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4e5f2c4007
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>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/*
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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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