ASN.1 Decoding bypass that allows to reduce size of flash when ED25519 is used #347
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nvlsianpu
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nordicjm
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@de-nordic Needs rebase |
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…ey import The commit adds MCUBOOT_KEY_IMPORT_BYPASS_ASN configuration option that allows bypassing ASN.1 decoding of ED25519 public key, compiled into MCUboot. When the option is enabled the key will be accessed directly and ASN.1 processing is not compiled in, resulting in smaller footprint of MCUboot, at a cost of reduced detection of invalid key, i.e. public key designated for different method than compiled in. (cherry picked from commit 1dcfbda) Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
…SS_ASN The option enables MCUboot configuration option MCUBOOT_KEY_IMPORT_BYPASS_ASN. (cherry picked from commit 3ff7549) Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
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Superseded by #401 |
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The PR adds options that allow to remove run-time ASN.1 decoding of ED25519 public key embedded in MCUboot build, which in turn reduces flash size used by MCUboot.
When building nrf52840dk Hello world:
We get 41898 bytes of flash for MCUboot without bypass and 41386 when
-Dmcuboot_CONFIG_BOOT_KEY_IMPORT_BYPASS_ASN=yis added to command line.