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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Public Key Signature Algorithm
*
* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
*/
#include <crypto/internal/sig.h>
#include <linux/cryptouser.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>
#include "internal.h"
static void crypto_sig_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_sig *sig = __crypto_sig_tfm(tfm);
struct sig_alg *alg = crypto_sig_alg(sig);
alg->exit(sig);
}
static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_sig *sig = __crypto_sig_tfm(tfm);
struct sig_alg *alg = crypto_sig_alg(sig);
if (alg->exit)
sig->base.exit = crypto_sig_exit_tfm;
if (alg->init)
return alg->init(sig);
return 0;
}
static void crypto_sig_free_instance(struct crypto_instance *inst)
{
struct sig_instance *sig = sig_instance(inst);
sig->free(sig);
}
static void __maybe_unused crypto_sig_show(struct seq_file *m,
struct crypto_alg *alg)
{
seq_puts(m, "type : sig\n");
}
static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
struct crypto_alg *alg)
{
struct crypto_report_sig rsig = {};
strscpy(rsig.type, "sig", sizeof(rsig.type));
return nla_put(skb, CRYPTOCFGA_REPORT_SIG, sizeof(rsig), &rsig);
}
static const struct crypto_type crypto_sig_type = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_sig_init_tfm,
.free = crypto_sig_free_instance,
#ifdef CONFIG_PROC_FS
.show = crypto_sig_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
.report = crypto_sig_report,
#endif
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_MASK,
.type = CRYPTO_ALG_TYPE_SIG,
.tfmsize = offsetof(struct crypto_sig, base),
.algsize = offsetof(struct sig_alg, base),
};
struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
{
return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_sig);
static int sig_default_sign(struct crypto_sig *tfm,
const void *src, unsigned int slen,
void *dst, unsigned int dlen)
{
return -ENOSYS;
}
static int sig_default_verify(struct crypto_sig *tfm,
const void *src, unsigned int slen,
const void *dst, unsigned int dlen)
{
return -ENOSYS;
}
static int sig_default_set_key(struct crypto_sig *tfm,
const void *key, unsigned int keylen)
{
return -ENOSYS;
}
static unsigned int sig_default_size(struct crypto_sig *tfm)
{
return DIV_ROUND_UP_POW2(crypto_sig_keysize(tfm), BITS_PER_BYTE);
}
static int sig_prepare_alg(struct sig_alg *alg)
{
struct crypto_alg *base = &alg->base;
if (!alg->sign)
alg->sign = sig_default_sign;
if (!alg->verify)
alg->verify = sig_default_verify;
if (!alg->set_priv_key)
alg->set_priv_key = sig_default_set_key;
if (!alg->set_pub_key)
return -EINVAL;
if (!alg->key_size)
return -EINVAL;
if (!alg->max_size)
alg->max_size = sig_default_size;
if (!alg->digest_size)
alg->digest_size = sig_default_size;
base->cra_type = &crypto_sig_type;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
base->cra_flags |= CRYPTO_ALG_TYPE_SIG;
return 0;
}
int crypto_register_sig(struct sig_alg *alg)
{
struct crypto_alg *base = &alg->base;
int err;
err = sig_prepare_alg(alg);
if (err)
return err;
return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_sig);
void crypto_unregister_sig(struct sig_alg *alg)
{
crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_sig);
int sig_register_instance(struct crypto_template *tmpl,
struct sig_instance *inst)
{
int err;
if (WARN_ON(!inst->free))
return -EINVAL;
err = sig_prepare_alg(&inst->alg);
if (err)
return err;
return crypto_register_instance(tmpl, sig_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(sig_register_instance);
int crypto_grab_sig(struct crypto_sig_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
spawn->base.frontend = &crypto_sig_type;
return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_sig);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Public Key Signature Algorithms");
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