From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3DF8C433F5 for ; Thu, 3 Mar 2022 14:04:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232832AbiCCOFU (ORCPT ); Thu, 3 Mar 2022 09:05:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232127AbiCCOFT (ORCPT ); Thu, 3 Mar 2022 09:05:19 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C8B9424BE; Thu, 3 Mar 2022 06:04:33 -0800 (PST) Received: from fraeml706-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K8Xks1mSMz67Zts; Thu, 3 Mar 2022 22:03:17 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml706-chm.china.huawei.com (10.206.15.55) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.21; Thu, 3 Mar 2022 15:04:31 +0100 Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.21; Thu, 3 Mar 2022 14:04:31 +0000 From: Jonathan Cameron To: , CC: , Lorenzo Pieralisi , Chris Browy , , "Bjorn Helgaas" , "David E . Box" , Subject: [RFC PATCH v2 11/14] lib/asn1_encoder: Add a function to encode many byte integer values. Date: Thu, 3 Mar 2022 13:59:02 +0000 Message-ID: <20220303135905.10420-12-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220303135905.10420-1-Jonathan.Cameron@huawei.com> References: <20220303135905.10420-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhreml706-chm.china.huawei.com (10.201.108.55) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org An example is the encoding of ECC signatures used by the ECDSA signature verification code. A user is the new SPDM support where raw signatures are returned by the responder. These can then be encoded so that we can pass them to signature_verify() Signed-off-by: Jonathan Cameron --- include/linux/asn1_encoder.h | 3 ++ lib/asn1_encoder.c | 54 ++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/include/linux/asn1_encoder.h b/include/linux/asn1_encoder.h index 08cd0c2ad34f..30c3ebacd46c 100644 --- a/include/linux/asn1_encoder.h +++ b/include/linux/asn1_encoder.h @@ -19,6 +19,9 @@ unsigned char * asn1_encode_tag(unsigned char *data, const unsigned char *end_data, u32 tag, const unsigned char *string, int len); unsigned char * +asn1_encode_integer_large_positive(unsigned char *data, const unsigned char *end_data, + u32 tag, const unsigned char *integer, int len); +unsigned char * asn1_encode_octet_string(unsigned char *data, const unsigned char *end_data, const unsigned char *string, u32 len); diff --git a/lib/asn1_encoder.c b/lib/asn1_encoder.c index 0fd3c454a468..3aaffe6a376d 100644 --- a/lib/asn1_encoder.c +++ b/lib/asn1_encoder.c @@ -315,6 +315,60 @@ asn1_encode_tag(unsigned char *data, const unsigned char *end_data, } EXPORT_SYMBOL_GPL(asn1_encode_tag); +unsigned char * +asn1_encode_integer_large_positive(unsigned char *data, const unsigned char *end_data, + u32 tag, const unsigned char *integer, int len) +{ + int data_len = end_data - data; + unsigned char *d = &data[2]; + bool found = false; + int i; + + if (WARN(tag > 30, "ASN.1 tag can't be > 30")) + return ERR_PTR(-EINVAL); + + if (!integer && WARN(len > 127, + "BUG: recode tag is too big (>127)")) + return ERR_PTR(-EINVAL); + + if (IS_ERR(data)) + return data; + + if (data_len < 3) + return ERR_PTR(-EINVAL); + + + data[0] = _tagn(UNIV, PRIM, tag); + /* Leave space for length */ + data_len -= 2; + + for (i = 0; i < len; i++) { + int byte = integer[i]; + + if (!found && byte == 0) + continue; + + /* + * as per encode_integer + */ + if (!found && (byte & 0x80)) { + *d++ = 0; + data_len--; + } + found = true; + if (data_len == 0) + return ERR_PTR(-EINVAL); + + *d++ = byte; + data_len--; + } + + data[1] = d - data - 2; + + return d; +} +EXPORT_SYMBOL_GPL(asn1_encode_integer_large_positive); + /** * asn1_encode_octet_string() - encode an ASN.1 OCTET STRING * @data: pointer to encode at -- 2.32.0