[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / asymmetric_keys / public_key.c

/* 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 "public_key.h"

MODULE_LICENSE("GPL");

const char *const pkey_algo[PKEY_ALGO__LAST] = {
	[PKEY_ALGO_DSA]		= "DSA",
	[PKEY_ALGO_RSA]		= "RSA",
};
EXPORT_SYMBOL_GPL(pkey_algo);

const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
	[PKEY_HASH_MD4]		= "md4",
	[PKEY_HASH_MD5]		= "md5",
	[PKEY_HASH_SHA1]	= "sha1",
	[PKEY_HASH_RIPE_MD_160]	= "rmd160",
	[PKEY_HASH_SHA256]	= "sha256",
	[PKEY_HASH_SHA384]	= "sha384",
	[PKEY_HASH_SHA512]	= "sha512",
	[PKEY_HASH_SHA224]	= "sha224",
};
EXPORT_SYMBOL_GPL(pkey_hash_algo);

const char *const pkey_id_type[PKEY_ID_TYPE__LAST] = {
	[PKEY_ID_PGP]		= "PGP",
	[PKEY_ID_X509]		= "X509",
};
EXPORT_SYMBOL_GPL(pkey_id_type);

/*
 * 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;

	if (key)
		seq_printf(m, "%s.%s",
			   pkey_id_type[key->id_type], key->algo->name);
}

/*
 * Destroy a public key algorithm key.
 */
void public_key_destroy(void *payload)
{
	struct public_key *key = payload;
	int i;

	if (key) {
		for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
			mpi_free(key->mpi[i]);
		kfree(key);
	}
}
EXPORT_SYMBOL_GPL(public_key_destroy);

/*
 * Verify a signature using a public key.
 */
static int public_key_verify_signature(const struct key *key,
				       const struct public_key_signature *sig)
{
	const struct public_key *pk = key->payload.data;

	if (!pk->algo->verify_signature)
		return -ENOTSUPP;

	if (sig->nr_mpi != pk->algo->n_sig_mpi) {
		pr_debug("Signature has %u MPI not %u\n",
			 sig->nr_mpi, pk->algo->n_sig_mpi);
		return -EINVAL;
	}

	return pk->algo->verify_signature(pk, sig);
}

/*
 * Public key algorithm asymmetric key subtype
 */
struct asymmetric_key_subtype public_key_subtype = {
	.owner			= THIS_MODULE,
	.name			= "public_key",
	.describe		= public_key_describe,
	.destroy		= public_key_destroy,
	.verify_signature	= public_key_verify_signature,
};
EXPORT_SYMBOL_GPL(public_key_subtype);
Commit	Line	Data
a9681bf3 DH	1	/* In-software asymmetric public-key crypto subtype
	2	*
	3	* See Documentation/crypto/asymmetric-keys.txt
	4	*
	5	* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
	6	* Written by David Howells (dhowells@redhat.com)
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public Licence
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the Licence, or (at your option) any later version.
	12	*/
	13
	14	#define pr_fmt(fmt) "PKEY: "fmt
	15	#include <linux/module.h>
	16	#include <linux/export.h>
	17	#include <linux/kernel.h>
	18	#include <linux/slab.h>
	19	#include <linux/seq_file.h>
	20	#include <keys/asymmetric-subtype.h>
	21	#include "public_key.h"
	22
	23	MODULE_LICENSE("GPL");
	24
	25	const char *const pkey_algo[PKEY_ALGO__LAST] = {
	26	[PKEY_ALGO_DSA] = "DSA",
	27	[PKEY_ALGO_RSA] = "RSA",
	28	};
	29	EXPORT_SYMBOL_GPL(pkey_algo);
	30
	31	const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
	32	[PKEY_HASH_MD4] = "md4",
	33	[PKEY_HASH_MD5] = "md5",
	34	[PKEY_HASH_SHA1] = "sha1",
	35	[PKEY_HASH_RIPE_MD_160] = "rmd160",
	36	[PKEY_HASH_SHA256] = "sha256",
	37	[PKEY_HASH_SHA384] = "sha384",
	38	[PKEY_HASH_SHA512] = "sha512",
	39	[PKEY_HASH_SHA224] = "sha224",
	40	};
	41	EXPORT_SYMBOL_GPL(pkey_hash_algo);
	42
	43	const char *const pkey_id_type[PKEY_ID_TYPE__LAST] = {
	44	[PKEY_ID_PGP] = "PGP",
	45	[PKEY_ID_X509] = "X509",
	46	};
	47	EXPORT_SYMBOL_GPL(pkey_id_type);
	48
	49	/*
	50	* Provide a part of a description of the key for /proc/keys.
	51	*/
	52	static void public_key_describe(const struct key *asymmetric_key,
	53	struct seq_file *m)
	54	{
	55	struct public_key *key = asymmetric_key->payload.data;
	56
	57	if (key)
	58	seq_printf(m, "%s.%s",
	59	pkey_id_type[key->id_type], key->algo->name);
	60	}
	61
	62	/*
	63	* Destroy a public key algorithm key.
	64	*/
65	void public_key_destroy(void *payload)
66	{
67	struct public_key *key = payload;
68	int i;
69
70	if (key) {
71	for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
72	mpi_free(key->mpi[i]);
73	kfree(key);
74	}
75	}
76	EXPORT_SYMBOL_GPL(public_key_destroy);
77
78	/*
79	* Verify a signature using a public key.
80	*/
81	static int public_key_verify_signature(const struct key *key,
82	const struct public_key_signature *sig)
83	{
84	const struct public_key *pk = key->payload.data;
85
86	if (!pk->algo->verify_signature)
87	return -ENOTSUPP;
88
89	if (sig->nr_mpi != pk->algo->n_sig_mpi) {
90	pr_debug("Signature has %u MPI not %u\n",
91	sig->nr_mpi, pk->algo->n_sig_mpi);
92	return -EINVAL;
93	}
94
95	return pk->algo->verify_signature(pk, sig);
96	}
97
98	/*
99	* Public key algorithm asymmetric key subtype
100	*/
101	struct asymmetric_key_subtype public_key_subtype = {
102	.owner = THIS_MODULE,
103	.name = "public_key",
104	.describe = public_key_describe,
105	.destroy = public_key_destroy,
106	.verify_signature = public_key_verify_signature,
107	};
108	EXPORT_SYMBOL_GPL(public_key_subtype);