imx6: Added DEK blob generator command

Freescale's SEC block has built-in Data Encryption
Key(DEK) Blob Protocol which provides a method for
protecting a DEK for non-secure memory storage.
SEC block protects data in a data structure called
a Secret Key Blob, which provides both confidentiality
and integrity protection.
Every time the blob encapsulation is executed,
a AES-256 key is randomly generated to encrypt the DEK.
This key is encrypted with the OTP Secret key
from SoC. The resulting blob consists of the encrypted
AES-256 key, the encrypted DEK, and a 16-bit MAC.

During decapsulation, the reverse process is performed
to get back the original DEK. A caveat to the blob
decapsulation process,  is that the DEK is decrypted
in secure-memory and can only be read by FSL SEC HW.
The DEK is used to decrypt data during encrypted boot.

Commands added
--------------
  dek_blob - encapsulating DEK as a cryptgraphic blob

Commands Syntax
---------------
  dek_blob src dst len

    Encapsulate and create blob of a len-bits DEK at
    address src and store the result at address dst.

Signed-off-by: Raul Cardenas <Ulises.Cardenas@freescale.com>
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>

Signed-off-by: Ulises Cardenas <ulises.cardenas@freescale.com>

Signed-off-by: Ulises Cardenas-B45798 <Ulises.Cardenas@freescale.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/jobdesc.h b/drivers/crypto/fsl/jobdesc.h
index 84b3edd..112404c 100644
--- a/drivers/crypto/fsl/jobdesc.h
+++ b/drivers/crypto/fsl/jobdesc.h
@@ -14,6 +14,20 @@
 
 #define KEY_IDNFR_SZ_BYTES		16
 
+#ifdef CONFIG_CMD_DEKBLOB
+/* inline_cnstr_jobdesc_blob_dek:
+ * Intializes and constructs the job descriptor for DEK encapsulation
+ * using the given parameters.
+ * @desc: reference to the job descriptor
+ * @plain_txt: reference to the DEK
+ * @enc_blob: reference where to store the blob
+ * @in_sz: size in bytes of the DEK
+ * @return: 0 on success, ECONSTRJDESC otherwise
+ */
+int inline_cnstr_jobdesc_blob_dek(uint32_t *desc, const uint8_t *plain_txt,
+				uint8_t *enc_blob, uint32_t in_sz);
+#endif
+
 void inline_cnstr_jobdesc_hash(uint32_t *desc,
 			  const uint8_t *msg, uint32_t msgsz, uint8_t *digest,
 			  u32 alg_type, uint32_t alg_size, int sg_tbl);