基于Java的加密解密工具集 JCT v1.0源码包.zip

package jct; import java.security.KeyFactory; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Signature; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.SecureRandom; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.security.Security; import javax.crypto.Cipher; /** * <p>封装同RSA非对称加密算法有关的方法，可用于数字签名，RSA加密解密</p> * @Copyright:WDSsoft * @ad:WDSsoft “企业多级数字签名系统”- 最佳的企业电子文档多级数字签名方案 * @URL:www.wdssoft.com * @作者 吴东升 mdss@wdssoft.com bluesunday@sohu.com */ public class RSATool { public RSATool() { } /** * 用一个已打包成byte[]形式的私钥加密数据，即数字签名 * @param keyInByte 打包成byte[]的私钥 * @param source 要签名的数据，一般应是数字摘要 * @return 签名 byte[] */ public static byte[] sign(byte[] keyInByte,byte[] source){ try{ PKCS8EncodedKeySpec priv_spec=new PKCS8EncodedKeySpec(keyInByte); KeyFactory mykeyFactory=KeyFactory.getInstance("RSA"); PrivateKey privKey= mykeyFactory.generatePrivate(priv_spec); Signature sig=Signature.getInstance("SHA1withRSA"); sig.initSign(privKey); sig.update(source); return sig.sign(); }catch(Exception e){ return null; } } /** * 验证数字签名 * @param keyInByte 打包成byte[]形式的公钥 * @param source 原文的数字摘要 * @param sign 签名（对原文的数字摘要的签名） * @return 是否证实 boolean */ public static boolean verify(byte[] keyInByte,byte[] source,byte[] sign){ try{ KeyFactory mykeyFactory=KeyFactory.getInstance("RSA"); Signature sig=Signature.getInstance("SHA1withRSA"); X509EncodedKeySpec pub_spec=new X509EncodedKeySpec(keyInByte); PublicKey pubKey=mykeyFactory.generatePublic(pub_spec); sig.initVerify(pubKey); sig.update(source); return sig.verify(sign); }catch(Exception e){ return false; } } /** * 建立新的密钥对，返回打包的byte[]形式私钥和公钥 * @return 包含打包成byte[]形式的私钥和公钥的object[],其中，object[0]为私钥byte[],object[1]为工要byte[] */ public static Object[] giveRSAKeyPairInByte(){ KeyPair newKeyPair=creatmyKey(); if(newKeyPair==null)return null; Object[] re=new Object[2]; if(newKeyPair!=null){ PrivateKey priv=newKeyPair.getPrivate(); byte[] b_priv = priv.getEncoded(); PublicKey pub=newKeyPair.getPublic(); byte[] b_pub=pub.getEncoded(); re[0]=b_priv; re[1]=b_pub; return re; } return null; } /** * 新建密钥对 * @return KeyPair对象 */ public static KeyPair creatmyKey(){ KeyPair myPair; long mySeed; mySeed=System.currentTimeMillis(); try{ KeyPairGenerator keyGen=KeyPairGenerator.getInstance("RSA"); SecureRandom random=SecureRandom.getInstance("SHA1PRNG","SUN"); random.setSeed(mySeed); keyGen.initialize(1024,random); myPair=keyGen.generateKeyPair(); }catch(Exception e1){ return null; } return myPair; } /** * 使用RSA公钥加密数据 * @param pubKeyInByte 打包的byte[]形式公钥 * @param data 要加密的数据 * @return 加密数据 */ public static byte[] encryptByRSA(byte[] pubKeyInByte,byte[] data){ try{ KeyFactory mykeyFactory=KeyFactory.getInstance("RSA"); X509EncodedKeySpec pub_spec=new X509EncodedKeySpec(pubKeyInByte); PublicKey pubKey=mykeyFactory.generatePublic(pub_spec); Cipher cipher=Cipher.getInstance("RSA/ECB/PKCS1Padding"); cipher.init(Cipher.ENCRYPT_MODE,pubKey); return cipher.doFinal(data); }catch(Exception e){ return null; } } /** * 用RSA私钥解密 * @param privKeyInByte 私钥打包成byte[]形式 * @param data 要解密的数据 * @return 解密数据 */ public static byte[] decryptByRSA(byte[] privKeyInByte,byte[] data){ try{ PKCS8EncodedKeySpec priv_spec=new PKCS8EncodedKeySpec(privKeyInByte); KeyFactory mykeyFactory=KeyFactory.getInstance("RSA"); PrivateKey privKey= mykeyFactory.generatePrivate(priv_spec); Cipher cipher=Cipher.getInstance("RSA/ECB/PKCS1Padding"); cipher.init(Cipher.DECRYPT_MODE,privKey); return cipher.doFinal(data); }catch(Exception e){ return null; } } /** *测试 */ public static void main(String[] args) { try{ Object[] v=giveRSAKeyPairInByte(); byte[] source=Digest.MdigestSHA("haha"); byte[] sign=sign((byte[])v[0],source); boolean yes=verify((byte[])v[1],source,sign); if(yes) System.out.print("verify\n"); }catch(Exception e){e.printStackTrace();} } }