simple_rsa_encryption_service/server.js at main · awesomeKelly04/simple_rsa_encryption_service · GitHub

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require('dotenv').config();

const express = require('express');
const NodeRSA = require('node-rsa');

const app = express();
app.use(express.json());

// Constants matching Java code
const KEY_ALGORITHM = "RSA";
const SECURE_PADDING = "RSA/ECB/PKCS1Padding";

// Home page
app.get('/', (req, res) => {
    res.send(`
        <html>
            <head><title>Crypto Service</title></head>
            <body>
                <h1>Crypto Service is running!</h1>
                <p>Available endpoints:</p>
                <ul>
                    <li>POST /encrypt</li>
                    <li>POST /sign</li>
                    <li>POST /decrypt</li>
                    <li>POST /verify</li>
                    <li>POST /headers (for Postman - SecureToken & Signature)</li>
                </ul>
                <p>Port: ${PORT}</p>
            </body>
        </html>
    `);
});

// Health check
app.get('/health', (req, res) => {
    res.json({ status: 'ok', service: 'crypto-service' });
});

// Helper function to create RSA key from base64
function createKeyFromBase64(keyBase64, isPrivate = false) {
    try {
        // Remove any whitespace or newlines
        const cleanKey = keyBase64.replace(/\s+/g, '');

        if (isPrivate) {
            // For private key (PKCS#8 format)
            const key = new NodeRSA();
            key.importKey(Buffer.from(cleanKey, 'base64'), 'pkcs8-der-private');
            return key;
        } else {
            // For public key (X.509/SPKI format)
            const key = new NodeRSA();
            key.importKey(Buffer.from(cleanKey, 'base64'), 'pkcs8-der-public');
            return key;
        }
    } catch (error) {
        throw new Error(`Failed to create RSA key: ${error.message}`);
    }
}

// Encrypt with public key
app.post('/encrypt', (req, res) => {
    try {
        const { plainText, publicKey } = req.body;

        if (!plainText || !publicKey) {
            return res.json({
                success: false,
                encrypted: plainText || '',
                error: 'Missing plainText or publicKey'
            });
        }

        // Create RSA key from base64
        const rsaKey = createKeyFromBase64(publicKey, false);

        // Configure the key for PKCS1 padding (matches Java)
        rsaKey.setOptions({ encryptionScheme: 'pkcs1' });

        // Encrypt
        const encrypted = rsaKey.encrypt(plainText, 'base64');

        res.json({
            success: true,
            algorithm: KEY_ALGORITHM,
            padding: SECURE_PADDING,
            encrypted: encrypted
        });

    } catch (error) {
        console.error('Encryption error:', error.message);
        res.json({
            success: false,
            encrypted: req.body.plainText || '',  // Fallback like Java
            error: error.message
        });
    }
});

// Sign with private key
app.post('/sign', (req, res) => {
    try {
        const { plainText, privateKey } = req.body;

        if (!plainText || !privateKey) {
            return res.json({
                success: false,
                signature: null,
                error: 'Missing plainText or privateKey'
            });
        }

        // Create RSA key from base64
        const rsaKey = createKeyFromBase64(privateKey, true);

        // Sign with SHA256 (matches Java's SHA256withRSA)
        // NodeRSA uses PSS padding by default, we need to change it to PKCS1 for Java compatibility
        rsaKey.setOptions({ signingScheme: 'pkcs1-sha256' });

        const signature = rsaKey.sign(plainText, 'base64', 'utf8');

        res.json({
            success: true,
            algorithm: 'SHA256withRSA',
            signature: signature
        });

    } catch (error) {
        console.error('Signing error:', error.message);
        res.json({
            success: false,
            signature: null,  // Fallback like Java
            error: error.message
        });
    }
});

// Decrypt with private key
app.post('/decrypt', (req, res) => {
    try {
        const { encryptedText, privateKey } = req.body;

        if (!encryptedText || !privateKey) {
            return res.json({
                success: false,
                decrypted: encryptedText || '',
                error: 'Missing encryptedText or privateKey'
            });
        }

        // Create RSA key from base64
        const rsaKey = createKeyFromBase64(privateKey, true);

        // Configure for PKCS1 padding
        rsaKey.setOptions({ encryptionScheme: 'pkcs1' });

        // Decrypt
        const decrypted = rsaKey.decrypt(encryptedText, 'utf8');

        res.json({
            success: true,
            algorithm: KEY_ALGORITHM,
            padding: SECURE_PADDING,
            decrypted: decrypted
        });

    } catch (error) {
        console.error('Decryption error:', error.message);
        res.json({
            success: false,
            decrypted: req.body.encryptedText || '',  // Fallback like Java
            error: error.message
        });
    }
});

// Verify signature
app.post('/verify', (req, res) => {
    try {
        const { plainText, signature, publicKey } = req.body;

        if (!plainText || !signature || !publicKey) {
            return res.json({
                success: false,
                valid: false,
                error: 'Missing parameters'
            });
        }

        // Create RSA key from base64
        const rsaKey = createKeyFromBase64(publicKey, false);

        // Configure for PKCS1-SHA256 verification
        rsaKey.setOptions({ signingScheme: 'pkcs1-sha256' });

        // Verify signature
        const isValid = rsaKey.verify(plainText, signature, 'utf8', 'base64');

        res.json({
            success: true,
            algorithm: 'SHA256withRSA',
            valid: isValid
        });

    } catch (error) {
        console.error('Verification error:', error.message);
        res.json({
            success: false,
            valid: false,
            error: error.message
        });
    }
});

// All-in-one endpoint for SecureToken & Signature headers (different texts and keys)
app.post('/headers', (req, res) => {
    try {
        const {
            secureTokenData,   // Data for SecureToken encryption
            signatureData,     // Data for Signature signing
            publicKey,         // Public key for encryption
            privateKey         // Private key for signing
        } = req.body;

        // Validate required parameters
        if (!secureTokenData || !signatureData || !publicKey || !privateKey) {
            return res.json({
                success: false,
                secureToken: secureTokenData || '',
                signature: null,
                error: 'Missing required parameters: secureTokenData, signatureData, publicKey, privateKey'
            });
        }

        // 1. Generate SecureToken (encrypt with public key)
        const publicKeyObj = createKeyFromBase64(publicKey, false);
        publicKeyObj.setOptions({ encryptionScheme: 'pkcs1' });

        const secureToken = publicKeyObj.encrypt(secureTokenData, 'base64');

        // 2. Generate Signature (sign with private key)
        const privateKeyObj = createKeyFromBase64(privateKey, true);
        privateKeyObj.setOptions({ signingScheme: 'pkcs1-sha256' });

        const signature = privateKeyObj.sign(signatureData, 'base64', 'utf8');

        res.json({
            success: true,
            secureToken: secureToken,
            signature: signature,
            algorithms: {
                secureToken: `${KEY_ALGORITHM}/${SECURE_PADDING}`,
                signature: 'SHA256withRSA'
            },
            details: {
                secureTokenDataLength: secureTokenData.length,
                signatureDataLength: signatureData.length
            }
        });

    } catch (error) {
        console.error('headers endpoint error:', error.message);
        res.json({
            success: false,
            secureToken: req.body.secureTokenData || '',  // Fallback like Java
            signature: null,                              // Fallback like Java
            error: error.message
        });
    }
});

// Error handling for port in use
function onError(error) {
    if (error.syscall !== 'listen') {
        throw error;
    }

    const bind = typeof PORT === 'string' ? 'Pipe ' + PORT : 'Port ' + PORT;

    switch (error.code) {
        case 'EACCES':
            console.error(bind + ' requires elevated privileges');
            process.exit(1);
        case 'EADDRINUSE':
            console.error(bind + ' is already in use');
            console.log('Trying alternative port...');

            // Try alternative port
            const altPort = parseInt(PORT) + 1;
            app.listen(altPort, () => {
                console.log(`✅ Service started on alternative port: ${altPort}`);
                console.log(`📍 Local: http://localhost:${altPort}`);
            });
            break;
        default:
            throw error;
    }
}

// Start server
const PORT = process.env.PORT || 3000;
const server = app.listen(PORT, () => {
    console.log('========================================');
    console.log('🚀 Crypto Service Started! (Using node-rsa)');
    console.log('========================================');
    console.log(`📍 Local: http://localhost:${PORT}`);
    console.log('');
    console.log('📋 Available Endpoints:');
    console.log('   POST /encrypt    - Encrypt with public key');
    console.log('   POST /sign       - Sign with private key');
    console.log('   POST /decrypt    - Decrypt with private key');
    console.log('   POST /verify     - Verify signature');
    console.log('   POST /headers    - Get SecureToken & Signature headers for Postman');
    console.log('   GET  /health     - Health check');
    console.log('   GET  /           - Service info');
    console.log('');
    console.log('🔐 Required Parameters for /headers:');
    console.log('   - secureTokenData: Data to encrypt for SecureToken');
    console.log('   - signatureData: Data to sign for Signature');
    console.log('   - publicKey: Base64 RSA public key');
    console.log('   - privateKey: Base64 RSA private key');
    console.log('========================================');
});

server.on('error', onError);