SECURE BOOT: Add command for validation of images

1. esbc_validate command is meant for validating header and
   signature of images (Boot Script and ESBC uboot client).
   SHA-256 and RSA operations are performed using SEC block in HW.
   This command works on both PBL based and Non PBL based Freescale
   platforms.
   Command usage:
   esbc_validate img_hdr_addr [pub_key_hash]
2. ESBC uboot client can be linux. Additionally, rootfs and device
   tree blob can also be signed.
3. In the event of header or signature failure in validation,
   ITS and ITF bits determine further course of action.
4. In case of soft failure, appropriate error is dumped on console.
5. In case of hard failure, SoC is issued RESET REQUEST after
   dumping error on the console.
6. KEY REVOCATION Feature:
   QorIQ platforms like B4/T4 have support of srk key table and key
   revocation in ISBC code in Silicon.
   The srk key table allows the user to have a key table with multiple
   keys and revoke any key in case of particular key gets compromised.
   In case the ISBC code uses the key revocation and srk key table to
   verify the u-boot code, the subsequent chain of trust should also
   use the same.
6. ISBC KEY EXTENSION Feature:
   This feature allows large number of keys to be used for esbc validation
   of images. A set of public keys is being signed and validated by ISBC
   which can be further used for esbc validation of images.

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

1 files changed, 199 insertions, 0 deletions

diff --git a/include/fsl_validate.h b/include/fsl_validate.h
new file mode 100644
index 0000000000..c4605349a6
--- /dev/null
+++ b/include/fsl_validate.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _FSL_VALIDATE_H_
+#define _FSL_VALIDATE_H_
+
+#include <fsl_sec.h>
+#include <fsl_sec_mon.h>
+#include <command.h>
+#include <linux/types.h>
+
+#define WORD_SIZE 4
+
+/* Minimum and maximum size of RSA signature length in bits */
+#define KEY_SIZE       4096
+#define KEY_SIZE_BYTES (KEY_SIZE/8)
+#define KEY_SIZE_WORDS (KEY_SIZE_BYTES/(WORD_SIZE))
+
+extern struct jobring jr;
+
+#ifdef CONFIG_KEY_REVOCATION
+/* Srk table and key revocation check */
+#define SRK_FLAG	0x01
+#define UNREVOCABLE_KEY	4
+#define ALIGN_REVOC_KEY 3
+#define MAX_KEY_ENTRIES 4
+#endif
+
+/* Barker code size in bytes */
+#define ESBC_BARKER_LEN	4	/* barker code length in ESBC uboot client */
+				/* header */
+
+/* No-error return values */
+#define ESBC_VALID_HDR	0	/* header is valid */
+
+/* Maximum number of SG entries allowed */
+#define MAX_SG_ENTRIES	8
+
+/*
+ * ESBC uboot client header structure.
+ * The struct contain the following fields
+ * barker code
+ * public key offset
+ * pub key length
+ * signature offset
+ * length of the signature
+ * ptr to SG table
+ * no of entries in SG table
+ * esbc ptr
+ * size of esbc
+ * esbc entry point
+ * Scatter gather flag
+ * UID flag
+ * FSL UID
+ * OEM UID
+ * Here, pub key is modulus concatenated with exponent
+ * of equal length
+ */
+struct fsl_secboot_img_hdr {
+	u8 barker[ESBC_BARKER_LEN];	/* barker code */
+	union {
+		u32 pkey;		/* public key offset */
+#ifdef CONFIG_KEY_REVOCATION
+		u32 srk_tbl_off;
+#endif
+	};
+
+	union {
+		u32 key_len;		/* pub key length in bytes */
+#ifdef CONFIG_KEY_REVOCATION
+		struct {
+			u32 srk_table_flag:8;
+			u32 srk_sel:8;
+			u32 num_srk:16;
+		} len_kr;
+#endif
+	};
+
+	u32 psign;		/* signature offset */
+	u32 sign_len;		/* length of the signature in bytes */
+	union {
+		struct fsl_secboot_sg_table *psgtable;	/* ptr to SG table */
+		u8 *pimg;	/* ptr to ESBC client image */
+	};
+	union {
+		u32 sg_entries;	/* no of entries in SG table */
+		u32 img_size;	/* ESBC client image size in bytes */
+	};
+	ulong img_start;		/* ESBC client entry point */
+	u32 sg_flag;		/* Scatter gather flag */
+	u32 uid_flag;
+	u32 fsl_uid_0;
+	u32 oem_uid_0;
+	u32 reserved1[2];
+	u32 fsl_uid_1;
+	u32 oem_uid_1;
+	u32 reserved2[2];
+	u32 ie_flag;
+	u32 ie_key_sel;
+};
+
+#if defined(CONFIG_FSL_ISBC_KEY_EXT)
+struct ie_key_table {
+	u32 key_len;
+	u8 pkey[2 * KEY_SIZE_BYTES];
+};
+
+struct ie_key_info {
+	uint32_t key_revok;
+	uint32_t num_keys;
+	struct ie_key_table ie_key_tbl[32];
+};
+#endif
+
+#ifdef CONFIG_KEY_REVOCATION
+struct srk_table {
+	u32 key_len;
+	u8 pkey[2 * KEY_SIZE_BYTES];
+};
+#endif
+
+/*
+ * SG table.
+ */
+#if defined(CONFIG_FSL_TRUST_ARCH_v1) && defined(CONFIG_FSL_CORENET)
+/*
+ * This struct contains the following fields
+ * length of the segment
+ * source address
+ */
+struct fsl_secboot_sg_table {
+	u32 len;		/* length of the segment in bytes */
+	ulong src_addr;		/* ptr to the data segment */
+};
+#else
+/*
+ * This struct contains the following fields
+ * length of the segment
+ * Destination Target ID
+ * source address
+ * destination address
+ */
+struct fsl_secboot_sg_table {
+	u32 len;
+	u32 trgt_id;
+	ulong src_addr;
+	ulong dst_addr;
+};
+#endif
+
+/*
+ * ESBC private structure.
+ * Private structure used by ESBC to store following fields
+ * ESBC client key
+ * ESBC client key hash
+ * ESBC client Signature
+ * Encoded hash recovered from signature
+ * Encoded hash of ESBC client header plus ESBC client image
+ */
+struct fsl_secboot_img_priv {
+	uint32_t hdr_location;
+	ulong ie_addr;
+	u32 key_len;
+	struct fsl_secboot_img_hdr hdr;
+
+	u8 img_key[2 * KEY_SIZE_BYTES];	/* ESBC client key */
+	u8 img_key_hash[32];	/* ESBC client key hash */
+
+#ifdef CONFIG_KEY_REVOCATION
+	struct srk_table srk_tbl[MAX_KEY_ENTRIES];
+#endif
+	u8 img_sign[KEY_SIZE_BYTES];		/* ESBC client signature */
+
+	u8 img_encoded_hash[KEY_SIZE_BYTES];	/* EM wrt RSA PKCSv1.5  */
+						/* Includes hash recovered after
+						 * signature verification
+						 */
+
+	u8 img_encoded_hash_second[KEY_SIZE_BYTES];/* EM' wrt RSA PKCSv1.5 */
+						/* Includes hash of
+						 * ESBC client header plus
+						 * ESBC client image
+						 */
+
+	struct fsl_secboot_sg_table sgtbl[MAX_SG_ENTRIES];	/* SG table */
+	u32 ehdrloc;		/* ESBC client location */
+};
+
+int fsl_secboot_validate(cmd_tbl_t *cmdtp, int flag, int argc,
+		char * const argv[]);
+int fsl_secboot_blob_encap(cmd_tbl_t *cmdtp, int flag, int argc,
+	char * const argv[]);
+int fsl_secboot_blob_decap(cmd_tbl_t *cmdtp, int flag, int argc,
+	char * const argv[]);
+
+#endif