On 12/23/2015 8:04 PM, Christian Huitema wrote:
On Wednesday, December 23, 2015 3:05 PM, Eric Rescorla wrote:
I wonder what the zero length string actually means. Is it a null-terminated
string
that would encode in binary as a one octet byte string of value 0, or an empty
string that would encode in binary as a zero length string?
I see what you mean about the ambiguity here. What I meant was 0 bytes
(i.e., no trailing '\0').
OK, makes sense.
There is one example of encoding a string in section 4.8.1, and the binary
representation
shows the encoding of the final null byte. Is that a common assumption?
No.
Similarly, in the HKDF-Expand-Label, do we assume a final null byte for the
"label"?
No. I wonder if we should instead add the '\0' explicitly in the 4.8.1 for
maximal clarity.
Either that, or just remove the trailing 00 from the binary description.
Or even better. Express the label as a specific sequence of octets as
the normative form for each and every label. That then avoids
questions of the form "C String"? "Ascii"?, "Wide characters"?, etc.
Mike
-- Christian Huitema
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