projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4ae71c1d DH |
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 | ||
| c3ce6dfa | 14 | #define pr_fmt(fmt) "SIG: "fmt |
| 4ae71c1d | 15 | #include <keys/asymmetric-subtype.h> |
| 1f6a9ab0 | 16 | #include <linux/export.h> |
| 4ae71c1d DH |
17 | #include <linux/err.h> |
| 18 | #include <crypto/public_key.h> | |
| 19 | #include "asymmetric_keys.h" | |
| 20 | ||
| 21 | /** | |
| 22 | * verify_signature - Initiate the use of an asymmetric key to verify a signature | |
| 23 | * @key: The asymmetric key to verify against | |
| 24 | * @sig: The signature to check | |
| 25 | * | |
| 26 | * Returns 0 if successful or else an error. | |
| 27 | */ | |
| 28 | int verify_signature(const struct key *key, | |
| 29 | const struct public_key_signature *sig) | |
| 30 | { | |
| 31 | const struct asymmetric_key_subtype *subtype; | |
| 32 | int ret; | |
| 33 | ||
| 34 | pr_devel("==>%s()\n", __func__); | |
| 35 | ||
| 36 | if (key->type != &key_type_asymmetric) | |
| 37 | return -EINVAL; | |
| 38 | subtype = asymmetric_key_subtype(key); | |
| 39 | if (!subtype || | |
| 146aa8b1 | 40 | !key->payload.data[0]) |
| 4ae71c1d DH |
41 | return -EINVAL; |
| 42 | if (!subtype->verify_signature) | |
| 43 | return -ENOTSUPP; | |
| 44 | ||
| 45 | ret = subtype->verify_signature(key, sig); | |
| 46 | ||
| 47 | pr_devel("<==%s() = %d\n", __func__, ret); | |
| 48 | return ret; | |
| 49 | } | |
| 50 | EXPORT_SYMBOL_GPL(verify_signature); |