Cool_Tools/CyberChef
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Added operation for entropy visualization as an image

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This commit is contained in:
mshwed 2019-04-06 19:40:07 -04:00
parent f988a958bb
commit b7fb9635e5
1 changed files with 55 additions and 7 deletions
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60
src/core/operations/AdvancedEntropy.mjs
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@ -34,7 +34,7 @@ class AdvancedEntropy extends Operation {
{
"name": "Visualization",
"type": "option",
"value": ["Histogram (Bar)", "Histogram (Line)", "Curve"]
"value": ["Histogram (Bar)", "Histogram (Line)", "Curve", "Image"]
}
];
}
@ -71,10 +71,11 @@ class AdvancedEntropy extends Operation {
* @param inputBytes
* @returns {entropyData}
*/
calculateScanningEntropy(inputBytes) {
let entropyData = [];
let binSelection = Math.ceil(inputBytes.length / 256);
let binWidth = binSelection < 256 ? 256 : binSelection;
calculateScanningEntropy(inputBytes, binWidth) {
const entropyData = [];
binWidth = binWidth
? Math.floor(inputBytes.length / binWidth)
: Math.floor(inputBytes.length / 256);
for (let bytePos = 0; bytePos < inputBytes.length; bytePos+=binWidth) {
const block = inputBytes.slice(bytePos, bytePos+binWidth)
@ -294,7 +295,53 @@ class AdvancedEntropy extends Operation {
this.createAxes(svg, xScale, yScale, svgHeight, svgWidth, margins, "Scanning Entropy" , `Block (${binWidth}B)`, "Entropy");
console.log('TEST', entropyData);
return svg._groups[0][0].outerHTML;
}
/**
* Creates an image representation of the entropy
*
* @param {byteArray} input
* @param {number} blockSize
* @returns {HTML}
*/
createEntropyImage(inputBytes) {
const svgHeight = 100,
svgWidth = 100,
cellSize = 1,
nodes = [];
const { entropyData } = this.calculateScanningEntropy(inputBytes, svgWidth*svgHeight);
for (let i = 0; i < entropyData.length; i++) {
nodes.push({
x: i % svgWidth,
y: Math.floor(i / svgWidth),
entropy: entropyData[i]
});
}
const document = new nodom.Document();
let svg = document.createElement("svg");
svg = d3.select(svg)
.attr("width", "100%")
.attr("height", "100%")
.attr("viewBox", `0 0 ${svgWidth} ${svgHeight}`);
const greyScale = d3.scaleLinear()
.domain([0, d3.max(entropyData, d => d)])
.range(["#000000", "#FFFFFF"])
.interpolate(d3.interpolateRgb);
svg
.selectAll("rect")
.data(nodes)
.enter().append("rect")
.attr("x", (d, i) => d.x * cellSize)
.attr("y", (d, i) => d.y * cellSize)
.attr("width", cellSize)
.attr("height", cellSize)
.style("fill", (d) => greyScale(d.entropy))
return svg._groups[0][0].outerHTML;
}
@ -316,6 +363,7 @@ class AdvancedEntropy extends Operation {
if (visualizationType === "Histogram (Bar)") svgData = this.createByteFrequencyBarHistogram(entropyData);
else if (visualizationType === "Histogram (Line)") svgData = this.createByteFrequencyLineHistogram(entropyData);
else if (visualizationType === "Curve") svgData = this.createEntropyCurve(input);
else if (visualizationType === "Image") svgData = this.createEntropyImage(input);
return svgData;
}