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https://github.com/brain-hackers/u-boot-brain
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da29f2991d
Padding verification was done against static SHA/RSA pair arrays which take up a lot of static memory, are mostly 0xff, and cannot be reused for additional SHA/RSA pairings. The padding can be easily computed according to PKCS#1v2.1 as: EM = 0x00 || 0x01 || PS || 0x00 || T where PS is (emLen - tLen - 3) octets of 0xff and T is DER encoding of the hash. Store DER prefix in checksum_algo and create rsa_verify_padding function to handle verification of a message for any SHA/RSA pairing. Signed-off-by: Andrew Duda <aduda@meraki.com> Signed-off-by: aduda <aduda@meraki.com> Reviewed-by: Simon Glass <sjg@chromium.org>
30 lines
702 B
C
30 lines
702 B
C
/*
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* Copyright (c) 2013, Andreas Oetken.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _RSA_CHECKSUM_H
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#define _RSA_CHECKSUM_H
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#include <errno.h>
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#include <image.h>
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#include <u-boot/sha1.h>
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#include <u-boot/sha256.h>
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/**
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* hash_calculate() - Calculate hash over the data
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*
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* @name: Name of algorithm to be used for hash calculation
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* @region: Array having info of regions over which hash needs to be calculated
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* @region_count: Number of regions in the region array
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* @checksum: Buffer contanining the output hash
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*
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* @return 0 if OK, < 0 if error
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*/
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int hash_calculate(const char *name,
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const struct image_region region[], int region_count,
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uint8_t *checksum);
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#endif
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