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Linux/arch/powerpc/crypto/sha1-spe-glue.c

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  1 /*
  2  * Glue code for SHA-1 implementation for SPE instructions (PPC)
  3  *
  4  * Based on generic implementation.
  5  *
  6  * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the Free
 10  * Software Foundation; either version 2 of the License, or (at your option)
 11  * any later version.
 12  *
 13  */
 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/cryptohash.h>
 20 #include <linux/types.h>
 21 #include <crypto/sha.h>
 22 #include <asm/byteorder.h>
 23 #include <asm/switch_to.h>
 24 #include <linux/hardirq.h>
 25 
 26 /*
 27  * MAX_BYTES defines the number of bytes that are allowed to be processed
 28  * between preempt_disable() and preempt_enable(). SHA1 takes ~1000
 29  * operations per 64 bytes. e500 cores can issue two arithmetic instructions
 30  * per clock cycle using one 32/64 bit unit (SU1) and one 32 bit unit (SU2).
 31  * Thus 2KB of input data will need an estimated maximum of 18,000 cycles.
 32  * Headroom for cache misses included. Even with the low end model clocked
 33  * at 667 MHz this equals to a critical time window of less than 27us.
 34  *
 35  */
 36 #define MAX_BYTES 2048
 37 
 38 extern void ppc_spe_sha1_transform(u32 *state, const u8 *src, u32 blocks);
 39 
 40 static void spe_begin(void)
 41 {
 42         /* We just start SPE operations and will save SPE registers later. */
 43         preempt_disable();
 44         enable_kernel_spe();
 45 }
 46 
 47 static void spe_end(void)
 48 {
 49         disable_kernel_spe();
 50         /* reenable preemption */
 51         preempt_enable();
 52 }
 53 
 54 static inline void ppc_sha1_clear_context(struct sha1_state *sctx)
 55 {
 56         int count = sizeof(struct sha1_state) >> 2;
 57         u32 *ptr = (u32 *)sctx;
 58 
 59         /* make sure we can clear the fast way */
 60         BUILD_BUG_ON(sizeof(struct sha1_state) % 4);
 61         do { *ptr++ = 0; } while (--count);
 62 }
 63 
 64 static int ppc_spe_sha1_init(struct shash_desc *desc)
 65 {
 66         struct sha1_state *sctx = shash_desc_ctx(desc);
 67 
 68         sctx->state[0] = SHA1_H0;
 69         sctx->state[1] = SHA1_H1;
 70         sctx->state[2] = SHA1_H2;
 71         sctx->state[3] = SHA1_H3;
 72         sctx->state[4] = SHA1_H4;
 73         sctx->count = 0;
 74 
 75         return 0;
 76 }
 77 
 78 static int ppc_spe_sha1_update(struct shash_desc *desc, const u8 *data,
 79                         unsigned int len)
 80 {
 81         struct sha1_state *sctx = shash_desc_ctx(desc);
 82         const unsigned int offset = sctx->count & 0x3f;
 83         const unsigned int avail = 64 - offset;
 84         unsigned int bytes;
 85         const u8 *src = data;
 86 
 87         if (avail > len) {
 88                 sctx->count += len;
 89                 memcpy((char *)sctx->buffer + offset, src, len);
 90                 return 0;
 91         }
 92 
 93         sctx->count += len;
 94 
 95         if (offset) {
 96                 memcpy((char *)sctx->buffer + offset, src, avail);
 97 
 98                 spe_begin();
 99                 ppc_spe_sha1_transform(sctx->state, (const u8 *)sctx->buffer, 1);
100                 spe_end();
101 
102                 len -= avail;
103                 src += avail;
104         }
105 
106         while (len > 63) {
107                 bytes = (len > MAX_BYTES) ? MAX_BYTES : len;
108                 bytes = bytes & ~0x3f;
109 
110                 spe_begin();
111                 ppc_spe_sha1_transform(sctx->state, src, bytes >> 6);
112                 spe_end();
113 
114                 src += bytes;
115                 len -= bytes;
116         };
117 
118         memcpy((char *)sctx->buffer, src, len);
119         return 0;
120 }
121 
122 static int ppc_spe_sha1_final(struct shash_desc *desc, u8 *out)
123 {
124         struct sha1_state *sctx = shash_desc_ctx(desc);
125         const unsigned int offset = sctx->count & 0x3f;
126         char *p = (char *)sctx->buffer + offset;
127         int padlen;
128         __be64 *pbits = (__be64 *)(((char *)&sctx->buffer) + 56);
129         __be32 *dst = (__be32 *)out;
130 
131         padlen = 55 - offset;
132         *p++ = 0x80;
133 
134         spe_begin();
135 
136         if (padlen < 0) {
137                 memset(p, 0x00, padlen + sizeof (u64));
138                 ppc_spe_sha1_transform(sctx->state, sctx->buffer, 1);
139                 p = (char *)sctx->buffer;
140                 padlen = 56;
141         }
142 
143         memset(p, 0, padlen);
144         *pbits = cpu_to_be64(sctx->count << 3);
145         ppc_spe_sha1_transform(sctx->state, sctx->buffer, 1);
146 
147         spe_end();
148 
149         dst[0] = cpu_to_be32(sctx->state[0]);
150         dst[1] = cpu_to_be32(sctx->state[1]);
151         dst[2] = cpu_to_be32(sctx->state[2]);
152         dst[3] = cpu_to_be32(sctx->state[3]);
153         dst[4] = cpu_to_be32(sctx->state[4]);
154 
155         ppc_sha1_clear_context(sctx);
156         return 0;
157 }
158 
159 static int ppc_spe_sha1_export(struct shash_desc *desc, void *out)
160 {
161         struct sha1_state *sctx = shash_desc_ctx(desc);
162 
163         memcpy(out, sctx, sizeof(*sctx));
164         return 0;
165 }
166 
167 static int ppc_spe_sha1_import(struct shash_desc *desc, const void *in)
168 {
169         struct sha1_state *sctx = shash_desc_ctx(desc);
170 
171         memcpy(sctx, in, sizeof(*sctx));
172         return 0;
173 }
174 
175 static struct shash_alg alg = {
176         .digestsize     =       SHA1_DIGEST_SIZE,
177         .init           =       ppc_spe_sha1_init,
178         .update         =       ppc_spe_sha1_update,
179         .final          =       ppc_spe_sha1_final,
180         .export         =       ppc_spe_sha1_export,
181         .import         =       ppc_spe_sha1_import,
182         .descsize       =       sizeof(struct sha1_state),
183         .statesize      =       sizeof(struct sha1_state),
184         .base           =       {
185                 .cra_name       =       "sha1",
186                 .cra_driver_name=       "sha1-ppc-spe",
187                 .cra_priority   =       300,
188                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
189                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
190                 .cra_module     =       THIS_MODULE,
191         }
192 };
193 
194 static int __init ppc_spe_sha1_mod_init(void)
195 {
196         return crypto_register_shash(&alg);
197 }
198 
199 static void __exit ppc_spe_sha1_mod_fini(void)
200 {
201         crypto_unregister_shash(&alg);
202 }
203 
204 module_init(ppc_spe_sha1_mod_init);
205 module_exit(ppc_spe_sha1_mod_fini);
206 
207 MODULE_LICENSE("GPL");
208 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, SPE optimized");
209 
210 MODULE_ALIAS_CRYPTO("sha1");
211 MODULE_ALIAS_CRYPTO("sha1-ppc-spe");
212 

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