From patchwork Wed Nov 14 16:01:26 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jian-Hong Pan X-Patchwork-Id: 10682893 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DAEE214D6 for ; Wed, 14 Nov 2018 16:03:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CDCE82AB39 for ; Wed, 14 Nov 2018 16:03:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C1AAD2BB28; Wed, 14 Nov 2018 16:03:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2B7D82AB39 for ; Wed, 14 Nov 2018 16:03:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728085AbeKOCHX (ORCPT ); Wed, 14 Nov 2018 21:07:23 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:40503 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728432AbeKOCHX (ORCPT ); Wed, 14 Nov 2018 21:07:23 -0500 Received: by mail-pf1-f195.google.com with SMTP id x2-v6so8123148pfm.7 for ; Wed, 14 Nov 2018 08:03:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=g.ncu.edu.tw; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FKT2FISMHyv8N3RNIMgKnskSouz7U+T77FZX5SCipNI=; b=Xe2o+RGU3sDy1iJDIH1MyLPEML1Ft1xD37Su332rVOhPMdqBWW8aRD9WQlVMm68B5s pQJ+/0xnT9A2nOGo6svH84cz4jmoj6qEFsxMoarWHUz5TzvXSMsESdHv5odwr0vvrk3G bbhT6gzTxC0WXW0TSPWbKtRhQQeynOymODbtc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FKT2FISMHyv8N3RNIMgKnskSouz7U+T77FZX5SCipNI=; b=llWoxffWMJMHznZGsJMVlkQ2cXxtrZNkfsTYn2FRLlqhHLkV4hDgqMhUiO2Q4te3s3 1IvFiF2+vxVGhEbi2J/p8cst5IYrmzIM0wK79eETUXYWW+vg3TFZg6kvTnb6OjsL2OLm qn78tPDyIjvcktHVdNkP9l4b3qGjuPYlZeJPwtcDHrQh7uK/gr4MHu61XvMTfsoKgBzt GJ+JGpixgowR8EZZ2cp0HMMbTMdk6K/ItVRO9WMxgW7dZXbEakrO+MIs8u/NNj46MG3U xivgWdwDglAFgocrNLLI6eZ1GIPAHKTkuxxDI+8JkATNFA41wBPGOjSkieQJTtMRwRMZ uMbw== X-Gm-Message-State: AGRZ1gJmZ9l0GWd657+yF9YnAARarA/YYcNhgNQy9PdyZxPac0Yed3uE A3DEiVI9E0dlOq8ojd/XxN2G8w== X-Google-Smtp-Source: AJdET5cRBkyXFJvUKq3VCfQxAZsyxYt/N0oZLeiEwqFa9U4pj3eupedXYixZEDOCSc9ct0Q5uqt3kg== X-Received: by 2002:a62:6fc7:: with SMTP id k190-v6mr2547163pfc.97.1542211413417; Wed, 14 Nov 2018 08:03:33 -0800 (PST) Received: from starnight.local ([150.116.248.145]) by smtp.gmail.com with ESMTPSA id s2-v6sm53449854pfk.133.2018.11.14.08.03.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Nov 2018 08:03:32 -0800 (PST) From: Jian-Hong Pan To: =?utf-8?q?Andreas_F=C3=A4rber?= , "David S . Miller" Cc: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Marcel Holtmann , Dollar Chen , Ken Yu , linux-wpan@vger.kernel.org, Stefan Schmidt , Jian-Hong Pan Subject: [PATCH V3 5/7] net: maclorawan: Implement the crypto of maclorawan module Date: Thu, 15 Nov 2018 00:01:26 +0800 Message-Id: <20181114160126.4445-6-starnight@g.ncu.edu.tw> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181105.101610.1437737564548154497.davem@davemloft.net> References: <20181105.101610.1437737564548154497.davem@davemloft.net> MIME-Version: 1.0 Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implement the crypto for encryption/decryption and message integrity code (MIC) according to LoRaWAN(TM) Specification Ver. 1.0.2. Signed-off-by: Jian-Hong Pan --- V2: - Split the LoRaWAN class module patch in V1 into LoRaWAN socket and LoRaWAN Soft MAC modules - Rename the lrwsec files to crypto files - Modify for Big/Little-Endian - Use SPDX license identifiers V3: - Order local variables from longest to shortest line in the functions net/maclorawan/crypto.c | 209 ++++++++++++++++++++++++++++++++++++++++ net/maclorawan/crypto.h | 27 ++++++ 2 files changed, 236 insertions(+) create mode 100644 net/maclorawan/crypto.c create mode 100644 net/maclorawan/crypto.h diff --git a/net/maclorawan/crypto.c b/net/maclorawan/crypto.c new file mode 100644 index 000000000000..5337a661c9d0 --- /dev/null +++ b/net/maclorawan/crypto.c @@ -0,0 +1,209 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */ +/*- + * LoRaWAN soft MAC + * + * Copyright (c) 2018 Jian-Hong, Pan + * + */ + +#include +#include +#include +#include "crypto.h" + +struct crypto_shash * +lrw_mic_key_setup(u8 *k, size_t k_len) +{ + struct crypto_shash *tfm; + char *algo = "cmac(aes)"; + int err; + + tfm = crypto_alloc_shash(algo, 0, 0); + if (!IS_ERR(tfm)) { + err = crypto_shash_setkey(tfm, k, k_len); + if (err) { + crypto_free_shash(tfm); + tfm = NULL; + } + } + + return tfm; +} + +int +lrw_aes_cmac(struct crypto_shash *tfm, u8 *bz, u8 *data, size_t len, u8 *out) +{ + SHASH_DESC_ON_STACK(desc, tfm); + int err; + + desc->tfm = tfm; + + err = crypto_shash_init(desc); + if (err) + goto lrw_aes_cmac_end; + + err = crypto_shash_update(desc, bz, 16); + if (err) + goto lrw_aes_cmac_end; + + err = crypto_shash_update(desc, data, len); + if (err) + goto lrw_aes_cmac_end; + + err = crypto_shash_final(desc, out); + +lrw_aes_cmac_end: + return err; +} + +int +lrw_set_bzero(u8 dir, u32 devaddr, u32 fcnt, u8 len, u8 *bz) +{ + __le32 le_devaddr = cpu_to_le32(devaddr); + __le32 le_fcnt = cpu_to_le32(fcnt); + + bz[0] = 0x49; + memset(bz + 1, 0x00, 4); + bz[5] = dir; + memcpy(bz + 6, &le_devaddr, 4); + memcpy(bz + 10, &le_fcnt, 4); + bz[14] = 0x00; + bz[15] = len; + + return 0; +} + +int +lrw_calc_mic(struct crypto_shash *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8* buf, size_t len, u8 *mic4) +{ + u8 mic[16]; + u8 bz[16]; + int err; + + /* According to LoRaWAN Specification Version 1.0.2 + * - 4.4 Massege Integrity Code (MIC) */ + lrw_set_bzero(dir, devaddr, fcnt, len, bz); + err = lrw_aes_cmac(tfm, bz, buf, len, mic); + if (!err) + memcpy(mic4, mic, 4); + + return err; +} + +void +lrw_mic_key_free(struct crypto_shash *tfm) +{ + crypto_free_shash(tfm); +} + +struct crypto_skcipher * +lrw_aes_enc_key_setup(char *algo, u8 *k, size_t k_len) +{ + struct crypto_skcipher *tfm; + int err; + + tfm = crypto_alloc_skcipher(algo, 0, CRYPTO_ALG_ASYNC); + if (!IS_ERR(tfm)) { + err = crypto_skcipher_setkey(tfm, k, k_len); + if (err) { + crypto_free_skcipher(tfm); + tfm = NULL; + } + } + + return tfm; +} + +struct crypto_skcipher * +lrw_encrypt_key_setup(u8 *k, size_t k_len) +{ + return lrw_aes_enc_key_setup("cbc(aes)", k, k_len); +} + +int +lrw_aes_enc(struct crypto_skcipher *tfm, u8 *in, size_t len, u8 *out) +{ + SKCIPHER_REQUEST_ON_STACK(req, tfm); + struct scatterlist src, dst; + u8 iv[16]; + int err; + + memset(iv, 0, 16); + /* The buffer for sg_init_one cannot be a global or const local + * (will confuse the scatterlist) */ + sg_init_one(&src, in, len); + sg_init_one(&dst, out, len); + + skcipher_request_set_tfm(req, tfm); + skcipher_request_set_callback(req, 0, NULL, NULL); + skcipher_request_set_crypt(req, &src, &dst, len, iv); + err = crypto_skcipher_encrypt(req); + skcipher_request_zero(req); + + return err; +} + +#define LRW_SEQUENCE_OF_BLOCK_LEN 16 + +int +lrw_set_sob(u8 dir, u32 devaddr, u32 fcnt, u8 index, u8 *sob) +{ + __le32 le_devaddr = cpu_to_le32(devaddr); + __le32 _fcnt = cpu_to_le32(fcnt); + + sob[0] = 0x01; + memset(sob + 1, 0x00, 4); + sob[5] = dir; + memcpy(sob + 6, &le_devaddr, 4); + memcpy(sob + 10, &_fcnt, 4); + sob[14] = 0x00; + sob[15] = index; + + return 0; +} + +int +lrw_encrypt_sob(struct crypto_skcipher *tfm, u8 *sob) +{ + return lrw_aes_enc(tfm, sob, LRW_SEQUENCE_OF_BLOCK_LEN, sob); +} + +int +lrw_encrypt_buf(struct crypto_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len) +{ + u8 sob[LRW_SEQUENCE_OF_BLOCK_LEN]; + u8 i, j; + + /* According to LoRaWAN Specification Version 1.0.2 + * - 4.3.3 MAC Frame Payload Encryption (FRMPayload) */ + for (i = 0; (i * LRW_SEQUENCE_OF_BLOCK_LEN) < len; i++) { + lrw_set_sob(dir, devaddr, fcnt, i, sob); + lrw_encrypt_sob(tfm, sob); + for (j = 0; (i * LRW_SEQUENCE_OF_BLOCK_LEN + j) < len; j++) + buf[i * LRW_SEQUENCE_OF_BLOCK_LEN + j] ^= sob[j]; + } + + return 0; +} + +int +lrw_decrypt_buf(struct crypto_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len) +{ + /* Accoding to XOR swap algorithm */ + return lrw_encrypt_buf(tfm, dir, devaddr, fcnt, buf, len); +} + +void +lrw_aes_enc_key_free(struct crypto_skcipher *tfm) +{ + crypto_free_skcipher(tfm); +} + +void +lrw_encrypt_key_free(struct crypto_skcipher *tfm) +{ + lrw_aes_enc_key_free(tfm); +} diff --git a/net/maclorawan/crypto.h b/net/maclorawan/crypto.h new file mode 100644 index 000000000000..2ede02efb8c6 --- /dev/null +++ b/net/maclorawan/crypto.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */ +/*- + * LoRaWAN soft MAC + * + * Copyright (c) 2018 Jian-Hong, Pan + * + */ + +#ifndef __LORAWAN_CRYPTO_H__ +#define __LORAWAN_CRYPTO_H__ + +#include +#include + +struct crypto_shash *lrw_mic_key_setup(u8 *k, size_t k_len); +int lrw_calc_mic(struct crypto_shash *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8* buf, size_t len, u8 *mic4); +void lrw_mic_key_free(struct crypto_shash *tfm); + +struct crypto_skcipher *lrw_encrypt_key_setup(u8 *k, size_t k_len); +int lrw_encrypt_buf(struct crypto_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len); +int lrw_decrypt_buf(struct crypto_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len); +void lrw_encrypt_key_free(struct crypto_skcipher *tfm); + +#endif