On 6 July 2017 at 12:19, Kazu Yamamoto <k...@iij.ad.jp> wrote:
> The definitions would be:
>
> HKDF-Expand-Label(Secret, Label, *Value*, Length) =
> HKDF-Expand(Secret, HkdfLabel, Length)
>
> struct {
> uint16 length = *Value.length*;
> opaque label<7..255> = "tls13 " + Label;
> opaque hash_value<0..255> = *Value*;
> } HkdfLabel;
Length is the size of the output, so you don't want to assign
Value.length to that field in the struct. Also, you forgot to rename
hash_value in the struct.
The name "context" strikes me as a good choice here. It shares a neat
parallel with the name used in exporters. But I trust that ekr will
find a reasonable way of solving this.
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