why md.update() two times get difference result? i must re-create every time for new input?

[creatxrgithub]

why md.update() two times get difference result?

or every time for new input, i must re-create and cannot use update() ?

let md5 = forge.md.md5.create();

md5.update(forge.util.encodeUtf8('你我他'));  //必須彊制 utf8 編碼，否則結果錯誤
console.log(md5.digest().toHex());
md5.update(forge.util.encodeUtf8('你我他'));  //必須彊制 utf8 編碼，否則結果錯誤
console.log(md5.digest().toHex());

md5 = forge.md.md5.create();
md5.update('你我他','utf8');
console.log(md5.digest().toHex());

output:

23b3e52000cbb65f4f39f3c22cbeb8b2
424d60d744cc271737266ecea1d14796
23b3e52000cbb65f4f39f3c22cbeb8b2

[j4k0xb]

it's for hashing data that's split up into multiple chunks. create a new md5 instance for new input.