130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/* In-software asymmetric public-key crypto subtype
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*
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* See Documentation/crypto/asymmetric-keys.txt
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "PKEY: "fmt
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <keys/asymmetric-subtype.h>
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#include "public_key.h"
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MODULE_LICENSE("GPL");
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const char *const pkey_algo_name[PKEY_ALGO__LAST] = {
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[PKEY_ALGO_DSA] = "DSA",
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[PKEY_ALGO_RSA] = "RSA",
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};
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EXPORT_SYMBOL_GPL(pkey_algo_name);
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const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST] = {
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#if defined(CONFIG_PUBLIC_KEY_ALGO_RSA) || \
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defined(CONFIG_PUBLIC_KEY_ALGO_RSA_MODULE)
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[PKEY_ALGO_RSA] = &RSA_public_key_algorithm,
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#endif
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};
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EXPORT_SYMBOL_GPL(pkey_algo);
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const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = {
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[PKEY_ID_PGP] = "PGP",
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[PKEY_ID_X509] = "X509",
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};
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EXPORT_SYMBOL_GPL(pkey_id_type_name);
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/*
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* Provide a part of a description of the key for /proc/keys.
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*/
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static void public_key_describe(const struct key *asymmetric_key,
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struct seq_file *m)
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{
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struct public_key *key = asymmetric_key->payload.data;
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if (key)
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seq_printf(m, "%s.%s",
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pkey_id_type_name[key->id_type], key->algo->name);
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}
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/*
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* Destroy a public key algorithm key.
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*/
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void public_key_destroy(void *payload)
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{
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struct public_key *key = payload;
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int i;
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if (key) {
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for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
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mpi_free(key->mpi[i]);
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kfree(key);
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}
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}
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EXPORT_SYMBOL_GPL(public_key_destroy);
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/*
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* Verify a signature using a public key.
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*/
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int public_key_verify_signature(const struct public_key *pk,
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const struct public_key_signature *sig)
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{
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const struct public_key_algorithm *algo;
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BUG_ON(!pk);
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BUG_ON(!pk->mpi[0]);
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BUG_ON(!pk->mpi[1]);
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BUG_ON(!sig);
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BUG_ON(!sig->digest);
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BUG_ON(!sig->mpi[0]);
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algo = pk->algo;
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if (!algo) {
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if (pk->pkey_algo >= PKEY_ALGO__LAST)
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return -ENOPKG;
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algo = pkey_algo[pk->pkey_algo];
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if (!algo)
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return -ENOPKG;
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}
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if (!algo->verify_signature)
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return -ENOTSUPP;
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if (sig->nr_mpi != algo->n_sig_mpi) {
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pr_debug("Signature has %u MPI not %u\n",
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sig->nr_mpi, algo->n_sig_mpi);
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return -EINVAL;
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}
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return algo->verify_signature(pk, sig);
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}
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EXPORT_SYMBOL_GPL(public_key_verify_signature);
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static int public_key_verify_signature_2(const struct key *key,
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const struct public_key_signature *sig)
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{
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const struct public_key *pk = key->payload.data;
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return public_key_verify_signature(pk, sig);
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}
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/*
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* Public key algorithm asymmetric key subtype
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*/
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struct asymmetric_key_subtype public_key_subtype = {
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.owner = THIS_MODULE,
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.name = "public_key",
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.name_len = sizeof("public_key") - 1,
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.describe = public_key_describe,
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.destroy = public_key_destroy,
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.verify_signature = public_key_verify_signature_2,
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};
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EXPORT_SYMBOL_GPL(public_key_subtype);
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