大橙子网站建设,新征程启航
为企业提供网站建设、域名注册、服务器等服务
java8中怎么实现Rsa加解密和签名验签,相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
巴林右旗ssl适用于网站、小程序/APP、API接口等需要进行数据传输应用场景,ssl证书未来市场广阔!成为创新互联的ssl证书销售渠道,可以享受市场价格4-6折优惠!如果有意向欢迎电话联系或者加微信:028-86922220(备注:SSL证书合作)期待与您的合作!
直接上码
package util; import java.io.ByteArrayOutputStream; import java.io.UnsupportedEncodingException; import java.security.*; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.Base64; import java.util.HashMap; import java.util.Map; import javax.crypto.Cipher; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class RsaUtil { /** * RSA算法 */ public static final String KEY_ALGORITHM_RSA = "RSA"; /** * Map获取公钥的键 */ private static final String PUBLIC_KEY = "RSAPublicKey"; /** * Map获取私钥的键 */ private static final String PRIVATE_KEY = "RSAPrivateKey"; /** * 签名算法: MD5withRSA */ public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; /** * RSA最大加密明文大小 */ private static final int MAX_ENCRYPT_BLOCK = 117; /** * RSA最大解密密文大小 */ private static final int MAX_DECRYPT_BLOCK = 256; //获得公钥字符串 public static String getPublicKeyStr(MapkeyMap) throws Exception { //获得map中的公钥对象 转为key对象 Key key = (Key) keyMap.get(PUBLIC_KEY); //编码返回字符串 return encryptBASE64(key.getEncoded()); } //获得私钥字符串 public static String getPrivateKeyStr(Map keyMap) throws Exception { //获得map中的私钥对象 转为key对象 Key key = (Key) keyMap.get(PRIVATE_KEY); //编码返回字符串 return encryptBASE64(key.getEncoded()); } /** * 获取公钥 * @param key base64编码后公钥 * @return * @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(KEY_ALGORITHM_RSA); return keyFactory.generatePublic(keySpec); } /** * 获取私钥 * * @param key base64编码后私钥 * @return * @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(KEY_ALGORITHM_RSA); return keyFactory.generatePrivate(keySpec); } // base64解码返回byte public static byte[] decryptBASE64(String key) throws Exception { return (new BASE64Decoder()).decodeBuffer(key); } // base64编码返回字符串 public static String encryptBASE64(byte[] key) throws Exception { return (new BASE64Encoder()).encodeBuffer(key); } // 签名 public static byte[] sign(byte[] data, String privateKeyStr) throws Exception { PrivateKey priK = getPrivateKey(privateKeyStr); Signature sig = Signature.getInstance(SIGNATURE_ALGORITHM); sig.initSign(priK); sig.update(data); return sig.sign(); } // 验证签名 public static boolean verify(byte[] data, byte[] sign, String publicKeyStr) throws Exception { PublicKey pubK = getPublicKey(publicKeyStr); Signature sig = Signature.getInstance(SIGNATURE_ALGORITHM); sig.initVerify(pubK); sig.update(data); return sig.verify(sign); } // 初始化公钥私钥 public static Map initKey() throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM_RSA); // 初始化密钥对生成器,密钥大小为96-1024位 keyPairGen.initialize(1024); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); Map keyMap = new HashMap (2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } // 加密 public static byte[] encrypt(byte[] plainText, String publicKeyStr) throws Exception { PublicKey publicKey = getPublicKey(publicKeyStr); Cipher cipher = Cipher.getInstance(KEY_ALGORITHM_RSA); cipher.init(Cipher.ENCRYPT_MODE, publicKey); int inputLen = plainText.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; int i = 0; byte[] cache; while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(plainText, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(plainText, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptText = out.toByteArray(); out.close(); return encryptText; } // 解密 public static byte[] decrypt(byte[] encryptText, String privateKeyStr) throws Exception { PrivateKey privateKey = getPrivateKey(privateKeyStr); Cipher cipher = Cipher.getInstance(KEY_ALGORITHM_RSA); cipher.init(Cipher.DECRYPT_MODE, privateKey); int inputLen = encryptText.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段解密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_DECRYPT_BLOCK) { cache = cipher.doFinal(encryptText, offSet, MAX_DECRYPT_BLOCK); } else { cache = cipher.doFinal(encryptText, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_DECRYPT_BLOCK; } byte[] plainText = out.toByteArray(); out.close(); return plainText; } public static void main(String[] args) { Map keyMap; byte[] cipherText; String input = "Hello World! 您好 世界!!"; try { keyMap = initKey(); String publicKey = getPublicKeyStr(keyMap); System.out.println("公钥------------------"); System.out.println(publicKey); String privateKey = getPrivateKeyStr(keyMap); System.out.println("私钥------------------"); System.out.println(privateKey); System.out.println("测试可行性-------------------"); System.out.println("明文=======" + input); cipherText = encrypt(input.getBytes(), publicKey); //加密后的东西 System.out.println("密文=======" + new String(cipherText)); //开始解密 byte[] plainText = decrypt(cipherText, privateKey); System.out.println("解密后明文===== " + new String(plainText)); System.out.println("验证签名-----------"); String str = "被签名的内容"; System.out.println("\n原文:" + str); byte[] signature = sign(str.getBytes(), privateKey); boolean status = verify(str.getBytes(), signature, publicKey); System.out.println("验证情况:" + status); } catch (Exception e) { e.printStackTrace(); } } }
看完上述内容,你们掌握java8中怎么实现Rsa加解密和签名验签的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注创新互联行业资讯频道,感谢各位的阅读!