MD5及公私钥数据加密工具类

加签验签代码如下：
package com.allinpay.ets.pswd.util;import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.xml.crypto.dsig.CanonicalizationMethod;
import javax.xml.crypto.dsig.DigestMethod;
import javax.xml.crypto.dsig.Reference;
import javax.xml.crypto.dsig.SignatureMethod;
import javax.xml.crypto.dsig.SignedInfo;
import javax.xml.crypto.dsig.Transform;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.crypto.dsig.XMLSignatureFactory;
import javax.xml.crypto.dsig.dom.DOMSignContext;
import javax.xml.crypto.dsig.dom.DOMValidateContext;
import javax.xml.crypto.dsig.spec.C14NMethodParameterSpec;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.RSAPrivateKeyStructure;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/*** 数据加密工具类* * * @date 20180130**/
public class SecurityUtils {/*** 执行初始化操作，将 BouncyCastleProvider添加到java.security.Security中*//** static { Secu rity.addProvider(new BouncyCastleProvider()); }*/private SecurityUtils() {}/*** 对数据做MD5摘要* * @param aData* @return* @throws SecurityException*/public static String MD5Encode(String aData) throws Exception {String resultString = null;MessageDigest md = MessageDigest.getInstance("MD5");resultString = bytes2HexString(md.digest(aData.getBytes("UTF-8")));return resultString;}public static String bytes2HexString(byte[] b) {String ret = "";for (int i = 0; i < b.length; i++) {String hex = Integer.toHexString(b[i] & 0xFF);if (hex.length() == 1) {hex = '0' + hex;}ret += hex.toUpperCase();}return ret;}/*** 获得公钥* * @param modulus* @param publicExponent* @return* @throws Exception*/public static PublicKey getPublicKey(String modulus, String publicExponent)throws Exception {BigInteger m = new BigInteger(modulus, 16);BigInteger e = new BigInteger(publicExponent, 16);RSAPublicKeySpec keySpec = new RSAPublicKeySpec(m, e);KeyFactory keyFactory = KeyFactory.getInstance("RSA",new BouncyCastleProvider());PublicKey publicKey = keyFactory.generatePublic(keySpec);return publicKey;}/*** 从modulus和exponent生成rsa的私钥，要求两个参数都是16进制格式* * @param modulus*            16进制* @param privateExponent*            16进制* @return* @throws Exception* */public static PrivateKey getPrivateKey(String modulus,String privateExponent) throws Exception {BigInteger m = new BigInteger(modulus, 16);BigInteger e = new BigInteger(privateExponent, 16);RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m, e);KeyFactory keyFactory = KeyFactory.getInstance("RSA",new BouncyCastleProvider());PrivateKey privateKey = keyFactory.generatePrivate(keySpec);return privateKey;}/*** 根据alias别名从store文件获得私钥信息* * @param storePath*            store文件地址* @param alias*            别名* @param storePass*            store访问明码* @param storeType*            store类型 为空时为默认值* @return 私钥* @throws Exception*/@Deprecatedpublic static PrivateKey getPrivateKeyFromStore(String storePath,String alias, String storePass, String storeType) throws Exception {// KeyTool中生成KeyStore时设置的alias// alias = "paymentSign";// KeyTool中生成KeyStore时设置的storetype// storeType = "JCEKS";// KeyTool中生成KeyStore时设置的storepasschar[] pw = storePass.toCharArray();// KeyTool中已生成的KeyStore文件// storePath = "C:/app/payment.keystore";storeType = "JCEKS";storeType = null == storeType ? KeyStore.getDefaultType() : storeType;KeyStore keyStore = KeyStore.getInstance(storeType);InputStream is = new FileInputStream(storePath);keyStore.load(is, pw);// 返回私钥return (PrivateKey) keyStore.getKey(alias, pw);}/*** 从keyStore中获取私钥* @param storePath* @param alias* @param storePass* @param storeType* @return* @throws Exception*/public static PrivateKey getPriKeyFromStore(String storePath,String alias, String storePass, String storeType) throws Exception {char[] pw = storePass.toCharArray();if(StringUtils.isEmpty(storeType)){storeType = KeyStore.getDefaultType();}//获得KeyStore对象KeyStore keyStore = KeyStore.getInstance(storeType,new BouncyCastleProvider());//加载KeyStore库InputStream is = new FileInputStream(storePath);keyStore.load(is, pw);// 返回私钥return (PrivateKey) keyStore.getKey(alias, pw);}/*** 从keyStore中获取私钥* @param storePath* @param alias* @param storePass* @param storeType* @return* @throws Exception*/public static PublicKey getPubKeyFromStore(String storePath,String alias, String storePass, String storeType) throws Exception {char[] pw = storePass.toCharArray();if(StringUtils.isEmpty(storeType)){storeType = KeyStore.getDefaultType();}//获得KeyStore对象KeyStore keyStore = KeyStore.getInstance(storeType);//加载KeyStore库InputStream is = new FileInputStream(storePath);keyStore.load(is, pw);// 返回公钥return keyStore.getCertificate(alias).getPublicKey();}/*** 从keyStore中获取证书Id* @param storePath* @param alias* @param storePass* @param storeType* @return* @throws Exception*/public static String getCertIdFromStore(String storePath,String alias, String storePass, String storeType) throws Exception {char[] pw = storePass.toCharArray();if(null == storeType){storeType = KeyStore.getDefaultType();}//获得KeyStore对象KeyStore keyStore = KeyStore.getInstance(storeType,new BouncyCastleProvider());//加载KeyStore库InputStream is = new FileInputStream(storePath);keyStore.load(is, pw);// 返回证书X509Certificate cert = (X509Certificate) keyStore.getCertificate(alias);return cert.getSerialNumber().toString();}/*** 从keyStore中获取证书Encode* @param storePath* @param alias* @param storePass* @param storeType* @return* @throws Exception*/public static byte[] getEncodeFromStore(String storePath,String alias, String storePass, String storeType) throws Exception {char[] pw = storePass.toCharArray();if(null == storeType){storeType = KeyStore.getDefaultType();}//获得KeyStore对象KeyStore keyStore = KeyStore.getInstance(storeType,new BouncyCastleProvider());//加载KeyStore库InputStream is = new FileInputStream(storePath);keyStore.load(is, pw);// 返回证书X509Certificate cert = (X509Certificate) keyStore.getCertificate(alias);return cert.getEncoded();}/*** 用私钥对数据签名,签名算法: SHA1withRSA* * @param src*            明文数据* @param privateKey*            私钥对象 可直接使用* @return 加密后密文* @throws SecurityException*/public static String signByRSAwithSHA1(String src, PrivateKey priKey)throws NoSuchAlgorithmException, InvalidKeyException,SignatureException, SecurityException {Security.addProvider(new BouncyCastleProvider());Signature sigEng = Signature.getInstance("SHA1withRSA");sigEng.initSign(priKey);sigEng.update(src.getBytes());byte[] signature = sigEng.sign();String signMsg = CodeUtil.bytes2HexString(signature);return signMsg;}/*** 公钥验证* * @param pubKey* @param srcBytes* @param signBytes* @param signAlg* @return*/public static boolean verifyByPubKey(Key pubKey, byte[] srcBytes,byte[] signBytes, String signAlg) {boolean result = false;try {Signature sign = Signature.getInstance(signAlg,new BouncyCastleProvider());sign.initVerify((PublicKey) pubKey);sign.update(srcBytes);result = sign.verify(signBytes);} catch (NoSuchAlgorithmException e) {// LoggerUtil.error("公钥验签 - 无效算法：");} catch (InvalidKeyException e) {// LoggerUtil.error("公钥验签 - 无效的密钥：");} catch (SignatureException e) {// LoggerUtil.error("公钥验签 - 签名异常：");}return result;}/*** 加签* * @param priKey* @param srcBytes* @param signAlg* @return*/public static byte[] signByPriKey(Key priKey, byte[] srcBytes,String signAlg) {// 签名byte[] signBytes = null;try {Signature sign = Signature.getInstance(signAlg,new BouncyCastleProvider());sign.initSign((PrivateKey) priKey);sign.update(srcBytes);signBytes = sign.sign();} catch (NoSuchAlgorithmException e) {// LoggerUtil.error("私钥签名 - 无效算法：");} catch (InvalidKeyException e) {// LoggerUtil.error("私钥签名 - 无效的密钥：");} catch (SignatureException e) {// LoggerUtil.error("私钥签名 - 签名异常：");}return signBytes;}/*** 加签(Xml)* Xml内部生成Signature标签* * @param priKey* @param srcBytes* @param signAlg* @return* @throws Exception */public static byte[] signXmlByPriKey(Key priKey, byte[] srcBytes) throws Exception {// 签名byte[] signBytes = null;try {DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();dbf.setNamespaceAware(true);Document doc = dbf.newDocumentBuilder().parse(new ByteArrayInputStream(srcBytes));XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");Transform envelopedTransform = factory.newTransform(Transform.ENVELOPED, (TransformParameterSpec) null);DigestMethod digestMethod = factory.newDigestMethod(DigestMethod.SHA1, null);CanonicalizationMethod canonicalizationMethod = factory.newCanonicalizationMethod(CanonicalizationMethod.INCLUSIVE,(C14NMethodParameterSpec) null);SignatureMethod signatureMethod = factory.newSignatureMethod(SignatureMethod.RSA_SHA1, null);Reference ref = factory.newReference("", digestMethod, Collections.singletonList(envelopedTransform), null, null);SignedInfo si = factory.newSignedInfo(canonicalizationMethod,signatureMethod, Collections.singletonList(ref));XMLSignature signature = factory.newXMLSignature(si, null);DOMSignContext domSignContext = new DOMSignContext(priKey, doc.getDocumentElement());signature.sign(domSignContext);TransformerFactory transformerFactory = TransformerFactory.newInstance();Transformer transformer = transformerFactory.newTransformer();transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");ByteArrayOutputStream outputStream = new ByteArrayOutputStream();StreamResult streamResult = new StreamResult(outputStream);transformer.transform(new DOMSource(doc), streamResult);signBytes =  outputStream.toByteArray();}catch (Exception e) {throw e;}return signBytes;}/*** 使用公钥，对传入的XML进行校验，如果校验成功，返回true，否则，返回false。* 在校验的过程中，会将XML原文加载为DOM对象，在DOM中优先寻找签名元素，如果没有找到或者数量不止1个，则直接返回false。* * @param inputBytes*            XML报文的bytes* @param pubKey*            公钥对象* @return 校验结果，成功：true，失败：false* @throws Exception*/public static boolean verifyXmlByPubKey(byte[] inputBytes, PublicKey pubKey)throws Exception {try {DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();dbf.setNamespaceAware(true);InputStream inputStream = new ByteArrayInputStream(inputBytes);Document document = dbf.newDocumentBuilder().parse(inputStream);/** 从XML原文中，找到签名报文元素。* 如果找不到该节点，或者该节点的数量不为1，直接返回false。*/Node signatureNode = null;NodeList childNodes = document.getElementsByTagNameNS(XMLSignature.XMLNS,"Signature");if (childNodes.getLength() == 1) {signatureNode = childNodes.item(0);} else if (childNodes.getLength() == 0) {return false;} else {return false;}DOMValidateContext valContext = new DOMValidateContext(pubKey,signatureNode);XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");XMLSignature signature = factory.unmarshalXMLSignature(valContext);if (!signature.validate(valContext)) {return false;} else {return true;}} catch (Exception e) {throw e;}}/*** 私钥解密过程* * @param privateKey*            私钥* @param cipherData*            密文数据* @return 明文* @throws Exception*             解密过程中的异常信息*/public static byte[] decryptByPriKey(PrivateKey privateKey,byte[] cipherData) throws Exception {byte[] output = null;if (privateKey == null) {throw new Exception("解密私钥为空, 请设置");}Cipher cipher = null;try {// 使用默认RSAcipher = Cipher.getInstance("RSA");// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());cipher.init(Cipher.DECRYPT_MODE, privateKey);output = cipher.doFinal(cipherData);} catch (NoSuchAlgorithmException e) {// throw new Exception("无此解密算法");} catch (NoSuchPaddingException e) {// e.printStackTrace();// return null;} catch (InvalidKeyException e) {// throw new Exception("解密私钥非法,请检查");} catch (IllegalBlockSizeException e) {// throw new Exception("密文长度非法");} catch (BadPaddingException e) {// throw new Exception("密文数据已损坏");}return output;}/*** 私钥解密过程* * @param privateKey*            私钥* @param cipherData*            密文数据* @return 明文* @throws Exception*             解密过程中的异常信息*/public static byte[] encryptByPubKey(PublicKey publicKey,byte[] cipherData) throws Exception {byte[] output = null;if (publicKey == null) {throw new Exception("加密公钥为空, 请设置");}Cipher cipher = null;try {// 使用默认RSAcipher = Cipher.getInstance("RSA");// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());cipher.init(Cipher.ENCRYPT_MODE, publicKey);output = cipher.doFinal(cipherData);} catch (NoSuchAlgorithmException e) {// throw new Exception("无此解密算法");} catch (NoSuchPaddingException e) {// e.printStackTrace();// return null;} catch (InvalidKeyException e) {// throw new Exception("解密私钥非法,请检查");} catch (IllegalBlockSizeException e) {throw new Exception("密文长度非法");} catch (BadPaddingException e) {// throw new Exception("密文数据已损坏");}return output;}/** * 从文件中输入流中加载公钥 * @param in 公钥输入流 * @throws Exception 加载公钥时产生的异常 */  public static PublicKey loadPublicKey(InputStream in) throws Exception{  try {  BufferedReader br= new BufferedReader(new InputStreamReader(in));  String readLine= null;  StringBuilder sb= new StringBuilder();  while((readLine= br.readLine())!=null){  if(readLine.charAt(0)=='-'){  continue;  }else{  sb.append(readLine);  sb.append('\r');  }  }  return loadPublicKey(sb.toString());  } catch (IOException e) {  throw new Exception("公钥数据流读取错误");  } catch (NullPointerException e) {  throw new Exception("公钥输入流为空");  } catch (Exception e) {  throw e;  }  }  /** * 从文件中加载私钥 * @param in 私钥输入流  * @param pkcs PKCS标准* @return 是否成功 * @throws Exception  */  public static PrivateKey loadPrivateKey(InputStream in,String pkcs) throws Exception{  try {  BufferedReader br= new BufferedReader(new InputStreamReader(in));  String readLine= null;  StringBuilder sb= new StringBuilder();  while((readLine= br.readLine())!=null){  if(readLine.charAt(0)=='-'){  continue;  }else{  sb.append(readLine);  sb.append('\r');  }  }  if("PKCS1".equals(pkcs)){return loadPrivateKeyWithPcks1(sb.toString()); }else if("PKCS8".equals(pkcs)){return loadPrivateKeyWithPcks8(sb.toString());  }else{return loadPrivateKeyWithPcks1(sb.toString());  //默认}} catch (IOException e) {  throw new Exception("私钥数据读取错误");  } catch (NullPointerException e) {  throw new Exception("私钥输入流为空");  } catch (Exception e) {  throw e;  }  }  /***  载入私钥 PKCS8* @param privateKeyStr* @return* @throws Exception*/public static  PrivateKey loadPrivateKeyWithPcks8(String privateKeyStr) throws Exception{try {  byte[] buffer= Base64.decode(privateKeyStr);PKCS8EncodedKeySpec keySpec= new PKCS8EncodedKeySpec(buffer);  KeyFactory keyFactory= KeyFactory.getInstance("RSA");  return  (RSAPrivateKey) keyFactory.generatePrivate(keySpec);  } catch (NoSuchAlgorithmException e) {  throw new Exception("无此算法");  } catch (NullPointerException e) {  throw new Exception("私钥数据为空");  } catch (Exception e) {  throw e;  }  }/***  载入私钥 PKCS1* @param privateKeyStr* @return* @throws Exception*/public static RSAPrivateKey loadPrivateKeyWithPcks1(String privateKeyStr) throws Exception{try {byte[] buffer= Base64.decode(privateKeyStr);RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure((ASN1Sequence)ASN1Sequence.fromByteArray(buffer));RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(), asn1PrivKey.getPrivateExponent());KeyFactory keyFactory= KeyFactory.getInstance("RSA"); return (RSAPrivateKey)keyFactory.generatePrivate(keySpec);} catch (Exception e) {throw e;  }}/***  载入公钥* @param publicKeyKeyStr* @return* @throws Exception*/public static  PublicKey loadPublicKey(String publicKeyKeyStr) throws Exception{try {  byte[] buffer= Base64.decode(publicKeyKeyStr);KeyFactory keyFactory= KeyFactory.getInstance("RSA"); X509EncodedKeySpec keySpec= new X509EncodedKeySpec(buffer);  return (RSAPublicKey) keyFactory.generatePublic(keySpec);  } catch (NoSuchAlgorithmException e) {  throw new Exception("无此算法");  } catch (NullPointerException e) {  throw new Exception("公钥数据为空");  } catch (Exception e) {  throw e;  }  }/*** 把key=value追加到加密/签名字符串最后.* * @param buf* @param key* @param value*/public static void appendSignPara(StringBuffer buf, String key, String value) {if (!StringUtils.isEmpty(value)) {buf.append(key).append('=').append(value).append('&');}}/*** 把key=value追加到加密/签名字符串的末尾.字符串不再继续增加新的key=value.* * @param buf* @param key* @param value*/public static void appendLastSignPara(StringBuffer buf, String key,String value) {if (!StringUtils.isEmpty(value)) {buf.append(key).append('=').append(value);}}/*** key=value排序* * @param map*/public static String orderMap2Str(Map<String, Object> map) {Set<String> keySet = new TreeSet(map.keySet());StringBuilder sb = new StringBuilder();for (String key : keySet) {if (Map.class.isInstance(map.get(key))|| List.class.isInstance(map.get(key))|| StringUtils.isEmpty(String.valueOf(map.get(key)))|| "sign".equals(key)) {continue;}sb.append(key).append("=").append(map.get(key)).append("&");}sb.setLength(sb.length() - 1);return sb.toString();}/*** sha1计算后进行16进制转换* * @param data*            待计算的数据* @param encoding*            编码* @return 计算结果*/public static byte[] sha1X16(String data, String encoding) {byte[] bytes = sha1(data, encoding);StringBuilder sha1StrBuff = new StringBuilder();for (int i = 0; i < bytes.length; i++) {if (Integer.toHexString(0xFF & bytes[i]).length() == 1) {sha1StrBuff.append("0").append(Integer.toHexString(0xFF & bytes[i]));} else {sha1StrBuff.append(Integer.toHexString(0xFF & bytes[i]));}}try {return sha1StrBuff.toString().getBytes(encoding);} catch (UnsupportedEncodingException e) {return null;}}/*** sha1计算* * @param datas*            待计算的数据* @param encoding*            字符集编码* @return*/private static byte[] sha1(String datas, String encoding) {try {return sha1(datas.getBytes(encoding));} catch (UnsupportedEncodingException e) {return null;}}/*** sha1计算.* * @param datas*            待计算的数据* @return 计算结果*/private static byte[] sha1(byte[] data) {MessageDigest md = null;try {md = MessageDigest.getInstance("SHA-1");md.reset();md.update(data);return md.digest();} catch (Exception e) {return null;}}/*** sha256计算后进行16进制转换* * @param data*            待计算的数据* @param encoding*            编码* @return 计算结果*/public static byte[] sha256X16(String data, String encoding) {byte[] bytes = sha256(data, encoding);StringBuilder sha256StrBuff = new StringBuilder();for (int i = 0; i < bytes.length; i++) {if (Integer.toHexString(0xFF & bytes[i]).length() == 1) {sha256StrBuff.append("0").append(Integer.toHexString(0xFF & bytes[i]));} else {sha256StrBuff.append(Integer.toHexString(0xFF & bytes[i]));}}try {return sha256StrBuff.toString().getBytes(encoding);} catch (UnsupportedEncodingException e) {return null;}}/*** sha256计算* * @param datas*            待计算的数据* @param encoding*            字符集编码* @return*/private static byte[] sha256(String datas, String encoding) {try {return sha256(datas.getBytes(encoding));} catch (UnsupportedEncodingException e) {return null;}}/*** sha256计算.* * @param datas*            待计算的数据* @return 计算结果*/private static byte[] sha256(byte[] data) {MessageDigest md = null;try {md = MessageDigest.getInstance("SHA-256");md.reset();md.update(data);return md.digest();} catch (Exception e) {return null;}}/*public static void main(String[] args) {try {FileInputStream privateStream = new FileInputStream("C:\\testPrivate.key");FileInputStream publicKeyStream = new FileInputStream("C:\\testPublic.key");String privateKeyStr = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAqt4f8zgcfdu2w7IS" + "\r" +"6rUyiLIQmOnIDj9HBcFy5NcoBoDpiSJ7txmqBtKO0pANrso6Zu5jIBxcgFC1qZPv" + "\r" +"gsJh6QIDAQABAkAsNnnR94z3zCiIjsVyUhyXXmwJBUUs2pbIGHxgVoQW2kwbTnxw" + "\r" +"I2u7IhGUPpW7duzOxA2Kk1Msr79SX88vKjB5AiEA31WlZZGZxQ/V6o5H0NsUifs/" + "\r" +"OSVWk5N9ofBmqq9WdxMCIQDD2/POZnm0+yBRcdb8ozYIQSkbFdeKqyR5pof5Fso2" + "\r" +"kwIgbQnGt+EvfzvtCBixTXI5A+kMBB2LuH+RHgheR8VVZMsCICQ97CRyQ+0gVv+b" + "\r" +"IBwJm3L1k8SmSwcm2g4Eqb6G4A4vAiEAkV5fULSax5TFW3n5k8FA51YhgGlFeWhy" + "\r" +"q/rDpEC+VrU="+ "\r";String publicKeyKeyStr = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKreH/M4HH3btsOyEuq1MoiyEJjpyA4/" + "\r" +"RwXBcuTXKAaA6Ykie7cZqgbSjtKQDa7KOmbuYyAcXIBQtamT74LCYekCAwEAAQ=="+ "\r";String publicCertUrl = "/app/conf/mchtCert";FileInputStream privateStream = new FileInputStream("C:\\private.key");FileInputStream publicKeyStream = new FileInputStream("C:\\public.key");String signSrc="1111123wwwqq";//签名
//          PrivateKey privateKey = loadPrivateKeyWithPcks8(privateKeyStr);PrivateKey privateKey = loadPrivateKey(privateStream,"PCKS8");String signMac=new String(Base64.encode(signByPriKey(privateKey,signSrc.getBytes(),"MD5WithRSA")));System.out.println(signMac);//验签
//          PublicKey publickey=loadPublicKey(publicKeyKeyStr);PublicKey publickey =loadPublicKey(publicKeyStream);boolean result=verifyByPubKey(publickey,signSrc.getBytes(),Base64.decode(signMac),"MD5WithRSA");System.out.println(result);} catch (Exception e) {e.printStackTrace();}}*/public static void main(String[] args) {String signSrc="merchantId=008310107630117&requestDatetime=203010121820001&signType=4";//签名
//      PrivateKey privateKey = loadPrivateKeyWithPcks8(privateKeyStr);PrivateKey privateKey;try {privateKey = getPrivateKey("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","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");String signMac=new String(Base64.encode(signByPriKey(privateKey,signSrc.getBytes(),"SHA1WithRSA")));System.out.println(signMac);//验签//      PublicKey publickey=loadPublicKey(publicKeyKeyStr);PublicKey publickey =getPublicKey("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","010001");boolean result=verifyByPubKey(publickey,signSrc.getBytes(),Base64.decode(signMac),"SHA1WithRSA");System.out.println(result);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
解释：
前一个main方法测试公私钥密文传输，后一个main方法测试公私钥明文传输。
公私钥生成方式，可以利用linux 使用openssl生成pkcs1格式秘钥:
私钥openssl genrsa -out private.key 512
公钥openssl rsa -in private.key -pubout -out public.key
提取当前文件目录里面的字符串秘钥，这种方式产生的是密文公私钥，拷贝出来即可使用。
另外需注意的是加密算法和解密算法一定要保持一致。
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