Merge branch 'protected-key' into features

Harald Freudenberger says:

===================
This patches do some cleanup and reorg of the pkey module code and
extend the existing ioctl with supporting derivation of protected
key material from clear key material for some ECC curves with the
help of the PCKMO instruction.

Please note that 'protected key' is a special type of key only
available on s390. It is similar to an secure key which is encrypted
by a master key sitting inside an HSM. In contrast to secure keys
a protected key is encrypted by a random key located in a hidden
firmware memory accessible by the CPU and thus much faster but
less secure.
===================

The merged updates are:

- Fix the style of protected key API driver source: use
  x-mas tree for all local variable declarations.

- Rework protected key API driver to not use the struct
  pkey_protkey and pkey_clrkey anymore. Both structures
  have a fixed size buffer, but with the support of ECC
  protected key these buffers are not big enough. Use
  dynamic buffers internally and transparently for
  userspace.

- Add support for a new 'non CCA clear key token' with
  ECC clear keys supported: ECC P256, ECC P384, ECC P521,
  ECC ED25519 and ECC ED448. This makes it possible to
  derive a protected key from the ECC clear key input via
  PKEY_KBLOB2PROTK3 ioctl, while currently the only way
  to derive is via PCKMO instruction.
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/crypto/chacha-glue.c

@@ -82,7 +82,7 @@ void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src,
 	 * it cannot handle a block of data or less, but otherwise
 	 * it can handle data of arbitrary size
 	 */
-	if (bytes <= CHACHA_BLOCK_SIZE || nrounds != 20)
+	if (bytes <= CHACHA_BLOCK_SIZE || nrounds != 20 || !MACHINE_HAS_VX)
 		chacha_crypt_generic(state, dst, src, bytes, nrounds);
 	else
 		chacha20_crypt_s390(state, dst, src, bytes,

arch/s390/crypto/paes_s390.c

@@ -5,7 +5,7 @@
  * s390 implementation of the AES Cipher Algorithm with protected keys.
  *
  * s390 Version:
- *   Copyright IBM Corp. 2017,2020
+ *   Copyright IBM Corp. 2017, 2023
  *   Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
  *		Harald Freudenberger <freude@de.ibm.com>
  */
@@ -132,7 +132,8 @@ static inline int __paes_keyblob2pkey(struct key_blob *kb,
 		if (i > 0 && ret == -EAGAIN && in_task())
 			if (msleep_interruptible(1000))
 				return -EINTR;
-		ret = pkey_keyblob2pkey(kb->key, kb->keylen, pk);
+		ret = pkey_keyblob2pkey(kb->key, kb->keylen,
+					pk->protkey, &pk->len, &pk->type);
 		if (ret == 0)
 			break;
 	}
@@ -145,6 +146,7 @@ static inline int __paes_convert_key(struct s390_paes_ctx *ctx)
 	int ret;
 	struct pkey_protkey pkey;
 
+	pkey.len = sizeof(pkey.protkey);
 	ret = __paes_keyblob2pkey(&ctx->kb, &pkey);
 	if (ret)
 		return ret;
@@ -414,6 +416,9 @@ static inline int __xts_paes_convert_key(struct s390_pxts_ctx *ctx)
 {
 	struct pkey_protkey pkey0, pkey1;
 
+	pkey0.len = sizeof(pkey0.protkey);
+	pkey1.len = sizeof(pkey1.protkey);
+
 	if (__paes_keyblob2pkey(&ctx->kb[0], &pkey0) ||
 	    __paes_keyblob2pkey(&ctx->kb[1], &pkey1))
 		return -EINVAL;

arch/s390/include/asm/cpacf.h

@@ -2,7 +2,7 @@
 /*
  * CP Assist for Cryptographic Functions (CPACF)
  *
- * Copyright IBM Corp. 2003, 2017
+ * Copyright IBM Corp. 2003, 2023
  * Author(s): Thomas Spatzier
  *	      Jan Glauber
  *	      Harald Freudenberger (freude@de.ibm.com)
@@ -132,6 +132,11 @@
 #define CPACF_PCKMO_ENC_AES_128_KEY	0x12
 #define CPACF_PCKMO_ENC_AES_192_KEY	0x13
 #define CPACF_PCKMO_ENC_AES_256_KEY	0x14
+#define CPACF_PCKMO_ENC_ECC_P256_KEY	0x20
+#define CPACF_PCKMO_ENC_ECC_P384_KEY	0x21
+#define CPACF_PCKMO_ENC_ECC_P521_KEY	0x22
+#define CPACF_PCKMO_ENC_ECC_ED25519_KEY	0x28
+#define CPACF_PCKMO_ENC_ECC_ED448_KEY	0x29
 
 /*
  * Function codes for the PRNO (PERFORM RANDOM NUMBER OPERATION)

arch/s390/include/asm/pkey.h

@@ -2,7 +2,7 @@
 /*
  * Kernelspace interface to the pkey device driver
  *
- * Copyright IBM Corp. 2016,2019
+ * Copyright IBM Corp. 2016, 2023
  *
  * Author: Harald Freudenberger <freude@de.ibm.com>
  *
@@ -23,6 +23,6 @@
  * @return 0 on success, negative errno value on failure
  */
 int pkey_keyblob2pkey(const u8 *key, u32 keylen,
-		      struct pkey_protkey *protkey);
+		      u8 *protkey, u32 *protkeylen, u32 *protkeytype);
 
 #endif /* _KAPI_PKEY_H */

arch/s390/include/uapi/asm/pkey.h

@@ -2,7 +2,7 @@
 /*
  * Userspace interface to the pkey device driver
  *
- * Copyright IBM Corp. 2017, 2019
+ * Copyright IBM Corp. 2017, 2023
  *
  * Author: Harald Freudenberger <freude@de.ibm.com>
  *
@@ -36,6 +36,11 @@
 #define PKEY_KEYTYPE_AES_192		2
 #define PKEY_KEYTYPE_AES_256		3
 #define PKEY_KEYTYPE_ECC		4
+#define PKEY_KEYTYPE_ECC_P256		5
+#define PKEY_KEYTYPE_ECC_P384		6
+#define PKEY_KEYTYPE_ECC_P521		7
+#define PKEY_KEYTYPE_ECC_ED25519	8
+#define PKEY_KEYTYPE_ECC_ED448		9
 
 /* the newer ioctls use a pkey_key_type enum for type information */
 enum pkey_key_type {