Encrypts or decrypts data represented as a base64 string using a specified mode. The key and initialization vector are represented as base64 strings.
Public Declare Function BLF_B64Mode Lib "diCryptoSys.dll"
(ByVal strOutput As String, ByVal strInput As String,
ByVal strKey As String, ByVal bEncrypt As Boolean,
ByVal strMode As String, ByVal strIV As String) As Long
nRet = BLF_B64Mode(strOutput, strInput, strKey, bEncrypt, strMode, strIV)
String of sufficient length to receive the output.String containing the input data in base64.String containing the key in base64.Boolean direction flag:
set as True to encrypt or False
to decrypt.String specifying the confidentiality mode:String containing the initialization vector (IV), if required,
in base64.
long _stdcall BLF_B64Mode(char *strOutput, const char *strInput,
const char *strKey, int bEncrypt, const char *strMode, const char *sIV);
Long: If successful, the return value is 0;
otherwise it returns a non-zero error code.
Blowfish.Encrypt Method (String, String, Mode, String, EncodingBase)
Blowfish.Decrypt Method (String, String, Mode, String, EncodingBase)
The length of the input string strInput must represent a multiple of the block size (8 bytes) when decoded.
If not, an error will be returned.
The initialization vector
string strIV must represent exactly 8 bytes
unless strMode is ECB, in which case strIV is ignored (use "").
The key strKey can represent up to 56 bytes.
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 strKey As String
Dim strIV As String
Dim sCorrect As String
' "7654321 Now is the time for " padded to 32 bytes with 4 nulls
strInput = "NzY1NDMyMSBOb3cgaXMgdGhlIHRpbWUgZm9yIAAAAAA="
sCorrect = "a3e01jAG3uYFsVbidAOXk1jeuecVRhbZWfFlK9X/ksw="
' Key is 0x0123456789ABCDEFF0E1D2C3B4A59687
strKey = "ASNFZ4mrze/w4dLDtKWWhw=="
' IV is 0xFEDCBA9876543210
strIV = "/ty6mHZUMhA="
' Set strOutput to be same length as strInput
strOutput = String(Len(strInput), " ")
Debug.Print "KY="; strKey
Debug.Print "IV="; strIV
Debug.Print "PT="; strInput
' Encrypt in one-off process
nRet = BLF_B64Mode(strOutput, strInput, strKey, ENCRYPT, "CBC", strIV)
Debug.Print "CT="; strOutput, nRet
Debug.Print "OK="; sCorrect
' Now decrypt back to plain text
strInput = strOutput
nRet = BLF_B64Mode(strOutput, strInput, strKey, DECRYPT, "CBC", strIV)
Debug.Print "P'="; strOutput, nRet
This should result in output as follows:
KY=ASNFZ4mrze/w4dLDtKWWhw== IV=/ty6mHZUMhA= PT=NzY1NDMyMSBOb3cgaXMgdGhlIHRpbWUgZm9yIAAAAAA= CT=a3e01jAG3uYFsVbidAOXk1jeuecVRhbZWfFlK9X/ksw= 0 OK=a3e01jAG3uYFsVbidAOXk1jeuecVRhbZWfFlK9X/ksw= P'=NzY1NDMyMSBOb3cgaXMgdGhlIHRpbWUgZm9yIAAAAAA= 0