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ericperretericperret
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‎vigenere_tool.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Vigenère +/- Clé</title>
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<style>
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body {
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font-family: monospace;
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font-size: 14px;
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margin: 20px;
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background: #f5f5f5;
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}
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.container {
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max-width: 800px;
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margin: 0 auto;
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}
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h1 {
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text-align: center;
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}
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label {
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display: block;
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margin-top: 15px;
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font-weight: bold;
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}
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textarea, input {
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width: 100%;
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padding: 10px;
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font-family: monospace;
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font-size: 14px;
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border: 1px solid #999;
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box-sizing: border-box;
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}
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textarea {
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height: 80px;
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resize: vertical;
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}
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input {
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height: 40px;
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}
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.result {
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margin-top: 15px;
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padding: 15px;
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background: #fff;
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border: 2px solid #333;
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}
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.result h3 {
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margin: 0 0 10px 0;
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}
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.result p {
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word-wrap: break-word;
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margin: 0;
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}
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#resultPlus {
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background: #d4edda;
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border-color: #28a745;
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}
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#resultMinus {
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background: #fff3cd;
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border-color: #ffc107;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<h1>Vigenère +/- Clé</h1>
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<label for="texte">Texte chiffré :</label>
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<textarea id="texte" placeholder="Entrez le texte chiffré..."></textarea>
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<label for="cle">Clé :</label>
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<input type="text" id="cle" placeholder="Ex: CLE ou LEC">
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<div class="result" id="resultPlus">
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<h3>+ Clé (chiffrement)</h3>
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<p id="outputPlus">...</p>
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</div>
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<div class="result" id="resultMinus">
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<h3>- Clé (déchiffrement)</h3>
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<p id="outputMinus">...</p>
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</div>
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</div>
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<script>
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function getShift(letter) {
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return letter.toUpperCase().charCodeAt(0) - 65;
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}
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function calculate() {
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const texte = document.getElementById('texte').value;
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const cle = document.getElementById('cle').value.toUpperCase().replace(/[^A-Z]/g, '');
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if (!cle || cle.length === 0) {
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document.getElementById('outputPlus').textContent = '...';
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document.getElementById('outputMinus').textContent = '...';
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return;
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}
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let resultPlus = '';
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let resultMinus = '';
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let keyIndex = 0;
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for (let i = 0; i < texte.length; i++) {
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const c = texte[i];
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if (c.match(/[a-zA-Z]/)) {
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const isUpper = c === c.toUpperCase();
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const val = c.toUpperCase().charCodeAt(0) - 65;
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const shift = getShift(cle[keyIndex % cle.length]);
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const plusVal = (val + shift) % 26;
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const minusVal = (val - shift + 26) % 26;
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const plusChar = String.fromCharCode(plusVal + 65);
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const minusChar = String.fromCharCode(minusVal + 65);
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resultPlus += isUpper ? plusChar : plusChar.toLowerCase();
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resultMinus += isUpper ? minusChar : minusChar.toLowerCase();
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keyIndex++;
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} else {
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resultPlus += c;
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resultMinus += c;
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}
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}
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document.getElementById('outputPlus').textContent = resultPlus;
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document.getElementById('outputMinus').textContent = resultMinus;
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}
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document.getElementById('texte').addEventListener('input', calculate);
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document.getElementById('cle').addEventListener('input', calculate);
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</script>
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</body>
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</html>

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