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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/crypto/sha256-glue.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/arch/arm64/crypto/sha256-glue.c b/arch/arm64/crypto/sha256-glue.c new file mode 100644 index 000000000..4aedeaefd --- /dev/null +++ b/arch/arm64/crypto/sha256-glue.c @@ -0,0 +1,192 @@ +/* + * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64 + * + * Copyright (c) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ + +#include <asm/hwcap.h> +#include <asm/neon.h> +#include <asm/simd.h> +#include <crypto/internal/hash.h> +#include <crypto/sha.h> +#include <crypto/sha256_base.h> +#include <linux/cryptohash.h> +#include <linux/types.h> +#include <linux/string.h> + +MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64"); +MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>"); +MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_CRYPTO("sha224"); +MODULE_ALIAS_CRYPTO("sha256"); + +asmlinkage void sha256_block_data_order(u32 *digest, const void *data, + unsigned int num_blks); +EXPORT_SYMBOL(sha256_block_data_order); + +asmlinkage void sha256_block_neon(u32 *digest, const void *data, + unsigned int num_blks); + +static int sha256_update(struct shash_desc *desc, const u8 *data, + unsigned int len) +{ + return sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); +} + +static int sha256_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) +{ + if (len) + sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); + sha256_base_do_finalize(desc, + (sha256_block_fn *)sha256_block_data_order); + + return sha256_base_finish(desc, out); +} + +static int sha256_final(struct shash_desc *desc, u8 *out) +{ + return sha256_finup(desc, NULL, 0, out); +} + +static struct shash_alg algs[] = { { + .digestsize = SHA256_DIGEST_SIZE, + .init = sha256_base_init, + .update = sha256_update, + .final = sha256_final, + .finup = sha256_finup, + .descsize = sizeof(struct sha256_state), + .base.cra_name = "sha256", + .base.cra_driver_name = "sha256-arm64", + .base.cra_priority = 125, + .base.cra_blocksize = SHA256_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +}, { + .digestsize = SHA224_DIGEST_SIZE, + .init = sha224_base_init, + .update = sha256_update, + .final = sha256_final, + .finup = sha256_finup, + .descsize = sizeof(struct sha256_state), + .base.cra_name = "sha224", + .base.cra_driver_name = "sha224-arm64", + .base.cra_priority = 125, + .base.cra_blocksize = SHA224_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +} }; + +static int sha256_update_neon(struct shash_desc *desc, const u8 *data, + unsigned int len) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + + if (!may_use_simd()) + return sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); + + while (len > 0) { + unsigned int chunk = len; + + /* + * Don't hog the CPU for the entire time it takes to process all + * input when running on a preemptible kernel, but process the + * data block by block instead. + */ + if (IS_ENABLED(CONFIG_PREEMPT) && + chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE) + chunk = SHA256_BLOCK_SIZE - + sctx->count % SHA256_BLOCK_SIZE; + + kernel_neon_begin(); + sha256_base_do_update(desc, data, chunk, + (sha256_block_fn *)sha256_block_neon); + kernel_neon_end(); + data += chunk; + len -= chunk; + } + return 0; +} + +static int sha256_finup_neon(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) +{ + if (!may_use_simd()) { + if (len) + sha256_base_do_update(desc, data, len, + (sha256_block_fn *)sha256_block_data_order); + sha256_base_do_finalize(desc, + (sha256_block_fn *)sha256_block_data_order); + } else { + if (len) + sha256_update_neon(desc, data, len); + kernel_neon_begin(); + sha256_base_do_finalize(desc, + (sha256_block_fn *)sha256_block_neon); + kernel_neon_end(); + } + return sha256_base_finish(desc, out); +} + +static int sha256_final_neon(struct shash_desc *desc, u8 *out) +{ + return sha256_finup_neon(desc, NULL, 0, out); +} + +static struct shash_alg neon_algs[] = { { + .digestsize = SHA256_DIGEST_SIZE, + .init = sha256_base_init, + .update = sha256_update_neon, + .final = sha256_final_neon, + .finup = sha256_finup_neon, + .descsize = sizeof(struct sha256_state), + .base.cra_name = "sha256", + .base.cra_driver_name = "sha256-arm64-neon", + .base.cra_priority = 150, + .base.cra_blocksize = SHA256_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +}, { + .digestsize = SHA224_DIGEST_SIZE, + .init = sha224_base_init, + .update = sha256_update_neon, + .final = sha256_final_neon, + .finup = sha256_finup_neon, + .descsize = sizeof(struct sha256_state), + .base.cra_name = "sha224", + .base.cra_driver_name = "sha224-arm64-neon", + .base.cra_priority = 150, + .base.cra_blocksize = SHA224_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +} }; + +static int __init sha256_mod_init(void) +{ + int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs)); + if (ret) + return ret; + + if (elf_hwcap & HWCAP_ASIMD) { + ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs)); + if (ret) + crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); + } + return ret; +} + +static void __exit sha256_mod_fini(void) +{ + if (elf_hwcap & HWCAP_ASIMD) + crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs)); + crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); +} + +module_init(sha256_mod_init); +module_exit(sha256_mod_fini); |