A PKCE code verifier + its S256 challenge. The verifier is high-entropy (32 random bytes → 43-char base64url string, within the RFC's 43–128 range); the challenge is BASE64URL(SHA-256(verifier)).
BASE64URL(SHA-256(verifier))
A PKCE code verifier + its S256 challenge. The verifier is high-entropy (32 random bytes → 43-char base64url string, within the RFC's 43–128 range); the challenge is
BASE64URL(SHA-256(verifier)).