(Excel) Password_Digest = Base64 (SHA-1 ( nonce + created + SHA-1 (password) ) )

Demonstrates how to compute:

Password_Digest = Base64 (SHA-1 ( nonce + created + SHA-1 (password)))

Download Excel Class Modules Chilkat Excel Class Modules

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.


password = "secret"

Dim crypt As Chilkat.Crypt2
Set crypt = Chilkat.NewCrypt2
crypt.HashAlgorithm = "SHA-1"
crypt.EncodingMode = "base64"

'  Generate a 16-byte random nonce
Dim prng As Chilkat.Prng
Set prng = Chilkat.NewPrng
Dim bd As Chilkat.BinData
Set bd = Chilkat.NewBinData
Dim success As Boolean
success = prng.GenRandomBd(16,bd)

'  Get the current date/time in a string with this format: 2010-06-08T07:26:50Z
Dim dt As Chilkat.CkDateTime
Set dt = Chilkat.NewCkDateTime
success = dt.SetFromCurrentSystemTime()

created = dt.GetAsTimestamp(False)
success = bd.AppendString(created,"utf-8")

'  This example wishes to calculate a password digest like this:
'  Password_Digest = Base64 ( SHA-1 ( nonce + created + SHA-1(password) ) )

'  First SHA-1 digest the password...

passwordSha1 = crypt.HashStringENC(password)
'  Append the 20 binary bytes of the SHA1 hash to bd, which already contains the nonce and created date/time.
success = bd.AppendEncoded(passwordSha1,"base64")


passwordDigest = crypt.HashBdENC(bd)

Debug.Print "Base64 password digest = "; passwordDigest