Fletcher-64 Checksum

The Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties approaching those of a cyclic redundancy check but with the lower computational effort associated with summation techniques. Fletcher-64 Checksum lives in the Hashing category of the fx menu.

Parameter

Parameter	Type	Required	Default	Description
Input	string	yes	—	Value to transform. Previous step output or a literal.

Input is the primary value (previous step output or a literal).

Returned value

Type	Description
string	Result of the Fletcher-64 Checksum transformation.

Limitations

• This operation treats Input as raw bytes (binary-capable). Non-text payloads may display differently after decoding.
• Wrong key, algorithm options, or malformed input typically raises an evaluation error — fix Input or options before re-running.

Example

Run Fletcher-64 Checksum

The Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. Adjust optional parameters when the defaults do not match your payload.

1. Set Input to the value to transform (previous step output or a literal).

2. Confirm Output value shows the transformed result.