hLenaffects
hLenaffects refers to the impact of the hash length, hLen, on cryptographic constructions that rely on hash functions. In many schemes, hLen is the number of bytes produced by the chosen hash function, such as SHA-256 producing 32 bytes.
In RSA OAEP and related padding schemes, hLen plays a direct role in encoding overhead and capacity.
In key derivation and pseudorandom generation, such as HKDF, hLen is the length of the derived key
Security and design considerations: choosing a hash function with an appropriate hLen is important for meeting