Message verification-based secret key expansion processing method and circuit

The invention discloses a method and a circuit for processing key expansion based on message verification. The processing circuit comprises a memory and an HMAC processor. The HMAC processor executes the following steps: in an initial operation round, loading a plaintext file and an initial vector into a key hash message authentication program to generate a temporary storage vector and a common vector; generating a first combined data block according to the plaintext file and the temporary storage vector in at least one other operation round; loading the first combined data block and the common vector into a key hash message authentication program to generate a new temporary storage vector; recursively executing a key hash message authentication program according to the new temporary storage vector and the common vector until all other operation rounds are completed; and outputting the latest temporary storage vector as the target key. 一种基于消息验证的密钥扩展的处理方法与电路，处理电路包括存储器与HMAC处理器。HMAC处理器执行以下步骤在初始运算回合，将明文文件与初始向量载入密