aes128KeySize: c.function = aes128 case aes192KeySize: c.function = aes192 case aes256KeySize: c.function = aes256 } c.key = c.storage[:len(key)] copy(c.key, key) return c } // BlockFunction returns the function code for the block cipher. // It is used by the GCM implementation to invoke the KMA instruction. func BlockFunction(c *Block) int { return int(c.function) } // BlockKey returns the key for the block cipher. // It is used by the GCM implementation to invoke the KMA instruction. func BlockKey(c...