java RSA 加密 java 中RSA的方式实现非对称加密的实例
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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:
package com.sahadev; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import javax.crypto.Cipher; import org.apache.commons.codec.binary.Base64; public class RSA { public static void main(String[] args) { JDKRSA(); } public static void JDKRSA() { try { // 构建密钥对儿 KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(512); KeyPair keyPair = keyPairGenerator.generateKeyPair(); RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate(); System.out.println("Public Key : " + org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPublicKey.getEncoded())); System.out.println("Private Key : " + org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPrivateKey.getEncoded())); // 2.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); 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 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); result = cipher.doFinal(result); System.out.println("私钥加密,公钥解密------解密 : " + new String(result)); // 4.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); 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 = new PKCS8EncodedKeySpec(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 : " + new String(result)); } catch (Exception e) { e.printStackTrace(); } } }
附上输出结果:
Public Key : MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJcFshoP5xm94r2aTbe++aMZMzJtXHxDpqmMQ9aL1cEthr2Xtac+Eckv32Kzb4R8C/6vObNBfd8sWx9FU5N2y6cCAwEAAQ== Private Key : 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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