From nobody Sat Feb 7 08:42:48 2026 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 B325C321F5E; Mon, 12 Jan 2026 19:23:19 +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=1768245799; cv=none; b=uHA7HNPRzTiv+Yugh5fDV63AaD9pTRzP4WpdvWfsPRyndQ+AJafpJs5kFWxxWx7+9dvEFsSVBN1ZfZNbmv0DcSBFu8q0O2WSi1bOi4K3Myb/r13q/J2tbp//CjLwEAoeK1tL2Hi3kfqMm1RXmY8P5+3dJ8gi3/zSrEC9ep8GCz0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768245799; c=relaxed/simple; bh=bpasNFXQc6Wz1acJi7F8zoXotEra0E6njU13yRy/Zpo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GHZxNYWsXpRwlWA1bCC+gefx45+0hse4r9Xx1DRZv/caf/84zNenXc2Kt57MPiJZVhOxfZmk/d3Aat7mqUN1ZRJQTASwATris3Nigqj07Ff6aEp1brjd042EJBZbcDEPte1JNeBxebyaVsSDanvQjzal7e4ZM3FD3tNWgcgZuvU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M9YtHnsm; 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="M9YtHnsm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 09E2AC16AAE; Mon, 12 Jan 2026 19:23:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768245799; bh=bpasNFXQc6Wz1acJi7F8zoXotEra0E6njU13yRy/Zpo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M9YtHnsm+ldZf23bnl1+cxTAchjTl4Cd/yzclRF+f4Oj/et0RausQ5Oadm19mXLwg BLQELCVbt4AztqKG1kIDz6Bho14907cqL2oynonqpIr8CEPzPvUqcoXXNw0tRXK2kZ B11s2jXLqUowVR8nlVw1Gjb1kB+QyAmC//kgi7XVs6qrKBgV5041cobEvPE1Lcno4t jqsMu5edutyGGdux6+UrEsMtxmpdBNCNZrdk8kNkz9CJ0vjJcnow0U8B5LkRpIixkX zzsrod/0VLmFRXTNk183p/Umtn+c743dVF1MZu+ug045MuLxptHuyFrrkrgJo+BS65 DXTthzlvmNv/Q== From: Eric Biggers To: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel , "Jason A . Donenfeld" , Herbert Xu , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org, Holger Dengler , Harald Freudenberger , Eric Biggers Subject: [PATCH v2 03/35] crypto: arm/aes-neonbs - Use AES library for single blocks Date: Mon, 12 Jan 2026 11:20:01 -0800 Message-ID: <20260112192035.10427-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260112192035.10427-1-ebiggers@kernel.org> References: <20260112192035.10427-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" aes-neonbs-glue.c calls __aes_arm_encrypt() and __aes_arm_decrypt() to en/decrypt single blocks for CBC encryption, XTS tweak encryption, and XTS ciphertext stealing. In preparation for making the AES library use this same ARM-optimized single-block AES en/decryption code and making it an internal implementation detail of the AES library, replace the calls to these functions with calls to the AES library. Note that this reduces the size of the aesbs_cbc_ctx and aesbs_xts_ctx structs, since unnecessary decryption round keys are no longer included. Acked-by: Ard Biesheuvel Signed-off-by: Eric Biggers --- arch/arm/crypto/Kconfig | 1 - arch/arm/crypto/aes-neonbs-glue.c | 29 ++++++++++++++++------------- 2 files changed, 16 insertions(+), 14 deletions(-) diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig index 3eb5071bea14..167a648a9def 100644 --- a/arch/arm/crypto/Kconfig +++ b/arch/arm/crypto/Kconfig @@ -42,11 +42,10 @@ config CRYPTO_AES_ARM such attacks very difficult. =20 config CRYPTO_AES_ARM_BS tristate "Ciphers: AES, modes: ECB/CBC/CTR/XTS (bit-sliced NEON)" depends on KERNEL_MODE_NEON - select CRYPTO_AES_ARM select CRYPTO_SKCIPHER select CRYPTO_LIB_AES help Length-preserving ciphers: AES cipher algorithms (FIPS-197) with block cipher modes: diff --git a/arch/arm/crypto/aes-neonbs-glue.c b/arch/arm/crypto/aes-neonbs= -glue.c index df5afe601e4a..c49ddafc54f3 100644 --- a/arch/arm/crypto/aes-neonbs-glue.c +++ b/arch/arm/crypto/aes-neonbs-glue.c @@ -10,11 +10,10 @@ #include #include #include #include #include -#include "aes-cipher.h" =20 MODULE_AUTHOR("Ard Biesheuvel "); MODULE_DESCRIPTION("Bit sliced AES using NEON instructions"); MODULE_LICENSE("GPL v2"); =20 @@ -46,17 +45,17 @@ struct aesbs_ctx { u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32] __aligned(AES_BLOCK_SIZE); }; =20 struct aesbs_cbc_ctx { struct aesbs_ctx key; - struct crypto_aes_ctx fallback; + struct aes_enckey fallback; }; =20 struct aesbs_xts_ctx { struct aesbs_ctx key; - struct crypto_aes_ctx fallback; - struct crypto_aes_ctx tweak_key; + struct aes_key fallback; + struct aes_enckey tweak_key; }; =20 static int aesbs_setkey(struct crypto_skcipher *tfm, const u8 *in_key, unsigned int key_len) { @@ -120,18 +119,23 @@ static int aesbs_cbc_setkey(struct crypto_skcipher *t= fm, const u8 *in_key, unsigned int key_len) { struct aesbs_cbc_ctx *ctx =3D crypto_skcipher_ctx(tfm); int err; =20 - err =3D aes_expandkey(&ctx->fallback, in_key, key_len); + err =3D aes_prepareenckey(&ctx->fallback, in_key, key_len); if (err) return err; =20 ctx->key.rounds =3D 6 + key_len / 4; =20 + /* + * Note: this assumes that the arm implementation of the AES library + * stores the standard round keys in k.rndkeys. + */ kernel_neon_begin(); - aesbs_convert_key(ctx->key.rk, ctx->fallback.key_enc, ctx->key.rounds); + aesbs_convert_key(ctx->key.rk, ctx->fallback.k.rndkeys, + ctx->key.rounds); kernel_neon_end(); =20 return 0; } =20 @@ -150,12 +154,11 @@ static int cbc_encrypt(struct skcipher_request *req) u8 *dst =3D walk.dst.virt.addr; u8 *prev =3D walk.iv; =20 do { crypto_xor_cpy(dst, src, prev, AES_BLOCK_SIZE); - __aes_arm_encrypt(ctx->fallback.key_enc, - ctx->key.rounds, dst, dst); + aes_encrypt(&ctx->fallback, dst, dst); prev =3D dst; src +=3D AES_BLOCK_SIZE; dst +=3D AES_BLOCK_SIZE; nbytes -=3D AES_BLOCK_SIZE; } while (nbytes >=3D AES_BLOCK_SIZE); @@ -237,14 +240,14 @@ static int aesbs_xts_setkey(struct crypto_skcipher *t= fm, const u8 *in_key, err =3D xts_verify_key(tfm, in_key, key_len); if (err) return err; =20 key_len /=3D 2; - err =3D aes_expandkey(&ctx->fallback, in_key, key_len); + err =3D aes_preparekey(&ctx->fallback, in_key, key_len); if (err) return err; - err =3D aes_expandkey(&ctx->tweak_key, in_key + key_len, key_len); + err =3D aes_prepareenckey(&ctx->tweak_key, in_key + key_len, key_len); if (err) return err; =20 return aesbs_setkey(tfm, in_key, key_len); } @@ -277,11 +280,11 @@ static int __xts_crypt(struct skcipher_request *req, = bool encrypt, =20 err =3D skcipher_walk_virt(&walk, req, true); if (err) return err; =20 - __aes_arm_encrypt(ctx->tweak_key.key_enc, rounds, walk.iv, walk.iv); + aes_encrypt(&ctx->tweak_key, walk.iv, walk.iv); =20 while (walk.nbytes >=3D AES_BLOCK_SIZE) { unsigned int blocks =3D walk.nbytes / AES_BLOCK_SIZE; int reorder_last_tweak =3D !encrypt && tail > 0; =20 @@ -309,13 +312,13 @@ static int __xts_crypt(struct skcipher_request *req, = bool encrypt, scatterwalk_map_and_copy(buf, req->src, req->cryptlen, tail, 0); =20 crypto_xor(buf, req->iv, AES_BLOCK_SIZE); =20 if (encrypt) - __aes_arm_encrypt(ctx->fallback.key_enc, rounds, buf, buf); + aes_encrypt(&ctx->fallback, buf, buf); else - __aes_arm_decrypt(ctx->fallback.key_dec, rounds, buf, buf); + aes_decrypt(&ctx->fallback, buf, buf); =20 crypto_xor(buf, req->iv, AES_BLOCK_SIZE); =20 scatterwalk_map_and_copy(buf, req->dst, req->cryptlen - AES_BLOCK_SIZE, AES_BLOCK_SIZE + tail, 1); --=20 2.52.0