The Key Wrap approach is used by applications in order to protect keys
located in untrusted storage or transmitted over untrusted
communications networks. The constructions are typically built from
standard primitives such as block ciphers and cryptographic hash
functions.
The Key Wrap method and its parameters are a secret between the keys
provider and the device, means that the device is preconfigured for
this method using very secured way.
The key wrap method may change the key length and layout.
Add a description for the cipher transformation key to allow wrapped key
to be forwarded by the same API.
Add a new feature flag RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY to be enabled
by PMDs support wrapped key in cipher trasformation.
Signed-off-by: Matan Azrad <ma...@nvidia.com>
---
V2:
Address Akhil coment to introduce ne feature flag for wrapped keys.
V3:
Improve descriptions\spelling suggested by Akhil.
doc/guides/cryptodevs/features/default.ini | 1 +
doc/guides/cryptodevs/overview.rst | 3 +++
doc/guides/rel_notes/release_21_05.rst | 5 +++++
lib/librte_cryptodev/rte_crypto_sym.h | 8 ++++++++
lib/librte_cryptodev/rte_cryptodev.c | 2 ++
lib/librte_cryptodev/rte_cryptodev.h | 2 ++
6 files changed, 21 insertions(+)
diff --git a/doc/guides/cryptodevs/features/default.ini
b/doc/guides/cryptodevs/features/default.ini
index 978bb30cc1..c24814de98 100644
--- a/doc/guides/cryptodevs/features/default.ini
+++ b/doc/guides/cryptodevs/features/default.ini
@@ -32,6 +32,7 @@ Symmetric sessionless =
Non-Byte aligned data =
Sym raw data path API =
Cipher multiple data units =
+Cipher wrapped key =
;
; Supported crypto algorithms of a default crypto driver.
diff --git a/doc/guides/cryptodevs/overview.rst
b/doc/guides/cryptodevs/overview.rst
index e24e3e1993..b87c4c6a27 100644
--- a/doc/guides/cryptodevs/overview.rst
+++ b/doc/guides/cryptodevs/overview.rst
@@ -49,6 +49,9 @@ Supported Feature Flags
- "CIPHER_MULTIPLE_DATA_UNITS" feature flag means PMD support operations
on multiple data-units message.
+ - "CIPHER_WRAPPED_KEY" feature flag means PMD support wrapped key in cipher
+ xform.
+
Supported Cipher Algorithms
---------------------------
diff --git a/doc/guides/rel_notes/release_21_05.rst
b/doc/guides/rel_notes/release_21_05.rst
index 1537fac4bc..24b8b28253 100644
--- a/doc/guides/rel_notes/release_21_05.rst
+++ b/doc/guides/rel_notes/release_21_05.rst
@@ -132,6 +132,11 @@ New Features
data-units for AES-XTS algorithm, the data-unit length should be set in the
transformation. A capability for it was added too.
+* **Added a crypto PMD feature flag to support cipher wrapped keys.**
+
+ A new feature flag is added to allow application to provide cipher wrapped
+ keys in session xforms.
+
Removed Items
-------------
diff --git a/lib/librte_cryptodev/rte_crypto_sym.h
b/lib/librte_cryptodev/rte_crypto_sym.h
index 5973e31f30..a1fb5b0f5c 100644
--- a/lib/librte_cryptodev/rte_crypto_sym.h
+++ b/lib/librte_cryptodev/rte_crypto_sym.h
@@ -200,6 +200,14 @@ struct rte_crypto_cipher_xform {
uint16_t length; /**< key length in bytes */
} key;
/**< Cipher key
+ *
+ * In case the PMD supports RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY, the
+ * original key data provided may be wrapped(encrypted) using key wrap
+ * algorithm such as AES key wrap (rfc3394) and hence length of the key
+ * may increase beyond the PMD advertised supported key size.
+ * PMD shall validate the key length and report EMSGSIZE error while
+ * configuring the session and application can skip checking the
+ * capability key length in such cases.
*
* For the RTE_CRYPTO_CIPHER_AES_F8 mode of operation, key.data will
* point to a concatenation of the AES encryption key followed by a
diff --git a/lib/librte_cryptodev/rte_cryptodev.c
b/lib/librte_cryptodev/rte_cryptodev.c
index e02e001325..a84cd745f9 100644
--- a/lib/librte_cryptodev/rte_cryptodev.c
+++ b/lib/librte_cryptodev/rte_cryptodev.c
@@ -619,6 +619,8 @@ rte_cryptodev_get_feature_name(uint64_t flag)
return "NON_BYTE_ALIGNED_DATA";
case RTE_CRYPTODEV_FF_CIPHER_MULTIPLE_DATA_UNITS:
return "CIPHER_MULTIPLE_DATA_UNITS";
+ case RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY:
+ return "CIPHER_WRAPPED_KEY";
default:
return NULL;
}
diff --git a/lib/librte_cryptodev/rte_cryptodev.h
b/lib/librte_cryptodev/rte_cryptodev.h
index c274e208ed..a823831065 100644
--- a/lib/librte_cryptodev/rte_cryptodev.h
+++ b/lib/librte_cryptodev/rte_cryptodev.h
@@ -476,6 +476,8 @@ rte_cryptodev_asym_get_xform_enum(enum
rte_crypto_asym_xform_type *xform_enum,
/**< Support accelerator specific symmetric raw data-path APIs */
#define RTE_CRYPTODEV_FF_CIPHER_MULTIPLE_DATA_UNITS (1ULL << 25)
/**< Support operations on multiple data-units message */
+#define RTE_CRYPTODEV_FF_CIPHER_WRAPPED_KEY (1ULL << 26)
+/**< Support wrapped key in cipher xform */
/**
* Get the name of a crypto device feature flag
--
2.25.1
