = sha512_sparc64_update,
151 .final = sha512_sparc64_final,
152 .descsize = sizeof(struct sha512_state),
153 .base = {
154 .cra_name = "sha512",
155 .cra_driver_name= "sha512-sparc64",
156 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
157 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
158 .cra_blocksize = SHA512_BLOCK_SIZE,
159 .cra_module = THIS_MODULE,
160 }
161 };
162
163 static struct shash_alg sha384 = {
164 .digestsize = SHA384_DIGEST_SIZE,
165 .init = sha384_sparc64_init,
166 .update = sha512_sparc64_update,
167 .final = sha384_sparc64_final,
168 .descsize = sizeof(struct sha512_state),
169 .base = {
170 .cra_name = "sha384",
171 .cra_driver_name= "sha384-sparc64",
172 .cra_priority = SPARC_CR_OPCODE_PRIORITY,
173 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
174 .cra_blocksize = SHA384_BLOCK_SIZE,
175 .cra_module = THIS_MODULE,
176 }
177 };
178
sparc64_has_sha512_opcode(void)179 static bool __init sparc64_has_sha512_opcode(void)
180 {
181 unsigned long cfr;
182
183 if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
184 return false;
185
186 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
187 if (!(cfr & CFR_SHA512))
188 return false;
189
190 return true;
191 }
192
sha512_sparc64_mod_init(void)193 static int __init sha512_sparc64_mod_init(void)
194 {
195 if (sparc64_has_sha512_opcode()) {
196 int ret = crypto_register_shash(&sha384);
197 if (ret < 0)
198 return ret;
199
200 ret = crypto_register_shash(&sha512);
201 if (ret < 0) {
202 crypto_unregister_shash(&sha384);
203 return ret;
204 }
205
206 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
207 return 0;
208 }
209 pr_info("sparc64 sha512 opcode not available.\n");
210 return -ENODEV;
211 }
212
sha512_sparc64_mod_fini(void)213 static void __exit sha512_sparc64_mod_fini(void)
214 {
215 crypto_unregister_shash(&sha384);
216 crypto_unregister_shash(&sha512);
217 }
218
219 module_init(sha512_sparc64_mod_init);
220 module_exit(sha512_sparc64_mod_fini);
221
222 MODULE_LICENSE("GPL");
223 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
224
225 MODULE_ALIAS_CRYPTO("sha384");
226 MODULE_ALIAS_CRYPTO("sha512");
227
228 #include "crop_devid.c"
229