102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Glue code for the SHA256 Secure Hash Algorithm assembly implementation
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* using NEON instructions.
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*
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* Copyright © 2015 Google Inc.
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*
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* This file is based on sha512_neon_glue.c:
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* Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <crypto/sha.h>
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#include <crypto/sha256_base.h>
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#include <asm/byteorder.h>
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#include <asm/simd.h>
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#include <asm/neon.h>
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#include "sha256_glue.h"
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asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data,
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unsigned int num_blks);
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static int sha256_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_state *sctx = shash_desc_ctx(desc);
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if (!may_use_simd() ||
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(sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
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return crypto_sha256_arm_update(desc, data, len);
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kernel_neon_begin();
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order_neon);
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kernel_neon_end();
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return 0;
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}
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static int sha256_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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if (!may_use_simd())
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return crypto_sha256_arm_finup(desc, data, len, out);
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kernel_neon_begin();
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if (len)
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order_neon);
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_data_order_neon);
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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_final(struct shash_desc *desc, u8 *out)
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{
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return sha256_finup(desc, NULL, 0, out);
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}
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struct shash_alg sha256_neon_algs[] = { {
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.digestsize = SHA256_DIGEST_SIZE,
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.init = sha256_base_init,
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.update = sha256_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.descsize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-neon",
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.cra_priority = 250,
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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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.digestsize = SHA224_DIGEST_SIZE,
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.init = sha224_base_init,
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.update = sha256_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.descsize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-neon",
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.cra_priority = 250,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA224_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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} };
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