怎样进行Java RSA 加解密? |
public class RSAHelper * * 得到公钥 * @param key 密钥字符串(经过base64编码) * @throws Exception */ public static PublicKey getPublicKey(String key) throws Exception { byte[] keyBytes; keyBytes = (new BASE64Decoder()).decodeBuffer(key); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(keySpec); return publicKey; } * * 得到私钥 * @param key 密钥字符串(经过base64编码) * @throws Exception */ public static PrivateKey getPrivateKey(String key) throws Exception { byte[] keyBytes; keyBytes = (new BASE64Decoder()).decodeBuffer(key); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(keySpec); return privateKey; } * * 得到密钥字符串(经过base64编码) * @return */ public static String getKeyString(Key key) throws Exception { byte[] keyBytes = key.getEncoded(); String s = (new BASE64Encoder()).encode(keyBytes); return s; } public static void main(String[] args) throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); //密钥位数 keyPairGen.initialize(1024); //密钥对 KeyPair keyPair = keyPairGen.generateKeyPair(); // 公钥 PublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 私钥 PrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); String publicKeyString = getKeyString(publicKey); System.out.println("public:n" + publicKeyString); String privateKeyString = getKeyString(privateKey); System.out.println("private:n" + privateKeyString); //加解密类 Cipher cipher = Cipher.getInstance("RSA");//Cipher.getInstance("RSA/ECB/PKCS1Padding"); //明文 byte[] plainText = "我们都很好!邮件:@sina.com".getBytes(); //加密 cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] enBytes = cipher.doFinal(plainText); //通过密钥字符串得到密钥 publicKey = getPublicKey(publicKeyString); privateKey = getPrivateKey(privateKeyString); //解密 cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[]deBytes = cipher.doFinal(enBytes); publicKeyString = getKeyString(publicKey); System.out.println("public:n" +publicKeyString); privateKeyString = getKeyString(privateKey); System.out.println("private:n" + privateKeyString); String s = new String(deBytes); System.out.println(s); } 通过modulus public exponent private exponent生成 RSA Key public class RsaKey { public PublicKey getPublicKey(String modulus,String publicExponent) throws Exception { BigInteger m = new BigInteger(modulus); BigInteger e = new BigInteger(publicExponent); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(m,e); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(keySpec); return publicKey; } public PrivateKey getPrivateKey(String modulus,String privateExponent) throws Exception { BigInteger m = new BigInteger(modulus); BigInteger e = new BigInteger(privateExponent); RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m,e); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(keySpec); return privateKey; } public static void main(String[] args) throws Exception { String modulus = "10103166745709600780215616551837697832816413714471062522342538060943596036859967333870827790358555455232243383580565187280643159050869924436081447583051139"; String publicExponent = "65537"; String privateExponet = "367979294475011322800474185715497882523349856362702385535371444397399388741997039894583483410120364529325888461124714276674612930833020362278754665756193"; RsaKey key = new RsaKey(); PublicKey publicKey = key.getPublicKey(modulus, publicExponent); PrivateKey privateKey = key.getPrivateKey(modulus, privateExponet); //加解密类 Cipher cipher = Cipher.getInstance("RSA"); //明文 byte[] plainText = "我们都很好!邮件:@sina.com".getBytes(); //加密 cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] enBytes = cipher.doFinal(plainText); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[]deBytes = cipher.doFinal(enBytes); String s = new String(deBytes); System.out.println(s); |
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