![Ard Biesheuvel](/assets/img/avatar_default.png)
The arm64 kernel will shortly disallow nested kernel mode NEON, so add a fallback to scalar code that can be invoked in that case. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
187 lines
5.2 KiB
C
187 lines
5.2 KiB
C
/*
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* Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64
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*
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* Copyright (c) 2016 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 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 <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/simd.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/cryptohash.h>
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#include <linux/types.h>
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#include <linux/string.h>
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MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64");
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MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("sha224");
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MODULE_ALIAS_CRYPTO("sha256");
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asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
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unsigned int num_blks);
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EXPORT_SYMBOL(sha256_block_data_order);
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asmlinkage void sha256_block_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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return sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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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 (len)
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_data_order);
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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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static struct shash_alg 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.cra_name = "sha256",
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.base.cra_driver_name = "sha256-arm64",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.base.cra_blocksize = SHA256_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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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.cra_name = "sha224",
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.base.cra_driver_name = "sha224-arm64",
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.base.cra_priority = 100,
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.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.base.cra_blocksize = SHA224_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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} };
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static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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/*
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* Stacking and unstacking a substantial slice of the NEON register
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* file may significantly affect performance for small updates when
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* executing in interrupt context, so fall back to the scalar code
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* in that case.
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*/
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if (!may_use_simd())
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return sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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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_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_neon(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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if (len)
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sha256_base_do_update(desc, data, len,
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(sha256_block_fn *)sha256_block_data_order);
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_data_order);
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} else {
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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_neon);
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sha256_base_do_finalize(desc,
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(sha256_block_fn *)sha256_block_neon);
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kernel_neon_end();
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}
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return sha256_base_finish(desc, out);
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}
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static int sha256_final_neon(struct shash_desc *desc, u8 *out)
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{
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return sha256_finup_neon(desc, NULL, 0, out);
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}
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static struct shash_alg 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_neon,
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.final = sha256_final_neon,
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.finup = sha256_finup_neon,
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.descsize = sizeof(struct sha256_state),
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.base.cra_name = "sha256",
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.base.cra_driver_name = "sha256-arm64-neon",
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.base.cra_priority = 150,
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.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.base.cra_blocksize = SHA256_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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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_neon,
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.final = sha256_final_neon,
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.finup = sha256_finup_neon,
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.descsize = sizeof(struct sha256_state),
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.base.cra_name = "sha224",
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.base.cra_driver_name = "sha224-arm64-neon",
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.base.cra_priority = 150,
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.base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.base.cra_blocksize = SHA224_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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} };
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static int __init sha256_mod_init(void)
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{
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int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
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if (ret)
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return ret;
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if (elf_hwcap & HWCAP_ASIMD) {
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ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
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if (ret)
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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return ret;
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}
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static void __exit sha256_mod_fini(void)
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{
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if (elf_hwcap & HWCAP_ASIMD)
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crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_init(sha256_mod_init);
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module_exit(sha256_mod_fini);
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