// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */ #include <crypto/internal/blake2s.h> #include <crypto/internal/simd.h> #include <crypto/internal/hash.h> #include <linux/types.h> #include <linux/jump_label.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/sizes.h> #include <asm/cpufeature.h> #include <asm/fpu/api.h> #include <asm/processor.h> #include <asm/simd.h> asmlinkage void blake2s_compress_ssse3(struct blake2s_state *state, const u8 *block, const size_t nblocks, const u32 inc); asmlinkage void blake2s_compress_avx512(struct blake2s_state *state, const u8 *block, const size_t nblocks, const u32 inc); static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3); static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512); void blake2s_compress_arch(struct blake2s_state *state, const u8 *block, size_t nblocks, const u32 inc) { /* SIMD disables preemption, so relax after processing each page. */ BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8); if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) { blake2s_compress_generic(state, block, nblocks, inc); return; } do { const size_t blocks = min_t(size_t, nblocks, SZ_4K / BLAKE2S_BLOCK_SIZE); kernel_fpu_begin(); if (IS_ENABLED(CONFIG_AS_AVX512) && static_branch_likely(&blake2s_use_avx512)) blake2s_compress_avx512(state, block, blocks, inc); else blake2s_compress_ssse3(state, block, blocks, inc); kernel_fpu_end(); nblocks -= blocks; block += blocks * BLAKE2S_BLOCK_SIZE; } while (nblocks); } EXPORT_SYMBOL(blake2s_compress_arch); static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm); if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) return -EINVAL; memcpy(tctx->key, key, keylen); tctx->keylen = keylen; return 0; } static int crypto_blake2s_init(struct shash_desc *desc) { struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); struct blake2s_state *state = shash_desc_ctx(desc); const int outlen = crypto_shash_digestsize(desc->tfm); if (tctx->keylen) blake2s_init_key(state, outlen, tctx->key, tctx->keylen); else blake2s_init(state, outlen); return 0; } static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in, unsigned int inlen) { struct blake2s_state *state = shash_desc_ctx(desc); const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen; if (unlikely(!inlen)) return 0; if (inlen > fill) { memcpy(state->buf + state->buflen, in, fill); blake2s_compress_arch(state, state->buf, 1, BLAKE2S_BLOCK_SIZE); state->buflen = 0; in += fill; inlen -= fill; } if (inlen > BLAKE2S_BLOCK_SIZE) { const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE); /* Hash one less (full) block than strictly possible */ blake2s_compress_arch(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE); in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); } memcpy(state->buf + state->buflen, in, inlen); state->buflen += inlen; return 0; } static int crypto_blake2s_final(struct shash_desc *desc, u8 *out) { struct blake2s_state *state = shash_desc_ctx(desc); blake2s_set_lastblock(state); memset(state->buf + state->buflen, 0, BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */ blake2s_compress_arch(state, state->buf, 1, state->buflen); cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); memcpy(out, state->h, state->outlen); memzero_explicit(state, sizeof(*state)); return 0; } static struct shash_alg blake2s_algs[] = {{ .base.cra_name = "blake2s-128", .base.cra_driver_name = "blake2s-128-x86", .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx), .base.cra_priority = 200, .base.cra_blocksize = BLAKE2S_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .digestsize = BLAKE2S_128_HASH_SIZE, .setkey = crypto_blake2s_setkey, .init = crypto_blake2s_init, .update = crypto_blake2s_update, .final = crypto_blake2s_final, .descsize = sizeof(struct blake2s_state), }, { .base.cra_name = "blake2s-160", .base.cra_driver_name = "blake2s-160-x86", .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx), .base.cra_priority = 200, .base.cra_blocksize = BLAKE2S_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .digestsize = BLAKE2S_160_HASH_SIZE, .setkey = crypto_blake2s_setkey, .init = crypto_blake2s_init, .update = crypto_blake2s_update, .final = crypto_blake2s_final, .descsize = sizeof(struct blake2s_state), }, { .base.cra_name = "blake2s-224", .base.cra_driver_name = "blake2s-224-x86", .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx), .base.cra_priority = 200, .base.cra_blocksize = BLAKE2S_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .digestsize = BLAKE2S_224_HASH_SIZE, .setkey = crypto_blake2s_setkey, .init = crypto_blake2s_init, .update = crypto_blake2s_update, .final = crypto_blake2s_final, .descsize = sizeof(struct blake2s_state), }, { .base.cra_name = "blake2s-256", .base.cra_driver_name = "blake2s-256-x86", .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx), .base.cra_priority = 200, .base.cra_blocksize = BLAKE2S_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .digestsize = BLAKE2S_256_HASH_SIZE, .setkey = crypto_blake2s_setkey, .init = crypto_blake2s_init, .update = crypto_blake2s_update, .final = crypto_blake2s_final, .descsize = sizeof(struct blake2s_state), }}; static int __init blake2s_mod_init(void) { if (!boot_cpu_has(X86_FEATURE_SSSE3)) return 0; static_branch_enable(&blake2s_use_ssse3); if (IS_ENABLED(CONFIG_AS_AVX512) && boot_cpu_has(X86_FEATURE_AVX) && boot_cpu_has(X86_FEATURE_AVX2) && boot_cpu_has(X86_FEATURE_AVX512F) && boot_cpu_has(X86_FEATURE_AVX512VL) && cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_AVX512, NULL)) static_branch_enable(&blake2s_use_avx512); return IS_REACHABLE(CONFIG_CRYPTO_HASH) ? crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs)) : 0; } static void __exit blake2s_mod_exit(void) { if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3)) crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs)); } module_init(blake2s_mod_init); module_exit(blake2s_mod_exit); MODULE_ALIAS_CRYPTO("blake2s-128"); MODULE_ALIAS_CRYPTO("blake2s-128-x86"); MODULE_ALIAS_CRYPTO("blake2s-160"); MODULE_ALIAS_CRYPTO("blake2s-160-x86"); MODULE_ALIAS_CRYPTO("blake2s-224"); MODULE_ALIAS_CRYPTO("blake2s-224-x86"); MODULE_ALIAS_CRYPTO("blake2s-256"); MODULE_ALIAS_CRYPTO("blake2s-256-x86"); MODULE_LICENSE("GPL v2");