160 строки
4.4 KiB
C
160 строки
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* Signature verification with an asymmetric key
|
|
*
|
|
* See Documentation/crypto/asymmetric-keys.rst
|
|
*
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "SIG: "fmt
|
|
#include <keys/asymmetric-subtype.h>
|
|
#include <linux/export.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/keyctl.h>
|
|
#include <crypto/public_key.h>
|
|
#include <keys/user-type.h>
|
|
#include "asymmetric_keys.h"
|
|
|
|
/*
|
|
* Destroy a public key signature.
|
|
*/
|
|
void public_key_signature_free(struct public_key_signature *sig)
|
|
{
|
|
int i;
|
|
|
|
if (sig) {
|
|
for (i = 0; i < ARRAY_SIZE(sig->auth_ids); i++)
|
|
kfree(sig->auth_ids[i]);
|
|
kfree(sig->s);
|
|
kfree(sig->digest);
|
|
kfree(sig);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(public_key_signature_free);
|
|
|
|
/**
|
|
* query_asymmetric_key - Get information about an aymmetric key.
|
|
* @params: Various parameters.
|
|
* @info: Where to put the information.
|
|
*/
|
|
int query_asymmetric_key(const struct kernel_pkey_params *params,
|
|
struct kernel_pkey_query *info)
|
|
{
|
|
const struct asymmetric_key_subtype *subtype;
|
|
struct key *key = params->key;
|
|
int ret;
|
|
|
|
pr_devel("==>%s()\n", __func__);
|
|
|
|
if (key->type != &key_type_asymmetric)
|
|
return -EINVAL;
|
|
subtype = asymmetric_key_subtype(key);
|
|
if (!subtype ||
|
|
!key->payload.data[0])
|
|
return -EINVAL;
|
|
if (!subtype->query)
|
|
return -ENOTSUPP;
|
|
|
|
ret = subtype->query(params, info);
|
|
|
|
pr_devel("<==%s() = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(query_asymmetric_key);
|
|
|
|
/**
|
|
* encrypt_blob - Encrypt data using an asymmetric key
|
|
* @params: Various parameters
|
|
* @data: Data blob to be encrypted, length params->data_len
|
|
* @enc: Encrypted data buffer, length params->enc_len
|
|
*
|
|
* Encrypt the specified data blob using the private key specified by
|
|
* params->key. The encrypted data is wrapped in an encoding if
|
|
* params->encoding is specified (eg. "pkcs1").
|
|
*
|
|
* Returns the length of the data placed in the encrypted data buffer or an
|
|
* error.
|
|
*/
|
|
int encrypt_blob(struct kernel_pkey_params *params,
|
|
const void *data, void *enc)
|
|
{
|
|
params->op = kernel_pkey_encrypt;
|
|
return asymmetric_key_eds_op(params, data, enc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(encrypt_blob);
|
|
|
|
/**
|
|
* decrypt_blob - Decrypt data using an asymmetric key
|
|
* @params: Various parameters
|
|
* @enc: Encrypted data to be decrypted, length params->enc_len
|
|
* @data: Decrypted data buffer, length params->data_len
|
|
*
|
|
* Decrypt the specified data blob using the private key specified by
|
|
* params->key. The decrypted data is wrapped in an encoding if
|
|
* params->encoding is specified (eg. "pkcs1").
|
|
*
|
|
* Returns the length of the data placed in the decrypted data buffer or an
|
|
* error.
|
|
*/
|
|
int decrypt_blob(struct kernel_pkey_params *params,
|
|
const void *enc, void *data)
|
|
{
|
|
params->op = kernel_pkey_decrypt;
|
|
return asymmetric_key_eds_op(params, enc, data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(decrypt_blob);
|
|
|
|
/**
|
|
* create_signature - Sign some data using an asymmetric key
|
|
* @params: Various parameters
|
|
* @data: Data blob to be signed, length params->data_len
|
|
* @enc: Signature buffer, length params->enc_len
|
|
*
|
|
* Sign the specified data blob using the private key specified by params->key.
|
|
* The signature is wrapped in an encoding if params->encoding is specified
|
|
* (eg. "pkcs1"). If the encoding needs to know the digest type, this can be
|
|
* passed through params->hash_algo (eg. "sha1").
|
|
*
|
|
* Returns the length of the data placed in the signature buffer or an error.
|
|
*/
|
|
int create_signature(struct kernel_pkey_params *params,
|
|
const void *data, void *enc)
|
|
{
|
|
params->op = kernel_pkey_sign;
|
|
return asymmetric_key_eds_op(params, data, enc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(create_signature);
|
|
|
|
/**
|
|
* verify_signature - Initiate the use of an asymmetric key to verify a signature
|
|
* @key: The asymmetric key to verify against
|
|
* @sig: The signature to check
|
|
*
|
|
* Returns 0 if successful or else an error.
|
|
*/
|
|
int verify_signature(const struct key *key,
|
|
const struct public_key_signature *sig)
|
|
{
|
|
const struct asymmetric_key_subtype *subtype;
|
|
int ret;
|
|
|
|
pr_devel("==>%s()\n", __func__);
|
|
|
|
if (key->type != &key_type_asymmetric)
|
|
return -EINVAL;
|
|
subtype = asymmetric_key_subtype(key);
|
|
if (!subtype ||
|
|
!key->payload.data[0])
|
|
return -EINVAL;
|
|
if (!subtype->verify_signature)
|
|
return -ENOTSUPP;
|
|
|
|
ret = subtype->verify_signature(key, sig);
|
|
|
|
pr_devel("<==%s() = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(verify_signature);
|