SM4 Algorithm Functions# Functions described in this section can be used for various operational modes of SM4 cipher systems. mbx_sm4_set_key_mb16 mbx_sm4_encrypt/decrypt_ecb_mb16 mbx_sm4_encrypt/decrypt_cbc_mb16 mbx_sm4_encrypt/decrypt_ctr128_mb16 mbx_sm4_encrypt/decrypt_ofb_mb16 mbx_sm4_encrypt/decrypt_cfb128_mb16