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.

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Kerl integration in IOTA:

Kerl is used in IOTA for the following tasks:

Functionality	Curl	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 is used to verify spending from snapshot addresses.

^ CheckSums are calculated using the last 9 trytes.

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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