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, 80 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c
index cbe5c30..1386bae 100644
--- a/drivers/crypto/fsl/jobdesc.c
+++ b/drivers/crypto/fsl/jobdesc.c
@@ -12,6 +12,9 @@
 #include "desc_constr.h"
 #include "jobdesc.h"
 
+#define KEY_BLOB_SIZE			32
+#define MAC_SIZE			16
+
 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)
@@ -43,3 +46,80 @@ void inline_cnstr_jobdesc_hash(uint32_t *desc,
 	append_store(desc, dma_addr_out, storelen,
 		     LDST_CLASS_2_CCB | LDST_SRCDST_BYTE_CONTEXT);
 }
+
+void inline_cnstr_jobdesc_blob_encap(uint32_t *desc, uint8_t *key_idnfr,
+				     uint8_t *plain_txt, uint8_t *enc_blob,
+				     uint32_t in_sz)
+{
+	dma_addr_t dma_addr_key_idnfr, dma_addr_in, dma_addr_out;
+	uint32_t key_sz = KEY_IDNFR_SZ_BYTES;
+	/* output blob will have 32 bytes key blob in beginning and
+	 * 16 byte HMAC identifier at end of data blob */
+	uint32_t out_sz = in_sz + KEY_BLOB_SIZE + MAC_SIZE;
+
+	dma_addr_key_idnfr = virt_to_phys((void *)key_idnfr);
+	dma_addr_in	= virt_to_phys((void *)plain_txt);
+	dma_addr_out	= virt_to_phys((void *)enc_blob);
+
+	init_job_desc(desc, 0);
+
+	append_key(desc, dma_addr_key_idnfr, key_sz, CLASS_2);
+
+	append_seq_in_ptr(desc, dma_addr_in, in_sz, 0);
+
+	append_seq_out_ptr(desc, dma_addr_out, out_sz, 0);
+
+	append_operation(desc, OP_TYPE_ENCAP_PROTOCOL | OP_PCLID_BLOB);
+}
+
+void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
+				     uint8_t *enc_blob, uint8_t *plain_txt,
+				     uint32_t out_sz)
+{
+	dma_addr_t dma_addr_key_idnfr, dma_addr_in, dma_addr_out;
+	uint32_t key_sz = KEY_IDNFR_SZ_BYTES;
+	uint32_t in_sz = out_sz + KEY_BLOB_SIZE + MAC_SIZE;
+
+	dma_addr_key_idnfr = virt_to_phys((void *)key_idnfr);
+	dma_addr_in	= virt_to_phys((void *)enc_blob);
+	dma_addr_out	= virt_to_phys((void *)plain_txt);
+
+	init_job_desc(desc, 0);
+
+	append_key(desc, dma_addr_key_idnfr, key_sz, CLASS_2);
+
+	append_seq_in_ptr(desc, dma_addr_in, in_sz, 0);
+
+	append_seq_out_ptr(desc, dma_addr_out, out_sz, 0);
+
+	append_operation(desc, OP_TYPE_DECAP_PROTOCOL | OP_PCLID_BLOB);
+}
+
+/*
+ * Descriptor to instantiate RNG State Handle 0 in normal mode and
+ * load the JDKEK, TDKEK and TDSK registers
+ */
+void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc)
+{
+	u32 *jump_cmd;
+
+	init_job_desc(desc, 0);
+
+	/* INIT RNG in non-test mode */
+	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
+			 OP_ALG_AS_INIT);
+
+	/* wait for done */
+	jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
+	set_jump_tgt_here(desc, jump_cmd);
+
+	/*
+	 * load 1 to clear written reg:
+	 * resets the done interrrupt and returns the RNG to idle.
+	 */
+	append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
+
+	/* generate secure keys (non-test) */
+	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
+			 OP_ALG_RNG4_SK);
+}