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sha256 init update final

sha256是可以分批处理输入的，满足数据不是一次性处理完的场合

参考文档

使用说明

  • SHA256_Init(): initializes a SHA_CTX structure.
  • SHA256_Update(): can be called repeatedly with chunks of the message to be hashed (len bytes at data).
  • SHA256_Final(): places the message digest in md, which must have space for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the SHA_CTX.

SHA256_Update()可以被多次调用，最后通过SHA256_Final()算出最终值；