crypto: blake2s - x86_64 SIMD implementation

These implementations from Samuel Neves support AVX and AVX-512VL.
Originally this used AVX-512F, but Skylake thermal throttling made
AVX-512VL more attractive and possible to do with negligable difference.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Samuel Neves <sneves@dei.uc.pt>
Co-developed-by: Samuel Neves <sneves@dei.uc.pt>
[ardb: move to arch/x86/crypto, wire into lib/crypto framework]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 233 insertions, 0 deletions

diff --git a/arch/x86/crypto/blake2s-glue.c b/arch/x86/crypto/blake2s-glue.c
new file mode 100644
index 000000000000..4a37ba7cdbe5
--- /dev/null
+++ b/arch/x86/crypto/blake2s-glue.c
@@ -0,0 +1,233 @@
+// 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 <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(PAGE_SIZE / BLAKE2S_BLOCK_SIZE < 8);
+
+	if (!static_branch_likely(&blake2s_use_ssse3) || !crypto_simd_usable()) {
+		blake2s_compress_generic(state, block, nblocks, inc);
+		return;
+	}
+
+	for (;;) {
+		const size_t blocks = min_t(size_t, nblocks,
+					    PAGE_SIZE / 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;
+		if (!nblocks)
+			break;
+		block += blocks * BLAKE2S_BLOCK_SIZE;
+	}
+}
+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) {
+		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		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 crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
+}
+
+static void __exit blake2s_mod_exit(void)
+{
+	if (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");