arm64/crypto/sha1-ce-glue.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
0004  *
0005  * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
0006  */
0007
0008 #include <asm/neon.h>
0009 #include <asm/simd.h>
0010 #include <asm/unaligned.h>
0011 #include <crypto/internal/hash.h>
0012 #include <crypto/internal/simd.h>
0013 #include <crypto/sha1.h>
0014 #include <crypto/sha1_base.h>
0015 #include <linux/cpufeature.h>
0016 #include <linux/crypto.h>
0017 #include <linux/module.h>
0018
0019 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
0020 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
0021 MODULE_LICENSE("GPL v2");
0022 MODULE_ALIAS_CRYPTO("sha1");
0023
0024 struct sha1_ce_state {
0025     struct sha1_state   sst;
0026     u32         finalize;
0027 };
0028
0029 extern const u32 sha1_ce_offsetof_count;
0030 extern const u32 sha1_ce_offsetof_finalize;
0031
0032 asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
0033                  int blocks);
0034
0035 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
0036                 int blocks)
0037 {
0038     while (blocks) {
0039         int rem;
0040
0041         kernel_neon_begin();
0042         rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state,
0043                              sst), src, blocks);
0044         kernel_neon_end();
0045         src += (blocks - rem) * SHA1_BLOCK_SIZE;
0046         blocks = rem;
0047     }
0048 }
0049
0050 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
0051 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
0052
0053 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
0054               unsigned int len)
0055 {
0056     struct sha1_ce_state *sctx = shash_desc_ctx(desc);
0057
0058     if (!crypto_simd_usable())
0059         return crypto_sha1_update(desc, data, len);
0060
0061     sctx->finalize = 0;
0062     sha1_base_do_update(desc, data, len, __sha1_ce_transform);
0063
0064     return 0;
0065 }
0066
0067 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
0068              unsigned int len, u8 *out)
0069 {
0070     struct sha1_ce_state *sctx = shash_desc_ctx(desc);
0071     bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
0072
0073     if (!crypto_simd_usable())
0074         return crypto_sha1_finup(desc, data, len, out);
0075
0076     /*
0077      * Allow the asm code to perform the finalization if there is no
0078      * partial data and the input is a round multiple of the block size.
0079      */
0080     sctx->finalize = finalize;
0081
0082     sha1_base_do_update(desc, data, len, __sha1_ce_transform);
0083     if (!finalize)
0084         sha1_base_do_finalize(desc, __sha1_ce_transform);
0085     return sha1_base_finish(desc, out);
0086 }
0087
0088 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
0089 {
0090     struct sha1_ce_state *sctx = shash_desc_ctx(desc);
0091
0092     if (!crypto_simd_usable())
0093         return crypto_sha1_finup(desc, NULL, 0, out);
0094
0095     sctx->finalize = 0;
0096     sha1_base_do_finalize(desc, __sha1_ce_transform);
0097     return sha1_base_finish(desc, out);
0098 }
0099
0100 static int sha1_ce_export(struct shash_desc *desc, void *out)
0101 {
0102     struct sha1_ce_state *sctx = shash_desc_ctx(desc);
0103
0104     memcpy(out, &sctx->sst, sizeof(struct sha1_state));
0105     return 0;
0106 }
0107
0108 static int sha1_ce_import(struct shash_desc *desc, const void *in)
0109 {
0110     struct sha1_ce_state *sctx = shash_desc_ctx(desc);
0111
0112     memcpy(&sctx->sst, in, sizeof(struct sha1_state));
0113     sctx->finalize = 0;
0114     return 0;
0115 }
0116
0117 static struct shash_alg alg = {
0118     .init           = sha1_base_init,
0119     .update         = sha1_ce_update,
0120     .final          = sha1_ce_final,
0121     .finup          = sha1_ce_finup,
0122     .import         = sha1_ce_import,
0123     .export         = sha1_ce_export,
0124     .descsize       = sizeof(struct sha1_ce_state),
0125     .statesize      = sizeof(struct sha1_state),
0126     .digestsize     = SHA1_DIGEST_SIZE,
0127     .base           = {
0128         .cra_name       = "sha1",
0129         .cra_driver_name    = "sha1-ce",
0130         .cra_priority       = 200,
0131         .cra_blocksize      = SHA1_BLOCK_SIZE,
0132         .cra_module     = THIS_MODULE,
0133     }
0134 };
0135
0136 static int __init sha1_ce_mod_init(void)
0137 {
0138     return crypto_register_shash(&alg);
0139 }
0140
0141 static void __exit sha1_ce_mod_fini(void)
0142 {
0143     crypto_unregister_shash(&alg);
0144 }
0145
0146 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
0147 module_exit(sha1_ce_mod_fini);