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T8b949e# Reticulum License

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T8b949e# Copyright (c) 2016-2025 Mark Qvist

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Tff7b72import T7ee787hashlib

Tff7b72from T7ee787math Tff7b72import Te6edf3ceil

Tff7b72from T7ee787RNST7ee787.T7ee787Cryptography Tff7b72import Te6edf3HMAC

Tff7b72def Td2a8ffhkdfTb4b4b4(Te6edf3lengthTff7b72=Tff7b72NoneTb4b4b4, Te6edf3derive_fromTff7b72=Tff7b72NoneTb4b4b4, Te6edf3saltTff7b72=Tff7b72NoneTb4b4b4, Te6edf3contextTff7b72=Tff7b72NoneTb4b4b4)Tb4b4b4:

Te6edf3hash_len Tff7b72= T79c0ff32

Tff7b72def Td2a8ffhmac_sha256Tb4b4b4(Te6edf3keyTb4b4b4, Te6edf3dataTb4b4b4)Tb4b4b4:

Tff7b72return Te6edf3HMACTff7b72.Td2a8ffnewTb4b4b4(Te6edf3keyTb4b4b4, Te6edf3dataTb4b4b4)Tff7b72.Td2a8ffdigestTb4b4b4(Tb4b4b4)

Tff7b72if Te6edf3length Tff7b72== Tff7b72None Tff7b72or Te6edf3length Tff7b72< T79c0ff1Tb4b4b4:

Tff7b72raise Tf85149ValueErrorTb4b4b4(Ta5d6ff"Ta5d6ffInvalid output key lengthTa5d6ff"Tb4b4b4)

Tff7b72if Te6edf3derive_from Tff7b72== Tff7b72None Tff7b72or Te6edf3derive_from Tff7b72== Ta5d6ff"Ta5d6ff"Tb4b4b4:

Tff7b72raise Tf85149ValueErrorTb4b4b4(Ta5d6ff"Ta5d6ffCannot derive key from empty input materialTa5d6ff"Tb4b4b4)

Tff7b72if Te6edf3salt Tff7b72== Tff7b72None Tff7b72or Tffa657lenTb4b4b4(Te6edf3saltTb4b4b4) Tff7b72== T79c0ff0Tb4b4b4:

Te6edf3salt Tff7b72= Tffa657bytesTb4b4b4(Tb4b4b4[T79c0ff0Tb4b4b4] Tff7b72* Te6edf3hash_lenTb4b4b4)

Tff7b72if Te6edf3context Tff7b72== Tff7b72NoneTb4b4b4:

Te6edf3context Tff7b72= Ta5d6ffbTa5d6ff"Ta5d6ff"

Te6edf3pseudorandom_key Tff7b72= Te6edf3hmac_sha256Tb4b4b4(Te6edf3saltTb4b4b4, Te6edf3derive_fromTb4b4b4)

Te6edf3block Tff7b72= Ta5d6ffbTa5d6ff"Ta5d6ff"

Te6edf3derived Tff7b72= Ta5d6ffbTa5d6ff"Ta5d6ff"

Tff7b72for Te6edf3i Tff7b72in Tffa657rangeTb4b4b4(Te6edf3ceilTb4b4b4(Te6edf3length Tff7b72/ Te6edf3hash_lenTb4b4b4)Tb4b4b4)Tb4b4b4:

Te6edf3block Tff7b72= Te6edf3hmac_sha256Tb4b4b4(Te6edf3pseudorandom_keyTb4b4b4, Te6edf3block Tff7b72+ Te6edf3context Tff7b72+ Tffa657bytesTb4b4b4(Tb4b4b4[Tb4b4b4(Te6edf3i Tff7b72+ T79c0ff1Tb4b4b4)Tff7b72%Tb4b4b4(T79c0ff0xFFTff7b72+T79c0ff1Tb4b4b4)Tb4b4b4]Tb4b4b4)Tb4b4b4)

Te6edf3derived Tff7b72+Tff7b72= Te6edf3block

Tff7b72return Te6edf3derivedTb4b4b4[Tb4b4b4:Te6edf3lengthTb4b4b4]