RSA加密JAVA实现+sun.misc.BASE64Decoder.jar

package com.test; import java.math.BigInteger; import java.security.KeyFactory; import java.security.PrivateKey; import java.security.PublicKey; import java.security.spec.RSAPrivateKeySpec; import java.security.spec.RSAPublicKeySpec; import javax.crypto.Cipher; import Decoder.BASE64Decoder; import Decoder.BASE64Encoder; /** * Rsa加密解密工具类，需加入sun.misc.BASE64Decoder.jar * 加入sun.misc.BASE64Decoder.jar 是为了让加密结果更好传输，也可以不加 * * * @author 枫jk * */ public class RsaKey { String modulus; Cipher cipher; public RsaKey(String modulus) { this.modulus = modulus; try { //若用Cipher.getInstance("RSA");在android端加密，在服务端解密会报错。 //原因网友解释为：android系统的RSA实现是“RSA/ECB/NoPadding”，而标准JDK实现是“RSA/None/PKCS1Padding”，这造成了在android机上加密后无法在服务器上解密的原因 //所以指定一种形式的RSA就可以了。 cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 获取加密公匙 * @param modulus * @param publicExponent * @return * @throws Exception */ 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; } /** * 获取加密私匙 * @param modulus * @param privateExponent * @return * @throws Exception */ 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; } /** * 得到加密串 * @param text * @param publicExponent * @return */ public String getEnRsa(String text,String publicExponent) { String str = null; try { PublicKey publicKey = getPublicKey(modulus, publicExponent); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] enBytes = cipher.doFinal(text.getBytes()); str = (new BASE64Encoder()).encode(enBytes); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return str; } /** * 解密得到原文 * @param text * @param privateExponet * @return */ public String getDeRsa(String text,String privateExponet) { String str = null; try { PrivateKey privateKey = getPrivateKey(modulus, privateExponet); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] enBytes = (new BASE64Decoder()).decodeBuffer(text); byte[] deBytes = cipher.doFinal(enBytes); str = new String(deBytes); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return str; } }