Struct CodeVerifier 

pub struct CodeVerifier(/* private fields */);

A PKCE code verifier (RFC 7636 §4.1).

The verifier is a cryptographically-random string of 43-128 unreserved ASCII characters. We generate 32 random bytes and base64url-encode them (no padding) to produce exactly 43 characters, satisfying the minimum.

Implementations

impl CodeVerifier

pub fn new() -> Self

Generate a new cryptographically-random code verifier.

Uses rand::OsRng (CSPRNG) for entropy per RFC 7636 §4.1.

pub fn as_str(&self) -> &str

Return the verifier as a string slice.

pub fn from_string(s: impl Into<String>) -> Result<Self, AuthError>

Validate and construct a verifier from an existing string (e.g. received from client).

Accepts only unreserved ASCII characters per RFC 7636 §4.1: A-Z a-z 0-9 - . _ ~

pub fn to_challenge(&self) -> CodeChallenge

Derive the S256 code challenge for this verifier.

BASE64URL(SHA-256(ASCII(code_verifier))) per RFC 7636 §4.6.

Trait Implementations

impl Clone for CodeVerifier

fn clone(&self) -> CodeVerifier

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CodeVerifier

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CodeVerifier

fn default() -> Self

Returns the “default value” for a type.