arch/sparc/crypto/sha1_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
   3  *
   4  * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
   5  *
   6  * Copyright (c) Alan Smithee.
   7  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   8  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
   9  * Copyright (c) Mathias Krause <minipli@googlemail.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/sha1.h>
  20 #include <crypto/sha1_base.h>
  21
  22 #include <asm/pstate.h>
  23 #include <asm/elf.h>
  24
  25 #include "opcodes.h"
  26
  27 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
  28                                        unsigned int rounds);
  29
  30 static void __sha1_sparc64_update(struct sha1_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 = SHA1_BLOCK_SIZE - partial;
  38                 memcpy(sctx->buffer + partial, data, done);
  39                 sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
  40         }
  41         if (len - done >= SHA1_BLOCK_SIZE) {
  42                 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
  43
  44                 sha1_sparc64_transform(sctx->state, data + done, rounds);
  45                 done += rounds * SHA1_BLOCK_SIZE;
  46         }
  47
  48         memcpy(sctx->buffer, data + done, len - done);
  49 }
  50
  51 static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
  52                                unsigned int len)
  53 {
  54         struct sha1_state *sctx = shash_desc_ctx(desc);
  55         unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
  56
  57         /* Handle the fast case right here */
  58         if (partial + len < SHA1_BLOCK_SIZE) {
  59                 sctx->count += len;
  60                 memcpy(sctx->buffer + partial, data, len);
  61         } else
  62                 __sha1_sparc64_update(sctx, data, len, partial);
  63
  64         return 0;
  65 }
  66
  67 /* Add padding and return the message digest. */
  68 static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
  69 {
  70         struct sha1_state *sctx = shash_desc_ctx(desc);
  71         unsigned int i, index, padlen;
  72         __be32 *dst = (__be32 *)out;
  73         __be64 bits;
  74         static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
  75
  76         bits = cpu_to_be64(sctx->count << 3);
  77
  78         /* Pad out to 56 mod 64 and append length */
  79         index = sctx->count % SHA1_BLOCK_SIZE;
  80         padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
  81
  82         /* We need to fill a whole block for __sha1_sparc64_update() */
  83         if (padlen <= 56) {
  84                 sctx->count += padlen;
  85                 memcpy(sctx->buffer + index, padding, padlen);
  86         } else {
  87                 __sha1_sparc64_update(sctx, padding, padlen, index);
  88         }
  89         __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
  90
  91         /* Store state in digest */
  92         for (i = 0; i < 5; i++)
  93                 dst[i] = cpu_to_be32(sctx->state[i]);
  94
  95         /* Wipe context */
  96         memset(sctx, 0, sizeof(*sctx));
  97
  98         return 0;
  99 }
 100
 101 static int sha1_sparc64_export(struct shash_desc *desc, void *out)
 102 {
 103         struct sha1_state *sctx = shash_desc_ctx(desc);
 104
 105         memcpy(out, sctx, sizeof(*sctx));
 106
 107         return 0;
 108 }
 109
 110 static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
 111 {
 112         struct sha1_state *sctx = shash_desc_ctx(desc);
 113
 114         memcpy(sctx, in, sizeof(*sctx));
 115
 116         return 0;
 117 }
 118
 119 static struct shash_alg alg = {
 120         .digestsize     =       SHA1_DIGEST_SIZE,
 121         .init           =       sha1_base_init,
 122         .update         =       sha1_sparc64_update,
 123         .final          =       sha1_sparc64_final,
 124         .export         =       sha1_sparc64_export,
 125         .import         =       sha1_sparc64_import,
 126         .descsize       =       sizeof(struct sha1_state),
 127         .statesize      =       sizeof(struct sha1_state),
 128         .base           =       {
 129                 .cra_name       =       "sha1",
 130                 .cra_driver_name=       "sha1-sparc64",
 131                 .cra_priority   =       SPARC_CR_OPCODE_PRIORITY,
 132                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 133                 .cra_module     =       THIS_MODULE,
 134         }
 135 };
 136
 137 static bool __init sparc64_has_sha1_opcode(void)
 138 {
 139         unsigned long cfr;
 140
 141         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 142                 return false;
 143
 144         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 145         if (!(cfr & CFR_SHA1))
 146                 return false;
 147
 148         return true;
 149 }
 150
 151 static int __init sha1_sparc64_mod_init(void)
 152 {
 153         if (sparc64_has_sha1_opcode()) {
 154                 pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
 155                 return crypto_register_shash(&alg);
 156         }
 157         pr_info("sparc64 sha1 opcode not available.\n");
 158         return -ENODEV;
 159 }
 160
 161 static void __exit sha1_sparc64_mod_fini(void)
 162 {
 163         crypto_unregister_shash(&alg);
 164 }
 165
 166 module_init(sha1_sparc64_mod_init);
 167 module_exit(sha1_sparc64_mod_fini);
 168
 169 MODULE_LICENSE("GPL");
 170 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
 171
 172 MODULE_ALIAS_CRYPTO("sha1");
 173
 174 #include "crop_devid.c"