QuickHash Library

Type Library

QHASH_BlockHMAC

Return value

Parameters

nAlgID

    [in] The ID of the hash algorithm selected for calculations. For example, nAlgID has to be set to SHA1_ALGID when you need to calculate the HMAC using SHA-1 hash algorithm.

    Note. All supported hash algorithms with their corresponding IDs are specified in the Predefined Constants List.

pDigest

    [out] The memory buffer that will receive the HMAC.

    Note. All predefined types are specified in the Predefined Types List.

pSrc

    [in] A continuous memory block for which to calculate the HMAC.

nSrcLength

    [in] Length in bytes of the memory block.

pKey

    [in] The key which represents a continuous memory block.

nKeyLength

    [in] Length in bytes of the key.

Remarks

Calculates the HMAC for the continuous memory block specified by pSrc using the key specified by pKey. The HMAC is retrieved in the pDigest memory buffer.

VB Example

Private Sub MyButton_Click()

    Dim MyStrData As String

    MyStrData = "Hello World!"

    Dim MyStrKey As String

    MyStrKey = "password"

    Dim nLen As Long

    nLen = Len(MyStrData)

    Dim nLenKey As Long

    nLenKey = Len(MyStrKey)

    'Convert the string to byte array

    Dim MyBinData() As Byte

    ReDim MyBinData(1 To nLen)

    For i = 1 To nLen

        MyBinData(i) = Asc(Mid(MyStrData, i, 1))

    Next i

    'Convert the key to byte array

    Dim MyBinKey() As Byte

    ReDim MyBinKey(1 To nLenKey)

    For i = 1 To nLenKey

        MyBinKey(i) = Asc(Mid(MyStrKey, i, 1))

    Next i

    'Calculate the MD5-HMAC

    Dim Hmac As QHASH_Digest

    QHASH_BlockHMAC MD5_ALGID, Hmac, MyBinData(1), nLen, MyBinKey(1), nLenKey

    'Show the MD5-HMAC in hexadecimal representation

    MsgBox QHASH_ConvertToHex(Hmac.Value(0), MD5_DIGESTSIZE, True) 

End Sub

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See Also    QHASH_BlockHexHMAC, QHASH_StringHMAC, QHASH_FileHMAC, QHASH_ConvertToHex