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, 52 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
index 9923bcbfe9..8b25921272 100644
--- a/drivers/crypto/fsl/fsl_blob.c
+++ b/drivers/crypto/fsl/fsl_blob.c
@@ -7,6 +7,8 @@
 
 #include <common.h>
 #include <malloc.h>
+#include <fsl_sec.h>
+#include <asm-generic/errno.h>
 #include "jobdesc.h"
 #include "desc.h"
 #include "jr.h"
@@ -59,3 +61,53 @@ int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
 	free(desc);
 	return ret;
 }
+
+#ifdef CONFIG_CMD_DEKBLOB
+int blob_dek(const u8 *src, u8 *dst, u8 len)
+{
+	int ret, size, i = 0;
+	u32 *desc;
+
+	int out_sz =  WRP_HDR_SIZE + len + KEY_BLOB_SIZE + MAC_SIZE;
+
+	puts("\nEncapsulating provided DEK to form blob\n");
+	desc = memalign(ARCH_DMA_MINALIGN,
+			sizeof(uint32_t) * DEK_BLOB_DESCSIZE);
+	if (!desc) {
+		debug("Not enough memory for descriptor allocation\n");
+		return -ENOMEM;
+	}
+
+	ret = inline_cnstr_jobdesc_blob_dek(desc, src, dst, len);
+	if (ret) {
+		debug("Error in Job Descriptor Construction:  %d\n", ret);
+	} else {
+		size = roundup(sizeof(uint32_t) * DEK_BLOB_DESCSIZE,
+			      ARCH_DMA_MINALIGN);
+		flush_dcache_range((unsigned long)desc,
+				   (unsigned long)desc + size);
+		size = roundup(sizeof(uint8_t) * out_sz, ARCH_DMA_MINALIGN);
+		flush_dcache_range((unsigned long)dst,
+				   (unsigned long)dst + size);
+
+		ret = run_descriptor_jr(desc);
+	}
+
+	if (ret) {
+		debug("Error in Encapsulation %d\n", ret);
+	   goto err;
+	}
+
+	size = roundup(out_sz, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)dst, (unsigned long)dst+size);
+
+	puts("DEK Blob\n");
+	for (i = 0; i < out_sz; i++)
+		printf("%02X", ((uint8_t *)dst)[i]);
+	printf("\n");
+
+err:
+	free(desc);
+	return ret;
+}
+#endif