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