[PATCH v4 02/16] crypto/fsl: Add CAAM support for bkek, random number generation

Gaurav Jain gaurav.jain at nxp.com
Tue Oct 26 08:55:40 CEST 2021


added api and descriptor for blob key encryption key(bkek) generation.
added api for random number generation.

Signed-off-by: Gaurav Jain <gaurav.jain at nxp.com>
Signed-off-by: Ji Luo <ji.luo at nxp.com>
Reviewed-by: Ye Li <ye.li at nxp.com>
---
 drivers/crypto/fsl/desc.h     |  5 +++
 drivers/crypto/fsl/fsl_blob.c | 82 +++++++++++++++++++++++++++++++++++
 drivers/crypto/fsl/jobdesc.c  | 20 +++++++--
 drivers/crypto/fsl/jobdesc.h  |  4 ++
 4 files changed, 108 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/fsl/desc.h b/drivers/crypto/fsl/desc.h
index 5705c4f944..5958ebd3ac 100644
--- a/drivers/crypto/fsl/desc.h
+++ b/drivers/crypto/fsl/desc.h
@@ -4,6 +4,7 @@
  * Definitions to support CAAM descriptor instruction generation
  *
  * Copyright 2008-2014 Freescale Semiconductor, Inc.
+ * Copyright 2021 NXP
  *
  * Based on desc.h file in linux drivers/crypto/caam
  */
@@ -15,6 +16,7 @@
 
 #define KEY_BLOB_SIZE		32
 #define MAC_SIZE			16
+#define BKEK_SIZE		32
 
 /* Max size of any CAAM descriptor in 32-bit words, inclusive of header */
 #define MAX_CAAM_DESCSIZE	64
@@ -463,6 +465,9 @@
 #define OP_PROTINFO_HASH_SHA384	0x00000200
 #define OP_PROTINFO_HASH_SHA512	0x00000280
 
+/* PROTINFO fields for Blob Operations */
+#define OP_PROTINFO_MKVB	0x00000002
+
 /* For non-protocol/alg-only op commands */
 #define OP_ALG_TYPE_SHIFT	24
 #define OP_ALG_TYPE_MASK	(0x7 << OP_ALG_TYPE_SHIFT)
diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
index e8202cc569..e8bc009daf 100644
--- a/drivers/crypto/fsl/fsl_blob.c
+++ b/drivers/crypto/fsl/fsl_blob.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
+ * Copyright 2021 NXP
  *
  */
 
@@ -152,6 +153,87 @@ int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
 	return ret;
 }
 
+int derive_blob_kek(u8 *bkek_buf, u8 *key_mod, u32 key_sz)
+{
+	int ret, size;
+	u32 *desc;
+
+	if (!IS_ALIGNED((uintptr_t)bkek_buf, ARCH_DMA_MINALIGN) ||
+	    !IS_ALIGNED((uintptr_t)key_mod, ARCH_DMA_MINALIGN)) {
+		puts("Error: derive_bkek: Address arguments are not aligned!\n");
+		return -EINVAL;
+	}
+
+	printf("\nBlob key encryption key(bkek)\n");
+	desc = malloc_cache_aligned(sizeof(int) * MAX_CAAM_DESCSIZE);
+	if (!desc) {
+		printf("Not enough memory for descriptor allocation\n");
+		return -ENOMEM;
+	}
+
+	size = ALIGN(key_sz, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)key_mod, (unsigned long)key_mod + size);
+
+	/* construct blob key encryption key(bkek) derive descriptor */
+	inline_cnstr_jobdesc_derive_bkek(desc, bkek_buf, key_mod, key_sz);
+
+	size = ALIGN(sizeof(int) * MAX_CAAM_DESCSIZE, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)desc, (unsigned long)desc + size);
+	size = ALIGN(BKEK_SIZE, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)bkek_buf,
+				(unsigned long)bkek_buf + size);
+
+	/* run descriptor */
+	ret = run_descriptor_jr(desc);
+	if (ret < 0) {
+		printf("Error: %s failed 0x%x\n", __func__, ret);
+	} else {
+		invalidate_dcache_range((unsigned long)bkek_buf,
+					(unsigned long)bkek_buf + size);
+		puts("derive bkek successful.\n");
+	}
+
+	free(desc);
+	return ret;
+}
+
+int hwrng_generate(u8 *dst, u32 len)
+{
+	int ret, size;
+	u32 *desc;
+
+	if (!IS_ALIGNED((uintptr_t)dst, ARCH_DMA_MINALIGN)) {
+		puts("Error: caam_hwrng_test: Address arguments are not aligned!\n");
+		return -EINVAL;
+	}
+
+	printf("\nRNG generate\n");
+	desc = malloc_cache_aligned(sizeof(int) * MAX_CAAM_DESCSIZE);
+	if (!desc) {
+		printf("Not enough memory for descriptor allocation\n");
+		return -ENOMEM;
+	}
+
+	inline_cnstr_jobdesc_rng(desc, dst, len);
+
+	size = ALIGN(sizeof(int) * MAX_CAAM_DESCSIZE, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)desc, (unsigned long)desc + size);
+	size = ALIGN(len, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)dst, (unsigned long)dst + size);
+
+	ret = run_descriptor_jr(desc);
+	if (ret < 0) {
+		printf("Error: RNG generate failed 0x%x\n", ret);
+	} else {
+		invalidate_dcache_range((unsigned long)dst,
+					(unsigned long)dst + size);
+		puts("RNG generation successful.\n");
+	}
+
+	free(desc);
+	return ret;
+}
+
 #ifdef CONFIG_CMD_DEKBLOB
 int blob_dek(const u8 *src, u8 *dst, u8 len)
 {
diff --git a/drivers/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c
index c350b32856..d58937c284 100644
--- a/drivers/crypto/fsl/jobdesc.c
+++ b/drivers/crypto/fsl/jobdesc.c
@@ -4,7 +4,7 @@
  * Basic job descriptor construction
  *
  * Copyright 2014 Freescale Semiconductor, Inc.
- * Copyright 2018 NXP
+ * Copyright 2018, 2021 NXP
  *
  */
 
@@ -207,7 +207,7 @@ void inline_cnstr_jobdesc_hash(uint32_t *desc,
 	append_store(desc, dma_addr_out, storelen,
 		     LDST_CLASS_2_CCB | LDST_SRCDST_BYTE_CONTEXT);
 }
-#ifndef CONFIG_SPL_BUILD
+
 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)
@@ -255,7 +255,7 @@ void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
 
 	append_operation(desc, OP_TYPE_DECAP_PROTOCOL | OP_PCLID_BLOB);
 }
-#endif
+
 /*
  * Descriptor to instantiate RNG State Handle 0 in normal mode and
  * load the JDKEK, TDKEK and TDSK registers
@@ -334,3 +334,17 @@ void inline_cnstr_jobdesc_pkha_rsaexp(uint32_t *desc,
 	append_fifo_store(desc, dma_addr_out, out_siz,
 			  LDST_CLASS_1_CCB | FIFOST_TYPE_PKHA_B);
 }
+
+void inline_cnstr_jobdesc_derive_bkek(uint32_t *desc, void *bkek_out,
+				      void *key_mod, uint32_t key_sz)
+{
+	dma_addr_t dma_key_mod = virt_to_phys(key_mod);
+	dma_addr_t dma_bkek_out = virt_to_phys(bkek_out);
+
+	init_job_desc(desc, 0);
+	append_load(desc, dma_key_mod, key_sz,	LDST_CLASS_2_CCB |
+						LDST_SRCDST_BYTE_KEY);
+	append_seq_out_ptr_intlen(desc, dma_bkek_out, BKEK_SIZE, 0);
+	append_operation(desc, OP_TYPE_ENCAP_PROTOCOL | OP_PCLID_BLOB |
+							OP_PROTINFO_MKVB);
+}
diff --git a/drivers/crypto/fsl/jobdesc.h b/drivers/crypto/fsl/jobdesc.h
index c4501abd26..a720d68e82 100644
--- a/drivers/crypto/fsl/jobdesc.h
+++ b/drivers/crypto/fsl/jobdesc.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
+ * Copyright 2021 NXP
  *
  */
 
@@ -49,4 +50,7 @@ void inline_cnstr_jobdesc_pkha_rsaexp(uint32_t *desc,
 				      struct pk_in_params *pkin, uint8_t *out,
 				      uint32_t out_siz);
 
+void inline_cnstr_jobdesc_derive_bkek(uint32_t *desc, void *bkek_out,
+				      void *key_mod, uint32_t key_sz);
+
 #endif
-- 
2.17.1



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