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[209.51.188.17]) by mx.google.com with ESMTPS id t4si5303736ybp.211.2020.09.10.03.12.45 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 10 Sep 2020 03:12:45 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=QI0w8kCO; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:41844 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kGJZM-0003GZ-S6 for patch@linaro.org; Thu, 10 Sep 2020 06:12:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43718) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kGJTb-0000Sh-Me for qemu-devel@nongnu.org; Thu, 10 Sep 2020 06:06:47 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:32364 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kGJTZ-0007iL-8M for qemu-devel@nongnu.org; Thu, 10 Sep 2020 06:06:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599732404; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Yq0dLty2zOPZXtWacMEsSs09G1z6ITTkf3f7aeY0XKI=; b=QI0w8kCOsoqTFJrh7Rwx0Y2xGs+eR/vQb6LrBgRMgyyZO+EROS7a3V61hcXVnFT/L074ym 26weHqh6yKFH7nJc9j4JpyEU/BNf6J5mwhuMiCrGrNLHHxxcBFCS4RqAqOrQOIHu/azhF2 Ba0890On0WE+obe4Zfdmig6C3IZEntA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-152-grfCSkOxNSeMiHmFzGDQmA-1; Thu, 10 Sep 2020 06:06:42 -0400 X-MC-Unique: grfCSkOxNSeMiHmFzGDQmA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A380B1009443; Thu, 10 Sep 2020 10:06:41 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-112-4.ams2.redhat.com [10.36.112.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9BEE91002D41; Thu, 10 Sep 2020 10:06:40 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PULL 11/17] crypto/builtin: Remove odd-sized AES block handling Date: Thu, 10 Sep 2020 11:06:17 +0100 Message-Id: <20200910100623.1088965-12-berrange@redhat.com> In-Reply-To: <20200910100623.1088965-1-berrange@redhat.com> References: <20200910100623.1088965-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/10 01:44:54 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , =?utf-8?q?Daniel_P?= =?utf-8?b?LiBCZXJyYW5nw6k=?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson We verified that the data block is properly sized modulo AES_BLOCK_SIZE within qcrypto_builtin_cipher_{en,de}crypt. Therefore we will never have to handle odd sized blocks. Signed-off-by: Richard Henderson Signed-off-by: Daniel P. Berrangé --- crypto/cipher-builtin.c.inc | 40 +++++++++++-------------------------- 1 file changed, 12 insertions(+), 28 deletions(-) -- 2.26.2 diff --git a/crypto/cipher-builtin.c.inc b/crypto/cipher-builtin.c.inc index 1444139f36..e2ae5d090c 100644 --- a/crypto/cipher-builtin.c.inc +++ b/crypto/cipher-builtin.c.inc @@ -80,21 +80,13 @@ static void qcrypto_cipher_aes_ecb_encrypt(const AES_KEY *key, { const uint8_t *inptr = in; uint8_t *outptr = out; + + /* We have already verified that len % AES_BLOCK_SIZE == 0. */ while (len) { - if (len > AES_BLOCK_SIZE) { - AES_encrypt(inptr, outptr, key); - inptr += AES_BLOCK_SIZE; - outptr += AES_BLOCK_SIZE; - len -= AES_BLOCK_SIZE; - } else { - uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE]; - memcpy(tmp1, inptr, len); - /* Fill with 0 to avoid valgrind uninitialized reads */ - memset(tmp1 + len, 0, sizeof(tmp1) - len); - AES_encrypt(tmp1, tmp2, key); - memcpy(outptr, tmp2, len); - len = 0; - } + AES_encrypt(inptr, outptr, key); + inptr += AES_BLOCK_SIZE; + outptr += AES_BLOCK_SIZE; + len -= AES_BLOCK_SIZE; } } @@ -106,21 +98,13 @@ static void qcrypto_cipher_aes_ecb_decrypt(const AES_KEY *key, { const uint8_t *inptr = in; uint8_t *outptr = out; + + /* We have already verified that len % AES_BLOCK_SIZE == 0. */ while (len) { - if (len > AES_BLOCK_SIZE) { - AES_decrypt(inptr, outptr, key); - inptr += AES_BLOCK_SIZE; - outptr += AES_BLOCK_SIZE; - len -= AES_BLOCK_SIZE; - } else { - uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE]; - memcpy(tmp1, inptr, len); - /* Fill with 0 to avoid valgrind uninitialized reads */ - memset(tmp1 + len, 0, sizeof(tmp1) - len); - AES_decrypt(tmp1, tmp2, key); - memcpy(outptr, tmp2, len); - len = 0; - } + AES_decrypt(inptr, outptr, key); + inptr += AES_BLOCK_SIZE; + outptr += AES_BLOCK_SIZE; + len -= AES_BLOCK_SIZE; } }