/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Signature verification
 *
 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#ifndef _LINUX_VERIFICATION_H
#define _LINUX_VERIFICATION_H

#include <linux/errno.h>
#include <linux/types.h>

/*
 * Indicate that both builtin trusted keys and secondary trusted keys
 * should be used.
 */
#define VERIFY_USE_SECONDARY_KEYRING ((struct key *)1UL)
#define VERIFY_USE_PLATFORM_KEYRING  ((struct key *)2UL)

static inline int system_keyring_id_check(u64 id)
{
    if (id > (unsigned long)VERIFY_USE_PLATFORM_KEYRING)
        return -EINVAL;

    return 0;
}

/*
 * The use to which an asymmetric key is being put.
 */
enum key_being_used_for {
    VERIFYING_MODULE_SIGNATURE,
    VERIFYING_FIRMWARE_SIGNATURE,
    VERIFYING_KEXEC_PE_SIGNATURE,
    VERIFYING_KEY_SIGNATURE,
    VERIFYING_KEY_SELF_SIGNATURE,
    VERIFYING_UNSPECIFIED_SIGNATURE,
    NR__KEY_BEING_USED_FOR
};
extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];

#ifdef CONFIG_SYSTEM_DATA_VERIFICATION

struct key;
struct pkcs7_message;

extern int verify_pkcs7_signature(const void *data, size_t len,
                  const void *raw_pkcs7, size_t pkcs7_len,
                  struct key *trusted_keys,
                  enum key_being_used_for usage,
                  int (*view_content)(void *ctx,
                              const void *data, size_t len,
                              size_t asn1hdrlen),
                  void *ctx);
extern int verify_pkcs7_message_sig(const void *data, size_t len,
                    struct pkcs7_message *pkcs7,
                    struct key *trusted_keys,
                    enum key_being_used_for usage,
                    int (*view_content)(void *ctx,
                            const void *data,
                            size_t len,
                            size_t asn1hdrlen),
                    void *ctx);

#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
                   struct key *trusted_keys,
                   enum key_being_used_for usage);
#endif

#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
#endif /* _LINUX_VERIFY_PEFILE_H */