Function pkcs1v15_verify_ripemd160 

pub fn pkcs1v15_verify_ripemd160(
    pk: &RsaPublicKey,
    message: &[u8],
    sig: &[u8],
) -> bool

Convenience: hash a message with RIPEMD-160, then sign / verify. Legacy: included for compatibility with older systems (Bitcoin, some 2000s X.509 CAs); not recommended for new designs.