arch/sparc/crypto/sha512_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
   3  *
   4  * This is based largely upon crypto/sha512_generic.c
   5  *
   6  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   7  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   8  * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
   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/types.h>
  18 #include <crypto/sha2.h>
  19 #include <crypto/sha512_base.h>
  20
  21 #include <asm/pstate.h>
  22 #include <asm/elf.h>
  23
  24 #include "opcodes.h"
  25
  26 asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
  27                                          unsigned int rounds);
  28
  29 static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
  30                                     unsigned int len, unsigned int partial)
  31 {
  32         unsigned int done = 0;
  33
  34         if ((sctx->count[0] += len) < len)
  35                 sctx->count[1]++;
  36         if (partial) {
  37                 done = SHA512_BLOCK_SIZE - partial;
  38                 memcpy(sctx->buf + partial, data, done);
  39                 sha512_sparc64_transform(sctx->state, sctx->buf, 1);
  40         }
  41         if (len - done >= SHA512_BLOCK_SIZE) {
  42                 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
  43
  44                 sha512_sparc64_transform(sctx->state, data + done, rounds);
  45                 done += rounds * SHA512_BLOCK_SIZE;
  46         }
  47
  48         memcpy(sctx->buf, data + done, len - done);
  49 }
  50
  51 static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
  52                                  unsigned int len)
  53 {
  54         struct sha512_state *sctx = shash_desc_ctx(desc);
  55         unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
  56
  57         /* Handle the fast case right here */
  58         if (partial + len < SHA512_BLOCK_SIZE) {
  59                 if ((sctx->count[0] += len) < len)
  60                         sctx->count[1]++;
  61                 memcpy(sctx->buf + partial, data, len);
  62         } else
  63                 __sha512_sparc64_update(sctx, data, len, partial);
  64
  65         return 0;
  66 }
  67
  68 static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
  69 {
  70         struct sha512_state *sctx = shash_desc_ctx(desc);
  71         unsigned int i, index, padlen;
  72         __be64 *dst = (__be64 *)out;
  73         __be64 bits[2];
  74         static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
  75
  76         /* Save number of bits */
  77         bits[1] = cpu_to_be64(sctx->count[0] << 3);
  78         bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
  79
  80         /* Pad out to 112 mod 128 and append length */
  81         index = sctx->count[0] % SHA512_BLOCK_SIZE;
  82         padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);
  83
  84         /* We need to fill a whole block for __sha512_sparc64_update() */
  85         if (padlen <= 112) {
  86                 if ((sctx->count[0] += padlen) < padlen)
  87                         sctx->count[1]++;
  88                 memcpy(sctx->buf + index, padding, padlen);
  89         } else {
  90                 __sha512_sparc64_update(sctx, padding, padlen, index);
  91         }
  92         __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);
  93
  94         /* Store state in digest */
  95         for (i = 0; i < 8; i++)
  96                 dst[i] = cpu_to_be64(sctx->state[i]);
  97
  98         /* Wipe context */
  99         memset(sctx, 0, sizeof(*sctx));
 100
 101         return 0;
 102 }
 103
 104 static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
 105 {
 106         u8 D[64];
 107
 108         sha512_sparc64_final(desc, D);
 109
 110         memcpy(hash, D, 48);
 111         memzero_explicit(D, 64);
 112
 113         return 0;
 114 }
 115
 116 static struct shash_alg sha512 = {
 117         .digestsize     =       SHA512_DIGEST_SIZE,
 118         .init           =       sha512_base_init,
 119         .update         =       sha512_sparc64_update,
 120         .final          =       sha512_sparc64_final,
 121         .descsize       =       sizeof(struct sha512_state),
 122         .base           =       {
 123                 .cra_name       =       "sha512",
 124                 .cra_driver_name=       "sha512-sparc64",
 125                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 126                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
 127                 .cra_module     =       THIS_MODULE,
 128         }
 129 };
 130
 131 static struct shash_alg sha384 = {
 132         .digestsize     =       SHA384_DIGEST_SIZE,
 133         .init           =       sha384_base_init,
 134         .update         =       sha512_sparc64_update,
 135         .final          =       sha384_sparc64_final,
 136         .descsize       =       sizeof(struct sha512_state),
 137         .base           =       {
 138                 .cra_name       =       "sha384",
 139                 .cra_driver_name=       "sha384-sparc64",
 140                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 141                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
 142                 .cra_module     =       THIS_MODULE,
 143         }
 144 };
 145
 146 static bool __init sparc64_has_sha512_opcode(void)
 147 {
 148         unsigned long cfr;
 149
 150         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 151                 return false;
 152
 153         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 154         if (!(cfr & CFR_SHA512))
 155                 return false;
 156
 157         return true;
 158 }
 159
 160 static int __init sha512_sparc64_mod_init(void)
 161 {
 162         if (sparc64_has_sha512_opcode()) {
 163                 int ret = crypto_register_shash(&sha384);
 164                 if (ret < 0)
 165                         return ret;
 166
 167                 ret = crypto_register_shash(&sha512);
 168                 if (ret < 0) {
 169                         crypto_unregister_shash(&sha384);
 170                         return ret;
 171                 }
 172
 173                 pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
 174                 return 0;
 175         }
 176         pr_info("sparc64 sha512 opcode not available.\n");
 177         return -ENODEV;
 178 }
 179
 180 static void __exit sha512_sparc64_mod_fini(void)
 181 {
 182         crypto_unregister_shash(&sha384);
 183         crypto_unregister_shash(&sha512);
 184 }
 185
 186 module_init(sha512_sparc64_mod_init);
 187 module_exit(sha512_sparc64_mod_fini);
 188
 189 MODULE_LICENSE("GPL");
 190 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
 191
 192 MODULE_ALIAS_CRYPTO("sha384");
 193 MODULE_ALIAS_CRYPTO("sha512");
 194
 195 #include "crop_devid.c"