All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.alan344happyframework.util.RSAUtils Maven / Gradle / Ivy

package com.alan344happyframework.util;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

/**
 * 

* RSA公钥/私钥/签名工具包 *

*

* 罗纳德·李维斯特(Ron [R]ivest)、阿迪·萨莫尔(Adi [S]hamir)和伦纳德·阿德曼(Leonard [A]dleman) *

*

* 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式
* 由于非对称加密速度极其缓慢,一般文件不使用它来加密而是使用对称加密,
* 非对称加密算法可以用来对对称加密的密钥加密,这样保证密钥的安全也就保证了数据的安全 *

* * @author IceWee * @version 1.0 * @date 2012-4-26 */ public class RSAUtils { /** * 加密算法RSA */ public static final String KEY_ALGORITHM = "RSA"; /** * 签名算法 */ public static final String SIGNATURE_ALGORITHM_MD5 = "MD5withRSA"; /** * SHA1签名算法 */ public static final String SIGNATURE_ALGORITHM_SHA1 = "SHA1WithRSA"; /** * 获取公钥的key */ private static final String PUBLIC_KEY = "RSAPublicKey"; /** * 获取私钥的key */ private static final String PRIVATE_KEY = "RSAPrivateKey"; /** * 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 = 128; /** *

* 用私钥生成数字签名 *

* * @param data 已加密数据 * @param privateKey 私钥(BASE64编码) * @return str * @throws Exception e */ public static String sign(byte[] data, String privateKey, String signatureAlgorithm) throws Exception { byte[] keyBytes = Base64.getDecoder().decode(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec); Signature signature = Signature.getInstance(signatureAlgorithm); signature.initSign(privateK); signature.update(data); return Base64.getEncoder().encodeToString(signature.sign()); } /** *

* 使用公钥校验数字签名 *

* * @param data 已加密数据 * @param publicKey 公钥(BASE64编码) * @param sign 数字签名 * @return true: success * @throws Exception e */ public static boolean verify(byte[] data, String publicKey, String sign, String signatureAlgorithm) throws Exception { byte[] keyBytes = Base64.getDecoder().decode(publicKey); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PublicKey publicK = keyFactory.generatePublic(keySpec); Signature signature = Signature.getInstance(signatureAlgorithm); signature.initVerify(publicK); signature.update(data); return signature.verify(Base64.getDecoder().decode(sign)); } /** *

* 私钥解密 *

* * @param encryptedData 已加密数据 * @param privateKey 私钥(BASE64编码) * @return 解密后的二进制 * @throws Exception e */ public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception { byte[] keyBytes = Base64.getDecoder().decode(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key privateK = keyFactory.generatePrivate(pkcs8KeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, privateK); int inputLen = encryptedData.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(encryptedData, offSet, MAX_DECRYPT_BLOCK); } else { cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_DECRYPT_BLOCK; } byte[] decryptedData = out.toByteArray(); out.close(); return decryptedData; } /** *

* 公钥解密 *

* * @param encryptedData 已加密数据 * @param publicKey 公钥(BASE64编码) * @return 解密后的二进制 * @throws Exception e */ public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception { byte[] keyBytes = Base64.getDecoder().decode(publicKey); X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key publicK = keyFactory.generatePublic(x509KeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, publicK); int inputLen = encryptedData.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(encryptedData, offSet, MAX_DECRYPT_BLOCK); } else { cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_DECRYPT_BLOCK; } byte[] decryptedData = out.toByteArray(); out.close(); return decryptedData; } /** *

* 公钥加密 *

* * @param data 源数据 * @param publicKey 公钥(BASE64编码) * @return 加密后的二进制 * @throws Exception e */ public static byte[] encryptByPublicKey(byte[] data, String publicKey, String algorithm) throws Exception { byte[] keyBytes = org.apache.commons.codec.binary.Base64.decodeBase64(publicKey); X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key publicK = keyFactory.generatePublic(x509KeySpec); // 对数据加密 Cipher cipher = Cipher.getInstance(algorithm); cipher.init(Cipher.ENCRYPT_MODE, publicK); int inputLen = data.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段加密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(data, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptedData = out.toByteArray(); out.close(); return encryptedData; } /** * 公钥加密 to String * * @param data 待加密数据 * @param publicKey 公钥 * @return 已加密数据 * @throws Exception e */ public static String encryptByPublicKeyToString(byte[] data, String publicKey, String algorithm) throws Exception { return Base64.getEncoder().encodeToString(encryptByPublicKey(data, publicKey, algorithm)); } /** *

* 私钥加密 *

* * @param data 源数据 * @param privateKey 私钥(BASE64编码) * @return 加密后的二进制 * @throws Exception e */ public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception { byte[] keyBytes = org.apache.commons.codec.binary.Base64.decodeBase64((privateKey)); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key privateK = keyFactory.generatePrivate(pkcs8KeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, privateK); // String bytes = Base64.getEncoder().encodeToString(cipher.doFinal(data)); int inputLen = data.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段加密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(data, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptedData = out.toByteArray(); out.close(); return encryptedData; } /** *

* 生成密钥对(公钥和私钥) *

* * @return map * @throws Exception e */ public static Map genKeyPair() throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); 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; } /** * 获取私钥 *

* * @param keyMap 密钥对 * @return 私钥 */ public static String getPrivateKey(Map keyMap) { Key key = (Key) keyMap.get(PRIVATE_KEY); return Base64.getEncoder().encodeToString(key.getEncoded()); } /** * 获取公钥 *

* * @param keyMap 密钥对 * @return 公钥 */ public static String getPublicKey(Map keyMap) { Key key = (Key) keyMap.get(PUBLIC_KEY); return Base64.getEncoder().encodeToString(key.getEncoded()); } public static void main(String[] args) throws Exception { // Map objectMap = genKeyPair(); // String privateKey = getPrivateKey(objectMap); // String publicKey = getPublicKey(objectMap); // String sign = sign("dd".getBytes(), privateKey, SIGNATURE_ALGORITHM_SHA1); // String dd1 = Base64.getEncoder().encodeToString(encryptByPrivateKey("dd".getBytes(), privateKey)); // byte[] bytes = encryptByPublicKey("hah".getBytes(), publicKey); // byte[] bytes1 = decryptByPrivateKey(bytes, privateKey); // String sd = new String(bytes1); String publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArT82k67xybiJS9AD8nNA\n" + "euDYdrtCRaxkS6cgs8L9h83eqlDTlrdwzBVSv5V4imTq/URbXn4K0V/KJ1TwDrqO\n" + "I8hamGB0fvU13WW1NcJuv41RnJVua0QAlS3tS1JzOZpMS9BEGeFvyFF/epbi/m9+\n" + "lkUWG94FccArNnBtBqqvFncXgQsm98JB3a42NbS1ePP/hMI7Kkz+JNMyYsWkrOUF\n" + "DCXAbSZkWBJekY4nGZtK1erqGRve8JbxTWirAm/s08rUrjOuZFA21/EI2nea3Did\n" + "JMTVnXVPY2qcAjF+595shwUKyTjKB8v1REPB3hPF1Z75O6LwuLfyPiCrCTmVoyfq\n" + "jwIDAQAB"; byte[] bytes = encryptByPublicKey("dsd".getBytes(), publicKey, KEY_ALGORITHM); } }




© 2015 - 2025 Weber Informatics LLC | Privacy Policy