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IOTA Kerl:

IOTA is adding an additional hashing function, based on Keccak, with conversion to ternary.

The following document describes the functionality and specification to be implemented.

Kerl integration in IOTA:

Kerl is used in IOTA for the following tasks:

Functionality	Curl-P-27	Curl-P-81	Kerl
Address generation			V^
Signature generation			V
Signature verification			V
Essence calculation (bundleHash)			V
Proof of Work		V
Transaction Hash		V
Milestone verification			V

Curl-P-N: N number of rounds

^ CheckSums are calculated using the last 9 trytes.

Kerl specification:

Kerl Specification: specification and implementation details for kerl

Kerl Test vectors: extensive test vectors for independent implementations

Kerl implementation examples:

Java

JavaScript

Python2

Python3