arch/sparc/crypto/sha512_glue.c

   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
  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
  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
  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
  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
  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
 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
 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
 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
 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"