java中的加解密操作

      java中，加解密方式有五种，Base64、消息摘要、对称加密、非对称加密、数字签名。

   消息摘要加密有两种算法：MD和SHA

   对称加密有四种算法：DES、3DES、AES、PBE

   非对称加密有两种算法：DH、RSA

   数字签名有三种算法:RSA、DSA、ECDSA

    

   

public class EncodeUtil {    /**     * Base64     * @param code     * @return     */    public static String base64Encode(String code){        byte[] encode=null;        //bc        encode =org.bouncycastle.util.encoders.Base64.encode(code.getBytes());        //cc       encode=Base64.encodeBase64(code.getBytes());        return new String(encode);    }    /***     * MD5     * @param code     * @return     */    public static String md5Encode(String code){        byte[] md5Encode = null;        //jdk        try {            MessageDigest md = MessageDigest.getInstance("MD5");            md5Encode=md.digest(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }        //bc        MD5Digest digest = new MD5Digest();        digest.update(code.getBytes(),0,code.getBytes().length);        md5Encode=new byte[digest.getDigestSize()];        digest.doFinal(md5Encode,0);        //cc        md5Encode =DigestUtils.md5(code.getBytes());        return Hex.encodeHexString(md5Encode);    }    /**     * SHA     * @param code     * @return     */    public static String shaEncode(String code){        byte[] shaEncode=null;        //jdk        try {            MessageDigest messageDigest=MessageDigest.getInstance("SHA");           shaEncode=messageDigest.digest(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }        //bc        Digest digest = new SHA1Digest();        digest.update(code.getBytes(),0,code.getBytes().length);        shaEncode = new byte[digest.getDigestSize()];        digest.doFinal(shaEncode,0);        //cc        shaEncode =DigestUtils.sha1(code);        return Hex.encodeHexString(shaEncode);    }    /***     * 对称加密     * 第一步：生成Key     * 第二步：转换Key     * 第三步：加解密的操作     */   public static String desEncode(String code){       byte[] desEncode=null;       try {           //jdk           //生成Key           KeyGenerator keygenerator=KeyGenerator.getInstance("DES");           keygenerator.init(56);           SecretKey secretKey=keygenerator.generateKey();           byte[] byteKey=secretKey.getEncoded();           //Key的转换           DESKeySpec desKetSpec= new DESKeySpec(byteKey);           SecretKeyFactory secretKeyFactory=SecretKeyFactory.getInstance("DES");           Key convertKey=secretKeyFactory.generateSecret(desKetSpec);           //加密           Cipher cipher=Cipher.getInstance("DES/ECB/PKCSPadding");           cipher.init(Cipher.ENCRYPT_MODE,convertKey);           desEncode=cipher.doFinal(code.getBytes());       } catch (NoSuchAlgorithmException e) {           e.printStackTrace();       } catch (InvalidKeyException e) {           e.printStackTrace();       } catch (InvalidKeySpecException e) {           e.printStackTrace();       } catch (NoSuchPaddingException e) {           e.printStackTrace();       } catch (BadPaddingException e) {           e.printStackTrace();       } catch (IllegalBlockSizeException e) {           e.printStackTrace();       }       return Hex.encodeHexString(desEncode);   }    public static String threedesEncode(String code){        byte[] desEncode=null;        try {            //jdk            //生成Key            KeyGenerator keygenerator=KeyGenerator.getInstance("DESede");            keygenerator.init(168);            SecretKey secretKey=keygenerator.generateKey();            byte[] byteKey=secretKey.getEncoded();            //Key的转换            DESedeKeySpec desKetSpec= new DESedeKeySpec(byteKey);            SecretKeyFactory secretKeyFactory=SecretKeyFactory.getInstance("DESede");            Key convertKey=secretKeyFactory.generateSecret(desKetSpec);            //加密            Cipher cipher=Cipher.getInstance("DESede/ECB/PKCSPadding");            cipher.init(Cipher.ENCRYPT_MODE,convertKey);            desEncode=cipher.doFinal(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return Hex.encodeHexString(desEncode);    }    public static String aesEncode(String code){        byte[] aesEncode=null;        //jdk        try {            //生成Key            KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");            keyGenerator.init(new SecureRandom());            SecretKey secretKey=keyGenerator.generateKey();            byte[] keyByte=secretKey.getEncoded();            //key的转换            Key key = new SecretKeySpec(keyByte,"AES");            //加密            Cipher cipher=Cipher.getInstance("AES/ECB/PKS5Padding");            cipher.init(Cipher.ENCRYPT_MODE,key);            aesEncode=cipher.doFinal(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return Hex.encodeHexString(aesEncode);    }    public static String pbeEncoder(String code){        byte[] pbeEncode=null;        try {            //jdk            //初始化盐            SecureRandom secureRam = new SecureRandom();            byte[] salt = secureRam.generateSeed(8);            //口令与密钥            String password="123456";            PBEKeySpec pbeKeySpec= new PBEKeySpec(password.toCharArray());            SecretKeyFactory factory =SecretKeyFactory.getInstance("PBEWITHMD5andDES");            //生成Key            Key key=factory.generateSecret(pbeKeySpec);            //加密            PBEParameterSpec pbeParameterSpec= new PBEParameterSpec(salt,100);            Cipher cipher = Cipher.getInstance("PBEWITHMD5andAES");            cipher.init(Cipher.ENCRYPT_MODE,key,pbeParameterSpec);            pbeEncode =cipher.doFinal(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        } catch (InvalidAlgorithmParameterException e) {            e.printStackTrace();        }        return Hex.encodeHexString(pbeEncode);    }    /***     * 非对称加密。     * 第一步：发送方生成sendPublicKeyEnc     * 第二步：接收方根据发送方的sendPublicKeyEnc构建自己的本地密钥以及receiverPublicKeyEnc     * 第三步：发送方根据接收方的receiverPublicKeyEnc构建自己的本地密钥     */    public static String dhEncoder(String code){        byte[] dhEncoder=null;        try {            //初始化发送方sendPublicKeyEnc。            KeyPairGenerator sendKeyPairGenerator=KeyPairGenerator.getInstance("DH");            sendKeyPairGenerator.initialize(512);            KeyPair sendKeyPair = sendKeyPairGenerator.genKeyPair();            byte[] sendPublicKeyEnc= sendKeyPair.getPublic().getEncoded();            //解析发送方的PublicKeyEnc            KeyFactory receiveKeyFactory= KeyFactory.getInstance("DH");            X509EncodedKeySpec x509EncoderKeySpec=new X509EncodedKeySpec(sendPublicKeyEnc);            PublicKey receiverPublicKey = receiveKeyFactory.generatePublic(x509EncoderKeySpec);            DHParameterSpec dhParameterSpec=((DHPublicKey)receiverPublicKey).getParams();            KeyPairGenerator receiverKeyPairGenerator = KeyPairGenerator.getInstance("DH");            receiverKeyPairGenerator.initialize(dhParameterSpec);            KeyPair receiverKeyPair = receiverKeyPairGenerator.generateKeyPair();            //密钥构建以及生成receiverPublicKeyEnc            KeyAgreement receiverKeyAgreement=KeyAgreement.getInstance("DH");            PrivateKey receiverPrivateKey=receiverKeyPair.getPrivate();            receiverKeyAgreement.init(receiverPrivateKey);            receiverKeyAgreement.doPhase(receiverPublicKey, true);            SecretKey receiverDesKey = receiverKeyAgreement.generateSecret("DES");            byte[] receiverPublicKeyEnc = receiverKeyPair.getPublic().getEncoded();            //发送方收到接收方的receiverPublicKeyEnc，生成自己的本地密钥            KeyFactory sendKeyFactory = KeyFactory.getInstance("DH");            x509EncoderKeySpec=new X509EncodedKeySpec(receiverPublicKeyEnc);            PublicKey sendPublicKey = sendKeyFactory.generatePublic(x509EncoderKeySpec);            KeyAgreement sendKeyAgreement = KeyAgreement.getInstance("DH");            sendKeyAgreement.init(sendKeyPair.getPrivate());            sendKeyAgreement.doPhase(sendPublicKey, true);            //发送方本地密钥            SecretKey sendDesKey=sendKeyAgreement.generateSecret("DES");            //加密            Cipher cipher = Cipher.getInstance("DES");            cipher.init(Cipher.ENCRYPT_MODE,sendDesKey);            dhEncoder=cipher.doFinal(code.getBytes());        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (InvalidAlgorithmParameterException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return Hex.encodeHexString(dhEncoder);    }    public static String rsaEncoder(String code){        byte[] rsaEncoder=null;        //jdk        try {            //初始化密钥            KeyPairGenerator keyPairGrnerator=KeyPairGenerator.getInstance("RSA");            keyPairGrnerator.initialize(512);            KeyPair keyPair = keyPairGrnerator.generateKeyPair();            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();            RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();            //私钥加密，公钥解密----加密            PKCS8EncodedKeySpec pkcs8EncodedKeySpec=new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());            KeyFactory keyFactory=KeyFactory.getInstance("RSA");            PrivateKey privateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);            Cipher cipher = Cipher.getInstance("RSA");            cipher.init(Cipher.ENCRYPT_MODE,privateKey);            rsaEncoder = cipher.doFinal(code.getBytes());            //私钥加密，公钥解密----解密            X509EncodedKeySpec x509EncodedKeySpec= new X509EncodedKeySpec(rsaPublicKey.getEncoded());            keyFactory = KeyFactory.getInstance("RSA");            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);            cipher=Cipher.getInstance("RSA");            cipher.init(Cipher.DECRYPT_MODE, publicKey);            rsaEncoder =cipher.doFinal(rsaEncoder);            //公钥加密，私钥解密----加密            x509EncodedKeySpec= new X509EncodedKeySpec(rsaPublicKey.getEncoded());            keyFactory = KeyFactory.getInstance("RSA");            publicKey = keyFactory.generatePublic(x509EncodedKeySpec);            cipher=Cipher.getInstance("RSA");            cipher.init(Cipher.ENCRYPT_MODE,publicKey);            rsaEncoder=cipher.doFinal(code.getBytes());            //公钥加密，私钥解密----解密            pkcs8EncodedKeySpec=new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());            keyFactory=KeyFactory.getInstance("RSA");            privateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);            cipher = Cipher.getInstance("RSA");            cipher.init(Cipher.DECRYPT_MODE,privateKey);            rsaEncoder = cipher.doFinal(rsaEncoder);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return Hex.encodeHexString(rsaEncoder);    }    /***     * 数字签名算法 RSA DSA ECDSA     */    public static String signRsaEncoder(String code){        byte[] signRsaEncode=null;        try {            //jdk            //初始化密钥            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");            keyPairGenerator.initialize(512);            KeyPair keyPair = keyPairGenerator.generateKeyPair();            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();            RSAPrivateKey rsaPrivateKey= (java.security.interfaces.RSAPrivateKey) keyPair.getPrivate();            //执行私钥签名            PKCS8EncodedKeySpec pkcS8EncodedKeySpec=new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());            KeyFactory keyFactory=KeyFactory.getInstance("RSA");            PrivateKey privateKey=keyFactory.generatePrivate(pkcS8EncodedKeySpec);            Signature signature= Signature.getInstance("MD5withRSA");            signature.initSign(privateKey);            signature.update(code.getBytes());            signRsaEncode=signature.sign();            //公钥验证签名            X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(rsaPublicKey.getEncoded());            keyFactory = KeyFactory.getInstance("RSA");            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);            signature = Signature.getInstance("MD5withRSA");            signature.initVerify(publicKey);            signature.update(code.getBytes());            boolean isTrue =signature.verify(signRsaEncode);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (SignatureException e) {            e.printStackTrace();        }        return Hex.encodeHexString(signRsaEncode);    }    public static String signDsaEncode(String code){        byte[] signDsaEncode=null;        try {            //初始化密钥            KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("DSA");            keyPairGenerator.initialize(512);            KeyPair keyPair=keyPairGenerator.generateKeyPair();            DSAPublicKey dsaPublicKey= (DSAPublicKey) keyPair.getPublic();            DSAPrivateKey dsaPrivateKey= (DSAPrivateKey) keyPair.getPrivate();            //执行签名            PKCS8EncodedKeySpec pkcS8EncodedKeySpec=new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());            KeyFactory keyFactory=KeyFactory.getInstance("DSA");            PrivateKey privateKey=keyFactory.generatePrivate(pkcS8EncodedKeySpec);            Signature signnatrue=Signature.getInstance("SHA1withDSA");            signnatrue.initSign(privateKey);            signnatrue.update(code.getBytes());            signDsaEncode=signnatrue.sign();            //验证签名            X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(dsaPublicKey.getEncoded());            keyFactory = KeyFactory.getInstance("DSA");            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);            signnatrue = Signature.getInstance("SHA1withDSA");            signnatrue.initVerify(publicKey);            signnatrue.update(code.getBytes());            boolean isTrue =signnatrue.verify(signDsaEncode);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (SignatureException e) {            e.printStackTrace();        }        return Hex.encodeHexString(signDsaEncode);    }    public static String signEcDsaEncode(String code){        byte[] signEcDsaEncode=null;        try {            //初始化密钥            KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("DSA");            keyPairGenerator.initialize(512);            KeyPair keyPair=keyPairGenerator.generateKeyPair();            ECPublicKey ecPublicKey= (ECPublicKey) keyPair.getPublic();            ECPrivateKey ecPrivateKey= (ECPrivateKey) keyPair.getPrivate();            //执行签名            PKCS8EncodedKeySpec pkcS8EncodedKeySpec=new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());            KeyFactory keyFactory=KeyFactory.getInstance("EC");            PrivateKey privateKey=keyFactory.generatePrivate(pkcS8EncodedKeySpec);            Signature signnatrue=Signature.getInstance("SHA1withECDSA");            signnatrue.initSign(privateKey);            signnatrue.update(code.getBytes());            signEcDsaEncode=signnatrue.sign();            //验证签名            X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(ecPublicKey.getEncoded());            keyFactory = KeyFactory.getInstance("EC");            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);            signnatrue = Signature.getInstance("SHA1withECDSA");            signnatrue.initVerify(publicKey);            signnatrue.update(code.getBytes());            boolean isTrue =signnatrue.verify(signEcDsaEncode);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (InvalidKeySpecException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (SignatureException e) {            e.printStackTrace();        }        return Hex.encodeHexString(signEcDsaEncode);    }}