signature.c

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/* Signature verification with an asymmetric key
 *
 * See Documentation/security/asymmetric-keys.txt
 *
 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * 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.
 */

#include <keys/asymmetric-subtype.h>
#include <linux/module.h>
#include <linux/err.h>
#include <crypto/public_key.h>
#include "asymmetric_keys.h"

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)
        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);