@startuml overall_process
left to right direction

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state "16 字节的'\0'" as step1
state "MD 函数" as step2
state "MD 函数" as step3
state "第1个16字节分组" as step21
state "第2个16字节分组" as step31
state "……" as step4
state "MD 函数" as step5
state "第n个16字节分组" as step51
state "MD 函数" as step6
state "数据的16字节校验码" as step61
state "取缓冲区前 16 字节作为结果" as step7


[*] --> step1
step1 --> step2
step21 -right->step2
step2 --> step3
step31 -right->step3
step3 --> step4
step4 --> step5
step51 -right->step5
step5 --> step6
step61 -right->step6
step6 --> step7
step7 --> [*]
@enduml