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SAMCard.bas
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SAMCard.bas
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#Include SAM.def
Declare ATR = "SAMCard"
Declare ApplicationID = "SAMCard"
EEPROM KeysInserted As Byte = 0
EEPROM InternalExists As Byte = 0
EEPROM LMK As String*16
EEPROM CommKey As String*16
EEPROM SingleCommKey As String*8
EEPROM InternalKey As String*16
Public CommKeyExists As Byte = 0
Function GetClearKey(KeyUnderLMK As String*16) As String
Private ClearKey As String*16
ClearKey = DES(-3, LMK, Mid$(KeyUnderLMK,1,8))
Mid$(ClearKey,9,8) = DES(-3, LMK, Mid$(KeyUnderLMK,9,8))
GetClearKey = ClearKey
End Function
Function DecryptComm (EncCommData$) As String
Dim DecCommData$, EncPart$ As String
Dim i As Byte
DecCommData$ = Space$(Len(EncCommData$))
For i = 1 To Len(EncCommData$) Step 8
EncPart$ = Mid$(EncCommData$, i, 8)
If Len(EncPart$) < 8 Then
EncPart$ = EncPart$ + Space$(8 - Len(EncPart$))
End If
Mid$(DecCommData$,i,8) = DES(-3, CommKey, EncPart$)
Next i
DecryptComm = DecCommData$
End Function
Function EncryptComm (DecCommData$) As String
Dim EncCommData$, DecPart$ As String
Dim i As Byte
EncCommData$ = Space$(Len(DecCommData$))
For i = 1 To Len(DecCommData$) Step 8
DecPart$ = Mid$(DecCommData$, i, 8)
If Len(DecPart$) < 8 Then
DecPart$ = DecPart$ + Space$(8 - Len(DecPart$))
End If
Mid$(EncCommData$,i,8) = DES(3, CommKey, DecPart$)
Next i
EncryptComm = EncCommData$
End Function
Command &H20 &H01 SetLMK (LMKStr As String*16)
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
If KeysInserted = 1 Then
SW1SW2 = swLoadedAlready
Exit Command
End If
If Len(LMKStr) <> 16 Then
SW1SW2 = swInvalidKeyLen
Exit Command
End If
LMK = DecryptComm(LMKStr)
KeysInserted = 1
End Command
Command &H20 &H11 EncryptData3(EncDec As String*8, KeyUnderLMK As String*16)
Private ClearKey As String*16
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
EncDec = DecryptComm(EncDec)
If KeysInserted = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
If Len(KeyUnderLMK) <> 16 Then
SW1SW2 = swInvalidKeyLen
Exit Command
End If
If Len(EncDec) <> 8 Then
SW1SW2 = swEncDecDataLen
Exit Command
End If
ClearKey = GetClearKey(KeyUnderLMK)
If Len(ClearKey) <> 16 Then
SW1SW2 = swInternalKeyErr
Exit Command
End If
EncDec = DES(3, ClearKey, EncDec)
EncDec = EncryptComm(EncDec)
End Command
Command &H20 &H12 EncryptData1(EncDec As String*8, KeyUnderLMK As String*16)
Private ClearKey As String*16
EncDec = DES(-1, SingleCommKey, EncDec)
If KeysInserted = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
If Len(KeyUnderLMK) <> 16 Then
SW1SW2 = swInvalidKeyLen
Exit Command
End If
If Len(EncDec) <> 8 Then
SW1SW2 = swEncDecDataLen
Exit Command
End If
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
ClearKey = GetClearKey(KeyUnderLMK)
If Len(ClearKey) <> 16 Then
SW1SW2 = swInternalKeyErr
Exit Command
End If
EncDec = DES(+3, ClearKey, EncDec)
EncDec = DES(+1, SingleCommKey, EncDec)
End Command
Command &H20 &H13 EncryptData0(EncDec As String*8, KeyUnderLMK As String*16)
Private ClearKey As String*16
If KeysInserted = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
If Len(KeyUnderLMK) <> 16 Then
SW1SW2 = swInvalidKeyLen
Exit Command
End If
If Len(EncDec) <> 8 Then
SW1SW2 = swEncDecDataLen
Exit Command
End If
ClearKey = GetClearKey(KeyUnderLMK)
If Len(ClearKey) <> 16 Then
SW1SW2 = swInternalKeyErr
Exit Command
End If
EncDec = DES(+3, ClearKey, EncDec)
End Command
Command &H20 &H21 SetCommKey(EncCommKey As String*19)
Private Zero As String*8 = 0,0,0,0,0,0,0,0
CommKey = DES(-3 , InitialCommKey, Mid$(EncCommKey,1,8))
Mid$(CommKey,9,8) = DES(-3 , InitialCommKey, Mid$(EncCommKey,9,8))
If Mid$(DES(+3, CommKey, Zero),1,3) <> Mid$(EncCommKey,17,3) Then
SW1SW2 = swInvCheckValue
Exit Command
End If
SingleCommKey = DES(+3, CommKey, Zero)
CommKeyExists = 1
End Command
Command &H20 &H06 CheckLMK (CheckValue As String*8)
Private Zero As String*8 = 0,0,0,0,0,0,0,0
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
If KeysInserted = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
CheckValue = DES(3, LMK, Zero)
Mid$(CheckValue, 5, 4) = Mid$(Zero, 1, 4)
CheckValue = EncryptComm(CheckValue)
End Command
Command &H20 &H51 SetInternalKey(IntKey As String*16)
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
If InternalExists = 1 Then
SW1SW2 = swLoadedAlready
Exit Command
End If
If Len(IntKey) <> 16 Then
SW1SW2 = swInvalidKeyLen
Exit Command
End If
InternalKey = DecryptComm(IntKey)
InternalExists = 1
End Command
Command &H20 &H52 CheckInternalKey(CheckValue As String*8)
Private Zero As String*8 = 0,0,0,0,0,0,0,0
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
If InternalExists = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
CheckValue = DES(3, InternalKey, Zero)
Mid$(CheckValue, 5, 4) = Mid$(Zero, 1, 4)
CheckValue = EncryptComm(CheckValue)
End Command
Command &H20 &H54 VerifyInternalData(DecData As String*8, EncData As String*8)
Private CompData As String*8
If CommKeyExists = 0 Then
SW1SW2 = swCommKeyMissing
Exit Command
End If
If InternalExists = 0 Then
SW1SW2 = swKeysMissing
Exit Command
End If
'CompData =
If DES(3, InternalKey, DecData) <> EncData Then
SW1SW2 = swInternalKeyErr
Exit Command
End If
End Command