(Visual Basic 6.0) BCrypt Verify a Password (Check if Password is Correct)

A system that uses BCrypt for storing passwords would not store the actual password, but would instead store the bcrypt hash of the password. When a user presents the password, such as for login, call BCryptVerify to verify the password against the stored bcrypt hash.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim crypt As New ChilkatCrypt2

Dim storedHash As String
storedHash = "$2a$10$H5kIVktMGzAPKGKNAe9DVu0iwEqfhv/o4MMJ/Dzw/MPy1leOE9NOK"
Dim password As String
password = "mySecretPassword"

Dim passwordValid As Long
passwordValid = crypt.BCryptVerify(password,storedHash)
If (passwordValid = 1) Then
    Debug.Print password & " is valid."
Else
    Debug.Print password & " is NOT valid."
End If

password = "notAValidPassword"
passwordValid = crypt.BCryptVerify(password,storedHash)
If (passwordValid = 1) Then
    Debug.Print password & " is valid."
Else
    Debug.Print password & " is NOT valid."
End If

' Output should be:

' 	mySecretPassword is valid.
' 	notAValidPassword is NOT valid.