Java加密算法RSA代码实例
这篇文章主要介绍了Java加密算法RSA代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
代码如下
importjavax.crypto.BadPaddingException;
importjavax.crypto.Cipher;
importjavax.crypto.IllegalBlockSizeException;
importjavax.crypto.NoSuchPaddingException;
importjava.security.*;
importjava.security.interfaces.RSAPrivateKey;
importjava.security.interfaces.RSAPublicKey;
importjava.security.spec.InvalidKeySpecException;
importjava.security.spec.PKCS8EncodedKeySpec;
importjava.security.spec.X509EncodedKeySpec;
importjava.util.HashMap;
importjava.util.Map;
publicclassRSADecrypt{
publicstaticMapcreateKeyPair()throwsNoSuchAlgorithmException{
//创建秘钥对生成器
KeyPairGeneratorgenerator=KeyPairGenerator.getInstance("rsa");
//初始化密钥对生成器
generator.initialize(1024);
//生成密钥对
KeyPairkeyPair=generator.generateKeyPair();
//获取公钥私钥
RSAPrivateKeyprivateKey=(RSAPrivateKey)keyPair.getPrivate();
RSAPublicKeypublicKey=(RSAPublicKey)keyPair.getPublic();
StringpublicKeyStr=newString(publicKey.getEncoded());
StringprivateKeyStr=newString(privateKey.getEncoded());
//公钥私钥存放map
MapkeyMap=newHashMap<>();
keyMap.put("publicKey",publicKeyStr);
keyMap.put("privateKey",privateKeyStr);
returnkeyMap;
}
/**
*获取公钥
*@parampublicKey
*@return
*/
publicstaticRSAPublicKeygetPublicKey(StringpublicKey)throwsNoSuchAlgorithmException,InvalidKeySpecException{
KeyFactorykeyFactory=KeyFactory.getInstance("rsa");
//X509编码
X509EncodedKeySpecx509EncodedKeySpec=newX509EncodedKeySpec(publicKey.getBytes());
RSAPublicKeyrsaPublicKey=(RSAPublicKey)keyFactory.generatePublic(x509EncodedKeySpec);
returnrsaPublicKey;
}
/**
*获取私钥
*@paramprivateKey
*@return
*/
publicstaticRSAPrivateKeygetPrivateKey(StringprivateKey)throwsNoSuchAlgorithmException,InvalidKeySpecException{
KeyFactorykeyFactory=KeyFactory.getInstance("rsa");
//PKCS#8编码
PKCS8EncodedKeySpecpkcs8EncodedKeySpec=newPKCS8EncodedKeySpec(privateKey.getBytes());
RSAPrivateKeyrsaPrivateKey=(RSAPrivateKey)keyFactory.generatePrivate(pkcs8EncodedKeySpec);
returnrsaPrivateKey;
}
/**
*公钥加密
*@paramsrc
*@parampublicKey
*@return
*/
publicstaticbyte[]publicEncrypt(Stringsrc,RSAPublicKeypublicKey)throwsNoSuchPaddingException,NoSuchAlgorithmException,InvalidKeyException,BadPaddingException,IllegalBlockSizeException{
Ciphercipher=Cipher.getInstance("rsa");
cipher.init(Cipher.ENCRYPT_MODE,publicKey);
byte[]encryptedData=cipher.doFinal(src.getBytes());
returnencryptedData;
}
/**
*私钥解密
*@paramdata
*@paramprivateKey
*@return
*@throwsNoSuchPaddingException
*@throwsNoSuchAlgorithmException
*@throwsInvalidKeyException
*@throwsBadPaddingException
*@throwsIllegalBlockSizeException
*/
publicstaticStringprivateDecrypt(byte[]data,RSAPrivateKeyprivateKey)throwsNoSuchPaddingException,NoSuchAlgorithmException,InvalidKeyException,BadPaddingException,IllegalBlockSizeException{
Ciphercipher=Cipher.getInstance("rsa");
cipher.init(Cipher.DECRYPT_MODE,privateKey);
byte[]result=cipher.doFinal(data);
returnnewString(result);
}
publicstaticvoidmain(String[]args)throwsNoSuchAlgorithmException,InvalidKeySpecException,IllegalBlockSizeException,InvalidKeyException,BadPaddingException,NoSuchPaddingException{
MapkeyPair=createKeyPair();
RSAPublicKeypublicKey=getPublicKey(keyPair.get("publicKey"));
RSAPrivateKeyprivateKey=getPrivateKey(keyPair.get("privateKey"));
Stringstr="helloworld";
/**
*公钥加密，私钥解密
*/
byte[]encryptedData=publicEncrypt(str,publicKey);
Stringresult=privateDecrypt(encryptedData,privateKey);
/**
*私钥加密，公钥解密
*/
byte[]encrypted=privateEncrypt(str,privateKey);
Stringsource=publicDecrypt(encrypted,publicKey);
}
/**
*私钥加密
*@paramsrc
*@paramprivateKey
*@return
*@throwsNoSuchPaddingException
*@throwsNoSuchAlgorithmException
*@throwsInvalidKeyException
*@throwsBadPaddingException
*@throwsIllegalBlockSizeException
*/
publicstaticbyte[]privateEncrypt(Stringsrc,RSAPrivateKeyprivateKey)throwsNoSuchPaddingException,NoSuchAlgorithmException,InvalidKeyException,BadPaddingException,IllegalBlockSizeException{
Ciphercipher=Cipher.getInstance("rsa");
cipher.init(Cipher.DECRYPT_MODE,privateKey);
byte[]result=cipher.doFinal(src.getBytes());
returnresult;
}
/**
*公钥解密
*@paramdata
*@parampublicKey
*@return
*@throwsNoSuchPaddingException
*@throwsNoSuchAlgorithmException
*@throwsInvalidKeyException
*@throwsBadPaddingException
*@throwsIllegalBlockSizeException
*/
publicstaticStringpublicDecrypt(byte[]data,RSAPublicKeypublicKey)throwsNoSuchPaddingException,NoSuchAlgorithmException,InvalidKeyException,BadPaddingException,IllegalBlockSizeException{
Ciphercipher=Cipher.getInstance("rsa");
cipher.init(Cipher.DECRYPT_MODE,publicKey);
byte[]result=cipher.doFinal(data);
returnnewString(result);
}
}
上面例子使用密钥长度1024，如果想使用2048密钥，只需要在初始化密钥对生成器做一些变动，其他部分可以复用。
generator.initialize(2048);
这个例子只是基本常用的RSA加解密，也可加入base64，签名。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。
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