arch/arm64/crypto/sha3-ce-glue.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * sha3-ce-glue.c - core SHA-3 transform using v8.2 Crypto Extensions
   4  *
   5  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <asm/hwcap.h>
  13 #include <asm/neon.h>
  14 #include <asm/simd.h>
  15 #include <asm/unaligned.h>
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/sha3.h>
  18 #include <linux/cpufeature.h>
  19 #include <linux/crypto.h>
  20 #include <linux/module.h>
  21
  22 MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions");
  23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24 MODULE_LICENSE("GPL v2");
  25
  26 asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
  27                                   int md_len);
  28
  29 static int sha3_update(struct shash_desc *desc, const u8 *data,
  30                        unsigned int len)
  31 {
  32         struct sha3_state *sctx = shash_desc_ctx(desc);
  33         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
  34
  35         if (!may_use_simd())
  36                 return crypto_sha3_update(desc, data, len);
  37
  38         if ((sctx->partial + len) >= sctx->rsiz) {
  39                 int blocks;
  40
  41                 if (sctx->partial) {
  42                         int p = sctx->rsiz - sctx->partial;
  43
  44                         memcpy(sctx->buf + sctx->partial, data, p);
  45                         kernel_neon_begin();
  46                         sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
  47                         kernel_neon_end();
  48
  49                         data += p;
  50                         len -= p;
  51                         sctx->partial = 0;
  52                 }
  53
  54                 blocks = len / sctx->rsiz;
  55                 len %= sctx->rsiz;
  56
  57                 if (blocks) {
  58                         kernel_neon_begin();
  59                         sha3_ce_transform(sctx->st, data, blocks, digest_size);
  60                         kernel_neon_end();
  61                         data += blocks * sctx->rsiz;
  62                 }
  63         }
  64
  65         if (len) {
  66                 memcpy(sctx->buf + sctx->partial, data, len);
  67                 sctx->partial += len;
  68         }
  69         return 0;
  70 }
  71
  72 static int sha3_final(struct shash_desc *desc, u8 *out)
  73 {
  74         struct sha3_state *sctx = shash_desc_ctx(desc);
  75         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
  76         __le64 *digest = (__le64 *)out;
  77         int i;
  78
  79         if (!may_use_simd())
  80                 return crypto_sha3_final(desc, out);
  81
  82         sctx->buf[sctx->partial++] = 0x06;
  83         memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial);
  84         sctx->buf[sctx->rsiz - 1] |= 0x80;
  85
  86         kernel_neon_begin();
  87         sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
  88         kernel_neon_end();
  89
  90         for (i = 0; i < digest_size / 8; i++)
  91                 put_unaligned_le64(sctx->st[i], digest++);
  92
  93         if (digest_size & 4)
  94                 put_unaligned_le32(sctx->st[i], (__le32 *)digest);
  95
  96         *sctx = (struct sha3_state){};
  97         return 0;
  98 }
  99
 100 static struct shash_alg algs[] = { {
 101         .digestsize             = SHA3_224_DIGEST_SIZE,
 102         .init                   = crypto_sha3_init,
 103         .update                 = sha3_update,
 104         .final                  = sha3_final,
 105         .descsize               = sizeof(struct sha3_state),
 106         .base.cra_name          = "sha3-224",
 107         .base.cra_driver_name   = "sha3-224-ce",
 108         .base.cra_blocksize     = SHA3_224_BLOCK_SIZE,
 109         .base.cra_module        = THIS_MODULE,
 110         .base.cra_priority      = 200,
 111 }, {
 112         .digestsize             = SHA3_256_DIGEST_SIZE,
 113         .init                   = crypto_sha3_init,
 114         .update                 = sha3_update,
 115         .final                  = sha3_final,
 116         .descsize               = sizeof(struct sha3_state),
 117         .base.cra_name          = "sha3-256",
 118         .base.cra_driver_name   = "sha3-256-ce",
 119         .base.cra_blocksize     = SHA3_256_BLOCK_SIZE,
 120         .base.cra_module        = THIS_MODULE,
 121         .base.cra_priority      = 200,
 122 }, {
 123         .digestsize             = SHA3_384_DIGEST_SIZE,
 124         .init                   = crypto_sha3_init,
 125         .update                 = sha3_update,
 126         .final                  = sha3_final,
 127         .descsize               = sizeof(struct sha3_state),
 128         .base.cra_name          = "sha3-384",
 129         .base.cra_driver_name   = "sha3-384-ce",
 130         .base.cra_blocksize     = SHA3_384_BLOCK_SIZE,
 131         .base.cra_module        = THIS_MODULE,
 132         .base.cra_priority      = 200,
 133 }, {
 134         .digestsize             = SHA3_512_DIGEST_SIZE,
 135         .init                   = crypto_sha3_init,
 136         .update                 = sha3_update,
 137         .final                  = sha3_final,
 138         .descsize               = sizeof(struct sha3_state),
 139         .base.cra_name          = "sha3-512",
 140         .base.cra_driver_name   = "sha3-512-ce",
 141         .base.cra_blocksize     = SHA3_512_BLOCK_SIZE,
 142         .base.cra_module        = THIS_MODULE,
 143         .base.cra_priority      = 200,
 144 } };
 145
 146 static int __init sha3_neon_mod_init(void)
 147 {
 148         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 149 }
 150
 151 static void __exit sha3_neon_mod_fini(void)
 152 {
 153         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 154 }
 155
 156 module_cpu_feature_match(SHA3, sha3_neon_mod_init);
 157 module_exit(sha3_neon_mod_fini);