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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Kernelspace interface to the pkey device driver
 *
 * Copyright IBM Corp. 2016
 *
 * Author: Harald Freudenberger <freude@de.ibm.com>
 *
 */

#ifndef _KAPI_PKEY_H
#define _KAPI_PKEY_H

#include <linux/ioctl.h>
#include <linux/types.h>
#include <uapi/asm/pkey.h>

/*
 * Generate (AES) random secure key.
 * @param cardnr may be -1 (use default card)
 * @param domain may be -1 (use default domain)
 * @param keytype one of the PKEY_KEYTYPE values
 * @param seckey pointer to buffer receiving the secure key
 * @return 0 on success, negative errno value on failure
 */
int pkey_genseckey(__u16 cardnr, __u16 domain,
		   __u32 keytype, struct pkey_seckey *seckey);

/*
 * Generate (AES) secure key with given key value.
 * @param cardnr may be -1 (use default card)
 * @param domain may be -1 (use default domain)
 * @param keytype one of the PKEY_KEYTYPE values
 * @param clrkey pointer to buffer with clear key data
 * @param seckey pointer to buffer receiving the secure key
 * @return 0 on success, negative errno value on failure
 */
int pkey_clr2seckey(__u16 cardnr, __u16 domain, __u32 keytype,
		    const struct pkey_clrkey *clrkey,
		    struct pkey_seckey *seckey);

/*
 * Derive (AES) proteced key from the (AES) secure key blob.
 * @param cardnr may be -1 (use default card)
 * @param domain may be -1 (use default domain)
 * @param seckey pointer to buffer with the input secure key
 * @param protkey pointer to buffer receiving the protected key and
 *	  additional info (type, length)
 * @return 0 on success, negative errno value on failure
 */
int pkey_sec2protkey(__u16 cardnr, __u16 domain,
		     const struct pkey_seckey *seckey,
		     struct pkey_protkey *protkey);

/*
 * Derive (AES) protected key from a given clear key value.
 * @param keytype one of the PKEY_KEYTYPE values
 * @param clrkey pointer to buffer with clear key data
 * @param protkey pointer to buffer receiving the protected key and
 *	  additional info (type, length)
 * @return 0 on success, negative errno value on failure
 */
int pkey_clr2protkey(__u32 keytype,
		     const struct pkey_clrkey *clrkey,
		     struct pkey_protkey *protkey);

/*
 * Search for a matching crypto card based on the Master Key
 * Verification Pattern provided inside a secure key.
 * @param seckey pointer to buffer with the input secure key
 * @param cardnr pointer to cardnr, receives the card number on success
 * @param domain pointer to domain, receives the domain number on success
 * @param verify if set, always verify by fetching verification pattern
 *	  from card
 * @return 0 on success, negative errno value on failure. If no card could be
 *	   found, -ENODEV is returned.
 */
int pkey_findcard(const struct pkey_seckey *seckey,
		  __u16 *cardnr, __u16 *domain, int verify);

/*
 * Find card and transform secure key to protected key.
 * @param seckey pointer to buffer with the input secure key
 * @param protkey pointer to buffer receiving the protected key and
 *	  additional info (type, length)
 * @return 0 on success, negative errno value on failure
 */
int pkey_skey2pkey(const struct pkey_seckey *seckey,
		   struct pkey_protkey *protkey);

/*
 * Verify the given secure key for being able to be useable with
 * the pkey module. Check for correct key type and check for having at
 * least one crypto card being able to handle this key (master key
 * or old master key verification pattern matches).
 * Return some info about the key: keysize in bits, keytype (currently
 * only AES), flag if key is wrapped with an old MKVP.
 * @param seckey pointer to buffer with the input secure key
 * @param pcardnr pointer to cardnr, receives the card number on success
 * @param pdomain pointer to domain, receives the domain number on success
 * @param pkeysize pointer to keysize, receives the bitsize of the key
 * @param pattributes pointer to attributes, receives additional info
 *	  PKEY_VERIFY_ATTR_AES if the key is an AES key
 *	  PKEY_VERIFY_ATTR_OLD_MKVP if key has old mkvp stored in
 * @return 0 on success, negative errno value on failure. If no card could
 *	   be found which is able to handle this key, -ENODEV is returned.
 */
int pkey_verifykey(const struct pkey_seckey *seckey,
		   u16 *pcardnr, u16 *pdomain,
		   u16 *pkeysize, u32 *pattributes);

#endif /* _KAPI_PKEY_H */

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