JavaScript实现RSA加密和解密

const forge = require('node-forge'); const fs = require('fs'); const path = require('path'); class RSACrypto { constructor() { this.publicKeyPath = path.join(__dirname, 'publicKey.pem'); this.privateKeyPath = path.join(__dirname, 'privateKey.pem'); } // 生成RSA密钥对并保存到文件 generateKeys() { const {privateKey, publicKey} = forge.pki.rsa.generateKeyPair(2048); const publicPem = forge.pki.publicKeyToPem(publicKey); const privatePem = forge.pki.privateKeyToPem(privateKey); fs.writeFileSync(this.publicKeyPath, publicPem, 'utf8'); fs.writeFileSync(this.privateKeyPath, privatePem, 'utf8'); console.log("RSA密钥对已生成并保存到文件中。"); } // 从文件中加载公钥 loadPublicKey() { if (!fs.existsSync(this.publicKeyPath)) { throw new Error("公钥文件不存在，请先生成密钥对。"); } const publicPem = fs.readFileSync(this.publicKeyPath, 'utf8'); return forge.pki.publicKeyFromPem(publicPem); } // 从文件中加载私钥 loadPrivateKey() { if (!fs.existsSync(this.privateKeyPath)) { throw new Error("私钥文件不存在，请先生成密钥对。"); } const privatePem = fs.readFileSync(this.privateKeyPath, 'utf8'); return forge.pki.privateKeyFromPem(privatePem); } // 使用公钥加密消息 encryptMessage(message) { const publicKey = this.loadPublicKey(); const encrypted = publicKey.encrypt(message, 'RSA-OAEP', { md: forge.md.sha256.create(), }); return forge.util.encode64(encrypted); // Base64编码的加密数据 } // 使用私钥解密消息 decryptMessage(encryptedMessage) { const privateKey = this.loadPrivateKey(); const encryptedBytes = forge.util.decode64(encryptedMessage); // 解码Base64 const decrypted = privateKey.decrypt(encryptedBytes, 'RSA-OAEP', { md: forge.md.sha256.create(), }); return decrypted; } } module.exports = RSACrypto;