代码是网上抄的，自己练练手
RSA加密
package com.answern.openplatform; import org.apache.commons.codec.binary.Base64; import org.junit.Test; import javax.crypto.Cipher; import java.io.File; import java.math.BigInteger; import java.nio.charset.Charset; import java.security.*; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.HashMap; import java.util.Map; /** * *--------------------------------------------**********-------------------------------------------- *该算法于1977年由美国麻省理工学院MIT(Massachusetts Institute of Technology)的Ronal Rivest，Adi Shamir和Len Adleman三位年轻教授提出，并以三人的姓氏Rivest，Shamir和Adlernan命名为RSA算法，是一个支持变长密钥的公共密钥算法，需要加密的文件快的长度也是可变的! *所谓RSA加密算法，是世界上第一个非对称加密算法，也是数论的第一个实际应用。它的算法如下： *1.找两个非常大的质数p和q（通常p和q都有155十进制位或都有512十进制位）并计算n=pq，k=(p-1)(q-1)。 *2.将明文编码成整数M，保证M不小于0但是小于n。 *3.任取一个整数e，保证e和k互质，而且e不小于0但是小于k。加密钥匙（称作公钥）是(e,n)。 *4.找到一个整数d，使得ed除以k的余数是1（只要e和n满足上面条件，d肯定存在）。解密钥匙（称作密钥）是(d,n)。 *加密过程： 加密后的编码C等于M的e次方除以n所得的余数。 *解密过程： 解密后的编码N等于C的d次方除以n所得的余数。 *只要e、d和n满足上面给定的条件。M等于N。 *--------------------------------------------**********-------------------------------------------- * RAS 加密算法测试 * @Author 冯浩 * @Description * @Date: create in 15:14 2018/5/24 * @Modified by */ public class RSATest { private final static int KEYSIZE = 1024; private final static String RSA = "RSA"; public static final String RSA_ALGORITHM = "RSA/ECB/PKCS1Padding"; public Map<String,Object> generotor() throws Exception{ SecureRandom sr =new SecureRandom(); KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(KEYSIZE,sr); KeyPair keyPair = keyPairGenerator.generateKeyPair(); Key pub = keyPair.getPublic(); byte[] pubByte = pub.getEncoded(); String publicKey = new String(pubByte,Charset.forName("UTF-8")); Key pri = keyPair.getPrivate(); byte[] priByte = pri.getEncoded(); String privateKey = new String(priByte,Charset.forName("UTF-8")); RSAPublicKey pubKey = (RSAPublicKey)keyPair.getPublic(); BigInteger modulus = pubKey.getModulus(); byte[] modulu = modulus.toByteArray(); byte[] baseModulu = Base64.encodeBase64(modulu); String mo = new String(baseModulu,Charset.forName("UTF-8")); Map<String,Object> data = new HashMap<String,Object>(); data.put("public",publicKey); data.put("private",privateKey); data.put("module",mo); return data; } /** * 获取公钥信息 * @param key * @return * @throws Exception */ public PublicKey getPublicKey(String key) throws Exception{ X509EncodedKeySpec spec = new X509EncodedKeySpec(Base64.decodeBase64(key.getBytes())); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(spec); return publicKey; } /** * 获取私钥信息 * @param key * @return * @throws Exception */ public PrivateKey getPrivateKey(String key) throws Exception{ X509EncodedKeySpec spec = new X509EncodedKeySpec(Base64.decodeBase64(key.getBytes())); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(spec); return privateKey; } /** * 加密 * @param source * @param publicKey * @return * @throws Exception */ public String encrypt(String source,String publicKey) throws Exception{ Key key = getPublicKey(publicKey); Cipher cipher = Cipher.getInstance(RSA_ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE,key); byte[] bytes = source.getBytes(); byte[] b = cipher.doFinal(bytes); return new String(b,Charset.forName("utf-8")); } /** * 解密 * @param cypt * @param key * @return * @throws Exception */ public String decrypt(String cypt,String key) throws Exception{ Key privateKey = getPrivateKey(key); Cipher cipher = Cipher.getInstance(RSA_ALGORITHM); cipher.init(Cipher.DECRYPT_MODE,privateKey); byte[] so = Base64.decodeBase64(cypt.getBytes()); byte[] b= cipher.doFinal(so); return new String(b); } /** * 生成签名 * @param content * @param privateKey * @return * @throws Exception */ public String sign(String content,String privateKey) throws Exception{ String charset = "UTF-8"; PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(content.getBytes())); KeyFactory keyFactory = KeyFactory.getInstance(RSA); PrivateKey priKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); Signature signature = Signature.getInstance("SHA1WithRSA"); signature.initSign(priKey); signature.update(content.getBytes(charset)); byte[] sign = signature.sign(); return new String(Base64.encodeBase64(sign)); } public void checkSign(String content,String sign,String publicKey) { try { KeyFactory keyFactory = KeyFactory.getInstance(RSA); byte[] decode = Base64.decodeBase64(publicKey); PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(decode)); Signature signature = Signature.getInstance("SHA1WithRSA"); signature.initVerify(pubKey); signature.update(content.getBytes("UTF-8")); boolean verify = signature.verify(Base64.decodeBase64(sign)); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { RSATest test = new RSATest(); int result = test.test(); System.out.println(result); } public int test(){ int a=1; try { return a++; }catch (Exception e){ e.printStackTrace(); }finally { System.out.println("1"+a); return a++; } } }
AES加密
package com.answern.openplatform.app.utils; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; /** * @Author 冯浩 * @Description * @Date: create in 17:06 2018/5/24 * @Modified by */ public class AESUtils { public final static String AES = "AES"; public static final String AES_ALGORITHM = "AES/ECB/PKCS5Padding"; /** * 加密 * @param data * @param key * @return */ public static byte[] encrypt(byte[] data,byte[] key){ if(key.length!=16){ throw new RuntimeException("Invalid AES key length (must be 16 bytes)"); } try { SecretKeySpec secretKeySpec = new SecretKeySpec(key,AES); byte[] bytes = secretKeySpec.getEncoded(); SecretKeySpec secKey = new SecretKeySpec(bytes,AES); Cipher cipher = Cipher.getInstance(AES_ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE,secKey); byte[] result = cipher.doFinal(data); return result; }catch (Exception e){ throw new RuntimeException("encrypt fail!",e); } } /** * 解密 * @param data * @param key * @return */ public static byte[] decyypt(byte[] data,byte[] key){ if(key.length!=16){ throw new RuntimeException("Invalid AES key length (must be 16 bytes)"); } try { SecretKeySpec secretKeySpec = new SecretKeySpec(key,AES); byte[] bytes = secretKeySpec.getEncoded(); SecretKeySpec secKey = new SecretKeySpec(bytes,AES); Cipher cipher = Cipher.getInstance(AES_ALGORITHM); cipher.init(Cipher.DECRYPT_MODE,secKey); byte[] result = cipher.doFinal(data); return result; }catch (Exception e){ throw new RuntimeException("encrypt fail!",e); } } public static void main(String[] args) { String message = "大家"; String key = "1111111111111111"; byte[] result = AESUtils.encrypt(message.getBytes(),key.getBytes()); System.out.println("***********************"); byte[] abs = AESUtils.decyypt(result,key.getBytes()); System.out.println(new String(abs)); } }