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>
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 @@
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);
+}