arch/sparc/crypto/sha256_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
   3  *
   4  * This is based largely upon crypto/sha256_generic.c
   5  *
   6  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   7  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   8  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   9  * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
  10  */
  11
  12 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  13
  14 #include <crypto/internal/hash.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/mm.h>
  18 #include <linux/types.h>
  19 #include <crypto/sha2.h>
  20 #include <crypto/sha256_base.h>
  21
  22 #include <asm/pstate.h>
  23 #include <asm/elf.h>
  24
  25 #include "opcodes.h"
  26
  27 asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
  28                                          unsigned int rounds);
  29
  30 static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
  31                                     unsigned int len, unsigned int partial)
  32 {
  33         unsigned int done = 0;
  34
  35         sctx->count += len;
  36         if (partial) {
  37                 done = SHA256_BLOCK_SIZE - partial;
  38                 memcpy(sctx->buf + partial, data, done);
  39                 sha256_sparc64_transform(sctx->state, sctx->buf, 1);
  40         }
  41         if (len - done >= SHA256_BLOCK_SIZE) {
  42                 const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
  43
  44                 sha256_sparc64_transform(sctx->state, data + done, rounds);
  45                 done += rounds * SHA256_BLOCK_SIZE;
  46         }
  47
  48         memcpy(sctx->buf, data + done, len - done);
  49 }
  50
  51 static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
  52                                  unsigned int len)
  53 {
  54         struct sha256_state *sctx = shash_desc_ctx(desc);
  55         unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
  56
  57         /* Handle the fast case right here */
  58         if (partial + len < SHA256_BLOCK_SIZE) {
  59                 sctx->count += len;
  60                 memcpy(sctx->buf + partial, data, len);
  61         } else
  62                 __sha256_sparc64_update(sctx, data, len, partial);
  63
  64         return 0;
  65 }
  66
  67 static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
  68 {
  69         struct sha256_state *sctx = shash_desc_ctx(desc);
  70         unsigned int i, index, padlen;
  71         __be32 *dst = (__be32 *)out;
  72         __be64 bits;
  73         static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
  74
  75         bits = cpu_to_be64(sctx->count << 3);
  76
  77         /* Pad out to 56 mod 64 and append length */
  78         index = sctx->count % SHA256_BLOCK_SIZE;
  79         padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);
  80
  81         /* We need to fill a whole block for __sha256_sparc64_update() */
  82         if (padlen <= 56) {
  83                 sctx->count += padlen;
  84                 memcpy(sctx->buf + index, padding, padlen);
  85         } else {
  86                 __sha256_sparc64_update(sctx, padding, padlen, index);
  87         }
  88         __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
  89
  90         /* Store state in digest */
  91         for (i = 0; i < 8; i++)
  92                 dst[i] = cpu_to_be32(sctx->state[i]);
  93
  94         /* Wipe context */
  95         memset(sctx, 0, sizeof(*sctx));
  96
  97         return 0;
  98 }
  99
 100 static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
 101 {
 102         u8 D[SHA256_DIGEST_SIZE];
 103
 104         sha256_sparc64_final(desc, D);
 105
 106         memcpy(hash, D, SHA224_DIGEST_SIZE);
 107         memzero_explicit(D, SHA256_DIGEST_SIZE);
 108
 109         return 0;
 110 }
 111
 112 static int sha256_sparc64_export(struct shash_desc *desc, void *out)
 113 {
 114         struct sha256_state *sctx = shash_desc_ctx(desc);
 115
 116         memcpy(out, sctx, sizeof(*sctx));
 117         return 0;
 118 }
 119
 120 static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
 121 {
 122         struct sha256_state *sctx = shash_desc_ctx(desc);
 123
 124         memcpy(sctx, in, sizeof(*sctx));
 125         return 0;
 126 }
 127
 128 static struct shash_alg sha256_alg = {
 129         .digestsize     =       SHA256_DIGEST_SIZE,
 130         .init           =       sha256_base_init,
 131         .update         =       sha256_sparc64_update,
 132         .final          =       sha256_sparc64_final,
 133         .export         =       sha256_sparc64_export,
 134         .import         =       sha256_sparc64_import,
 135         .descsize       =       sizeof(struct sha256_state),
 136         .statesize      =       sizeof(struct sha256_state),
 137         .base           =       {
 138                 .cra_name       =       "sha256",
 139                 .cra_driver_name=       "sha256-sparc64",
 140                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 141                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 142                 .cra_module     =       THIS_MODULE,
 143         }
 144 };
 145
 146 static struct shash_alg sha224_alg = {
 147         .digestsize     =       SHA224_DIGEST_SIZE,
 148         .init           =       sha224_base_init,
 149         .update         =       sha256_sparc64_update,
 150         .final          =       sha224_sparc64_final,
 151         .descsize       =       sizeof(struct sha256_state),
 152         .base           =       {
 153                 .cra_name       =       "sha224",
 154                 .cra_driver_name=       "sha224-sparc64",
 155                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 156                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 157                 .cra_module     =       THIS_MODULE,
 158         }
 159 };
 160
 161 static bool __init sparc64_has_sha256_opcode(void)
 162 {
 163         unsigned long cfr;
 164
 165         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 166                 return false;
 167
 168         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 169         if (!(cfr & CFR_SHA256))
 170                 return false;
 171
 172         return true;
 173 }
 174
 175 static int __init sha256_sparc64_mod_init(void)
 176 {
 177         if (sparc64_has_sha256_opcode()) {
 178                 int ret = crypto_register_shash(&sha224_alg);
 179                 if (ret < 0)
 180                         return ret;
 181
 182                 ret = crypto_register_shash(&sha256_alg);
 183                 if (ret < 0) {
 184                         crypto_unregister_shash(&sha224_alg);
 185                         return ret;
 186                 }
 187
 188                 pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
 189                 return 0;
 190         }
 191         pr_info("sparc64 sha256 opcode not available.\n");
 192         return -ENODEV;
 193 }
 194
 195 static void __exit sha256_sparc64_mod_fini(void)
 196 {
 197         crypto_unregister_shash(&sha224_alg);
 198         crypto_unregister_shash(&sha256_alg);
 199 }
 200
 201 module_init(sha256_sparc64_mod_init);
 202 module_exit(sha256_sparc64_mod_fini);
 203
 204 MODULE_LICENSE("GPL");
 205 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
 206
 207 MODULE_ALIAS_CRYPTO("sha224");
 208 MODULE_ALIAS_CRYPTO("sha256");
 209
 210 #include "crop_devid.c"