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Resolved External Function on PBKDF2
  1. Issue
0 Votes
  1. Sim Joo Pee
  2. PowerBuilder
  3. Tuesday, 4 October 2022 12:28 AM UTC

Hi Sir or Madam,

I am deeply urgently needed help on PBKDF2 matter. I had build a local external function for this. (See Below). But, i get error which i spent days still couldnt know how to solve it. Can anyone help me? I am totally new on external function. Luckily there Topwiz free code for me to use and refer. I just followed some of the sample. But still have problem . Please see below for my codes. Your help is highly appreciated.

(A)

Function ulong BCryptDeriveKeyPBKDF2 ( &
    longptr hPrf, &
    blob pbPassword, &
    ulong cbPassword, &
    blob pbSalt, &
    ulong cbSalt, &
    ulong cIterations, &
    Ref blob pbDerivedKey, &
    ulong cbDerivedKey, &
    ulong dwFlags &
    ) Library "bcrypt.dll"

***********************************************************

(B)
//PBKDF2 - start
ULONG     lul_salt
BLOB        lblb_key
BLOB        lblb_password
BLOB        lblb_salt

//to generate random number - salt
of_gensalt(lul_salt)
messagebox('Ul_salt',string(lul_salt))

//*************
// not using the Ansi/Unicode option
lblb_password  = Blob(ls_password, EncodingAnsi!)
lblb_salt  =  Blob(string(lul_salt))

// generate
lblb_key =in_bc.of_getderivedkey(lblb_password, lblb_salt)
If IsNull(lblb_key) Then
    MessageBox(in_bc.LastFunction + " Failed", &
            in_bc.LastErrText, StopSign!)
    Return 1
End If
//*************
//PBKDF2 - end

***********************************************************

(C)  - of_gensalt

aul_Random = in_bc.of_RandomNbr()
If IsNull(aul_Random) Then
    MessageBox(in_bc.LastFunction + " Failed", &
            in_bc.LastErrText, StopSign!)
    Return
End If
***********************************************************

(D) - of_getderivedkey 

public function blob of_getderivedkey (ref blob alblb_password, ref blob alblb_salt);

BLOB        lblb_resultkey
BLOB        lblb_NullReturn

ULONG     lul_password_len
ULONG    lul_salt_len

SetNull(lblb_NullReturn)

// open an algorithm handle
If Not NT_SUCCESS(BCryptOpenAlgorithmProvider(il_hRanAlg, &
                        BCRYPT_SHA512_ALGORITHM, 0, 0)) Then
    of_ErrorCleanup("BCryptOpenAlgorithmProvider")
    Return lblb_NullReturn
End If

lul_password_len= len(alblb_password)
lul_salt_len = len(alblb_salt)

// Allocate Plain Text Buffer
//lblb_resultkey = Blob(Space(256), iEncoding)
    
messagebox('il_hAlg',string(il_hAlg))
If Not NT_SUCCESS(BCryptDeriveKeyPBKDF2(il_hAlg, &
                        alblb_password, lul_password_len, &
                        alblb_salt, lul_salt_len, &
                        1000, lblb_resultkey, 0 ,0))Then
        of_ErrorCleanup("BCryptDeriveKeyPBKDF2")
    Return lblb_NullReturn
End If

// trim off any extra space
//lblb_resultkey = BlobMid(lblb_resultkey, 1, 256)
    
of_FinalCleanup()
//
Return lblb_resultkey

 

 

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