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SimpleEncoder.1sc
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SimpleEncoder.1sc
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//------------------------------------------------
//--- 010 Editor Script File
//
// File: SimpleEncoder.1sc
// Authors: Didier Stevens
// Version: 1.0
// Purpose: Encode current selection by shifting characters. Supported encodings: ROT-5, ROT-13, ROT-47, Caesar and custom shifts. The complete file is encoded when nothing is selected.
// Category: Binary
// History:
// 1.0 2018-12-25 Didier Stevens: start
//
// Source code put in public domain by Didier Stevens, no Copyright
// https://DidierStevens.com
// Use at your own risk
//------------------------------------------------
#define TITLE "SimpleEncoder"
#define CODE_ROT5_ID 0
#define CODE_ROT5_STR "ROT-5"
#define CODE_ROT13_ID 1
#define CODE_ROT13_STR "ROT-13"
#define CODE_ROT47_ID 2
#define CODE_ROT47_STR "ROT-47"
#define CODE_CAESAR_ENCODE_ID 3
#define CODE_CAESAR_ENCODE_STR "Caesar (encode)"
#define CODE_CAESAR_DECODE_ID 4
#define CODE_CAESAR_DECODE_STR "Caesar (decode)"
#define CODE_CUSTOM_DIGIT_ID 5
#define CODE_CUSTOM_DIGIT_STR "Custom shift (characters: 0-9)"
#define CODE_CUSTOM_AZ_ID 6
#define CODE_CUSTOM_AZ_STR "Custom shift (characters: a-zA-Z)"
#define CODE_CUSTOM_PRT_ID 7
#define CODE_CUSTOM_PRT_STR "Custom shift (characters: !-~)"
int CalculateShift(ubyte bRead, ubyte bStart, ubyte bEnd, int bShift)
{
if (bRead >= bStart && bRead <= bEnd)
{
if (bShift < 0)
bShift = (bEnd - bStart + 1) + bShift;
return bStart + ((bRead - bStart + bShift) % (bEnd - bStart + 1)) - bRead;
}
else
return 0;
}
void Main(void)
{
int iIter, iStart, iSize;
int iChoice;
ubyte bRead;
int iShift;
int iShiftParameter;
// Check that a file is open
if(FileCount() == 0)
{
MessageBox(idOk, TITLE, TITLE + " can only be executed when a file is loaded.");
return;
}
// Initializes the variables
iSize = GetSelSize();
iStart = GetSelStart();
// Check that bytes were selected
if(iSize == 0)
{
iSize = FileSize();
iStart = 0;
}
iChoice = InputRadioButtonBox(TITLE, "Choose encoding:", 0, CODE_ROT5_STR, CODE_ROT13_STR, CODE_ROT47_STR, CODE_CAESAR_ENCODE_STR, CODE_CAESAR_DECODE_STR, CODE_CUSTOM_DIGIT_STR, CODE_CUSTOM_AZ_STR, CODE_CUSTOM_PRT_STR);
if (-1 == iChoice)
return;
if (iChoice >= CODE_CUSTOM_DIGIT_ID && iChoice <= CODE_CUSTOM_PRT_ID)
{
iShiftParameter = InputNumber(TITLE, "Choose shift value:", "");
if (BAD_VALUE == iShiftParameter || 0 == iShiftParameter)
{
MessageBox(idOk, TITLE, "Please provide a valid shift value.");
return;
}
}
// Modify the selection
for (iIter = 0; iIter < iSize; iIter++)
{
bRead = ReadUByte(iStart + iIter);
// Modify the current byte
switch (iChoice)
{
case CODE_ROT5_ID:
if (0 != iShift = CalculateShift(bRead, 48, 57, 5))
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_ROT13_ID:
iShift = CalculateShift(bRead, 65, 90, 13);
if (0 == iShift)
iShift = CalculateShift(bRead, 97, 122, 13);
if (0 != iShift)
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_ROT47_ID:
if (0 != iShift = CalculateShift(bRead, 33, 126, 47))
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_CAESAR_ENCODE_ID:
iShift = CalculateShift(bRead, 65, 90, 3);
if (0 == iShift)
iShift = CalculateShift(bRead, 97, 122, 3);
if (0 != iShift)
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_CAESAR_DECODE_ID:
iShift = CalculateShift(bRead, 65, 90, -3);
if (0 == iShift)
iShift = CalculateShift(bRead, 97, 122, -3);
if (0 != iShift)
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_CUSTOM_DIGIT_ID:
if (0 != iShift = CalculateShift(bRead, 48, 57, iShiftParameter))
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_CUSTOM_AZ_ID:
iShift = CalculateShift(bRead, 65, 90, iShiftParameter);
if (0 == iShift)
iShift = CalculateShift(bRead, 97, 122, iShiftParameter);
if (0 != iShift)
WriteUByte(iStart + iIter, bRead + iShift);
break;
case CODE_CUSTOM_PRT_ID:
if (0 != iShift = CalculateShift(bRead, 33, 126, iShiftParameter))
WriteUByte(iStart + iIter, bRead + iShift);
break;
}
}
}
Main();