s390/pkey/zcrypt: Support EP11 AES secure keys

Extend the low level ep11 misc functions implementation by
several functions to support EP11 key objects for paes and pkey:
- EP11 AES secure key generation
- EP11 AES secure key generation from given clear key value
- EP11 AES secure key blob check
- findcard function returns list of apqns based on given criterias
- EP11 AES secure key derive to CPACF protected key

Extend the pkey module to be able to generate and handle EP11
secure keys and also use them as base for deriving protected
keys for CPACF usage. These ioctls are extended to support
EP11 keys: PKEY_GENSECK2, PKEY_CLR2SECK2, PKEY_VERIFYKEY2,
PKEY_APQNS4K, PKEY_APQNS4KT, PKEY_KBLOB2PROTK2.

Additionally the 'clear key' token to protected key now uses
an EP11 card if the other ways (via PCKMO, via CCA) fail.

The PAES cipher implementation needed a new upper limit for
the max key size, but is now also working with EP11 keys.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

2 files changed, 46 insertions, 25 deletions

diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index bb9aa86ad4bd..f3caeb17c85b 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -34,7 +34,7 @@
  * and padding is also possible, the limits need to be generous.
  */
 #define PAES_MIN_KEYSIZE 16
-#define PAES_MAX_KEYSIZE 256
+#define PAES_MAX_KEYSIZE 320
 
 static u8 *ctrblk;
 static DEFINE_MUTEX(ctrblk_lock);
diff --git a/arch/s390/include/uapi/asm/pkey.h b/arch/s390/include/uapi/asm/pkey.h
index e22f0720bbb8..d27d7d329263 100644
--- a/arch/s390/include/uapi/asm/pkey.h
+++ b/arch/s390/include/uapi/asm/pkey.h
@@ -25,10 +25,11 @@
 #define MAXPROTKEYSIZE	64	/* a protected key blob may be up to 64 bytes */
 #define MAXCLRKEYSIZE	32	   /* a clear key value may be up to 32 bytes */
 #define MAXAESCIPHERKEYSIZE 136  /* our aes cipher keys have always 136 bytes */
+#define MINEP11AESKEYBLOBSIZE 256  /* min EP11 AES key blob size  */
+#define MAXEP11AESKEYBLOBSIZE 320  /* max EP11 AES key blob size */
 
-/* Minimum and maximum size of a key blob */
+/* Minimum size of a key blob */
 #define MINKEYBLOBSIZE	SECKEYBLOBSIZE
-#define MAXKEYBLOBSIZE	MAXAESCIPHERKEYSIZE
 
 /* defines for the type field within the pkey_protkey struct */
 #define PKEY_KEYTYPE_AES_128		      1
@@ -39,6 +40,7 @@
 enum pkey_key_type {
 	PKEY_TYPE_CCA_DATA   = (__u32) 1,
 	PKEY_TYPE_CCA_CIPHER = (__u32) 2,
+	PKEY_TYPE_EP11	     = (__u32) 3,
 };
 
 /* the newer ioctls use a pkey_key_size enum for key size information */
@@ -200,7 +202,7 @@ struct pkey_kblob2pkey {
 
 /*
  * Generate secure key, version 2.
- * Generate either a CCA AES secure key or a CCA AES cipher key.
+ * Generate CCA AES secure key, CCA AES cipher key or EP11 AES secure key.
  * There needs to be a list of apqns given with at least one entry in there.
  * All apqns in the list need to be exact apqns, 0xFFFF as ANY card or domain
  * is not supported. The implementation walks through the list of apqns and
@@ -210,10 +212,13 @@ struct pkey_kblob2pkey {
  * (return -1 with errno ENODEV). You may use the PKEY_APQNS4KT ioctl to
  * generate a list of apqns based on the key type to generate.
  * The keygenflags argument is passed to the low level generation functions
- * individual for the key type and has a key type specific meaning. Currently
- * only CCA AES cipher keys react to this parameter: Use one or more of the
- * PKEY_KEYGEN_* flags to widen the export possibilities. By default a cipher
- * key is only exportable for CPACF (PKEY_KEYGEN_XPRT_CPAC).
+ * individual for the key type and has a key type specific meaning. When
+ * generating CCA cipher keys you can use one or more of the PKEY_KEYGEN_*
+ * flags to widen the export possibilities. By default a cipher key is
+ * only exportable for CPACF (PKEY_KEYGEN_XPRT_CPAC).
+ * The keygenflag argument for generating an EP11 AES key should either be 0
+ * to use the defaults which are XCP_BLOB_ENCRYPT, XCP_BLOB_DECRYPT and
+ * XCP_BLOB_PROTKEY_EXTRACTABLE or a valid combination of XCP_BLOB_* flags.
  */
 struct pkey_genseck2 {
 	struct pkey_apqn __user *apqns; /* in: ptr to list of apqn targets*/
@@ -229,8 +234,8 @@ struct pkey_genseck2 {
 
 /*
  * Generate secure key from clear key value, version 2.
- * Construct a CCA AES secure key or CCA AES cipher key from a given clear key
- * value.
+ * Construct an CCA AES secure key, CCA AES cipher key or EP11 AES secure
+ * key from a given clear key value.
  * There needs to be a list of apqns given with at least one entry in there.
  * All apqns in the list need to be exact apqns, 0xFFFF as ANY card or domain
  * is not supported. The implementation walks through the list of apqns and
@@ -240,10 +245,13 @@ struct pkey_genseck2 {
  * (return -1 with errno ENODEV). You may use the PKEY_APQNS4KT ioctl to
  * generate a list of apqns based on the key type to generate.
  * The keygenflags argument is passed to the low level generation functions
- * individual for the key type and has a key type specific meaning. Currently
- * only CCA AES cipher keys react to this parameter: Use one or more of the
- * PKEY_KEYGEN_* flags to widen the export possibilities. By default a cipher
- * key is only exportable for CPACF (PKEY_KEYGEN_XPRT_CPAC).
+ * individual for the key type and has a key type specific meaning. When
+ * generating CCA cipher keys you can use one or more of the PKEY_KEYGEN_*
+ * flags to widen the export possibilities. By default a cipher key is
+ * only exportable for CPACF (PKEY_KEYGEN_XPRT_CPAC).
+ * The keygenflag argument for generating an EP11 AES key should either be 0
+ * to use the defaults which are XCP_BLOB_ENCRYPT, XCP_BLOB_DECRYPT and
+ * XCP_BLOB_PROTKEY_EXTRACTABLE or a valid combination of XCP_BLOB_* flags.
  */
 struct pkey_clr2seck2 {
 	struct pkey_apqn __user *apqns; /* in: ptr to list of apqn targets */
@@ -266,14 +274,19 @@ struct pkey_clr2seck2 {
  * with one apqn able to handle this key.
  * The function also checks for the master key verification patterns
  * of the key matching to the current or alternate mkvp of the apqn.
- * Currently CCA AES secure keys and CCA AES cipher keys are supported.
- * The flags field is updated with some additional info about the apqn mkvp
+ * For CCA AES secure keys and CCA AES cipher keys this means to check
+ * the key's mkvp against the current or old mkvp of the apqns. The flags
+ * field is updated with some additional info about the apqn mkvp
  * match: If the current mkvp matches to the key's mkvp then the
  * PKEY_FLAGS_MATCH_CUR_MKVP bit is set, if the alternate mkvp matches to
  * the key's mkvp the PKEY_FLAGS_MATCH_ALT_MKVP is set. For CCA keys the
  * alternate mkvp is the old master key verification pattern.
  * CCA AES secure keys are also checked to have the CPACF export allowed
  * bit enabled (XPRTCPAC) in the kmf1 field.
+ * EP11 keys are also supported and the wkvp of the key is checked against
+ * the current wkvp of the apqns. There is no alternate for this type of
+ * key and so on a match the flag PKEY_FLAGS_MATCH_CUR_MKVP always is set.
+ * EP11 keys are also checked to have XCP_BLOB_PROTKEY_EXTRACTABLE set.
  * The ioctl returns 0 as long as the given or found apqn matches to
  * matches with the current or alternate mkvp to the key's mkvp. If the given
  * apqn does not match or there is no such apqn found, -1 with errno
@@ -313,16 +326,20 @@ struct pkey_kblob2pkey2 {
 /*
  * Build a list of APQNs based on a key blob given.
  * Is able to find out which type of secure key is given (CCA AES secure
- * key or CCA AES cipher key) and tries to find all matching crypto cards
- * based on the MKVP and maybe other criterias (like CCA AES cipher keys
- * need a CEX5C or higher). The list of APQNs is further filtered by the key's
- * mkvp which needs to match to either the current mkvp or the alternate mkvp
- * (which is the old mkvp on CCA adapters) of the apqns. The flags argument may
- * be used to limit the matching apqns. If the PKEY_FLAGS_MATCH_CUR_MKVP is
- * given, only the current mkvp of each apqn is compared. Likewise with the
- * PKEY_FLAGS_MATCH_ALT_MKVP. If both are given, it is assumed to
- * return apqns where either the current or the alternate mkvp
+ * key, CCA AES cipher key or EP11 AES key) and tries to find all matching
+ * crypto cards based on the MKVP and maybe other criterias (like CCA AES
+ * cipher keys need a CEX5C or higher, EP11 keys with BLOB_PKEY_EXTRACTABLE
+ * need a CEX7 and EP11 api version 4). The list of APQNs is further filtered
+ * by the key's mkvp which needs to match to either the current mkvp (CCA and
+ * EP11) or the alternate mkvp (old mkvp, CCA adapters only) of the apqns. The
+ * flags argument may be used to limit the matching apqns. If the
+ * PKEY_FLAGS_MATCH_CUR_MKVP is given, only the current mkvp of each apqn is
+ * compared. Likewise with the PKEY_FLAGS_MATCH_ALT_MKVP. If both are given, it
+ * is assumed to return apqns where either the current or the alternate mkvp
  * matches. At least one of the matching flags needs to be given.
+ * The flags argument for EP11 keys has no further action and is currently
+ * ignored (but needs to be given as PKEY_FLAGS_MATCH_CUR_MKVP) as there is only
+ * the wkvp from the key to match against the apqn's wkvp.
  * The list of matching apqns is stored into the space given by the apqns
  * argument and the number of stored entries goes into apqn_entries. If the list
  * is empty (apqn_entries is 0) the apqn_entries field is updated to the number
@@ -356,6 +373,10 @@ struct pkey_apqns4key {
  * If both are given, it is assumed to return apqns where either the
  * current or the alternate mkvp matches. If no match flag is given
  * (flags is 0) the mkvp values are ignored for the match process.
+ * For EP11 keys there is only the current wkvp. So if the apqns should also
+ * match to a given wkvp, then the PKEY_FLAGS_MATCH_CUR_MKVP flag should be
+ * set. The wkvp value is 32 bytes but only the leftmost 16 bytes are compared
+ * against the leftmost 16 byte of the wkvp of the apqn.
  * The list of matching apqns is stored into the space given by the apqns
  * argument and the number of stored entries goes into apqn_entries. If the list
  * is empty (apqn_entries is 0) the apqn_entries field is updated to the number