From patchwork Mon Jul 29 13:51:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 13744999 Received: from mailout3.hostsharing.net (mailout3.hostsharing.net [176.9.242.54]) (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 32EA115956E; Mon, 29 Jul 2024 14:23:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=176.9.242.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722262986; cv=none; b=Kf6f8ni3nOB6uhywjNgGv+Q09M/0kzcJwdJ8vQ1qUKZX0jFF58dqQLDWQJFfiOfyZkeWnG3Dibohj3IoMr/8QxzjbXPdTee4tjf1YeiRAYVCXbYU869WnjD07Q6ig5SYd195owK3oll1fKUVpdFAZ+qdgK6rPHKXQRApMFzaIkc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722262986; c=relaxed/simple; bh=yFjhCDW/4/pskMBZWpISnW0wA2I1gRBBaDzVXgwfNUA=; h=Message-ID:In-Reply-To:References:From:Date:Subject:To:Cc; b=PsjIehC6UcU26IhCWl+tQnB2oSgw2whaOkcRbfb4xr1IJDty5kJIzdCDSE7/KphEpr/Z24YXFroVLs9+tha5jEdek4bZWGh7gyHSLHpq22Ut5FbJC5sn1XGS2krark20KvNaUJR/7s6jfrVPMwoyC4qyIbb23YHULmxh6BtmQLw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=wunner.de; spf=pass smtp.mailfrom=wunner.de; arc=none smtp.client-ip=176.9.242.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=wunner.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=wunner.de Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL TLS RSA CA G1" (verified OK)) by mailout3.hostsharing.net (Postfix) with ESMTPS id 7C2BA1005D079; Mon, 29 Jul 2024 16:23:00 +0200 (CEST) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 39F5D638C58F; Mon, 29 Jul 2024 16:23:00 +0200 (CEST) X-Mailbox-Line: From 73f2190e7254181f9ab7e9a3ec64cae56def8435 Mon Sep 17 00:00:00 2001 Message-ID: <73f2190e7254181f9ab7e9a3ec64cae56def8435.1722260176.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Mon, 29 Jul 2024 15:51:00 +0200 Subject: [PATCH 5/5] crypto: ecdsa - Support P1363 signature decoding To: Herbert Xu , "David S. Miller" , Stefan Berger Cc: David Howells , Vitaly Chikunov , Tadeusz Struk , Andrew Zaborowski , Saulo Alessandre , Jonathan Cameron , linux-crypto@vger.kernel.org, keyrings@vger.kernel.org Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Alternatively to the X9.62 encoding of ecdsa signatures, which uses ASN.1 and is already supported by the kernel, there's another common encoding called P1363. It stores r and s as the concatenation of two big endian, unsigned integers. The name originates from IEEE P1363. Add a P1363 template in support of the forthcoming SPDM library (Security Protocol and Data Model) for PCI device authentication. P1363 is prescribed by SPDM 1.2.1 margin no 44: "For ECDSA signatures, excluding SM2, in SPDM, the signature shall be the concatenation of r and s. The size of r shall be the size of the selected curve. Likewise, the size of s shall be the size of the selected curve. See BaseAsymAlgo in NEGOTIATE_ALGORITHMS for the size of r and s. The byte order for r and s shall be in big endian order. When placing ECDSA signatures into an SPDM signature field, r shall come first followed by s." Link: https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.2.1.pdf Signed-off-by: Lukas Wunner Reviewed-by: Jonathan Cameron --- crypto/Makefile | 1 + crypto/asymmetric_keys/public_key.c | 40 ++++--- crypto/ecdsa-p1363.c | 155 ++++++++++++++++++++++++++++ crypto/ecdsa.c | 8 ++ crypto/testmgr.c | 18 ++++ crypto/testmgr.h | 34 ++++++ include/crypto/internal/ecc.h | 1 + 7 files changed, 241 insertions(+), 16 deletions(-) create mode 100644 crypto/ecdsa-p1363.c diff --git a/crypto/Makefile b/crypto/Makefile index eb6479493f6c..f7a7b1a6c93f 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -54,6 +54,7 @@ $(obj)/ecdsasignature.asn1.o: $(obj)/ecdsasignature.asn1.c $(obj)/ecdsasignature $(obj)/ecdsa-x962.o: $(obj)/ecdsasignature.asn1.h ecdsa_generic-y += ecdsa.o ecdsa_generic-y += ecdsa-x962.o +ecdsa_generic-y += ecdsa-p1363.o ecdsa_generic-y += ecdsasignature.asn1.o obj-$(CONFIG_CRYPTO_ECDSA) += ecdsa_generic.o diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 5391f1158bcd..6b004022f655 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -104,7 +104,8 @@ software_key_determine_akcipher(const struct public_key *pkey, return -EINVAL; *sig = false; } else if (strncmp(pkey->pkey_algo, "ecdsa", 5) == 0) { - if (strcmp(encoding, "x962") != 0) + if (strcmp(encoding, "x962") != 0 && + strcmp(encoding, "p1363") != 0) return -EINVAL; /* * ECDSA signatures are taken over a raw hash, so they don't @@ -230,7 +231,6 @@ static int software_key_query(const struct kernel_pkey_params *params, info->key_size = len * 8; if (strncmp(pkey->pkey_algo, "ecdsa", 5) == 0) { - int slen = len; /* * ECDSA key sizes are much smaller than RSA, and thus could * operate on (hashed) inputs that are larger than key size. @@ -242,21 +242,29 @@ static int software_key_query(const struct kernel_pkey_params *params, /* * Verify takes ECDSA-Sig (described in RFC 5480) as input, - * which is actually 2 'key_size'-bit integers encoded in - * ASN.1. Account for the ASN.1 encoding overhead here. - * - * NIST P192/256/384 may prepend a '0' to a coordinate to - * indicate a positive integer. NIST P521 never needs it. + * which is actually 2 'key_size'-bit integers. */ - if (strcmp(pkey->pkey_algo, "ecdsa-nist-p521") != 0) - slen += 1; - /* Length of encoding the x & y coordinates */ - slen = 2 * (slen + 2); - /* - * If coordinate encoding takes at least 128 bytes then an - * additional byte for length encoding is needed. - */ - info->max_sig_size = 1 + (slen >= 128) + 1 + slen; + if (strcmp(params->encoding, "x962") == 0) { + int slen = len; + + /* + * Account for the ASN.1 encoding overhead here. + * + * NIST P192/256/384 may prepend a '0' to a coordinate + * to indicate a positive integer. NIST P521 does not. + */ + if (strcmp(pkey->pkey_algo, "ecdsa-nist-p521") != 0) + slen += 1; + /* Length of encoding the x & y coordinates */ + slen = 2 * (slen + 2); + /* + * If coordinate encoding takes at least 128 bytes then + * an additional byte for length encoding is needed. + */ + info->max_sig_size = 1 + (slen >= 128) + 1 + slen; + } else if (strcmp(params->encoding, "p1363") == 0) { + info->max_sig_size = 2 * len; + } } else { info->max_data_size = len; info->max_sig_size = len; diff --git a/crypto/ecdsa-p1363.c b/crypto/ecdsa-p1363.c new file mode 100644 index 000000000000..c0610d88aa9e --- /dev/null +++ b/crypto/ecdsa-p1363.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ECDSA P1363 signature encoding + * + * Copyright (c) 2024 Intel Corporation + */ + +#include +#include +#include +#include +#include +#include + +struct ecdsa_p1363_ctx { + struct crypto_akcipher *child; +}; + +struct ecdsa_p1363_request { + u64 r[ECC_MAX_DIGITS]; + u64 s[ECC_MAX_DIGITS]; + struct akcipher_request child_req; +}; + +static int ecdsa_p1363_verify(struct akcipher_request *req) +{ + struct ecdsa_p1363_request *req_ctx = akcipher_request_ctx(req); + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct ecdsa_p1363_ctx *ctx = akcipher_tfm_ctx(tfm); + unsigned int keylen = crypto_akcipher_maxsize(ctx->child); + unsigned int ndigits = DIV_ROUND_UP(keylen, sizeof(u64)); + + if (req->sig_len != keylen * 2) + return -EINVAL; + + ecc_digits_from_bytes(req->sig, keylen, req_ctx->r, ndigits); + ecc_digits_from_bytes(req->sig + keylen, keylen, req_ctx->s, ndigits); + + akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); + akcipher_request_set_crypt(&req_ctx->child_req, req_ctx, req->digest, + ECC_MAX_BYTES * 2, req->digest_len); + + return crypto_akcipher_verify(&req_ctx->child_req); +} + +static unsigned int ecdsa_p1363_max_size(struct crypto_akcipher *tfm) +{ + struct ecdsa_p1363_ctx *ctx = akcipher_tfm_ctx(tfm); + + return crypto_akcipher_maxsize(ctx->child); +} + +static int ecdsa_p1363_set_pub_key(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + struct ecdsa_p1363_ctx *ctx = akcipher_tfm_ctx(tfm); + + return crypto_akcipher_set_pub_key(ctx->child, key, keylen); +} + +static int ecdsa_p1363_init_tfm(struct crypto_akcipher *tfm) +{ + struct akcipher_instance *inst = akcipher_alg_instance(tfm); + struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst); + struct ecdsa_p1363_ctx *ctx = akcipher_tfm_ctx(tfm); + struct crypto_akcipher *child_tfm; + + child_tfm = crypto_spawn_akcipher(spawn); + if (IS_ERR(child_tfm)) + return PTR_ERR(child_tfm); + + ctx->child = child_tfm; + + akcipher_set_reqsize(tfm, sizeof(struct ecdsa_p1363_request) + + crypto_akcipher_reqsize(child_tfm)); + + return 0; +} + +static void ecdsa_p1363_exit_tfm(struct crypto_akcipher *tfm) +{ + struct ecdsa_p1363_ctx *ctx = akcipher_tfm_ctx(tfm); + + crypto_free_akcipher(ctx->child); +} + +static void ecdsa_p1363_free(struct akcipher_instance *inst) +{ + struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst); + + crypto_drop_akcipher(spawn); + kfree(inst); +} + +static int ecdsa_p1363_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct crypto_akcipher_spawn *spawn; + struct akcipher_instance *inst; + struct akcipher_alg *ecdsa_alg; + u32 mask; + int err; + + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask); + if (err) + return err; + + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + spawn = akcipher_instance_ctx(inst); + + err = crypto_grab_akcipher(spawn, akcipher_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), 0, mask); + if (err) + goto err_free_inst; + + ecdsa_alg = crypto_spawn_akcipher_alg(spawn); + + err = -EINVAL; + if (strncmp(ecdsa_alg->base.cra_name, "ecdsa", 5) != 0) + goto err_free_inst; + + err = crypto_inst_setname(akcipher_crypto_instance(inst), tmpl->name, + &ecdsa_alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_priority = ecdsa_alg->base.cra_priority; + inst->alg.base.cra_ctxsize = sizeof(struct ecdsa_p1363_ctx); + + inst->alg.init = ecdsa_p1363_init_tfm; + inst->alg.exit = ecdsa_p1363_exit_tfm; + + inst->alg.verify = ecdsa_p1363_verify; + inst->alg.max_size = ecdsa_p1363_max_size; + inst->alg.set_pub_key = ecdsa_p1363_set_pub_key; + + inst->free = ecdsa_p1363_free; + + err = akcipher_register_instance(tmpl, inst); + if (err) { +err_free_inst: + ecdsa_p1363_free(inst); + } + return err; +} + +struct crypto_template ecdsa_p1363_tmpl = { + .name = "p1363", + .create = ecdsa_p1363_create, + .module = THIS_MODULE, +}; + +MODULE_ALIAS_CRYPTO("p1363"); diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c index 86fc64cb1aee..63cffd978ebd 100644 --- a/crypto/ecdsa.c +++ b/crypto/ecdsa.c @@ -291,8 +291,15 @@ static int __init ecdsa_init(void) if (ret) goto x962_tmpl_error; + ret = crypto_register_template(&ecdsa_p1363_tmpl); + if (ret) + goto p1363_tmpl_error; + return 0; +p1363_tmpl_error: + crypto_unregister_template(&ecdsa_x962_tmpl); + x962_tmpl_error: crypto_unregister_akcipher(&ecdsa_nist_p521); @@ -311,6 +318,7 @@ static int __init ecdsa_init(void) static void __exit ecdsa_exit(void) { crypto_unregister_template(&ecdsa_x962_tmpl); + crypto_unregister_template(&ecdsa_p1363_tmpl); if (ecdsa_nist_p192_registered) crypto_unregister_akcipher(&ecdsa_nist_p192); diff --git a/crypto/testmgr.c b/crypto/testmgr.c index 5d3af7c8e723..fab2b453b3e9 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -5427,6 +5427,24 @@ static const struct alg_test_desc alg_test_descs[] = { .suite = { .hash = __VECS(nhpoly1305_tv_template) } + }, { + .alg = "p1363(ecdsa-nist-p192)", + .test = alg_test_null, + }, { + .alg = "p1363(ecdsa-nist-p256)", + .test = alg_test_akcipher, + .fips_allowed = 1, + .suite = { + .akcipher = __VECS(p1363_ecdsa_nist_p256_tv_template) + } + }, { + .alg = "p1363(ecdsa-nist-p384)", + .test = alg_test_null, + .fips_allowed = 1, + }, { + .alg = "p1363(ecdsa-nist-p521)", + .test = alg_test_null, + .fips_allowed = 1, }, { .alg = "pcbc(fcrypt)", .test = alg_test_skcipher, diff --git a/crypto/testmgr.h b/crypto/testmgr.h index d052d18c8f5b..cdd33dc19396 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -2024,6 +2024,40 @@ static const struct akcipher_testvec x962_ecdsa_nist_p521_tv_template[] = { }, }; +/* + * ECDSA P1363 test vectors. + * + * Identical to ECDSA test vectors, except signature in "c" is P1363 encoded. + */ +static const struct akcipher_testvec p1363_ecdsa_nist_p256_tv_template[] = { + { + .key = + "\x04\xf1\xea\xc4\x53\xf3\xb9\x0e\x9f\x7e\xad\xe3\xea\xd7\x0e\x0f" + "\xd6\x98\x9a\xca\x92\x4d\x0a\x80\xdb\x2d\x45\xc7\xec\x4b\x97\x00" + "\x2f\xe9\x42\x6c\x29\xdc\x55\x0e\x0b\x53\x12\x9b\x2b\xad\x2c\xe9" + "\x80\xe6\xc5\x43\xc2\x1d\x5e\xbb\x65\x21\x50\xb6\x37\xb0\x03\x8e" + "\xb8", + .key_len = 65, + .params = + "\x30\x13\x06\x07\x2a\x86\x48\xce\x3d\x02\x01\x06\x08\x2a\x86\x48" + "\xce\x3d\x03\x01\x07", + .param_len = 21, + .m = + "\x8f\x43\x43\x46\x64\x8f\x6b\x96\xdf\x89\xdd\xa9\x01\xc5\x17\x6b" + "\x10\xa6\xd8\x39\x61\xdd\x3c\x1a\xc8\x8b\x59\xb2\xdc\x32\x7a\xa4", + .m_size = 32, + .algo = OID_id_ecdsa_with_sha256, + .c = + "\x08\x31\xfa\x74\x0d\x1d\x21\x5d\x09\xdc\x29\x63\xa8\x1a\xad\xfc" + "\xac\x44\xc3\xe8\x24\x11\x2d\xa4\x91\xdc\x02\x67\xdc\x0c\xd0\x82" + "\xbd\xff\xce\xee\x42\xc3\x97\xff\xf9\xa9\x81\xac\x4a\x50\xd0\x91" + "\x0a\x6e\x1b\xc4\xaf\xe1\x83\xc3\x4f\x2a\x65\x35\x23\xe3\x1d\xfa", + .c_size = 64, + .public_key_vec = true, + .siggen_sigver_test = true, + }, +}; + /* * EC-RDSA test vectors are generated by gost-engine. */ diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h index 568b7c5352b9..af0763d859ce 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -294,4 +294,5 @@ void ecc_point_mult_shamir(const struct ecc_point *result, const struct ecc_curve *curve); extern struct crypto_template ecdsa_x962_tmpl; +extern struct crypto_template ecdsa_p1363_tmpl; #endif