db6c43bd21
This patch converts the module verification code to the new akcipher API. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David Howells <dhowells@redhat.com>
111 lines
2.7 KiB
C
111 lines
2.7 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 <crypto/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 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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[PKEY_ID_PKCS7] = "PKCS#7",
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};
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EXPORT_SYMBOL_GPL(pkey_id_type_name);
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static int (*alg_verify[PKEY_ALGO__LAST])(const struct public_key *pkey,
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const struct public_key_signature *sig) = {
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NULL,
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rsa_verify_signature
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};
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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[asym_crypto];
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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],
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pkey_algo_name[key->pkey_algo]);
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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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if (key)
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kfree(key->key);
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kfree(key);
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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 *pkey,
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const struct public_key_signature *sig)
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{
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BUG_ON(!pkey);
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BUG_ON(!sig);
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BUG_ON(!sig->digest);
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BUG_ON(!sig->s);
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if (pkey->pkey_algo >= PKEY_ALGO__LAST)
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return -ENOPKG;
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if (!alg_verify[pkey->pkey_algo])
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return -ENOPKG;
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return alg_verify[pkey->pkey_algo](pkey, 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[asym_crypto];
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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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