no. SHA256 is a kind of hash algorithm, which is used to compress data into 256-bit hash value, and is often used in digital signature, message authentication, data integrity check and so on. RSA is a public key encryption algorithm, which uses a pair of keys (public key and private key) to realize encryption and decryption. SHA256withRSA is a combination of SHA256 hash algorithm and RSA encryption algorithm, which is often used in digital signature and data encryption.