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 MODULE_ALIAS_CRYPTO("sha3-224");
  26 MODULE_ALIAS_CRYPTO("sha3-256");
  27 MODULE_ALIAS_CRYPTO("sha3-384");
  28 MODULE_ALIAS_CRYPTO("sha3-512");
  29
  30 asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
  31                                   int md_len);
  32
  33 static int sha3_update(struct shash_desc *desc, const u8 *data,
  34                        unsigned int len)
  35 {
  36         struct sha3_state *sctx = shash_desc_ctx(desc);
  37         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
  38
  39         if (!may_use_simd())
  40                 return crypto_sha3_update(desc, data, len);
  41
  42         if ((sctx->partial + len) >= sctx->rsiz) {
  43                 int blocks;
  44
  45                 if (sctx->partial) {
  46                         int p = sctx->rsiz - sctx->partial;
  47
  48                         memcpy(sctx->buf + sctx->partial, data, p);
  49                         kernel_neon_begin();
  50                         sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
  51                         kernel_neon_end();
  52
  53                         data += p;
  54                         len -= p;
  55                         sctx->partial = 0;
  56                 }
  57
  58                 blocks = len / sctx->rsiz;
  59                 len %= sctx->rsiz;
  60
  61                 if (blocks) {
  62                         kernel_neon_begin();
  63                         sha3_ce_transform(sctx->st, data, blocks, digest_size);
  64                         kernel_neon_end();
  65                         data += blocks * sctx->rsiz;
  66                 }
  67         }
  68
  69         if (len) {
  70                 memcpy(sctx->buf + sctx->partial, data, len);
  71                 sctx->partial += len;
  72         }
  73         return 0;
  74 }
  75
  76 static int sha3_final(struct shash_desc *desc, u8 *out)
  77 {
  78         struct sha3_state *sctx = shash_desc_ctx(desc);
  79         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
  80         __le64 *digest = (__le64 *)out;
  81         int i;
  82
  83         if (!may_use_simd())
  84                 return crypto_sha3_final(desc, out);
  85
  86         sctx->buf[sctx->partial++] = 0x06;
  87         memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial);
  88         sctx->buf[sctx->rsiz - 1] |= 0x80;
  89
  90         kernel_neon_begin();
  91         sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
  92         kernel_neon_end();
  93
  94         for (i = 0; i < digest_size / 8; i++)
  95                 put_unaligned_le64(sctx->st[i], digest++);
  96
  97         if (digest_size & 4)
  98                 put_unaligned_le32(sctx->st[i], (__le32 *)digest);
  99
 100         *sctx = (struct sha3_state){};
 101         return 0;
 102 }
 103
 104 static struct shash_alg algs[] = { {
 105         .digestsize             = SHA3_224_DIGEST_SIZE,
 106         .init                   = crypto_sha3_init,
 107         .update                 = sha3_update,
 108         .final                  = sha3_final,
 109         .descsize               = sizeof(struct sha3_state),
 110         .base.cra_name          = "sha3-224",
 111         .base.cra_driver_name   = "sha3-224-ce",
 112         .base.cra_blocksize     = SHA3_224_BLOCK_SIZE,
 113         .base.cra_module        = THIS_MODULE,
 114         .base.cra_priority      = 200,
 115 }, {
 116         .digestsize             = SHA3_256_DIGEST_SIZE,
 117         .init                   = crypto_sha3_init,
 118         .update                 = sha3_update,
 119         .final                  = sha3_final,
 120         .descsize               = sizeof(struct sha3_state),
 121         .base.cra_name          = "sha3-256",
 122         .base.cra_driver_name   = "sha3-256-ce",
 123         .base.cra_blocksize     = SHA3_256_BLOCK_SIZE,
 124         .base.cra_module        = THIS_MODULE,
 125         .base.cra_priority      = 200,
 126 }, {
 127         .digestsize             = SHA3_384_DIGEST_SIZE,
 128         .init                   = crypto_sha3_init,
 129         .update                 = sha3_update,
 130         .final                  = sha3_final,
 131         .descsize               = sizeof(struct sha3_state),
 132         .base.cra_name          = "sha3-384",
 133         .base.cra_driver_name   = "sha3-384-ce",
 134         .base.cra_blocksize     = SHA3_384_BLOCK_SIZE,
 135         .base.cra_module        = THIS_MODULE,
 136         .base.cra_priority      = 200,
 137 }, {
 138         .digestsize             = SHA3_512_DIGEST_SIZE,
 139         .init                   = crypto_sha3_init,
 140         .update                 = sha3_update,
 141         .final                  = sha3_final,
 142         .descsize               = sizeof(struct sha3_state),
 143         .base.cra_name          = "sha3-512",
 144         .base.cra_driver_name   = "sha3-512-ce",
 145         .base.cra_blocksize     = SHA3_512_BLOCK_SIZE,
 146         .base.cra_module        = THIS_MODULE,
 147         .base.cra_priority      = 200,
 148 } };
 149
 150 static int __init sha3_neon_mod_init(void)
 151 {
 152         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 153 }
 154
 155 static void __exit sha3_neon_mod_fini(void)
 156 {
 157         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 158 }
 159
 160 module_cpu_feature_match(SHA3, sha3_neon_mod_init);
 161 module_exit(sha3_neon_mod_fini);