128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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* sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <asm/unaligned.h>
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <crypto/sha256_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("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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struct sha256_ce_state {
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struct sha256_state sst;
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u32 finalize;
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};
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asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
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int blocks);
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const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
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sst.count);
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const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
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finalize);
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static int sha256_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 sha256_ce_state *sctx = shash_desc_ctx(desc);
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sctx->finalize = 0;
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kernel_neon_begin_partial(28);
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha2_ce_transform);
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kernel_neon_end();
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return 0;
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}
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static int sha256_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 sha256_ce_state *sctx = shash_desc_ctx(desc);
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bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
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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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kernel_neon_begin_partial(28);
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha2_ce_transform);
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if (!finalize)
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha2_ce_transform);
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kernel_neon_end();
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return sha256_base_finish(desc, out);
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}
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static int sha256_ce_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_ce_state *sctx = shash_desc_ctx(desc);
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sctx->finalize = 0;
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kernel_neon_begin_partial(28);
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sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
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kernel_neon_end();
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return sha256_base_finish(desc, out);
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}
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static struct shash_alg algs[] = { {
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.init = sha224_base_init,
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.update = sha256_ce_update,
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.final = sha256_ce_final,
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.finup = sha256_ce_finup,
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.descsize = sizeof(struct sha256_ce_state),
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.digestsize = SHA224_DIGEST_SIZE,
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.init = sha256_base_init,
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.update = sha256_ce_update,
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.final = sha256_ce_final,
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.finup = sha256_ce_finup,
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.descsize = sizeof(struct sha256_ce_state),
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.digestsize = SHA256_DIGEST_SIZE,
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_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 sha2_ce_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha2_ce_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_cpu_feature_match(SHA2, sha2_ce_mod_init);
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module_exit(sha2_ce_mod_fini);
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