| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions |
| 3 | * |
| 4 | * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <crypto/internal/hash.h> |
| 12 | #include <crypto/sha.h> |
| 13 | #include <crypto/sha256_base.h> |
| 14 | #include <linux/cpufeature.h> |
| 15 | #include <linux/crypto.h> |
| 16 | #include <linux/module.h> |
| 17 | |
| 18 | #include <asm/hwcap.h> |
| 19 | #include <asm/simd.h> |
| 20 | #include <asm/neon.h> |
| 21 | #include <asm/unaligned.h> |
| 22 | |
| 23 | #include "sha256_glue.h" |
| 24 | |
| 25 | MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); |
| 26 | MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); |
| 27 | MODULE_LICENSE("GPL v2"); |
| 28 | |
| 29 | asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src, |
| 30 | int blocks); |
| 31 | |
| 32 | static int sha2_ce_update(struct shash_desc *desc, const u8 *data, |
| 33 | unsigned int len) |
| 34 | { |
| 35 | struct sha256_state *sctx = shash_desc_ctx(desc); |
| 36 | |
| 37 | if (!may_use_simd() || |
| 38 | (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) |
| 39 | return crypto_sha256_arm_update(desc, data, len); |
| 40 | |
| 41 | kernel_neon_begin(); |
| 42 | sha256_base_do_update(desc, data, len, |
| 43 | (sha256_block_fn *)sha2_ce_transform); |
| 44 | kernel_neon_end(); |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static int sha2_ce_finup(struct shash_desc *desc, const u8 *data, |
| 50 | unsigned int len, u8 *out) |
| 51 | { |
| 52 | if (!may_use_simd()) |
| 53 | return crypto_sha256_arm_finup(desc, data, len, out); |
| 54 | |
| 55 | kernel_neon_begin(); |
| 56 | if (len) |
| 57 | sha256_base_do_update(desc, data, len, |
| 58 | (sha256_block_fn *)sha2_ce_transform); |
| 59 | sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); |
| 60 | kernel_neon_end(); |
| 61 | |
| 62 | return sha256_base_finish(desc, out); |
| 63 | } |
| 64 | |
| 65 | static int sha2_ce_final(struct shash_desc *desc, u8 *out) |
| 66 | { |
| 67 | return sha2_ce_finup(desc, NULL, 0, out); |
| 68 | } |
| 69 | |
| 70 | static struct shash_alg algs[] = { { |
| 71 | .init = sha224_base_init, |
| 72 | .update = sha2_ce_update, |
| 73 | .final = sha2_ce_final, |
| 74 | .finup = sha2_ce_finup, |
| 75 | .descsize = sizeof(struct sha256_state), |
| 76 | .digestsize = SHA224_DIGEST_SIZE, |
| 77 | .base = { |
| 78 | .cra_name = "sha224", |
| 79 | .cra_driver_name = "sha224-ce", |
| 80 | .cra_priority = 300, |
| 81 | .cra_blocksize = SHA256_BLOCK_SIZE, |
| 82 | .cra_module = THIS_MODULE, |
| 83 | } |
| 84 | }, { |
| 85 | .init = sha256_base_init, |
| 86 | .update = sha2_ce_update, |
| 87 | .final = sha2_ce_final, |
| 88 | .finup = sha2_ce_finup, |
| 89 | .descsize = sizeof(struct sha256_state), |
| 90 | .digestsize = SHA256_DIGEST_SIZE, |
| 91 | .base = { |
| 92 | .cra_name = "sha256", |
| 93 | .cra_driver_name = "sha256-ce", |
| 94 | .cra_priority = 300, |
| 95 | .cra_blocksize = SHA256_BLOCK_SIZE, |
| 96 | .cra_module = THIS_MODULE, |
| 97 | } |
| 98 | } }; |
| 99 | |
| 100 | static int __init sha2_ce_mod_init(void) |
| 101 | { |
| 102 | return crypto_register_shashes(algs, ARRAY_SIZE(algs)); |
| 103 | } |
| 104 | |
| 105 | static void __exit sha2_ce_mod_fini(void) |
| 106 | { |
| 107 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); |
| 108 | } |
| 109 | |
| 110 | module_cpu_feature_match(SHA2, sha2_ce_mod_init); |
| 111 | module_exit(sha2_ce_mod_fini); |