crypto: ecdh - Add ECDH software support
* Implement ECDH under kpp API * Provide ECC software support for curve P-192 and P-256. * Add kpp test for ECDH with data generated by OpenSSL Signed-off-by: Salvatore Benedetto <salvatore.benedetto@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Salvatore Benedetto
Herbert Xu
parent
802c7f1c84
commit
3c4b23901a
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@ -118,6 +118,11 @@ config CRYPTO_DH
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help
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Generic implementation of the Diffie-Hellman algorithm.
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config CRYPTO_ECDH
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tristate "ECDH algorithm"
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select CRYTPO_KPP
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help
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Generic implementation of the ECDH algorithm
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config CRYPTO_MANAGER
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tristate "Cryptographic algorithm manager"
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@ -35,6 +35,10 @@ obj-$(CONFIG_CRYPTO_KPP2) += kpp.o
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dh_generic-y := dh.o
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dh_generic-y += dh_helper.o
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obj-$(CONFIG_CRYPTO_DH) += dh_generic.o
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ecdh_generic-y := ecc.o
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ecdh_generic-y += ecdh.o
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ecdh_generic-y += ecdh_helper.o
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obj-$(CONFIG_CRYPTO_ECDH) += ecdh_generic.o
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$(obj)/rsapubkey-asn1.o: $(obj)/rsapubkey-asn1.c $(obj)/rsapubkey-asn1.h
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$(obj)/rsaprivkey-asn1.o: $(obj)/rsaprivkey-asn1.c $(obj)/rsaprivkey-asn1.h
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,83 @@
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/*
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* Copyright (c) 2013, Kenneth MacKay
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _CRYPTO_ECC_H
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#define _CRYPTO_ECC_H
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#define ECC_MAX_DIGITS 4 /* 256 */
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#define ECC_DIGITS_TO_BYTES_SHIFT 3
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/**
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* ecc_is_key_valid() - Validate a given ECDH private key
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*
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* @curve_id: id representing the curve to use
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* @ndigits: curve number of digits
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* @private_key: private key to be used for the given curve
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* @private_key_len: private key len
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*
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* Returns 0 if the key is acceptable, a negative value otherwise
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*/
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int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
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const u8 *private_key, unsigned int private_key_len);
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/**
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* ecdh_make_pub_key() - Compute an ECC public key
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*
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* @curve_id: id representing the curve to use
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* @private_key: pregenerated private key for the given curve
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* @private_key_len: length of private_key
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* @public_key: buffer for storing the public key generated
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* @public_key_len: length of the public_key buffer
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*
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* Returns 0 if the public key was generated successfully, a negative value
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* if an error occurred.
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*/
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int ecdh_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
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const u8 *private_key, unsigned int private_key_len,
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u8 *public_key, unsigned int public_key_len);
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/**
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* ecdh_shared_secret() - Compute a shared secret
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*
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* @curve_id: id representing the curve to use
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* @private_key: private key of part A
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* @private_key_len: length of private_key
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* @public_key: public key of counterpart B
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* @public_key_len: length of public_key
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* @secret: buffer for storing the calculated shared secret
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* @secret_len: length of the secret buffer
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*
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* Note: It is recommended that you hash the result of ecdh_shared_secret
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* before using it for symmetric encryption or HMAC.
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*
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* Returns 0 if the shared secret was generated successfully, a negative value
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* if an error occurred.
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*/
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int ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
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const u8 *private_key, unsigned int private_key_len,
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const u8 *public_key, unsigned int public_key_len,
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u8 *secret, unsigned int secret_len);
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#endif
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@ -0,0 +1,57 @@
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#ifndef _CRYTO_ECC_CURVE_DEFS_H
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#define _CRYTO_ECC_CURVE_DEFS_H
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struct ecc_point {
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u64 *x;
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u64 *y;
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u8 ndigits;
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};
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struct ecc_curve {
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char *name;
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struct ecc_point g;
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u64 *p;
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u64 *n;
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};
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/* NIST P-192 */
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static u64 nist_p192_g_x[] = { 0xF4FF0AFD82FF1012ull, 0x7CBF20EB43A18800ull,
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0x188DA80EB03090F6ull };
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static u64 nist_p192_g_y[] = { 0x73F977A11E794811ull, 0x631011ED6B24CDD5ull,
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0x07192B95FFC8DA78ull };
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static u64 nist_p192_p[] = { 0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFFFFFFFFFEull,
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0xFFFFFFFFFFFFFFFFull };
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static u64 nist_p192_n[] = { 0x146BC9B1B4D22831ull, 0xFFFFFFFF99DEF836ull,
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0xFFFFFFFFFFFFFFFFull };
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static struct ecc_curve nist_p192 = {
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.name = "nist_192",
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.g = {
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.x = nist_p192_g_x,
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.y = nist_p192_g_y,
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.ndigits = 3,
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},
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.p = nist_p192_p,
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.n = nist_p192_n
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};
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/* NIST P-256 */
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static u64 nist_p256_g_x[] = { 0xF4A13945D898C296ull, 0x77037D812DEB33A0ull,
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0xF8BCE6E563A440F2ull, 0x6B17D1F2E12C4247ull };
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static u64 nist_p256_g_y[] = { 0xCBB6406837BF51F5ull, 0x2BCE33576B315ECEull,
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0x8EE7EB4A7C0F9E16ull, 0x4FE342E2FE1A7F9Bull };
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static u64 nist_p256_p[] = { 0xFFFFFFFFFFFFFFFFull, 0x00000000FFFFFFFFull,
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0x0000000000000000ull, 0xFFFFFFFF00000001ull };
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static u64 nist_p256_n[] = { 0xF3B9CAC2FC632551ull, 0xBCE6FAADA7179E84ull,
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0xFFFFFFFFFFFFFFFFull, 0xFFFFFFFF00000000ull };
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static struct ecc_curve nist_p256 = {
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.name = "nist_256",
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.g = {
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.x = nist_p256_g_x,
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.y = nist_p256_g_y,
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.ndigits = 4,
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},
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.p = nist_p256_p,
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.n = nist_p256_n
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};
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#endif
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@ -0,0 +1,151 @@
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/* ECDH key-agreement protocol
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*
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* Copyright (c) 2016, Intel Corporation
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* Authors: Salvator Benedetto <salvatore.benedetto@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <crypto/internal/kpp.h>
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#include <crypto/kpp.h>
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#include <crypto/ecdh.h>
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#include <linux/scatterlist.h>
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#include "ecc.h"
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struct ecdh_ctx {
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unsigned int curve_id;
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unsigned int ndigits;
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u64 private_key[ECC_MAX_DIGITS];
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u64 public_key[2 * ECC_MAX_DIGITS];
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u64 shared_secret[ECC_MAX_DIGITS];
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};
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static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm)
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{
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return kpp_tfm_ctx(tfm);
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}
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static unsigned int ecdh_supported_curve(unsigned int curve_id)
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{
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switch (curve_id) {
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case ECC_CURVE_NIST_P192: return 3;
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case ECC_CURVE_NIST_P256: return 4;
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default: return 0;
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}
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}
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static int ecdh_set_secret(struct crypto_kpp *tfm, void *buf, unsigned int len)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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struct ecdh params;
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unsigned int ndigits;
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if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0)
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return -EINVAL;
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ndigits = ecdh_supported_curve(params.curve_id);
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if (!ndigits)
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return -EINVAL;
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ctx->curve_id = params.curve_id;
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ctx->ndigits = ndigits;
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if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits,
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(const u8 *)params.key, params.key_size) < 0)
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return -EINVAL;
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memcpy(ctx->private_key, params.key, params.key_size);
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return 0;
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}
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static int ecdh_compute_value(struct kpp_request *req)
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{
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int ret = 0;
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struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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size_t copied, nbytes;
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void *buf;
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nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
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if (req->src) {
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copied = sg_copy_to_buffer(req->src, 1, ctx->public_key,
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2 * nbytes);
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if (copied != 2 * nbytes)
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return -EINVAL;
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ret = ecdh_shared_secret(ctx->curve_id, ctx->ndigits,
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(const u8 *)ctx->private_key, nbytes,
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(const u8 *)ctx->public_key, 2 * nbytes,
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(u8 *)ctx->shared_secret, nbytes);
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buf = ctx->shared_secret;
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} else {
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ret = ecdh_make_pub_key(ctx->curve_id, ctx->ndigits,
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(const u8 *)ctx->private_key, nbytes,
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(u8 *)ctx->public_key,
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sizeof(ctx->public_key));
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buf = ctx->public_key;
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/* Public part is a point thus it has both coordinates */
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nbytes *= 2;
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}
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if (ret < 0)
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return ret;
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copied = sg_copy_from_buffer(req->dst, 1, buf, nbytes);
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if (copied != nbytes)
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return -EINVAL;
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return ret;
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}
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static int ecdh_max_size(struct crypto_kpp *tfm)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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int nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
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/* Public key is made of two coordinates */
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return 2 * nbytes;
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}
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static void no_exit_tfm(struct crypto_kpp *tfm)
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{
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return;
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}
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static struct kpp_alg ecdh = {
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.set_secret = ecdh_set_secret,
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.generate_public_key = ecdh_compute_value,
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.compute_shared_secret = ecdh_compute_value,
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.max_size = ecdh_max_size,
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.exit = no_exit_tfm,
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.base = {
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.cra_name = "ecdh",
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.cra_driver_name = "ecdh-generic",
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.cra_priority = 100,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = sizeof(struct ecdh_ctx),
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},
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};
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static int ecdh_init(void)
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{
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return crypto_register_kpp(&ecdh);
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}
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static void ecdh_exit(void)
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{
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crypto_unregister_kpp(&ecdh);
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}
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module_init(ecdh_init);
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module_exit(ecdh_exit);
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MODULE_ALIAS_CRYPTO("ecdh");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ECDH generic algorithm");
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@ -0,0 +1,86 @@
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/*
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* Copyright (c) 2016, Intel Corporation
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* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <crypto/ecdh.h>
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#include <crypto/kpp.h>
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#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
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static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
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{
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memcpy(dst, src, sz);
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return dst + sz;
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}
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static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
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{
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memcpy(dst, src, sz);
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return src + sz;
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}
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int crypto_ecdh_key_len(const struct ecdh *params)
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{
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return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
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int crypto_ecdh_encode_key(char *buf, unsigned int len,
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const struct ecdh *params)
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{
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u8 *ptr = buf;
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struct kpp_secret secret = {
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.type = CRYPTO_KPP_SECRET_TYPE_ECDH,
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.len = len
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};
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if (unlikely(!buf))
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return -EINVAL;
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if (len != crypto_ecdh_key_len(params))
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return -EINVAL;
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ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
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ptr = ecdh_pack_data(ptr, ¶ms->curve_id, sizeof(params->curve_id));
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ptr = ecdh_pack_data(ptr, ¶ms->key_size, sizeof(params->key_size));
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ecdh_pack_data(ptr, params->key, params->key_size);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
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int crypto_ecdh_decode_key(const char *buf, unsigned int len,
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struct ecdh *params)
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{
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const u8 *ptr = buf;
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struct kpp_secret secret;
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if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
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return -EINVAL;
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ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
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if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
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return -EINVAL;
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ptr = ecdh_unpack_data(¶ms->curve_id, ptr, sizeof(params->curve_id));
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ptr = ecdh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size));
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if (secret.len != crypto_ecdh_key_len(params))
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return -EINVAL;
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/* Don't allocate memory. Set pointer to data
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* within the given buffer
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*/
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params->key = (void *)ptr;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);
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@ -3300,6 +3300,16 @@ static const struct alg_test_desc alg_test_descs[] = {
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}
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}
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}
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}, {
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.alg = "ecdh",
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.test = alg_test_kpp,
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.fips_allowed = 1,
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.suite = {
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.kpp = {
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.vecs = ecdh_tv_template,
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.count = ECDH_TEST_VECTORS
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}
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}
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}, {
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.alg = "gcm(aes)",
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.test = alg_test_aead,
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@ -560,6 +560,99 @@ struct kpp_testvec dh_tv_template[] = {
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}
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};
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#ifdef CONFIG_CRYPTO_FIPS
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#define ECDH_TEST_VECTORS 1
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#else
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#define ECDH_TEST_VECTORS 2
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#endif
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struct kpp_testvec ecdh_tv_template[] = {
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{
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#ifndef CONFIG_CRYPTO_FIPS
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.secret =
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#ifdef __LITTLE_ENDIAN
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"\x02\x00" /* type */
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"\x20\x00" /* len */
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"\x01\x00" /* curve_id */
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"\x18\x00" /* key_size */
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#else
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"\x00\x02" /* type */
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"\x00\x20" /* len */
|
||||
"\x00\x01" /* curve_id */
|
||||
"\x00\x18" /* key_size */
|
||||
#endif
|
||||
"\xb5\x05\xb1\x71\x1e\xbf\x8c\xda"
|
||||
"\x4e\x19\x1e\x62\x1f\x23\x23\x31"
|
||||
"\x36\x1e\xd3\x84\x2f\xcc\x21\x72",
|
||||
.b_public =
|
||||
"\xc3\xba\x67\x4b\x71\xec\xd0\x76"
|
||||
"\x7a\x99\x75\x64\x36\x13\x9a\x94"
|
||||
"\x5d\x8b\xdc\x60\x90\x91\xfd\x3f"
|
||||
"\xb0\x1f\x8a\x0a\x68\xc6\x88\x6e"
|
||||
"\x83\x87\xdd\x67\x09\xf8\x8d\x96"
|
||||
"\x07\xd6\xbd\x1c\xe6\x8d\x9d\x67",
|
||||
.expected_a_public =
|
||||
"\x1a\x04\xdb\xa5\xe1\xdd\x4e\x79"
|
||||
"\xa3\xe6\xef\x0e\x5c\x80\x49\x85"
|
||||
"\xfa\x78\xb4\xef\x49\xbd\x4c\x7c"
|
||||
"\x22\x90\x21\x02\xf9\x1b\x81\x5d"
|
||||
"\x0c\x8a\xa8\x98\xd6\x27\x69\x88"
|
||||
"\x5e\xbc\x94\xd8\x15\x9e\x21\xce",
|
||||
.expected_ss =
|
||||
"\xf4\x57\xcc\x4f\x1f\x4e\x31\xcc"
|
||||
"\xe3\x40\x60\xc8\x06\x93\xc6\x2e"
|
||||
"\x99\x80\x81\x28\xaf\xc5\x51\x74",
|
||||
.secret_size = 32,
|
||||
.b_public_size = 48,
|
||||
.expected_a_public_size = 48,
|
||||
.expected_ss_size = 24
|
||||
}, {
|
||||
#endif
|
||||
.secret =
|
||||
#ifdef __LITTLE_ENDIAN
|
||||
"\x02\x00" /* type */
|
||||
"\x28\x00" /* len */
|
||||
"\x02\x00" /* curve_id */
|
||||
"\x20\x00" /* key_size */
|
||||
#else
|
||||
"\x00\x02" /* type */
|
||||
"\x00\x28" /* len */
|
||||
"\x00\x02" /* curve_id */
|
||||
"\x00\x20" /* key_size */
|
||||
#endif
|
||||
"\x24\xd1\x21\xeb\xe5\xcf\x2d\x83"
|
||||
"\xf6\x62\x1b\x6e\x43\x84\x3a\xa3"
|
||||
"\x8b\xe0\x86\xc3\x20\x19\xda\x92"
|
||||
"\x50\x53\x03\xe1\xc0\xea\xb8\x82",
|
||||
.expected_a_public =
|
||||
"\x1a\x7f\xeb\x52\x00\xbd\x3c\x31"
|
||||
"\x7d\xb6\x70\xc1\x86\xa6\xc7\xc4"
|
||||
"\x3b\xc5\x5f\x6c\x6f\x58\x3c\xf5"
|
||||
"\xb6\x63\x82\x77\x33\x24\xa1\x5f"
|
||||
"\x6a\xca\x43\x6f\xf7\x7e\xff\x02"
|
||||
"\x37\x08\xcc\x40\x5e\x7a\xfd\x6a"
|
||||
"\x6a\x02\x6e\x41\x87\x68\x38\x77"
|
||||
"\xfa\xa9\x44\x43\x2d\xef\x09\xdf",
|
||||
.expected_ss =
|
||||
"\xea\x17\x6f\x7e\x6e\x57\x26\x38"
|
||||
"\x8b\xfb\x41\xeb\xba\xc8\x6d\xa5"
|
||||
"\xa8\x72\xd1\xff\xc9\x47\x3d\xaa"
|
||||
"\x58\x43\x9f\x34\x0f\x8c\xf3\xc9",
|
||||
.b_public =
|
||||
"\xcc\xb4\xda\x74\xb1\x47\x3f\xea"
|
||||
"\x6c\x70\x9e\x38\x2d\xc7\xaa\xb7"
|
||||
"\x29\xb2\x47\x03\x19\xab\xdd\x34"
|
||||
"\xbd\xa8\x2c\x93\xe1\xa4\x74\xd9"
|
||||
"\x64\x63\xf7\x70\x20\x2f\xa4\xe6"
|
||||
"\x9f\x4a\x38\xcc\xc0\x2c\x49\x2f"
|
||||
"\xb1\x32\xbb\xaf\x22\x61\xda\xcb"
|
||||
"\x6f\xdb\xa9\xaa\xfc\x77\x81\xf3",
|
||||
.secret_size = 40,
|
||||
.b_public_size = 64,
|
||||
.expected_a_public_size = 64,
|
||||
.expected_ss_size = 32
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* MD4 test vectors from RFC1320
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,30 @@
|
|||
/*
|
||||
* ECDH params to be used with kpp API
|
||||
*
|
||||
* Copyright (c) 2016, Intel Corporation
|
||||
* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
|
||||
*
|
||||
* 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 _CRYPTO_ECDH_
|
||||
#define _CRYPTO_ECDH_
|
||||
|
||||
/* Curves IDs */
|
||||
#define ECC_CURVE_NIST_P192 0x0001
|
||||
#define ECC_CURVE_NIST_P256 0x0002
|
||||
|
||||
struct ecdh {
|
||||
unsigned short curve_id;
|
||||
char *key;
|
||||
unsigned short key_size;
|
||||
};
|
||||
|
||||
int crypto_ecdh_key_len(const struct ecdh *params);
|
||||
int crypto_ecdh_encode_key(char *buf, unsigned int len, const struct ecdh *p);
|
||||
int crypto_ecdh_decode_key(const char *buf, unsigned int len, struct ecdh *p);
|
||||
|
||||
#endif
|
||||
|
|
@ -243,6 +243,7 @@ static inline void kpp_request_set_output(struct kpp_request *req,
|
|||
enum {
|
||||
CRYPTO_KPP_SECRET_TYPE_UNKNOWN,
|
||||
CRYPTO_KPP_SECRET_TYPE_DH,
|
||||
CRYPTO_KPP_SECRET_TYPE_ECDH,
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in New Issue