Messages in this thread | | | Subject | Re: [PATCH v2][RESEND] X.509: unpack RSA signatureValue field from BIT STRING | From | "Maciej S. Szmigiero" <> | Date | Sat, 2 Jun 2018 21:12:00 +0200 |
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On 19.05.2018 14:23, Maciej S. Szmigiero wrote: > The signatureValue field of a X.509 certificate is encoded as a BIT STRING. > For RSA signatures this BIT STRING is of so-called primitive subtype, which > contains a u8 prefix indicating a count of unused bits in the encoding. > > We have to strip this prefix from signature data, just as we already do for > key data in x509_extract_key_data() function. > > This wasn't noticed earlier because this prefix byte is zero for RSA key > sizes divisible by 8. Since BIT STRING is a big-endian encoding adding zero > prefixes has no bearing on its value. > > The signature length, however was incorrect, which is a problem for RSA > implementations that need it to be exactly correct (like AMD CCP).
Any progress here? This simple patch has already been submitted 3 times in last 3+ months...
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