Re: [RFC PATCH 4/4] crypto: Add EC-RDSA algorithm

[David Howells]

Vitaly Chikunov <vt@xxxxxxxxxxxx> wrote:

> > Regarding your comment (2), I am not sure I understand. Why do you say that 
> > the DER format cannot be parsed by the kernel's ASN.1 parser? For example, 
> 
> It can, but DER is stricter than BER. For example, in DER 'OCTET STRING'
> length field should be encoded in just one byte if it's smaller than
> 128, in BER it could be encoded in multiple encodings. This does not
> seem like a big deal, though. With BER decoder an improperly DER-encoded
> certificate could be successfully parsed.

Whilst that is true, I don't think it's that big a deal.  DER is a subset of
BER, so a BER decoder ought to be able to parse it.  Note that X.509 is
supposed to be DER, but we use a BER decoder for that too.

David