crypto/fsl: Add command for encapsulating/decapsulating blobs

Freescale's SEC block has built-in Blob Protocol which provides
a method for protecting user-defined data across system power
cycles. SEC block protects data in a data structure called a Blob,
which provides both confidentiality and integrity protection.

Encapsulating data as a blob
Each time that the Blob Protocol is used to protect data, a
different randomly generated key is used to encrypt the data.
This random key is itself encrypted using a key which is derived
from SoC's non volatile secret key and a 16 bit Key identifier.
The resulting encrypted key along with encrypted data is called a blob.
The non volatile secure key is available for use only during secure boot.

During decapsulation, the reverse process is performed to get back
the original data.

Commands added
--------------
    blob enc - encapsulating data as a cryptgraphic blob
    blob dec - decapsulating cryptgraphic blob to get the data

Commands Syntax
---------------
	blob enc src dst len km

	Encapsulate and create blob of data $len bytes long
	at address $src and store the result at address $dst.
	$km is the 16 byte key modifier is also required for
	generation/use as key for cryptographic operation. Key
	modifier should be 16 byte long.

	blob dec src dst len km

	Decapsulate the  blob of data at address $src and
	store result of $len byte at addr $dst.
	$km is the 16 byte key modifier is also required for
	generation/use as key for cryptographic operation. Key
	modifier should be 16 byte long.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
new file mode 100644
index 0000000..bc01075
--- /dev/null
+++ b/drivers/crypto/fsl/fsl_blob.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include "jobdesc.h"
+#include "desc.h"
+#include "jr.h"
+
+int blob_decrypt(u8 *key_mod, u8 *src, u8 *dst, u8 len)
+{
+	int ret, i = 0;
+	u32 *desc;
+
+	printf("\nDecapsulating data to form blob\n");
+	desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
+	if (!desc) {
+		debug("Not enough memory for descriptor allocation\n");
+		return -1;
+	}
+
+	inline_cnstr_jobdesc_blob_decap(desc, key_mod, src, dst, len);
+
+	for (i = 0; i < 14; i++)
+		printf("%x\n", *(desc + i));
+	ret = run_descriptor_jr(desc);
+
+	if (ret)
+		printf("Error in Decapsulation %d\n", ret);
+
+	free(desc);
+	return ret;
+}
+
+int blob_encrypt(u8 *key_mod, u8 *src, u8 *dst, u8 len)
+{
+	int ret, i = 0;
+	u32 *desc;
+
+	printf("\nEncapsulating data to form blob\n");
+	desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
+	if (!desc) {
+		debug("Not enough memory for descriptor allocation\n");
+		return -1;
+	}
+
+	inline_cnstr_jobdesc_blob_encap(desc, key_mod, src, dst, len);
+	for (i = 0; i < 14; i++)
+		printf("%x\n", *(desc + i));
+	ret = run_descriptor_jr(desc);
+
+	if (ret)
+		printf("Error in Encapsulation %d\n", ret);
+
+	free(desc);
+	return ret;
+}