Generate HOTP

The HMAC-based One-Time Password algorithm (HOTP) is an algorithm that computes a one-time password from a shared secret key and an incrementing counter. It has been adopted as Internet Engineering Task Force standard RFC 4226, is the cornerstone of Initiative For Open Authentication (OAUTH), and is used in a number of two-factor authentication systems. Enter the secret as the input or leave it blank for a random secret to be generated. Generate HOTP lives in the Others category of the fx menu. See HOTP for format details.

Parameters

Parameter	Type	Required	Default	Description
Input	string	yes	—	Value to transform. Previous step output or a literal.
Name	string	no	—	Argument value for this operation.
Key size	number	no	32	Numeric value. Default 32.
Code length	number	no	6	Numeric value. Default 6.
Counter	number	no	0	Numeric value. Default 0.

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

Returned value

Type	Description
string	Result of the Generate HOTP transformation.

Limitations

• This operation treats Input as raw bytes (binary-capable). Non-text payloads may display differently after decoding.

Example

Run Generate HOTP

The HMAC-based One-Time Password algorithm (HOTP) is an algorithm that computes a one-time password from a shared secret key and an incrementing counter. 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. Review Name, Key size, Code length, Counter and keep defaults unless your format requires otherwise.

3. Confirm Output value shows the transformed result.