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195 lines
5.4 KiB
195 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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. <[email protected]> |
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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/internal/simd.h> |
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#include <crypto/sha2.h> |
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#include <crypto/sha256_base.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 <[email protected]>"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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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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static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src, |
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int blocks) |
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{ |
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sha256_block_data_order(sst->state, src, blocks); |
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} |
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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 void __sha256_block_neon(struct sha256_state *sst, u8 const *src, |
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int blocks) |
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{ |
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sha256_block_neon(sst->state, src, blocks); |
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} |
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static int crypto_sha256_arm64_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_data_order); |
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} |
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static int crypto_sha256_arm64_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_data_order); |
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sha256_base_do_finalize(desc, __sha256_block_data_order); |
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return sha256_base_finish(desc, out); |
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} |
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static int crypto_sha256_arm64_final(struct shash_desc *desc, u8 *out) |
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{ |
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return crypto_sha256_arm64_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 = crypto_sha256_arm64_update, |
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.final = crypto_sha256_arm64_final, |
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.finup = crypto_sha256_arm64_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 = 125, |
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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 = crypto_sha256_arm64_update, |
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.final = crypto_sha256_arm64_final, |
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.finup = crypto_sha256_arm64_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 = 125, |
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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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struct sha256_state *sctx = shash_desc_ctx(desc); |
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if (!crypto_simd_usable()) |
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return sha256_base_do_update(desc, data, len, |
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__sha256_block_data_order); |
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while (len > 0) { |
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unsigned int chunk = len; |
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/* |
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* Don't hog the CPU for the entire time it takes to process all |
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* input when running on a preemptible kernel, but process the |
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* data block by block instead. |
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*/ |
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if (IS_ENABLED(CONFIG_PREEMPTION) && |
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chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE) |
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chunk = SHA256_BLOCK_SIZE - |
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sctx->count % SHA256_BLOCK_SIZE; |
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kernel_neon_begin(); |
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sha256_base_do_update(desc, data, chunk, __sha256_block_neon); |
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kernel_neon_end(); |
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data += chunk; |
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len -= chunk; |
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} |
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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 (!crypto_simd_usable()) { |
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if (len) |
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sha256_base_do_update(desc, data, len, |
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__sha256_block_data_order); |
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sha256_base_do_finalize(desc, __sha256_block_data_order); |
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} else { |
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if (len) |
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sha256_update_neon(desc, data, len); |
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kernel_neon_begin(); |
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sha256_base_do_finalize(desc, __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_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_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 (cpu_have_named_feature(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 (cpu_have_named_feature(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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