The result of SHA-256 of an empty string is:
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
The result of SHA-256 of an empty string is:
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
https://www.di-mgt.com.au/sha_testvectors.html
https://xorbin.com/tools/sha256-hash-calculator
原文：https://www.cnblogs.com/chucklu/p/14047074.html