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/* In-software asymmetric public-key crypto subtype
*
* See Documentation/crypto/asymmetric-keys.txt
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* 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.
*/
#define pr_fmt(fmt) "PKEY: "fmt
#include <linux/module.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <keys/asymmetric-subtype.h>
#include <crypto/public_key.h>
MODULE_LICENSE("GPL");
const char *const pkey_algo_name[PKEY_ALGO__LAST] = {
[PKEY_ALGO_DSA] = "dsa",
[PKEY_ALGO_RSA] = "rsa",
};
EXPORT_SYMBOL_GPL(pkey_algo_name);
const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = {
[PKEY_ID_PGP] = "PGP",
[PKEY_ID_X509] = "X509",
[PKEY_ID_PKCS7] = "PKCS#7",
};
EXPORT_SYMBOL_GPL(pkey_id_type_name);
static int (*alg_verify[PKEY_ALGO__LAST])(const struct public_key *pkey,
const struct public_key_signature *sig) = {
NULL,
rsa_verify_signature
};
/*
* Provide a part of a description of the key for /proc/keys.
*/
static void public_key_describe(const struct key *asymmetric_key,
struct seq_file *m)
{
struct public_key *key = asymmetric_key->payload.data[asym_crypto];
if (key)
seq_printf(m, "%s.%s",
pkey_id_type_name[key->id_type],
pkey_algo_name[key->pkey_algo]);
}
/*
* Destroy a public key algorithm key.
*/
void public_key_destroy(void *payload)
{
struct public_key *key = payload;
if (key)
kfree(key->key);
kfree(key);
}
EXPORT_SYMBOL_GPL(public_key_destroy);
/*
* Verify a signature using a public key.
*/
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig)
{
BUG_ON(!pkey);
BUG_ON(!sig);
BUG_ON(!sig->digest);
BUG_ON(!sig->s);
if (pkey->pkey_algo >= PKEY_ALGO__LAST)
return -ENOPKG;
if (!alg_verify[pkey->pkey_algo])
return -ENOPKG;
return alg_verify[pkey->pkey_algo](pkey, sig);
}
EXPORT_SYMBOL_GPL(public_key_verify_signature);
static int public_key_verify_signature_2(const struct key *key,
const struct public_key_signature *sig)
{
const struct public_key *pk = key->payload.data[asym_crypto];
return public_key_verify_signature(pk, sig);
}
/*
* Public key algorithm asymmetric key subtype
*/
struct asymmetric_key_subtype public_key_subtype = {
.owner = THIS_MODULE,
.name = "public_key",
.name_len = sizeof("public_key") - 1,
.describe = public_key_describe,
.destroy = public_key_destroy,
.verify_signature = public_key_verify_signature_2,
};
EXPORT_SYMBOL_GPL(public_key_subtype);
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