lthn

func GetKeyMap ¶

func GetKeyMap() map[rune]rune

GetKeyMap returns the current character substitution map.

func Hash ¶

func Hash(input string) string

Hash computes the LTHN hash of the input string.

The algorithm:

1. Derive a quasi-salt by reversing the input and applying character substitutions
2. Concatenate: input + salt
3. Compute SHA-256 of the concatenated string
4. Return the hex-encoded digest (64 characters, lowercase)

The same input always produces the same hash, enabling verification without storing a separate salt value.

func SetKeyMap ¶

func SetKeyMap(newKeyMap map[rune]rune)

SetKeyMap replaces the default character substitution map. Use this to customize the quasi-salt derivation for specific applications. Changes affect all subsequent Hash and Verify calls.

func Verify ¶

func Verify(input string, hash string) bool

Verify checks if an input string produces the given hash. Returns true if Hash(input) equals the provided hash value. Uses direct string comparison - for security-critical applications, consider using constant-time comparison.