java 中RSA的方式实现非对称加密的实例
java中RSA的方式实现非对称加密的实例
RSA通俗理解：
你只要去想：既然是加密，那肯定是不希望别人知道我的消息，所以只有我才能解密，所以可得出公钥负责加密，私钥负责解密；同理，既然是签名，那肯定是不希望有人冒充我发消息，只有我才能发布这个签名，所以可得出私钥负责签名，公钥负责验证。
实现代码：
packagecom.sahadev;
importjava.security.KeyFactory;
importjava.security.KeyPair;
importjava.security.KeyPairGenerator;
importjava.security.PrivateKey;
importjava.security.PublicKey;
importjava.security.interfaces.RSAPrivateKey;
importjava.security.interfaces.RSAPublicKey;
importjava.security.spec.PKCS8EncodedKeySpec;
importjava.security.spec.X509EncodedKeySpec;
importjavax.crypto.Cipher;
importorg.apache.commons.codec.binary.Base64;
publicclassRSA{
publicstaticvoidmain(String[]args){
JDKRSA();
}
publicstaticvoidJDKRSA(){
try{
//构建密钥对儿
KeyPairGeneratorkeyPairGenerator=KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(512);
KeyPairkeyPair=keyPairGenerator.generateKeyPair();
RSAPublicKeyrsaPublicKey=(RSAPublicKey)keyPair.getPublic();
RSAPrivateKeyrsaPrivateKey=(RSAPrivateKey)keyPair.getPrivate();
System.out.println("PublicKey:"+org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPublicKey.getEncoded()));
System.out.println("PrivateKey:"+org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPrivateKey.getEncoded()));
//2.私钥加密，公钥解密---加密
PKCS8EncodedKeySpecpkcs8EncodedKeySpec=newPKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
KeyFactorykeyFactory=KeyFactory.getInstance("RSA");
PrivateKeyprivateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Ciphercipher=Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE,privateKey);
byte[]result=cipher.doFinal(DH.src.getBytes());
System.out.println("私钥加密，公钥解密------加密:"+Base64.encodeBase64String(result));
//3.私钥加密，公钥解密---解密
X509EncodedKeySpecx509EncodedKeySpec=newX509EncodedKeySpec(rsaPublicKey.getEncoded());
keyFactory=KeyFactory.getInstance("RSA");
PublicKeypublicKey=keyFactory.generatePublic(x509EncodedKeySpec);
cipher=Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE,publicKey);
result=cipher.doFinal(result);
System.out.println("私钥加密，公钥解密------解密:"+newString(result));
//4.公钥加密，私钥解密---加密
x509EncodedKeySpec=newX509EncodedKeySpec(rsaPublicKey.getEncoded());
keyFactory=KeyFactory.getInstance("RSA");
publicKey=keyFactory.generatePublic(x509EncodedKeySpec);
cipher=Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE,publicKey);
result=cipher.doFinal(DH.src.getBytes());
System.out.println("公钥加密，私钥解密------加密:"+Base64.encodeBase64String(result));
//5.公钥加密，私钥解密---解密
pkcs8EncodedKeySpec=newPKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
keyFactory=KeyFactory.getInstance("RSA");
privateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);
cipher=Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE,privateKey);
result=cipher.doFinal(result);
System.out.println("公钥加密，私钥解密------解密:"+newString(result));
}catch(Exceptione){
e.printStackTrace();
}
}
}
附上输出结果：
PublicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJcFshoP5xm94r2aTbe++aMZMzJtXHxDpqmMQ9aL1cEthr2Xtac+Eckv32Kzb4R8C/6vObNBfd8sWx9FU5N2y6cCAwEAAQ== PrivateKey:MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAlwWyGg/nGb3ivZpNt775oxkzMm1cfEOmqYxD1ovVwS2GvZe1pz4RyS/fYrNvhHwL/q85s0F93yxbH0VTk3bLpwIDAQABAkBdAA7rabug6IRGykztyFcmjxAuD5aSl358jnoAFuCtMo4skfxh1vR4ENFUE0Lt0zJ3CKVH0o9UQDNG0r4jeOGRAiEA3KuXps9OG0AXuxLggg0e7B1Os5C3gNrH2fMqAPjtpY0CIQCvM4EPfdrjjNQiM0ATVBT5jZnw3PRu33pdyISWuoMHAwIgDOLMSUZjxj2Y5Si2CYIgoyMW/G9f99tOvlBvzHy8y+UCIF94MVu/uQdGNlJsmv3tU4CpKLmXrZq9LHDuU1HPUJcBAiEAy/0OS2Q9EBfmPwhsGXF4WMxj4wG0xzNFWxSeZB0qxzk= 私钥加密，公钥解密------加密:NXF87irBEmK3x/fW7IWY4GuA8AP4Rvj4DJSp2Cjjsoo5X/ScHHKdvYtlM+9TOUAvMeuKWk5WH70g53q7+E73zg== 私钥加密，公钥解密------解密:Hello,sahadev! 公钥加密，私钥解密------加密:hjL8928jCbNtVCRhKaYAxQNJmiIAktBskhff2I01pbaHtfGH6GJTcP1i345/3I9OzwoVFxvi/oXgVJsIsg7MOQ== 公钥加密，私钥解密------解密:Hello,sahadev!
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