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147 lines
3.7 KiB
147 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions |
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* |
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* Copyright (C) 2014 - 2017 Linaro Ltd <[email protected]> |
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*/ |
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#include <asm/neon.h> |
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#include <asm/simd.h> |
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#include <asm/unaligned.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/internal/simd.h> |
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#include <crypto/sha1.h> |
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#include <crypto/sha1_base.h> |
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#include <linux/cpufeature.h> |
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#include <linux/crypto.h> |
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#include <linux/module.h> |
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MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS_CRYPTO("sha1"); |
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struct sha1_ce_state { |
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struct sha1_state sst; |
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u32 finalize; |
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}; |
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extern const u32 sha1_ce_offsetof_count; |
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extern const u32 sha1_ce_offsetof_finalize; |
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asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, |
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int blocks); |
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static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src, |
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int blocks) |
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{ |
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while (blocks) { |
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int rem; |
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kernel_neon_begin(); |
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rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state, |
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sst), src, blocks); |
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kernel_neon_end(); |
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src += (blocks - rem) * SHA1_BLOCK_SIZE; |
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blocks = rem; |
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} |
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} |
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const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); |
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const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); |
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static int sha1_ce_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
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if (!crypto_simd_usable()) |
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return crypto_sha1_update(desc, data, len); |
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sctx->finalize = 0; |
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sha1_base_do_update(desc, data, len, __sha1_ce_transform); |
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return 0; |
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} |
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static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
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bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; |
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if (!crypto_simd_usable()) |
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return crypto_sha1_finup(desc, data, len, out); |
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/* |
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* Allow the asm code to perform the finalization if there is no |
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* partial data and the input is a round multiple of the block size. |
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*/ |
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sctx->finalize = finalize; |
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sha1_base_do_update(desc, data, len, __sha1_ce_transform); |
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if (!finalize) |
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sha1_base_do_finalize(desc, __sha1_ce_transform); |
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return sha1_base_finish(desc, out); |
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} |
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static int sha1_ce_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
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if (!crypto_simd_usable()) |
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return crypto_sha1_finup(desc, NULL, 0, out); |
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sctx->finalize = 0; |
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sha1_base_do_finalize(desc, __sha1_ce_transform); |
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return sha1_base_finish(desc, out); |
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} |
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static int sha1_ce_export(struct shash_desc *desc, void *out) |
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{ |
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struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
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memcpy(out, &sctx->sst, sizeof(struct sha1_state)); |
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return 0; |
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} |
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static int sha1_ce_import(struct shash_desc *desc, const void *in) |
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{ |
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struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
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memcpy(&sctx->sst, in, sizeof(struct sha1_state)); |
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sctx->finalize = 0; |
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return 0; |
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} |
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static struct shash_alg alg = { |
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.init = sha1_base_init, |
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.update = sha1_ce_update, |
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.final = sha1_ce_final, |
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.finup = sha1_ce_finup, |
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.import = sha1_ce_import, |
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.export = sha1_ce_export, |
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.descsize = sizeof(struct sha1_ce_state), |
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.statesize = sizeof(struct sha1_state), |
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.digestsize = SHA1_DIGEST_SIZE, |
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.base = { |
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.cra_name = "sha1", |
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.cra_driver_name = "sha1-ce", |
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.cra_priority = 200, |
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.cra_blocksize = SHA1_BLOCK_SIZE, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static int __init sha1_ce_mod_init(void) |
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{ |
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return crypto_register_shash(&alg); |
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} |
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static void __exit sha1_ce_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_cpu_feature_match(SHA1, sha1_ce_mod_init); |
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module_exit(sha1_ce_mod_fini);
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