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42 lines
1.7 KiB
42 lines
1.7 KiB
8 months ago
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/*
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* (C) Copyright 2015
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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esbc_validate command
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========================================
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1. esbc_validate command is meant for validating header and
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signature of images (Boot Script and ESBC uboot client).
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SHA-256 and RSA operations are performed using SEC block in HW.
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This command works on both PBL based and Non PBL based Freescale
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platforms.
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Command usage:
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esbc_validate img_hdr_addr [pub_key_hash]
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esbc_validate hdr_addr <hash_val>
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Validates signature using RSA verification.
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$hdr_addr Address of header of the image to be validated.
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$hash_val -Optional. It provides Hash of public/srk key to be
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used to verify signature.
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2. ESBC uboot client can be linux. Additionally, rootfs and device
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tree blob can also be signed.
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3. In the event of header or signature failure in validation,
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ITS and ITF bits determine further course of action.
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4. In case of soft failure, appropriate error is dumped on console.
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5. In case of hard failure, SoC is issued RESET REQUEST after
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dumping error on the console.
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6. KEY REVOCATION Feature:
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QorIQ platforms like B4/T4 have support of srk key table and key
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revocation in ISBC code in Silicon.
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The srk key table allows the user to have a key table with multiple
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keys and revoke any key in case of particular key gets compromised.
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In case the ISBC code uses the key revocation and srk key table to
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verify the u-boot code, the subsequent chain of trust should also
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use the same.
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6. ISBC KEY EXTENSION Feature:
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This feature allows large number of keys to be used for esbc validation
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of images. A set of public keys is being signed and validated by ISBC
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which can be further used for esbc validation of images.
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