imx: imx7 Support for Manufacturing Protection

This code was originally developed by Raul Cardenas <raul.casas@nxp.com>
and modified to be applied in U-Boot imx_v2017.03.

More information about the initial submission can be seen
in the link below:
https://lists.denx.de/pipermail/u-boot/2016-February/245273.html

i.MX7D has an a protection feature for Manufacturing process.
This feature uses asymmetric encryption to sign and verify
authenticated software handled between parties. This command
enables the use of such feature.

The private key is unique and generated once per device.
And it is stored in secure memory and only accessible by CAAM.
Therefore, the public key generation and signature functions
are the only functions available for the user.

The manufacturing-protection authentication process can be used to
authenticate the chip to the OEM's server.

Command usage:

Print the public key for the device.
- mfgprot pubk

Generates Signature over given data.
- mfgprot sign <data_address> <data_size>

Signed-off-by: Raul Ulises Cardenas <raul.casas@nxp.com>
Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>

3 files changed, 164 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/Makefile b/drivers/crypto/fsl/Makefile
index fd736cf3bea..12887e5fe56 100644
--- a/drivers/crypto/fsl/Makefile
+++ b/drivers/crypto/fsl/Makefile
@@ -8,3 +8,4 @@ obj-y += sec.o
 obj-$(CONFIG_FSL_CAAM) += jr.o fsl_hash.o jobdesc.o error.o
 obj-$(CONFIG_CMD_BLOB)$(CONFIG_CMD_DEKBLOB) += fsl_blob.o
 obj-$(CONFIG_RSA_FREESCALE_EXP) += fsl_rsa.o
+obj-$(CONFIG_FSL_MFGPROT) += fsl_mfgprot.o
diff --git a/drivers/crypto/fsl/desc.h b/drivers/crypto/fsl/desc.h
index 081bce53cff..ed36482bfaf 100644
--- a/drivers/crypto/fsl/desc.h
+++ b/drivers/crypto/fsl/desc.h
@@ -739,6 +739,7 @@ struct __packed pdb_mp_sign {
 };
 
 #define PDB_MP_CSEL_SHIFT	17
+#define PDB_MP_CSEL_WIDTH	4
 #define PDB_MP_CSEL_P256	0x3 << PDB_MP_CSEL_SHIFT	/* P-256 */
 #define PDB_MP_CSEL_P384	0x4 << PDB_MP_CSEL_SHIFT	/* P-384 */
 #define PDB_MP_CSEL_P521	0x5 << PDB_MP_CSEL_SHIFT	/* P-521 */
diff --git a/drivers/crypto/fsl/fsl_mfgprot.c b/drivers/crypto/fsl/fsl_mfgprot.c
new file mode 100644
index 00000000000..d08b7d153c2
--- /dev/null
+++ b/drivers/crypto/fsl/fsl_mfgprot.c
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2014-2016 Freescale Semiconductor, Inc.
+ * Copyright 2017 NXP
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fsl_sec.h>
+#include <memalign.h>
+#include "desc.h"
+#include "desc_constr.h"
+#include "jobdesc.h"
+#include "jr.h"
+
+/* Size of MFG descriptor */
+#define MFG_PUBK_DSC_WORDS 4
+#define MFG_SIGN_DSC_WORDS 8
+
+static void mfg_build_sign_dsc(u32 *dsc_ptr, const u8 *m, int size,
+			       u8 *dgst, u8 *c, u8 *d)
+{
+	u32 *dsc = dsc_ptr;
+	struct pdb_mp_sign *pdb;
+
+	init_job_desc_pdb(dsc, 0, sizeof(struct pdb_mp_sign));
+
+	pdb = (struct pdb_mp_sign *)desc_pdb(dsc);
+
+	/* Curve */
+	pdb->pdb_hdr = (PDB_MP_CSEL_P256);
+
+	/* Message Pointer */
+	pdb_add_ptr(&pdb->dma_addr_msg, virt_to_phys((void *)m));
+
+	/* mes-resp Pointer */
+	pdb_add_ptr(&pdb->dma_addr_hash, virt_to_phys((void *)dgst));
+
+	/* C Pointer */
+	pdb_add_ptr(&pdb->dma_addr_c_sig, virt_to_phys((void *)c));
+
+	/* d Pointer */
+	pdb_add_ptr(&pdb->dma_addr_d_sig, virt_to_phys((void *)d));
+
+	/* Message Size */
+	pdb->img_size = size;
+
+	/* MP PubK generate key command */
+	append_cmd(dsc, (CMD_OPERATION | OP_TYPE_DECAP_PROTOCOL |
+			 OP_PCLID_MP_SIGN));
+}
+
+static void mfg_build_pubk_dsc(u32 *dsc_ptr, u8 *dst)
+{
+	u32 *dsc = dsc_ptr;
+	struct pdb_mp_pub_k *pdb;
+
+	init_job_desc_pdb(dsc, 0, sizeof(struct pdb_mp_pub_k));
+
+	pdb = (struct pdb_mp_pub_k *)desc_pdb(dsc);
+
+	/* Curve */
+	pdb->pdb_hdr = (PDB_MP_CSEL_P256);
+
+	/* Message Pointer */
+	pdb_add_ptr(&pdb->dma_pkey, virt_to_phys((void *)dst));
+
+	/* MP Sign key command */
+	append_cmd(dsc, (CMD_OPERATION | OP_TYPE_DECAP_PROTOCOL |
+			 OP_PCLID_MP_PUB_KEY));
+}
+
+int gen_mppubk(u8 *dst)
+{
+	int size, ret;
+	u32 *dsc;
+
+	/* Job Descriptor initialization */
+	dsc = memalign(ARCH_DMA_MINALIGN,
+		       sizeof(uint32_t) * MFG_PUBK_DSC_WORDS);
+	if (!dsc) {
+		debug("Not enough memory for descriptor allocation\n");
+		return -ENOMEM;
+	}
+
+	mfg_build_pubk_dsc(dsc, dst);
+
+	size = roundup(sizeof(uint32_t) * MFG_PUBK_DSC_WORDS,
+		       ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)dsc, (unsigned long)dsc + size);
+
+	size = roundup(FSL_CAAM_MP_PUBK_BYTES, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)dst, (unsigned long)dst + size);
+
+	/* Execute Job Descriptor */
+	puts("\nGenerating Manufacturing Protection Public Key\n");
+
+	ret = run_descriptor_jr(dsc);
+	if (ret) {
+		debug("Error in public key generation %d\n", ret);
+		goto err;
+	}
+
+	size = roundup(FSL_CAAM_MP_PUBK_BYTES, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)dst, (unsigned long)dst + size);
+err:
+	free(dsc);
+	return ret;
+}
+
+int sign_mppubk(const u8 *m, int data_size, u8 *dgst, u8 *c, u8 *d)
+{
+	int size, ret;
+	u32 *dsc;
+
+	/* Job Descriptor initialization */
+	dsc = memalign(ARCH_DMA_MINALIGN,
+		       sizeof(uint32_t) * MFG_SIGN_DSC_WORDS);
+	if (!dsc) {
+		debug("Not enough memory for descriptor allocation\n");
+		return -ENOMEM;
+	}
+
+	mfg_build_sign_dsc(dsc, m, data_size, dgst, c, d);
+
+	size = roundup(sizeof(uint32_t) * MFG_SIGN_DSC_WORDS,
+		       ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)dsc, (unsigned long)dsc + size);
+
+	size = roundup(data_size, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)m, (unsigned long)m + size);
+
+	size = roundup(FSL_CAAM_MP_MES_DGST_BYTES, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)dgst, (unsigned long)dgst + size);
+
+	size = roundup(FSL_CAAM_MP_PRVK_BYTES, ARCH_DMA_MINALIGN);
+	flush_dcache_range((unsigned long)c, (unsigned long)c + size);
+	flush_dcache_range((unsigned long)d, (unsigned long)d + size);
+
+	/* Execute Job Descriptor */
+	puts("\nSigning message with Manufacturing Protection Public Key\n");
+
+	ret = run_descriptor_jr(dsc);
+	if (ret) {
+		debug("Error in public key generation %d\n", ret);
+		goto err;
+	}
+
+	size = roundup(FSL_CAAM_MP_MES_DGST_BYTES, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)dgst,
+				(unsigned long)dgst + size);
+
+	size = roundup(FSL_CAAM_MP_PRVK_BYTES, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range((unsigned long)c, (unsigned long)c + size);
+	invalidate_dcache_range((unsigned long)d, (unsigned long)d + size);
+
+err:
+	free(dsc);
+	return ret;
+}