linux/crypto/asymmetric_keys/signature.c
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   1/* Signature verification with an asymmetric key
   2 *
   3 * See Documentation/security/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#include <keys/asymmetric-subtype.h>
  15#include <linux/module.h>
  16#include <linux/err.h>
  17#include <crypto/public_key.h>
  18#include "asymmetric_keys.h"
  19
  20/**
  21 * verify_signature - Initiate the use of an asymmetric key to verify a signature
  22 * @key: The asymmetric key to verify against
  23 * @sig: The signature to check
  24 *
  25 * Returns 0 if successful or else an error.
  26 */
  27int verify_signature(const struct key *key,
  28                     const struct public_key_signature *sig)
  29{
  30        const struct asymmetric_key_subtype *subtype;
  31        int ret;
  32
  33        pr_devel("==>%s()\n", __func__);
  34
  35        if (key->type != &key_type_asymmetric)
  36                return -EINVAL;
  37        subtype = asymmetric_key_subtype(key);
  38        if (!subtype ||
  39            !key->payload.data)
  40                return -EINVAL;
  41        if (!subtype->verify_signature)
  42                return -ENOTSUPP;
  43
  44        ret = subtype->verify_signature(key, sig);
  45
  46        pr_devel("<==%s() = %d\n", __func__, ret);
  47        return ret;
  48}
  49EXPORT_SYMBOL_GPL(verify_signature);
  50
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