Encrypts or decrypts data represented as a hexadecimal string using a specified mode. The key and initialization vector are represented as a hexadecimal string.
Public Declare Function BLF_HexMode Lib "diCryptoSys.dll"
(ByVal strOutput As String, ByVal strInput As String,
ByVal strHexKey As String, ByVal bEncrypt As Boolean,
ByVal strMode As String, ByVal strHexIV As String) As Long
nRet = BLF_HexMode(strOutput, strInput, strHexKey, bEncrypt, strMode, strHexIV)
String of sufficient length to receive the output.String containing the input data in hexadecimal.String containing the key in hexadecimal.Boolean direction flag:
set as True to encrypt or False
to decrypt.String specifying the confidentiality mode:String containing the initialization vector (IV)
in hexadecimal.
long _stdcall BLF_HexMode(char *strOutput, const char *strInput,
const char *strHexKey, int bEncrypt, const char *strMode, const char *strHexIV);
Long: If successful, the return value is 0;
otherwise it returns a non-zero error code.
Blowfish.Encrypt Method (String, String, Mode, String)
Blowfish.Decrypt Method (String, String, Mode, String)
blf.HexMode
Public Function HexMode(ByVal strInput As String, ByVal strHexKey As String, ByVal bEncrypt As Boolean, ByVal strMode As String, ByVal strHexIV As String) As String
See blf.HexMode.
The length of the input string strInput must be a multiple of 16 hex characters long
(i.e. representing a multiple of 8 bytes). If not, an error code will be returned..
The initialization vector
string strIV must be exactly 16 hex characters long
(i.e. representing exactly 8 bytes) unless strMode is ECB,
in which case strIV is ignored (use "").
The key strKey can be any even length between 2 and 112 hexadecimal characters.
Valid hexadecimal characters are [0-9A-Fa-f].
The output string strOutput must be set up with at least the same
number of characters as the input string before calling.
The variables strOutput and strInput should be different.
Dim nRet As Long
Dim strOutput As String
Dim strInput As String
Dim strHexKey As String
Dim strHexIV As String
Dim sCorrect As String
' "7654321 Now is the time for " padded to 32 bytes with 4 nulls
strInput = "37363534333231204E6F77206973207468652074696D6520666F722000000000"
sCorrect = "6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC"
strHexKey = "0123456789ABCDEFF0E1D2C3B4A59687"
strHexIV = "FEDCBA9876543210"
' Set strOutput to be same length as strInput
strOutput = String(Len(strInput), " ")
Debug.Print "KY="; strHexKey
Debug.Print "IV="; strHexIV
Debug.Print "PT="; strInput
' Encrypt in one-off process
nRet = BLF_HexMode(strOutput, strInput, strHexKey, ENCRYPT, "CBC", strHexIV)
Debug.Print "CT="; strOutput, nRet
Debug.Print "OK="; sCorrect
' Now decrypt back to plain text
strInput = strOutput
nRet = BLF_HexMode(strOutput, strInput, strHexKey, DECRYPT, "CBC", strHexIV)
Debug.Print "P'="; strOutput, nRet
This should result in output as follows:
KY=0123456789ABCDEFF0E1D2C3B4A59687 IV=FEDCBA9876543210 PT=37363534333231204E6F77206973207468652074696D6520666F722000000000 CT=6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC 0 OK=6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC P'=37363534333231204E6F77206973207468652074696D6520666F722000000000 0