arm64/crypto/sha2-ce-glue.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * sha2-ce-glue.c - SHA-224/SHA-256 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/sha2.h>
0014 #include <crypto/sha256_base.h>
0015 #include <linux/cpufeature.h>
0016 #include <linux/crypto.h>
0017 #include <linux/module.h>
0018
0019 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
0020 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
0021 MODULE_LICENSE("GPL v2");
0022 MODULE_ALIAS_CRYPTO("sha224");
0023 MODULE_ALIAS_CRYPTO("sha256");
0024
0025 struct sha256_ce_state {
0026     struct sha256_state sst;
0027     u32         finalize;
0028 };
0029
0030 extern const u32 sha256_ce_offsetof_count;
0031 extern const u32 sha256_ce_offsetof_finalize;
0032
0033 asmlinkage int sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
0034                  int blocks);
0035
0036 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
0037                 int blocks)
0038 {
0039     while (blocks) {
0040         int rem;
0041
0042         kernel_neon_begin();
0043         rem = sha2_ce_transform(container_of(sst, struct sha256_ce_state,
0044                              sst), src, blocks);
0045         kernel_neon_end();
0046         src += (blocks - rem) * SHA256_BLOCK_SIZE;
0047         blocks = rem;
0048     }
0049 }
0050
0051 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
0052                           sst.count);
0053 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
0054                          finalize);
0055
0056 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
0057
0058 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
0059                       int blocks)
0060 {
0061     sha256_block_data_order(sst->state, src, blocks);
0062 }
0063
0064 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
0065                 unsigned int len)
0066 {
0067     struct sha256_ce_state *sctx = shash_desc_ctx(desc);
0068
0069     if (!crypto_simd_usable())
0070         return sha256_base_do_update(desc, data, len,
0071                 __sha256_block_data_order);
0072
0073     sctx->finalize = 0;
0074     sha256_base_do_update(desc, data, len, __sha2_ce_transform);
0075
0076     return 0;
0077 }
0078
0079 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
0080                unsigned int len, u8 *out)
0081 {
0082     struct sha256_ce_state *sctx = shash_desc_ctx(desc);
0083     bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
0084
0085     if (!crypto_simd_usable()) {
0086         if (len)
0087             sha256_base_do_update(desc, data, len,
0088                 __sha256_block_data_order);
0089         sha256_base_do_finalize(desc, __sha256_block_data_order);
0090         return sha256_base_finish(desc, out);
0091     }
0092
0093     /*
0094      * Allow the asm code to perform the finalization if there is no
0095      * partial data and the input is a round multiple of the block size.
0096      */
0097     sctx->finalize = finalize;
0098
0099     sha256_base_do_update(desc, data, len, __sha2_ce_transform);
0100     if (!finalize)
0101         sha256_base_do_finalize(desc, __sha2_ce_transform);
0102     return sha256_base_finish(desc, out);
0103 }
0104
0105 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
0106 {
0107     struct sha256_ce_state *sctx = shash_desc_ctx(desc);
0108
0109     if (!crypto_simd_usable()) {
0110         sha256_base_do_finalize(desc, __sha256_block_data_order);
0111         return sha256_base_finish(desc, out);
0112     }
0113
0114     sctx->finalize = 0;
0115     sha256_base_do_finalize(desc, __sha2_ce_transform);
0116     return sha256_base_finish(desc, out);
0117 }
0118
0119 static int sha256_ce_export(struct shash_desc *desc, void *out)
0120 {
0121     struct sha256_ce_state *sctx = shash_desc_ctx(desc);
0122
0123     memcpy(out, &sctx->sst, sizeof(struct sha256_state));
0124     return 0;
0125 }
0126
0127 static int sha256_ce_import(struct shash_desc *desc, const void *in)
0128 {
0129     struct sha256_ce_state *sctx = shash_desc_ctx(desc);
0130
0131     memcpy(&sctx->sst, in, sizeof(struct sha256_state));
0132     sctx->finalize = 0;
0133     return 0;
0134 }
0135
0136 static struct shash_alg algs[] = { {
0137     .init           = sha224_base_init,
0138     .update         = sha256_ce_update,
0139     .final          = sha256_ce_final,
0140     .finup          = sha256_ce_finup,
0141     .export         = sha256_ce_export,
0142     .import         = sha256_ce_import,
0143     .descsize       = sizeof(struct sha256_ce_state),
0144     .statesize      = sizeof(struct sha256_state),
0145     .digestsize     = SHA224_DIGEST_SIZE,
0146     .base           = {
0147         .cra_name       = "sha224",
0148         .cra_driver_name    = "sha224-ce",
0149         .cra_priority       = 200,
0150         .cra_blocksize      = SHA256_BLOCK_SIZE,
0151         .cra_module     = THIS_MODULE,
0152     }
0153 }, {
0154     .init           = sha256_base_init,
0155     .update         = sha256_ce_update,
0156     .final          = sha256_ce_final,
0157     .finup          = sha256_ce_finup,
0158     .export         = sha256_ce_export,
0159     .import         = sha256_ce_import,
0160     .descsize       = sizeof(struct sha256_ce_state),
0161     .statesize      = sizeof(struct sha256_state),
0162     .digestsize     = SHA256_DIGEST_SIZE,
0163     .base           = {
0164         .cra_name       = "sha256",
0165         .cra_driver_name    = "sha256-ce",
0166         .cra_priority       = 200,
0167         .cra_blocksize      = SHA256_BLOCK_SIZE,
0168         .cra_module     = THIS_MODULE,
0169     }
0170 } };
0171
0172 static int __init sha2_ce_mod_init(void)
0173 {
0174     return crypto_register_shashes(algs, ARRAY_SIZE(algs));
0175 }
0176
0177 static void __exit sha2_ce_mod_fini(void)
0178 {
0179     crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
0180 }
0181
0182 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
0183 module_exit(sha2_ce_mod_fini);