NIST SP800-108 Key Derivation
PRF
Key
Label
Context
Output Length
Advanced Fixed Input Builder
Default layout matches NIST SP 800-108 counter mode: Counter | Label | 0x00 | Context | [L].
NIST default
Advanced Fixed Input Builder
Default layout matches NIST SP 800-108 counter mode: Counter | Label | 0x00 | Context | [L].
Layout Preset
Counter Bits
Counter Encoding
Separator
The default NIST separator is a single 0x00 byte between Label and Context.
Output Length Segment
[L] is the requested output length encoded in bits. Keep it enabled for the standard construction.
[L] Bits
[L] Encoding
Segment Order
Pick the position for each active segment.Counter
Label
Separator
Context
[L]
Current Sequence
Counter (32-bit Big-endian) -> Label -> Separator (0x00) -> Context -> [L] (32-bit Big-endian)
Derived Key
00148d26a5c85e0d8b993b3d814ed03f
