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>
diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
index 9923bcb..8b25921 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 @@
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