From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9609823BCE7; Sun, 1 Jun 2025 22:45:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748817954; cv=none; b=J8hFCl1X7QEqofPcEUR9b4kWWPediqgCNc0d4NCc03OZRqbPmyAbGZpwaix12maE9ZNWywP0dmsY5eWZKPMlD+gDfGfdQCrnE7bI8YKzZo8gyMsNXMBg8BRsyGHX2vJ96jcpBNkv+wW5gsdRG055HVSVdt1LQIb4hzPrSQKrQL4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748817954; c=relaxed/simple; bh=DuymbRdfQNASqdv95GmKI7xo6X3aqFKpkNJXYJg46+g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=szrDzpYQhtWMZQLzBHc1b1B/hbP00nbu0hb8KdCAhtPCic5xgkyr/11VO+D6bs/hojbT9aqfI1ROfrl95E5hHhouyZZWuHYuKoRdVAPoDSUxNFCWVcOVnT8b4CBDCtMD2e7Ucl93r/WKLQSIWnBXvrYhXjBUad3IfAcxSKAbVLE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s5KZx5zF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="s5KZx5zF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 97E5FC4AF09; Sun, 1 Jun 2025 22:45:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748817954; bh=DuymbRdfQNASqdv95GmKI7xo6X3aqFKpkNJXYJg46+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s5KZx5zFP0pmjW+yPAWdh9HSDJ2eN9w2ECvi4PqHcvu7LAXDpxsbC+W620rIBoLrE DznkxM4gfP4EgC5XNbW/1IZSwXBfLwYb/IAzXBTSTWzJC4xcVQe3Kc8S5SaI7DgHDo zB1yc7zunGBGTw5P/TzAbj5R/07z6Jz4uDjDkknV7a/3ATwioeZfpMpSDAJIGlwvmZ lDcK7YxikgkmIs33oVtz5QhNny84wp9XVplAzVmdhy00Q1kCZDwflOiPDRUlhAlYk2 Eg0xXw+k7lVB/hD59SGVjKJq3uODrL4J9EKIvDT8fqH39+CwyxjA3VwspzvlJX9AJO fhH3nLtfKMqaw== From: Eric Biggers To: linux-kernel@vger.kernel.org Cc: linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org, Ard Biesheuvel , "Jason A . Donenfeld " , Linus Torvalds Subject: [PATCH 02/13] crypto/crc32c: register only one shash_alg Date: Sun, 1 Jun 2025 15:44:30 -0700 Message-ID: <20250601224441.778374-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250601224441.778374-1-ebiggers@kernel.org> References: <20250601224441.778374-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Eric Biggers Stop unnecessarily registering a "crc32c-generic" shash_alg when a "crc32c-$(ARCH)" shash_alg is registered too. While every algorithm does need to have a generic implementation to ensure uniformity of support across platforms, that doesn't mean that we need to make the generic implementation available through crypto_shash when an optimized implementation is also available. Registering the generic shash_alg did allow users of the crypto_shash or crypto_ahash APIs to request the generic implementation specifically, instead of an optimized one. However, the only known use case for that was the differential fuzz tests in crypto/testmgr.c. Equivalent test coverage is now provided by crc_kunit. Besides simplifying crypto/crc32c.c, this change eliminates the need for the library to provide crc32c_base() as part of its interface. Later patches will make crc32c_base() be internal to the library. Signed-off-by: Eric Biggers --- crypto/crc32c.c | 70 +++++++------------------------------------------ 1 file changed, 10 insertions(+), 60 deletions(-) diff --git a/crypto/crc32c.c b/crypto/crc32c.c index e5377898414a2..e160695682f16 100644 --- a/crypto/crc32c.c +++ b/crypto/crc32c.c @@ -83,19 +83,10 @@ static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, static int chksum_update(struct shash_desc *desc, const u8 *data, unsigned int length) { struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - ctx->crc = crc32c_base(ctx->crc, data, length); - return 0; -} - -static int chksum_update_arch(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - ctx->crc = crc32c(ctx->crc, data, length); return 0; } static int chksum_final(struct shash_desc *desc, u8 *out) @@ -105,17 +96,10 @@ static int chksum_final(struct shash_desc *desc, u8 *out) put_unaligned_le32(~ctx->crc, out); return 0; } static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out) -{ - put_unaligned_le32(~crc32c_base(*crcp, data, len), out); - return 0; -} - -static int __chksum_finup_arch(u32 *crcp, const u8 *data, unsigned int len, - u8 *out) { put_unaligned_le32(~crc32c(*crcp, data, len), out); return 0; } @@ -125,98 +109,64 @@ static int chksum_finup(struct shash_desc *desc, const u8 *data, struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); return __chksum_finup(&ctx->crc, data, len, out); } -static int chksum_finup_arch(struct shash_desc *desc, const u8 *data, - unsigned int len, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksum_finup_arch(&ctx->crc, data, len, out); -} - static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out) { struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); return __chksum_finup(&mctx->key, data, length, out); } -static int chksum_digest_arch(struct shash_desc *desc, const u8 *data, - unsigned int length, u8 *out) -{ - struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); - - return __chksum_finup_arch(&mctx->key, data, length, out); -} - static int crc32c_cra_init(struct crypto_tfm *tfm) { struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); mctx->key = ~0; return 0; } -static struct shash_alg algs[] = {{ +static struct shash_alg alg = { .digestsize = CHKSUM_DIGEST_SIZE, .setkey = chksum_setkey, .init = chksum_init, .update = chksum_update, .final = chksum_final, .finup = chksum_finup, .digest = chksum_digest, .descsize = sizeof(struct chksum_desc_ctx), .base.cra_name = "crc32c", - .base.cra_driver_name = "crc32c-generic", .base.cra_priority = 100, .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_blocksize = CHKSUM_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct chksum_ctx), .base.cra_module = THIS_MODULE, .base.cra_init = crc32c_cra_init, -}, { - .digestsize = CHKSUM_DIGEST_SIZE, - .setkey = chksum_setkey, - .init = chksum_init, - .update = chksum_update_arch, - .final = chksum_final, - .finup = chksum_finup_arch, - .digest = chksum_digest_arch, - .descsize = sizeof(struct chksum_desc_ctx), - - .base.cra_name = "crc32c", - .base.cra_driver_name = "crc32c-" __stringify(ARCH), - .base.cra_priority = 150, - .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, - .base.cra_blocksize = CHKSUM_BLOCK_SIZE, - .base.cra_ctxsize = sizeof(struct chksum_ctx), - .base.cra_module = THIS_MODULE, - .base.cra_init = crc32c_cra_init, -}}; - -static int num_algs; +}; static int __init crc32c_mod_init(void) { - /* register the arch flavor only if it differs from the generic one */ - num_algs = 1 + ((crc32_optimizations() & CRC32C_OPTIMIZATION) != 0); + const char *driver_name = + (crc32_optimizations() & CRC32C_OPTIMIZATION) ? + "crc32c-" __stringify(ARCH) : + "crc32c-generic"; + + strscpy(alg.base.cra_driver_name, driver_name, CRYPTO_MAX_ALG_NAME); - return crypto_register_shashes(algs, num_algs); + return crypto_register_shash(&alg); } static void __exit crc32c_mod_fini(void) { - crypto_unregister_shashes(algs, num_algs); + crypto_unregister_shash(&alg); } module_init(crc32c_mod_init); module_exit(crc32c_mod_fini); MODULE_AUTHOR("Clay Haapala "); MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CRYPTO("crc32c"); -MODULE_ALIAS_CRYPTO("crc32c-generic"); -- 2.49.0