Hi Avinash,
The paragraph you mentioned is little bit vague,
better look at 6.2.3.1 from the same RFC; below is a
fragment from 6.2.3.1 paragraph:
..................
The MAC is generated as:
HMAC_hash(MAC_write_secret, seq_num +
TLSCompressed.type +
TLSCompressed.version +
TLSCompressed.length +
TLSCompressed.fragment));
where "+" denotes concatenation.
.....................
The "two fixed character strings" are 'type' and
'version'; I implemented it (in C++) just as specified
above and it works.
Dragos.
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