From patchwork Mon Jun 15 20:18:47 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tadeusz Struk X-Patchwork-Id: 6612211 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Original-To: patchwork-linux-crypto@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A79B7C0020 for ; Mon, 15 Jun 2015 20:19:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4EA582054A for ; Mon, 15 Jun 2015 20:19:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A1BC720768 for ; Mon, 15 Jun 2015 20:19:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756116AbbFOUTC (ORCPT ); Mon, 15 Jun 2015 16:19:02 -0400 Received: from mga01.intel.com ([192.55.52.88]:5175 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756079AbbFOUSv (ORCPT ); Mon, 15 Jun 2015 16:18:51 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP; 15 Jun 2015 13:18:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,620,1427785200"; d="scan'208";a="711458594" Received: from tstruk-mobl1.jf.intel.com (HELO [127.0.1.1]) ([134.134.171.82]) by orsmga001.jf.intel.com with ESMTP; 15 Jun 2015 13:18:50 -0700 Subject: [PATCH RFC v5 3/4] crypto: rsa: add a new rsa generic implementation From: Tadeusz Struk To: herbert@gondor.apana.org.au Cc: linux-kernel@vger.kernel.org, keescook@chromium.org, jwboyer@redhat.com, smueller@chronox.de, richard@nod.at, tadeusz.struk@intel.com, steved@redhat.com, qat-linux@intel.com, dhowells@redhat.com, linux-crypto@vger.kernel.org, james.l.morris@oracle.com, jkosina@suse.cz, zohar@linux.vnet.ibm.com, davem@davemloft.net, vgoyal@redhat.com Date: Mon, 15 Jun 2015 13:18:47 -0700 Message-ID: <20150615201847.15697.55852.stgit@tstruk-mobl1> In-Reply-To: <20150615201831.15697.57738.stgit@tstruk-mobl1> References: <20150615201831.15697.57738.stgit@tstruk-mobl1> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a new rsa generic SW implementation. This implements only cryptographic primitives. Signed-off-by: Tadeusz Struk --- crypto/Kconfig | 7 + crypto/Makefile | 8 + crypto/rsa.c | 295 +++++++++++++++++++++++++++++++++++++++++ crypto/rsa_helper.c | 134 +++++++++++++++++++ crypto/rsakey.asn1 | 5 + include/crypto/internal/rsa.h | 30 ++++ 6 files changed, 479 insertions(+) create mode 100644 crypto/rsa.c create mode 100644 crypto/rsa_helper.c create mode 100644 crypto/rsakey.asn1 create mode 100644 include/crypto/internal/rsa.h -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/crypto/Kconfig b/crypto/Kconfig index ed413d9..a09404b 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -97,6 +97,13 @@ config CRYPTO_AKCIPHER help Crypto API interface for public key algorithms. +config CRYPTO_RSA + tristate "RSA algorithm" + select AKCIPHER + select MPILIB + help + Generic implementation of the RSA public key algorithm. + config CRYPTO_MANAGER tristate "Cryptographic algorithm manager" select CRYPTO_MANAGER2 diff --git a/crypto/Makefile b/crypto/Makefile index 6f2940a..c6217ea 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -30,6 +30,14 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o obj-$(CONFIG_CRYPTO_AKCIPHER) += akcipher.o +$(obj)/rsakey-asn1.o: $(obj)/rsakey-asn1.c $(obj)/rsakey-asn1.h +clean-files += rsakey-asn1.c rsakey-asn1.h + +rsa_generic-y := rsakey-asn1.o +rsa_generic-y += rsa.o +rsa_generic-y += rsa_helper.o +obj-$(CONFIG_CRYPTO_RSA) += rsa_generic.o + cryptomgr-y := algboss.o testmgr.o obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o diff --git a/crypto/rsa.c b/crypto/rsa.c new file mode 100644 index 0000000..176f565 --- /dev/null +++ b/crypto/rsa.c @@ -0,0 +1,295 @@ +/* RSA asymmetric public-key algorithm [RFC3447] + * + * Copyright (c) 2015, Intel Corporation + * Authors: Tadeusz Struk + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#include +#include +#include + +/* + * RSAEP function [RFC3447 sec 5.1.1] + * c = m^e mod n; + */ +static int _rsa_enc(const struct rsa_key *key, MPI c, MPI m) +{ + /* (1) Validate 0 <= m < n */ + if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0) + return -EINVAL; + + /* (2) c = m^e mod n */ + return mpi_powm(c, m, key->e, key->n); +} + +/* + * RSADP function [RFC3447 sec 5.1.2] + * m = c^d mod n; + */ +static int _rsa_dec(const struct rsa_key *key, MPI m, MPI c) +{ + /* (1) Validate 0 <= c < n */ + if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0) + return -EINVAL; + + /* (2) m = c^d mod n */ + return mpi_powm(m, c, key->d, key->n); +} + +/* + * RSASP1 function [RFC3447 sec 5.2.1] + * s = m^d mod n + */ +static int _rsa_sign(const struct rsa_key *key, MPI s, MPI m) +{ + /* (1) Validate 0 <= m < n */ + if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0) + return -EINVAL; + + /* (2) s = m^d mod n */ + return mpi_powm(s, m, key->d, key->n); +} + +/* + * RSAVP1 function [RFC3447 sec 5.2.2] + * m = s^e mod n; + */ +static int _rsa_verify(const struct rsa_key *key, MPI m, MPI s) +{ + /* (1) Validate 0 <= s < n */ + if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0) + return -EINVAL; + + /* (2) m = s^e mod n */ + return mpi_powm(m, s, key->e, key->n); +} + +static int rsa_enc(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = akcipher_request_get_tfm(req); + const struct rsa_key *pkey = rsa_get_key(tfm); + MPI m, c = mpi_alloc(0); + unsigned int len; + int ret = 0; + int sign; + + if (!c) + return -ENOMEM; + + if (!pkey->n || !pkey->e || req->dst_len < mpi_get_size(pkey->n)) + return -EINVAL; + + m = mpi_read_raw_data(req->src, req->src_len); + if (!m) { + ret = -ENOMEM; + goto err_free_c; + } + + ret = _rsa_enc(pkey, c, m); + if (ret) + goto err_free_m; + + ret = mpi_read_buffer(c, req->dst, req->dst_len, &len, &sign); + if (ret) + goto err_free_m; + + if (sign < 0) { + ret = -EBADMSG; + goto err_free_m; + } + + if (req->result_len) + *req->result_len = len; + +err_free_m: + mpi_free(m); +err_free_c: + mpi_free(c); + return ret; +} + +static int rsa_dec(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = akcipher_request_get_tfm(req); + const struct rsa_key *pkey = rsa_get_key(tfm); + MPI c, m = mpi_alloc(0); + unsigned int len; + int ret = 0; + int sign; + + if (!m) + return -ENOMEM; + + if (!pkey->n || !pkey->d || req->dst_len < mpi_get_size(pkey->n)) + return -EINVAL; + + c = mpi_read_raw_data(req->src, req->src_len); + if (!c) { + ret = -ENOMEM; + goto err_free_m; + } + + ret = _rsa_dec(pkey, m, c); + if (ret) + goto err_free_c; + + ret = mpi_read_buffer(m, req->dst, req->dst_len, &len, &sign); + if (ret) + goto err_free_c; + + if (sign < 0) { + ret = -EBADMSG; + goto err_free_c; + } + + if (req->result_len) + *req->result_len = len; + +err_free_c: + mpi_free(c); +err_free_m: + mpi_free(m); + return ret; +} + +static int rsa_sign(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = akcipher_request_get_tfm(req); + const struct rsa_key *pkey = rsa_get_key(tfm); + MPI m, s = mpi_alloc(0); + unsigned int len; + int ret = 0; + int sign; + + if (!s) + return -ENOMEM; + + if (!pkey->n || !pkey->d || req->dst_len < mpi_get_size(pkey->n)) + return -EINVAL; + + m = mpi_read_raw_data(req->src, req->src_len); + if (!m) { + ret = -ENOMEM; + goto err_free_s; + } + + ret = _rsa_sign(pkey, s, m); + if (ret) + goto err_free_m; + + ret = mpi_read_buffer(s, req->dst, req->dst_len, &len, &sign); + if (ret) + goto err_free_m; + + if (sign < 0) { + ret = -EBADMSG; + goto err_free_m; + } + + if (req->result_len) + *req->result_len = len; + +err_free_m: + mpi_free(m); +err_free_s: + mpi_free(s); + return ret; +} + +static int rsa_verify(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = akcipher_request_get_tfm(req); + const struct rsa_key *pkey = rsa_get_key(tfm); + MPI s, m = mpi_alloc(0); + unsigned int len; + int ret = 0; + int sign; + + if (!m) + return -ENOMEM; + + if (!pkey->n || !pkey->e || req->dst_len < mpi_get_size(pkey->n)) + return -EINVAL; + + s = mpi_read_raw_data(req->src, req->src_len); + if (!s) { + ret = -ENOMEM; + goto err_free_m; + } + + ret = _rsa_verify(pkey, m, s); + if (ret) + goto err_free_s; + + ret = mpi_read_buffer(m, req->dst, req->dst_len, &len, &sign); + if (ret) + goto err_free_s; + + if (sign < 0) { + ret = -EBADMSG; + goto err_free_s; + } + + if (req->result_len) + *req->result_len = len; + +err_free_s: + mpi_free(s); +err_free_m: + mpi_free(m); + return ret; +} + +static int rsa_maxsize(struct crypto_akcipher *tfm) +{ + const struct rsa_key *pkey = rsa_get_key(tfm); + + if (pkey && pkey->n) + return mpi_get_size(pkey->n); + + return -EINVAL; +} + +static int rsa_setkey(struct crypto_akcipher *tfm, const void *key, + unsigned int keylen) +{ + return rsa_parse_key(tfm, key, keylen); +} + +static struct akcipher_alg rsa = { + .encrypt = rsa_enc, + .decrypt = rsa_dec, + .sign = rsa_sign, + .verify = rsa_verify, + .maxsize = rsa_maxsize, + .setkey = rsa_setkey, + .base = { + .cra_name = "rsa", + .cra_driver_name = "rsa-generic", + .cra_priority = 100, + .cra_ctxsize = 0, + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + }, +}; + +static int rsa_init(void) +{ + return crypto_register_akcipher(&rsa); +} + +static void rsa_exit(void) +{ + crypto_unregister_akcipher(&rsa); +} + +module_init(rsa_init); +module_exit(rsa_exit); +MODULE_ALIAS_CRYPTO("rsa"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("RSA generic algorithm"); diff --git a/crypto/rsa_helper.c b/crypto/rsa_helper.c new file mode 100644 index 0000000..6569b02 --- /dev/null +++ b/crypto/rsa_helper.c @@ -0,0 +1,134 @@ +/* + * RSA key extract helper + * + * Copyright (c) 2015, Intel Corporation + * Authors: Tadeusz Struk + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ +#include +#include +#include "rsakey-asn1.h" + +int rsa_get_n(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct crypto_akcipher *tfm = context; + struct rsa_key *key = tfm->key; + + key->n = mpi_read_raw_data(value, vlen); + + if (!key->n) + return -ENOMEM; + + /* In FIPS mode only allow key size minimum 2K */ + if (fips_enabled && (mpi_get_size(key->n) < 256)) { + pr_err("RSA: key size not allowed in FIPS mode\n"); + mpi_free(key->n); + key->n = NULL; + return -EINVAL; + } + + return 0; +} + +int rsa_get_e(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct crypto_akcipher *tfm = context; + struct rsa_key *key = tfm->key; + + key->e = mpi_read_raw_data(value, vlen); + + if (!key->e) + return -ENOMEM; + + return 0; +} + +int rsa_get_d(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct crypto_akcipher *tfm = context; + struct rsa_key *key = tfm->key; + + key->d = mpi_read_raw_data(value, vlen); + + if (!key->d) + return -ENOMEM; + + /* In FIPS mode only allow key size minimum 2K */ + if (fips_enabled && (mpi_get_size(key->d) < 256)) { + pr_err("RSA: key size not allowed in FIPS mode\n"); + mpi_free(key->d); + key->d = NULL; + return -EINVAL; + } + return 0; +} + +static void free_mpis(struct rsa_key *key) +{ + if (key->n) + mpi_free(key->n); + + if (key->e) + mpi_free(key->e); + + if (key->d) + mpi_free(key->d); + + key->n = NULL; + key->e = NULL; + key->d = NULL; +} + +static void rsa_free_key(struct crypto_tfm *tfm_base) +{ + struct crypto_akcipher *tfm = __crypto_akcipher_tfm(tfm_base); + struct crypto_alg *alg = tfm_base->__crt_alg; + + if (alg->cra_exit) + alg->cra_exit(tfm_base); + + free_mpis(tfm->key); + kfree(tfm->key); + tfm->key = NULL; +} + +/** + * rsa_parse_key() - extracts an rsa key from BER encoded buffer + * and stores it in tfm + * + * @tfm: akcipher handler + * @key: key in BER format + * @key_len: length of key + * + * Return: 0 on success or error code in case of error + */ +int rsa_parse_key(struct crypto_akcipher *tfm, const void *key, + unsigned int key_len) +{ + int ret; + + if (!tfm->key) { + tfm->key = kzalloc(sizeof(struct rsa_key), GFP_KERNEL); + tfm->base.exit = rsa_free_key; + } else { + free_mpis(tfm->key); + } + + ret = asn1_ber_decoder(&rsakey_decoder, tfm, key, key_len); + if (ret < 0) + goto error; + + return 0; +error: + free_mpis(tfm->key); + return ret; +} +EXPORT_SYMBOL_GPL(rsa_parse_key); diff --git a/crypto/rsakey.asn1 b/crypto/rsakey.asn1 new file mode 100644 index 0000000..3c7b5df --- /dev/null +++ b/crypto/rsakey.asn1 @@ -0,0 +1,5 @@ +RsaKey ::= SEQUENCE { + n INTEGER ({ rsa_get_n }), + e INTEGER ({ rsa_get_e }), + d INTEGER ({ rsa_get_d }) +} diff --git a/include/crypto/internal/rsa.h b/include/crypto/internal/rsa.h new file mode 100644 index 0000000..475d52b --- /dev/null +++ b/include/crypto/internal/rsa.h @@ -0,0 +1,30 @@ +/* + * RSA internal helpers + * + * Copyright (c) 2015, Intel Corporation + * Authors: Tadeusz Struk + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ +#ifndef _RSA_HELPER_ +#define _RSA_HELPER_ +#include +#include + +struct rsa_key { + MPI n; + MPI e; + MPI d; +}; + +int rsa_parse_key(struct crypto_akcipher *tfm, const void *key, + unsigned int key_len); +static inline struct rsa_key *rsa_get_key(struct crypto_akcipher *tfm) +{ + return tfm->key; +} +#endif