arch/sparc/crypto/sha1_glue.c

   1 /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
   2  *
   3  * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
   4  *
   5  * Copyright (c) Alan Smithee.
   6  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   7  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
   8  * Copyright (c) Mathias Krause <minipli@googlemail.com>
   9  */
  10
  11 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  12
  13 #include <crypto/internal/hash.h>
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/mm.h>
  17 #include <linux/cryptohash.h>
  18 #include <linux/types.h>
  19 #include <crypto/sha.h>
  20
  21 #include <asm/pstate.h>
  22 #include <asm/elf.h>
  23
  24 #include "opcodes.h"
  25
  26 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
  27                                        unsigned int rounds);
  28
  29 static int sha1_sparc64_init(struct shash_desc *desc)
  30 {
  31         struct sha1_state *sctx = shash_desc_ctx(desc);
  32
  33         *sctx = (struct sha1_state){
  34                 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
  35         };
  36
  37         return 0;
  38 }
  39
  40 static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
  41                                   unsigned int len, unsigned int partial)
  42 {
  43         unsigned int done = 0;
  44
  45         sctx->count += len;
  46         if (partial) {
  47                 done = SHA1_BLOCK_SIZE - partial;
  48                 memcpy(sctx->buffer + partial, data, done);
  49                 sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
  50         }
  51         if (len - done >= SHA1_BLOCK_SIZE) {
  52                 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
  53
  54                 sha1_sparc64_transform(sctx->state, data + done, rounds);
  55                 done += rounds * SHA1_BLOCK_SIZE;
  56         }
  57
  58         memcpy(sctx->buffer, data + done, len - done);
  59 }
  60
  61 static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
  62                                unsigned int len)
  63 {
  64         struct sha1_state *sctx = shash_desc_ctx(desc);
  65         unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
  66
  67         /* Handle the fast case right here */
  68         if (partial + len < SHA1_BLOCK_SIZE) {
  69                 sctx->count += len;
  70                 memcpy(sctx->buffer + partial, data, len);
  71         } else
  72                 __sha1_sparc64_update(sctx, data, len, partial);
  73
  74         return 0;
  75 }
  76
  77 /* Add padding and return the message digest. */
  78 static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
  79 {
  80         struct sha1_state *sctx = shash_desc_ctx(desc);
  81         unsigned int i, index, padlen;
  82         __be32 *dst = (__be32 *)out;
  83         __be64 bits;
  84         static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
  85
  86         bits = cpu_to_be64(sctx->count << 3);
  87
  88         /* Pad out to 56 mod 64 and append length */
  89         index = sctx->count % SHA1_BLOCK_SIZE;
  90         padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
  91
  92         /* We need to fill a whole block for __sha1_sparc64_update() */
  93         if (padlen <= 56) {
  94                 sctx->count += padlen;
  95                 memcpy(sctx->buffer + index, padding, padlen);
  96         } else {
  97                 __sha1_sparc64_update(sctx, padding, padlen, index);
  98         }
  99         __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
 100
 101         /* Store state in digest */
 102         for (i = 0; i < 5; i++)
 103                 dst[i] = cpu_to_be32(sctx->state[i]);
 104
 105         /* Wipe context */
 106         memset(sctx, 0, sizeof(*sctx));
 107
 108         return 0;
 109 }
 110
 111 static int sha1_sparc64_export(struct shash_desc *desc, void *out)
 112 {
 113         struct sha1_state *sctx = shash_desc_ctx(desc);
 114
 115         memcpy(out, sctx, sizeof(*sctx));
 116
 117         return 0;
 118 }
 119
 120 static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
 121 {
 122         struct sha1_state *sctx = shash_desc_ctx(desc);
 123
 124         memcpy(sctx, in, sizeof(*sctx));
 125
 126         return 0;
 127 }
 128
 129 static struct shash_alg alg = {
 130         .digestsize     =       SHA1_DIGEST_SIZE,
 131         .init           =       sha1_sparc64_init,
 132         .update         =       sha1_sparc64_update,
 133         .final          =       sha1_sparc64_final,
 134         .export         =       sha1_sparc64_export,
 135         .import         =       sha1_sparc64_import,
 136         .descsize       =       sizeof(struct sha1_state),
 137         .statesize      =       sizeof(struct sha1_state),
 138         .base           =       {
 139                 .cra_name       =       "sha1",
 140                 .cra_driver_name=       "sha1-sparc64",
 141                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 142                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 143                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 144                 .cra_module     =       THIS_MODULE,
 145         }
 146 };
 147
 148 static bool __init sparc64_has_sha1_opcode(void)
 149 {
 150         unsigned long cfr;
 151
 152         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 153                 return false;
 154
 155         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 156         if (!(cfr & CFR_SHA1))
 157                 return false;
 158
 159         return true;
 160 }
 161
 162 static int __init sha1_sparc64_mod_init(void)
 163 {
 164         if (sparc64_has_sha1_opcode()) {
 165                 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
 166                 return crypto_register_shash(&alg);
 167         }
 168         pr_info("sparc64 sha1 opcode not available.\n");
 169         return -ENODEV;
 170 }
 171
 172 static void __exit sha1_sparc64_mod_fini(void)
 173 {
 174         crypto_unregister_shash(&alg);
 175 }
 176
 177 module_init(sha1_sparc64_mod_init);
 178 module_exit(sha1_sparc64_mod_fini);
 179
 180 MODULE_LICENSE("GPL");
 181 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
 182
 183 MODULE_ALIAS("sha1");