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s390/pkey: Introduce new API for transforming key blobs

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Introduce a new ioctl API and in-kernel API to transform
a variable length key blob of any supported type into a
protected key.

Transforming a secure key blob uses the already existing
function pkey_sec2protk().
Transforming a protected key blob also verifies if the
protected key is still valid. If not, -ENODEV is returned.

Both APIs are described in detail in the header files
arch/s390/include/asm/pkey.h and arch/s390/include/uapi/asm/pkey.h.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Franzki
2018-08-24 11:29:15 +02:00
committed by Martin Schwidefsky
parent cb26b9ff71
commit fb1136d658
3 changed files with 135 additions and 0 deletions
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10
arch/s390/include/asm/pkey.h
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@@ -125,4 +125,14 @@ int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey);
*/
int pkey_verifyprotkey(const struct pkey_protkey *protkey);
/*
* In-kernel API: Transform an key blob (of any type) into a protected key.
* @param key pointer to a buffer containing the key blob
* @param keylen size of the key blob in bytes
* @param protkey pointer to buffer receiving the protected key
* @return 0 on success, negative errno value on failure
*/
int pkey_keyblob2pkey(const __u8 *key, __u32 keylen,
struct pkey_protkey *protkey);
#endif /* _KAPI_PKEY_H */