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ECDSA署名値の保持方法が不明瞭 #2

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HirokiIshiguro opened this issue Jun 14, 2021 · 0 comments

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HirokiIshiguro commented Jun 14, 2021

現状仕様

mot-file-converter/Renesas Secure Flash Programmer/FormMain.cs

Line 352 in 86a4857

Signature/MAC/Hash size : ファームウェア検証に用いる署名値やMAC値やハッシュ値などのデータサイズです。
ECDSAのrとsを32バイト固定(データ右詰、ゼロ左詰め)としている

課題①

上記仕様が明確ではないので、仕様書に明記する
- https://www.renesas.com/jp/ja/document/apn/renesas-mcu-firmware-update-design-policy?language=ja

課題②

ECDSAのrとsをX509フォーマットで規定し、上記仕様を変更する

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