Comments (2)
I found one first source, which is linked in this stack overflow discussion (std6.pdf). See p. 21 and following in the PDF.
https://crypto.stackexchange.com/questions/67280/formal-description-of-kdf1-and-kdf2
But: it doesn't specify what to do if the input length is 0.
Quote:
A key derivation function is a function KDF(x, l) that takes as input an octet string x and
an integer l >= 0, and outputs an octet string of length l. The string x is of arbitrary length,
although an implementation may define a (very large) maximum length for x and maximum size
for l, and fail if these bounds are exceeded.
from delphiencryptioncompendium.
Further ressearch shows, that the real specification ight be in IEEE P1363, which is a withdrawn standard from IEEE for which the specification is behind a pay wall.
from delphiencryptioncompendium.
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from delphiencryptioncompendium.