Package dev.vink.jtotp

Class SecretKeyGenerator

java.lang.Object

dev.vink.jtotp.SecretKeyGenerator

public final class SecretKeyGenerator
extends Object

Utility class for generating secret keys for OTP (One-Time Password) authentication.

This class provides a method to generate a random secret key encoded in Base32 format.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	SHA1_BITS	Number of bits for generate function for SHA1 algorithm
static final int	SHA256_BITS	Number of bits for generate function for SHA256 algorithm
static final int	SHA512_BITS	Number of bits for generate function for SHA512 algorithm

Method Summary

Modifier and Type	Method	Description
static String	generate()	Generates a random secret key with the default bit length (160 bits for HmacSHA1).
static String	generate(int bits)	Generates a random secret key encoded in Base32 format.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SHA1_BITS

public static final int SHA1_BITS

Number of bits for generate function for SHA1 algorithm

See Also:

• Constant Field Values

SHA256_BITS

public static final int SHA256_BITS

Number of bits for generate function for SHA256 algorithm

See Also:

• Constant Field Values

SHA512_BITS

public static final int SHA512_BITS

Number of bits for generate function for SHA512 algorithm

See Also:

• Constant Field Values

Method Details

generate

public static String generate(int bits)

Generates a random secret key encoded in Base32 format.

The generated key is suitable for use in OTP authentication systems.

Parameters:

bits - The bit length of the secret key (e.g., 160, 256, 512).

Returns:

A Base32-encoded secret key string with padding removed.

Throws:

IllegalArgumentException - If the bit length is invalid.

generate

public static String generate()

Generates a random secret key with the default bit length (160 bits for HmacSHA1).

Returns:

A Base32-encoded string representing the secret key.