node.js - Creating an HMAC with an existing password hash and salt -


for migration reasons need take existing password & salt , place firebase. i'm uploading accounts firebase using google identity kit. kit allows me create users , requires sha-1 password salted.

var user1 = { localid: userid, email: email, salt: new buffer('salt-1'),   passwordhash: crypto.createhmac('sha1', this.hashkey).update('a password' + 'salt-1').digest() };

above uploaded server. there way crypto.createhmac existing sha-1 hash , salt? i've tried replacing passwordhash , salt values, need encoded same way createhmac encodes them.

see hmac implementation.

the key hmac code is:

hash(o_key_pad ∥ hash(i_key_pad ∥ message))

so seems answer no since padded key needs concatenated message.


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