Documentation

Cryptlib.Protocols.Sphinx.surb

Single-use reply blocks (SURB) #

The SURB operations shared by NIKE- and KEM-Sphinx.

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def Cryptlib.Protocols.Sphinx.SURB.decryptSURBPayload (cipher : Primitives.WideBlockCipher.WideBlockCipher) (geom : Geometry.Geometry) (keys payload : ByteArray) :
Except String ByteArray

Decrypt a SURB reply payload. keys holds nrHops (key[48] ++ iv[16]) chunks in reverse hop order; all but the last encrypt, the last decrypts.

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    def Cryptlib.Protocols.Sphinx.SURB.newPacketFromSURB (cipher : Primitives.WideBlockCipher.WideBlockCipher) (geom : Geometry.Geometry) (surb payload : ByteArray) :
    Except String (ByteArray × Vector UInt8 32)

    Build a reply packet from a SURB and a payload. surb is header ‖ firstHopID(32) ‖ sprpKey(48) ‖ sprpIV(16). Returns (packet, firstHopID).

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