diff options
Diffstat (limited to 'arch/arm64/crypto/sha1-ce-glue.c')
| -rw-r--r-- | arch/arm64/crypto/sha1-ce-glue.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/arm64/crypto/sha1-ce-glue.c b/arch/arm64/crypto/sha1-ce-glue.c new file mode 100644 index 0000000000..71fa4f1122 --- /dev/null +++ b/arch/arm64/crypto/sha1-ce-glue.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions + * + * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> + */ + +#include <asm/neon.h> +#include <asm/simd.h> +#include <asm/unaligned.h> +#include <crypto/internal/hash.h> +#include <crypto/internal/simd.h> +#include <crypto/sha1.h> +#include <crypto/sha1_base.h> +#include <linux/cpufeature.h> +#include <linux/crypto.h> +#include <linux/module.h> + +MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); +MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_CRYPTO("sha1"); + +struct sha1_ce_state { + struct sha1_state sst; + u32 finalize; +}; + +extern const u32 sha1_ce_offsetof_count; +extern const u32 sha1_ce_offsetof_finalize; + +asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, + int blocks); + +static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src, + int blocks) +{ + while (blocks) { + int rem; + + kernel_neon_begin(); + rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state, + sst), src, blocks); + kernel_neon_end(); + src += (blocks - rem) * SHA1_BLOCK_SIZE; + blocks = rem; + } +} + +const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); +const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); + +static int sha1_ce_update(struct shash_desc *desc, const u8 *data, + unsigned int len) +{ + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + + if (!crypto_simd_usable()) + return crypto_sha1_update(desc, data, len); + + sctx->finalize = 0; + sha1_base_do_update(desc, data, len, __sha1_ce_transform); + + return 0; +} + +static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) +{ + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; + + if (!crypto_simd_usable()) + return crypto_sha1_finup(desc, data, len, out); + + /* + * Allow the asm code to perform the finalization if there is no + * partial data and the input is a round multiple of the block size. + */ + sctx->finalize = finalize; + + sha1_base_do_update(desc, data, len, __sha1_ce_transform); + if (!finalize) + sha1_base_do_finalize(desc, __sha1_ce_transform); + return sha1_base_finish(desc, out); +} + +static int sha1_ce_final(struct shash_desc *desc, u8 *out) +{ + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + + if (!crypto_simd_usable()) + return crypto_sha1_finup(desc, NULL, 0, out); + + sctx->finalize = 0; + sha1_base_do_finalize(desc, __sha1_ce_transform); + return sha1_base_finish(desc, out); +} + +static int sha1_ce_export(struct shash_desc *desc, void *out) +{ + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + + memcpy(out, &sctx->sst, sizeof(struct sha1_state)); + return 0; +} + +static int sha1_ce_import(struct shash_desc *desc, const void *in) +{ + struct sha1_ce_state *sctx = shash_desc_ctx(desc); + + memcpy(&sctx->sst, in, sizeof(struct sha1_state)); + sctx->finalize = 0; + return 0; +} + +static struct shash_alg alg = { + .init = sha1_base_init, + .update = sha1_ce_update, + .final = sha1_ce_final, + .finup = sha1_ce_finup, + .import = sha1_ce_import, + .export = sha1_ce_export, + .descsize = sizeof(struct sha1_ce_state), + .statesize = sizeof(struct sha1_state), + .digestsize = SHA1_DIGEST_SIZE, + .base = { + .cra_name = "sha1", + .cra_driver_name = "sha1-ce", + .cra_priority = 200, + .cra_blocksize = SHA1_BLOCK_SIZE, + .cra_module = THIS_MODULE, + } +}; + +static int __init sha1_ce_mod_init(void) +{ + return crypto_register_shash(&alg); +} + +static void __exit sha1_ce_mod_fini(void) +{ + crypto_unregister_shash(&alg); +} + +module_cpu_feature_match(SHA1, sha1_ce_mod_init); +module_exit(sha1_ce_mod_fini); |