JAVA RSA加密公私钥
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RSA加密算法:RSA加密算法是一种非对称加密算法。解密者拥有私钥,并且将由私钥计算生成的公钥发布给加密者。加密都使用公钥进行加密,并将密文发送到解密者,解密者用私钥解密将密文解码为明文。
import org.apache.commons.codec.binary.Base64; import javax.crypto.Cipher; import java.math.BigInteger; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.RSAPrivateKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.HashMap; import java.util.Map; public class RSAEncrypt { private static Map<String, String> keyMap = new HashMap<String, String>(); //用于封装随机产生的公钥与私钥 private static Map<String, BigInteger> modMap = new HashMap<>(); public static void main(String[] args) throws Exception { //生成公钥和私钥 genKeyPair(); //加密字符串 String message = "license"; System.out.println("随机生成的公钥为:" + keyMap.get("publicKeyString")); System.out.println("随机生成的私钥为:" + keyMap.get("privateKeyString")); String messageEn = encrypt(message,keyMap.get("publicKeyString"));//公钥加密 System.out.println(message + " 加密后的字符串为:" + messageEn); String messageDe = decrypt(messageEn,keyMap.get("privateKeyString"));//私钥解密 System.out.println("decrypt还原后的字符串为:" + messageDe); String messageDeMod = decryptMod(messageEn,modMap.get("privateMod"), modMap.get("privatePub")); System.out.println("decryptMod还原后的字符串为:" + messageDeMod); String messageDeModStr = decryptModStr(messageEn,keyMap.get("privateModStr"), keyMap.get("privatePubStr")); System.out.println("decryptModStr还原后的字符串为:" + messageDeModStr); } /** * 随机生成密钥对 * @throws NoSuchAlgorithmException */ public static void genKeyPair() throws NoSuchAlgorithmException { // KeyPairGenerator类用于生成公钥和私钥对,基于RSA算法生成对象 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); // 初始化密钥对生成器,密钥大小为96-1024位 keyPairGen.initialize(1024,new SecureRandom()); // 生成一个密钥对,保存在keyPair中 KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥 RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥 String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded())); // 得到私钥字符串 String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded()))); // 将公钥和私钥保存到Map keyMap.put("publicKeyString",publicKeyString); keyMap.put("privateKeyString",privateKeyString); String publicModStr = new String(Base64.encodeBase64((publicKey.getModulus().toByteArray()))); String publicPubStr = new String(Base64.encodeBase64((publicKey.getPublicExponent().toByteArray()))); String privateModStr = new String(Base64.encodeBase64((privateKey.getModulus().toByteArray()))); String privatePubStr = new String(Base64.encodeBase64((privateKey.getPrivateExponent().toByteArray()))); keyMap.put("publicModStr",publicModStr); keyMap.put("publicPubStr",publicPubStr); keyMap.put("privateModStr",privateModStr); keyMap.put("privatePubStr",privatePubStr); modMap.put("publicMod", publicKey.getModulus()); modMap.put("publicPub", publicKey.getPublicExponent()); modMap.put("privateMod", privateKey.getModulus()); modMap.put("privatePub", privateKey.getPrivateExponent()); System.out.println("publicModStr:"+publicModStr); System.out.println("publicPubStr:"+publicPubStr); System.out.println("publicMod:"+publicKey.getModulus()); System.out.println("publicPub:"+publicKey.getPublicExponent()); System.out.println("privateModStr:"+privateModStr); System.out.println("privatePubStr:"+privatePubStr); System.out.println("privateMod:"+privateKey.getModulus()); System.out.println("privatePub:"+privateKey.getPrivateExponent()); } /** * RSA公钥加密 * * @param str * 加密字符串 * @param publicKey * 公钥 * @return 密文 * @throws Exception * 加密过程中的异常信息 */ public static String encrypt( String str, String publicKey ) throws Exception{ //base64编码的公钥 byte[] decoded = Base64.decodeBase64(publicKey); RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded)); //RSA加密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8"))); return outStr; } /** * RSA私钥解密 * * @param str * 加密字符串 * @param privateKey * 私钥 * @return 铭文 * @throws Exception * 解密过程中的异常信息 */ public static String decrypt(String str, String privateKey) throws Exception{ //64位解码加密后的字符串 byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8")); //base64编码的私钥 byte[] decoded = Base64.decodeBase64(privateKey); RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded)); //RSA解密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, priKey); String outStr = new String(cipher.doFinal(inputByte)); return outStr; } /** * RSA私钥解密 * * @param str * 加密字符串 * @param privateKey * 私钥 * @return 铭文 * @throws Exception * 解密过程中的异常信息 */ public static String decryptMod(String str, BigInteger privateMod, BigInteger privatePub) throws Exception{ //64位解码加密后的字符串 byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8")); RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(privateMod, privatePub); RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(priKeySpec); //RSA解密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, priKey); String outStr = new String(cipher.doFinal(inputByte)); return outStr; } /** * RSA私钥解密 * * @param str * 加密字符串 * @param privateKey * 私钥 * @return 铭文 * @throws Exception * 解密过程中的异常信息 */ public static String decryptModStr(String str, String privateModStr, String privatePubStr) throws Exception{ //64位解码加密后的字符串 byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8")); BigInteger privateMod = new BigInteger(Base64.decodeBase64(privateModStr)); BigInteger privatePub = new BigInteger(Base64.decodeBase64(privatePubStr)); RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(privateMod, privatePub); RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(priKeySpec); //RSA解密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, priKey); String outStr = new String(cipher.doFinal(inputByte)); return outStr; } }
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