crypto: kpp - Key-agreement Protocol Primitives API (KPP)
Add key-agreement protocol primitives (kpp) API which allows to implement primitives required by protocols such as DH and ECDH. The API is composed mainly by the following functions * set_secret() - It allows the user to set his secret, also referred to as his private key, along with the parameters known to both parties involved in the key-agreement session. * generate_public_key() - It generates the public key to be sent to the other counterpart involved in the key-agreement session. The function has to be called after set_params() and set_secret() * generate_secret() - It generates the shared secret for the session Other functions such as init() and exit() are provided for allowing cryptographic hardware to be inizialized properly before use 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
331bf739c4
commit
4e5f2c4007
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@ -93,6 +93,15 @@ config CRYPTO_AKCIPHER
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select CRYPTO_AKCIPHER2
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select CRYPTO_ALGAPI
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config CRYPTO_KPP2
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tristate
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select CRYPTO_ALGAPI2
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config CRYPTO_KPP
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tristate
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select CRYPTO_ALGAPI
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select CRYPTO_KPP2
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config CRYPTO_RSA
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tristate "RSA algorithm"
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select CRYPTO_AKCIPHER
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@ -115,6 +124,7 @@ config CRYPTO_MANAGER2
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select CRYPTO_HASH2
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select CRYPTO_BLKCIPHER2
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select CRYPTO_AKCIPHER2
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select CRYPTO_KPP2
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config CRYPTO_USER
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tristate "Userspace cryptographic algorithm configuration"
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@ -30,6 +30,7 @@ crypto_hash-y += shash.o
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obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
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obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
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obj-$(CONFIG_CRYPTO_KPP2) += kpp.o
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$(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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@ -28,6 +28,7 @@
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#include <crypto/internal/skcipher.h>
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#include <crypto/internal/rng.h>
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#include <crypto/akcipher.h>
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#include <crypto/kpp.h>
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#include "internal.h"
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@ -126,6 +127,21 @@ static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
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return -EMSGSIZE;
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}
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static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_kpp rkpp;
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strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
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sizeof(struct crypto_report_kpp), &rkpp))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static int crypto_report_one(struct crypto_alg *alg,
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struct crypto_user_alg *ualg, struct sk_buff *skb)
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{
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@ -176,6 +192,10 @@ static int crypto_report_one(struct crypto_alg *alg,
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goto nla_put_failure;
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break;
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case CRYPTO_ALG_TYPE_KPP:
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if (crypto_report_kpp(skb, alg))
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goto nla_put_failure;
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break;
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}
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out:
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@ -0,0 +1,123 @@
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/*
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* Key-agreement Protocol Primitives (KPP)
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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 modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <linux/cryptouser.h>
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#include <net/netlink.h>
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#include <crypto/kpp.h>
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#include <crypto/internal/kpp.h>
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#include "internal.h"
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#ifdef CONFIG_NET
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static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_kpp rkpp;
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strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
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if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
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sizeof(struct crypto_report_kpp), &rkpp))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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#else
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static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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return -ENOSYS;
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}
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#endif
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static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_puts(m, "type : kpp\n");
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}
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static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
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struct kpp_alg *alg = crypto_kpp_alg(kpp);
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alg->exit(kpp);
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}
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static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
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struct kpp_alg *alg = crypto_kpp_alg(kpp);
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if (alg->exit)
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kpp->base.exit = crypto_kpp_exit_tfm;
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if (alg->init)
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return alg->init(kpp);
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return 0;
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}
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static const struct crypto_type crypto_kpp_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_kpp_init_tfm,
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#ifdef CONFIG_PROC_FS
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.show = crypto_kpp_show,
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#endif
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.report = crypto_kpp_report,
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_KPP,
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.tfmsize = offsetof(struct crypto_kpp, base),
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};
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struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
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static void kpp_prepare_alg(struct kpp_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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base->cra_type = &crypto_kpp_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
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}
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int crypto_register_kpp(struct kpp_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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kpp_prepare_alg(alg);
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_kpp);
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void crypto_unregister_kpp(struct kpp_alg *alg)
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{
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crypto_unregister_alg(&alg->base);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Key-agreement Protocol Primitives");
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@ -0,0 +1,64 @@
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/*
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* Key-agreement Protocol Primitives (KPP)
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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 modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_KPP_INT_H
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#define _CRYPTO_KPP_INT_H
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#include <crypto/kpp.h>
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#include <crypto/algapi.h>
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/*
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* Transform internal helpers.
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*/
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static inline void *kpp_request_ctx(struct kpp_request *req)
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{
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return req->__ctx;
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}
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static inline void *kpp_tfm_ctx(struct crypto_kpp *tfm)
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{
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return tfm->base.__crt_ctx;
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}
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static inline void kpp_request_complete(struct kpp_request *req, int err)
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{
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req->base.complete(&req->base, err);
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}
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static inline const char *kpp_alg_name(struct crypto_kpp *tfm)
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{
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return crypto_kpp_tfm(tfm)->__crt_alg->cra_name;
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}
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/**
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* crypto_register_kpp() -- Register key-agreement protocol primitives algorithm
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*
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* Function registers an implementation of a key-agreement protocol primitive
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* algorithm
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*
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* @alg: algorithm definition
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*
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* Return: zero on success; error code in case of error
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*/
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int crypto_register_kpp(struct kpp_alg *alg);
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/**
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* crypto_unregister_kpp() -- Unregister key-agreement protocol primitive
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* algorithm
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*
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* Function unregisters an implementation of a key-agreement protocol primitive
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* algorithm
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*
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* @alg: algorithm definition
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*/
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void crypto_unregister_kpp(struct kpp_alg *alg);
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#endif
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@ -0,0 +1,328 @@
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/*
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* Key-agreement Protocol Primitives (KPP)
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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 modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_KPP_
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#define _CRYPTO_KPP_
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#include <linux/crypto.h>
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/**
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* struct kpp_request
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*
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* @base: Common attributes for async crypto requests
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* @src: Source data
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* @dst: Destination data
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* @src_len: Size of the input buffer
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* @dst_len: Size of the output buffer. It needs to be at least
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* as big as the expected result depending on the operation
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* After operation it will be updated with the actual size of the
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* result. In case of error where the dst sgl size was insufficient,
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* it will be updated to the size required for the operation.
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* @__ctx: Start of private context data
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*/
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struct kpp_request {
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struct crypto_async_request base;
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struct scatterlist *src;
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struct scatterlist *dst;
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unsigned int src_len;
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unsigned int dst_len;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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/**
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* struct crypto_kpp - user-instantiated object which encapsulate
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* algorithms and core processing logic
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*
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* @base: Common crypto API algorithm data structure
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*/
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struct crypto_kpp {
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struct crypto_tfm base;
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};
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/**
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* struct kpp_alg - generic key-agreement protocol primitives
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*
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* @set_secret: Function invokes the protocol specific function to
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* store the secret private key along with parameters.
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* The implementation knows how to decode thie buffer
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* @generate_public_key: Function generate the public key to be sent to the
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* counterpart. In case of error, where output is not big
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* enough req->dst_len will be updated to the size
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* required
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* @compute_shared_secret: Function compute the shared secret as defined by
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* the algorithm. The result is given back to the user.
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* In case of error, where output is not big enough,
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* req->dst_len will be updated to the size required
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* @max_size: Function returns the size of the output buffer
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* @init: Initialize the object. This is called only once at
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* instantiation time. In case the cryptographic hardware
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* needs to be initialized. Software fallback should be
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* put in place here.
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* @exit: Undo everything @init did.
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*
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* @reqsize: Request context size required by algorithm
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* implementation
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* @base Common crypto API algorithm data structure
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*/
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struct kpp_alg {
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int (*set_secret)(struct crypto_kpp *tfm, void *buffer,
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unsigned int len);
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int (*generate_public_key)(struct kpp_request *req);
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int (*compute_shared_secret)(struct kpp_request *req);
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int (*max_size)(struct crypto_kpp *tfm);
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int (*init)(struct crypto_kpp *tfm);
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void (*exit)(struct crypto_kpp *tfm);
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unsigned int reqsize;
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struct crypto_alg base;
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};
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/**
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* DOC: Generic Key-agreement Protocol Primitevs API
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*
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* The KPP API is used with the algorithm type
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* CRYPTO_ALG_TYPE_KPP (listed as type "kpp" in /proc/crypto)
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*/
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/**
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* crypto_alloc_kpp() - allocate KPP tfm handle
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* @alg_name: is the name of the kpp algorithm (e.g. "dh", "ecdh")
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* @type: specifies the type of the algorithm
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* @mask: specifies the mask for the algorithm
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*
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* Allocate a handle for kpp algorithm. The returned struct crypto_kpp
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* is requeried for any following API invocation
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*
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* Return: allocated handle in case of success; IS_ERR() is true in case of
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* an error, PTR_ERR() returns the error code.
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*/
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struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask);
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static inline struct crypto_tfm *crypto_kpp_tfm(struct crypto_kpp *tfm)
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{
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return &tfm->base;
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}
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static inline struct kpp_alg *__crypto_kpp_alg(struct crypto_alg *alg)
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{
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return container_of(alg, struct kpp_alg, base);
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}
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static inline struct crypto_kpp *__crypto_kpp_tfm(struct crypto_tfm *tfm)
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{
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return container_of(tfm, struct crypto_kpp, base);
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}
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static inline struct kpp_alg *crypto_kpp_alg(struct crypto_kpp *tfm)
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{
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return __crypto_kpp_alg(crypto_kpp_tfm(tfm)->__crt_alg);
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}
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static inline unsigned int crypto_kpp_reqsize(struct crypto_kpp *tfm)
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{
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return crypto_kpp_alg(tfm)->reqsize;
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}
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static inline void kpp_request_set_tfm(struct kpp_request *req,
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struct crypto_kpp *tfm)
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{
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req->base.tfm = crypto_kpp_tfm(tfm);
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}
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static inline struct crypto_kpp *crypto_kpp_reqtfm(struct kpp_request *req)
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{
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return __crypto_kpp_tfm(req->base.tfm);
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}
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/**
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* crypto_free_kpp() - free KPP tfm handle
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*
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* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
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*/
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static inline void crypto_free_kpp(struct crypto_kpp *tfm)
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{
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crypto_destroy_tfm(tfm, crypto_kpp_tfm(tfm));
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}
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/**
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* kpp_request_alloc() - allocates kpp request
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*
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* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
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* @gfp: allocation flags
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*
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* Return: allocated handle in case of success or NULL in case of an error.
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*/
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static inline struct kpp_request *kpp_request_alloc(struct crypto_kpp *tfm,
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gfp_t gfp)
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{
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struct kpp_request *req;
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req = kmalloc(sizeof(*req) + crypto_kpp_reqsize(tfm), gfp);
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if (likely(req))
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kpp_request_set_tfm(req, tfm);
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return req;
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}
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/**
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* kpp_request_free() - zeroize and free kpp request
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*
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* @req: request to free
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*/
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static inline void kpp_request_free(struct kpp_request *req)
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{
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kzfree(req);
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}
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/**
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* kpp_request_set_callback() - Sets an asynchronous callback.
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*
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* Callback will be called when an asynchronous operation on a given
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* request is finished.
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*
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* @req: request that the callback will be set for
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* @flgs: specify for instance if the operation may backlog
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* @cmpl: callback which will be called
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* @data: private data used by the caller
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*/
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static inline void kpp_request_set_callback(struct kpp_request *req,
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u32 flgs,
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crypto_completion_t cmpl,
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void *data)
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{
|
||||
req->base.complete = cmpl;
|
||||
req->base.data = data;
|
||||
req->base.flags = flgs;
|
||||
}
|
||||
|
||||
/**
|
||||
* kpp_request_set_input() - Sets input buffer
|
||||
*
|
||||
* Sets parameters required by generate_public_key
|
||||
*
|
||||
* @req: kpp request
|
||||
* @input: ptr to input scatter list
|
||||
* @input_len: size of the input scatter list
|
||||
*/
|
||||
static inline void kpp_request_set_input(struct kpp_request *req,
|
||||
struct scatterlist *input,
|
||||
unsigned int input_len)
|
||||
{
|
||||
req->src = input;
|
||||
req->src_len = input_len;
|
||||
}
|
||||
|
||||
/**
|
||||
* kpp_request_set_output() - Sets output buffer
|
||||
*
|
||||
* Sets parameters required by kpp operation
|
||||
*
|
||||
* @req: kpp request
|
||||
* @output: ptr to output scatter list
|
||||
* @output_len: size of the output scatter list
|
||||
*/
|
||||
static inline void kpp_request_set_output(struct kpp_request *req,
|
||||
struct scatterlist *output,
|
||||
unsigned int output_len)
|
||||
{
|
||||
req->dst = output;
|
||||
req->dst_len = output_len;
|
||||
}
|
||||
|
||||
enum {
|
||||
CRYPTO_KPP_SECRET_TYPE_UNKNOWN,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct kpp_secret - small header for packing secret buffer
|
||||
*
|
||||
* @type: define type of secret. Each kpp type will define its own
|
||||
* @len: specify the len of the secret, include the header, that
|
||||
* follows the struct
|
||||
*/
|
||||
struct kpp_secret {
|
||||
unsigned short type;
|
||||
unsigned short len;
|
||||
};
|
||||
|
||||
/**
|
||||
* crypto_kpp_set_secret() - Invoke kpp operation
|
||||
*
|
||||
* Function invokes the specific kpp operation for a given alg.
|
||||
*
|
||||
* @tfm: tfm handle
|
||||
*
|
||||
* Return: zero on success; error code in case of error
|
||||
*/
|
||||
static inline int crypto_kpp_set_secret(struct crypto_kpp *tfm, void *buffer,
|
||||
unsigned int len)
|
||||
{
|
||||
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
||||
|
||||
return alg->set_secret(tfm, buffer, len);
|
||||
}
|
||||
|
||||
/**
|
||||
* crypto_kpp_generate_public_key() - Invoke kpp operation
|
||||
*
|
||||
* Function invokes the specific kpp operation for generating the public part
|
||||
* for a given kpp algorithm
|
||||
*
|
||||
* @req: kpp key request
|
||||
*
|
||||
* Return: zero on success; error code in case of error
|
||||
*/
|
||||
static inline int crypto_kpp_generate_public_key(struct kpp_request *req)
|
||||
{
|
||||
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
||||
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
||||
|
||||
return alg->generate_public_key(req);
|
||||
}
|
||||
|
||||
/**
|
||||
* crypto_kpp_compute_shared_secret() - Invoke kpp operation
|
||||
*
|
||||
* Function invokes the specific kpp operation for computing the shared secret
|
||||
* for a given kpp algorithm.
|
||||
*
|
||||
* @req: kpp key request
|
||||
*
|
||||
* Return: zero on success; error code in case of error
|
||||
*/
|
||||
static inline int crypto_kpp_compute_shared_secret(struct kpp_request *req)
|
||||
{
|
||||
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
||||
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
||||
|
||||
return alg->compute_shared_secret(req);
|
||||
}
|
||||
|
||||
/**
|
||||
* crypto_kpp_maxsize() - Get len for output buffer
|
||||
*
|
||||
* Function returns the output buffer size required
|
||||
*
|
||||
* @tfm: KPP tfm handle allocated with crypto_alloc_kpp()
|
||||
*
|
||||
* Return: minimum len for output buffer or error code if key hasn't been set
|
||||
*/
|
||||
static inline int crypto_kpp_maxsize(struct crypto_kpp *tfm)
|
||||
{
|
||||
struct kpp_alg *alg = crypto_kpp_alg(tfm);
|
||||
|
||||
return alg->max_size(tfm);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -48,6 +48,7 @@
|
|||
#define CRYPTO_ALG_TYPE_BLKCIPHER 0x00000004
|
||||
#define CRYPTO_ALG_TYPE_ABLKCIPHER 0x00000005
|
||||
#define CRYPTO_ALG_TYPE_GIVCIPHER 0x00000006
|
||||
#define CRYPTO_ALG_TYPE_KPP 0x00000008
|
||||
#define CRYPTO_ALG_TYPE_RNG 0x0000000c
|
||||
#define CRYPTO_ALG_TYPE_AKCIPHER 0x0000000d
|
||||
#define CRYPTO_ALG_TYPE_DIGEST 0x0000000e
|
||||
|
|
|
|||
|
|
@ -45,6 +45,7 @@ enum crypto_attr_type_t {
|
|||
CRYPTOCFGA_REPORT_RNG, /* struct crypto_report_rng */
|
||||
CRYPTOCFGA_REPORT_CIPHER, /* struct crypto_report_cipher */
|
||||
CRYPTOCFGA_REPORT_AKCIPHER, /* struct crypto_report_akcipher */
|
||||
CRYPTOCFGA_REPORT_KPP, /* struct crypto_report_kpp */
|
||||
__CRYPTOCFGA_MAX
|
||||
|
||||
#define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
|
||||
|
|
@ -107,5 +108,9 @@ struct crypto_report_akcipher {
|
|||
char type[CRYPTO_MAX_NAME];
|
||||
};
|
||||
|
||||
struct crypto_report_kpp {
|
||||
char type[CRYPTO_MAX_NAME];
|
||||
};
|
||||
|
||||
#define CRYPTO_REPORT_MAXSIZE (sizeof(struct crypto_user_alg) + \
|
||||
sizeof(struct crypto_report_blkcipher))
|
||||
|
|
|
|||
Loading…
Reference in New Issue