From patchwork Tue Dec 4 14:13:41 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: 10711831 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 1685118A7 for ; Tue, 4 Dec 2018 14:15:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 08C592A780 for ; Tue, 4 Dec 2018 14:15:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F0AEF2AA03; Tue, 4 Dec 2018 14:15:45 +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 578E22A780 for ; Tue, 4 Dec 2018 14:15:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726748AbeLDOPn (ORCPT ); Tue, 4 Dec 2018 09:15:43 -0500 Received: from mail-pg1-f196.google.com ([209.85.215.196]:46967 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726745AbeLDOPn (ORCPT ); Tue, 4 Dec 2018 09:15:43 -0500 Received: by mail-pg1-f196.google.com with SMTP id w7so7421595pgp.13 for ; Tue, 04 Dec 2018 06:15:41 -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=ytv1cVXpRljGfxPS2GlCpo+dCCVwID6zj0f5fmzf1uM=; b=cxFvVBhvR03pzVBh5BBs+bt8HA+laXWMlIBnoX641jWSzhVI1Dfn+kaXcRtB+mrPcH U4tIPSrundX+c/3ARbT7q+aHz/1rciydBf+Q30yn2mos8H8PbWdPG3Kt4syBhAR3lHn7 FKQ+pS8bCBsJgDwnI/HenGp5i8xwuefE8SbJ8= 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=ytv1cVXpRljGfxPS2GlCpo+dCCVwID6zj0f5fmzf1uM=; b=rs1ItmBhKCPXy4JKowmfc86MBphTvQ4EhF92eO5qRii7zPzy0uobp3gx46biVKwCwu hlcvrPGz8NqG3CR8Oefkb6dO7g6skTJtmVs/oohz1CCXVZJowPLglqEZxcSN7ZPOCvFX cZE3D1W/ggWBHde81AYNPZSuG7uLVXdVdpjclMpbczSboyqA82z0FMaDADAA2WtL7OFJ Ams4y7uV6TS64Jvi0xFByEc54JsyLzHXsc3PXMFyJTE35gDKUQ0nQIQpVHoAnPrDeNuE RiV2yPAZfYD5cfJvloLA4BG6bs9B8X3IiUy1T8mMFLl/63rkBRpN237D3E4ZyDrsj4zh KyOw== X-Gm-Message-State: AA+aEWZS5AnP3cShA/CXjZ7mXoh5p0tZ172JpUgBXu7DegT5LF49ouQy AhqjOCLwZgRP5yCH69bVhpbLcQ== X-Google-Smtp-Source: AFSGD/XfACY41/aOz7I7Z4emP5ODuI3J85+x+j7KicG3oIVyanrXqtXeVg1bb/L4PTNhFZiHXBwyQg== X-Received: by 2002:a63:42c1:: with SMTP id p184mr16715011pga.202.1543932941254; Tue, 04 Dec 2018 06:15:41 -0800 (PST) Received: from starnight.local ([150.116.248.145]) by smtp.gmail.com with ESMTPSA id n66sm36975863pfk.19.2018.12.04.06.15.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Dec 2018 06:15:40 -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 V4 4/6] net: maclorawan: Implement the crypto of maclorawan module Date: Tue, 4 Dec 2018 22:13:41 +0800 Message-Id: <20181204141341.4353-5-starnight@g.ncu.edu.tw> X-Mailer: git-send-email 2.19.2 In-Reply-To: References: 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 V4: - Fix by coding style report from scripts/checkpatch.pl net/maclorawan/crypto.c | 212 ++++++++++++++++++++++++++++++++++++++++ net/maclorawan/crypto.h | 27 +++++ 2 files changed, 239 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..0ae9d211cd14 --- /dev/null +++ b/net/maclorawan/crypto.c @@ -0,0 +1,212 @@ +// 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_sync_skcipher * +lrw_aes_enc_key_setup(char *algo, u8 *k, size_t k_len) +{ + struct crypto_sync_skcipher *tfm; + int err; + + tfm = crypto_alloc_sync_skcipher(algo, 0, CRYPTO_ALG_ASYNC); + if (!IS_ERR(tfm)) { + err = crypto_sync_skcipher_setkey(tfm, k, k_len); + if (err) { + crypto_free_sync_skcipher(tfm); + tfm = NULL; + } + } + + return tfm; +} + +struct crypto_sync_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_sync_skcipher *tfm, u8 *in, size_t len, u8 *out) +{ + SYNC_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_sync_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_sync_skcipher *tfm, u8 *sob) +{ + return lrw_aes_enc(tfm, sob, LRW_SEQUENCE_OF_BLOCK_LEN, sob); +} + +int +lrw_encrypt_buf(struct crypto_sync_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_sync_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len) +{ + /* According to XOR swap algorithm */ + return lrw_encrypt_buf(tfm, dir, devaddr, fcnt, buf, len); +} + +void +lrw_aes_enc_key_free(struct crypto_sync_skcipher *tfm) +{ + crypto_free_sync_skcipher(tfm); +} + +void +lrw_encrypt_key_free(struct crypto_sync_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..22dd810040c0 --- /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_sync_skcipher *lrw_encrypt_key_setup(u8 *k, size_t k_len); +int lrw_encrypt_buf(struct crypto_sync_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len); +int lrw_decrypt_buf(struct crypto_sync_skcipher *tfm, + u8 dir, u32 devaddr, u32 fcnt, u8 *buf, size_t len); +void lrw_encrypt_key_free(struct crypto_sync_skcipher *tfm); + +#endif