Java(111)：非对称加密RSA的使用(openssl生成RSA公私钥对)

1、openssl生成RSA公私钥对

[root@loaclhost ~]# openssl version
OpenSSL 1.0.2k-fips  26 Jan 2017#生成RSA私钥：
[root@loaclhost ~]# openssl
OpenSSL> genrsa -out rsa_private_key.pem 1024
Generating RSA private key, 1024 bit long modulus
...........................................................++++++
.......++++++
e is 65537 (0x10001)
OpenSSL> pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform pem -nocrypt -out rsa_private_key_8.pem
#生成RSA公钥
OpenSSL> rsa -in rsa_private_key_8.pem -pubout -out rsa_public_key.pem

公钥：

-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeOvgowlgzAiPdIdBsFK5Yk9dH
B3BXQa1IieIkRbxC7ZGYiXJELbzHi5vcmmFuadKQBA1BltR3yNdIptRM9/NRQtVo
e+kuFIU1X/MgFhIGlP4O56LL5L8RqOg8yj/EOJzYBU7ioMZX6f2uDjCJ0s7Nx45y
/cr9RQJZbv5WAx4YyQIDAQAB
-----END PUBLIC KEY-----

私钥:

-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY----

openssl生成的公钥和私钥是Base64的，用时需要用base64解码

2、RSA加密和解密方法

   /*** 公钥加密* @param publicKey 公钥* @param obj 明文* @return byte[] 密文*/public static byte[] encrypt(RSAPublicKey publicKey, byte[] obj) throws Exception {Cipher cipher =Cipher.getInstance("RSA");cipher.init(Cipher.ENCRYPT_MODE,publicKey);//返回加密后的内容return cipher.doFinal(obj);}/*** 私钥解密* @param privateKey 公钥* @param obj 密文* @return byte[] 密文*/public static byte[] decrypt(RSAPrivateKey privateKey, byte[] obj)throws Exception {Cipher cipher = Cipher.getInstance("RSA");cipher.init(Cipher.DECRYPT_MODE, privateKey);//返回解密后的数组return cipher.doFinal(obj);}

3、Base64编码和解码

maven

<dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId><version>1.11</version>
</dependency>

代码：

    /*** 编码* @param txt byte字节数组* @return encode Base64编码*/public static byte[] encode(byte[] txt) {return org.apache.commons.codec.binary.Base64.encodeBase64(txt);}/*** 解码* @param txt 编码后的byte* @return decode Base64解码*/public static byte[] decode(String txt){return org.apache.commons.codec.binary.Base64.decodeBase64(txt);}

4、调用加解密

操作步骤

备注： openssl生成的公钥和私钥是Base64的，用时需要进行解码

1、先对公钥进行进行Base64解码。

2、再用解码后的公钥进行RSA加密(对密文进行Base64编码)

3、然后对私钥Base64解码

4、最后用解码的私钥进行RSA解密(输入：密文解码后入参，输出：转成字符串输出)。

 final static String PUBKEY="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeOvgowlgzAiPdIdBsFK5Yk9dH\n" +"B3BXQa1IieIkRbxC7ZGYiXJELbzHi5vcmmFuadKQBA1BltR3yNdIptRM9/NRQtVo\n" +"e+kuFIU1X/MgFhIGlP4O56LL5L8RqOg8yj/EOJzYBU7ioMZX6f2uDjCJ0s7Nx45y\n" +"/cr9RQJZbv5WAx4YyQIDAQAB";final static String PRIKEY="MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAN46+CjCWDMCI90h\n" +"0GwUrliT10cHcFdBrUiJ4iRFvELtkZiJckQtvMeLm9yaYW5p0pAEDUGW1HfI10im\n" +"1Ez381FC1Wh76S4UhTVf8yAWEgaU/g7nosvkvxGo6DzKP8Q4nNgFTuKgxlfp/a4O\n" +"MInSzs3HjnL9yv1FAllu/lYDHhjJAgMBAAECgYAZqZWen1KwET8y+gSndnvrnqbt\n" +"fN5sNRldlw6WQbdLw0Nc6gJX/TAfmu+Uuf8mUPIPz2f4ewJuErNJoHpDqR5fvLeP\n" +"YQNdJNKFK3wSqc58pMBkABMJEod94RbTEgDtC8FRZUbz98IUVMTwByLrRqgoZqAW\n" +"3XYU9zaYdj5QzNvvQQJBAP14trvc3DwkNq3YwJ+iJfsYbTJ21nNyYaJkUx2sb43p\n" +"KPOdpx+dmmlkk+uRYdJK9eLp+0m4LsARYfGR1Vrm2UcCQQDgcnm2wSbPuwqrkPbO\n" +"njRhtbUtFgAUMIevOAAbZEa1CmBeQ5eOfDirlSa3W/ZtL3GkfZWNv+rBKuOSTWoW\n" +"vIVvAkEAyz4uGDkihz7qcT+qRNY56jtN4/cSQgPncdVMKDEKSho5cg5p4Zn4JKY3\n" +"Td6HN55Px6GikxwSsIO/q3oqP/d3JQJAP+mZKydZS/HxGeXPwgpe1CwQCWSoZRdk\n" +"q8qAjUxCri7kPjN1JsfMw19XhQMU6waFj9eLDLBHwvXZk8GjohHQ1QJAKNzrOU8u\n" +"KuiV5qpnU+TXofdnngX+ovveaCUJDh3Mg1tFeBJ7R+rB1nub8sGUgdnPmDaE3tpp\n" +"N3vUqLzUXzbo1Q==";public static void main(String[] args)throws Exception {byte[] decode = decode(PUBKEY);RSAPublicKey publicKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decode));//执行加密和解密过程String InData="Hello World!";//得到要加密内容的数组byte[] byteInData =InData.getBytes("UTF-8");//用公钥加密byte[] cipherByte= encrypt(publicKey,byteInData);String cipher=new String(encode(cipherByte));System.out.println("RSA加密，密文："+cipher);//用私钥解密byte[] decode_pri = decode(PRIKEY);RSAPrivateCrtKey priKey = (RSAPrivateCrtKey)KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decode_pri));byte[] plainByte =decrypt(priKey,decode(cipher));System.out.println("RSA私钥解密，明文："+new String(plainByte));}

5、代码示例

package jmj;import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;/*** Description :** @author : HMF* Date : Created in 22:04 2023/3/13* @version :*/
public class RSAUtil {final static String PUBKEY="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeOvgowlgzAiPdIdBsFK5Yk9dH\n" +"B3BXQa1IieIkRbxC7ZGYiXJELbzHi5vcmmFuadKQBA1BltR3yNdIptRM9/NRQtVo\n" +"e+kuFIU1X/MgFhIGlP4O56LL5L8RqOg8yj/EOJzYBU7ioMZX6f2uDjCJ0s7Nx45y\n" +"/cr9RQJZbv5WAx4YyQIDAQAB";final static String PRIKEY="MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAN46+CjCWDMCI90h\n" +"0GwUrliT10cHcFdBrUiJ4iRFvELtkZiJckQtvMeLm9yaYW5p0pAEDUGW1HfI10im\n" +"1Ez381FC1Wh76S4UhTVf8yAWEgaU/g7nosvkvxGo6DzKP8Q4nNgFTuKgxlfp/a4O\n" +"MInSzs3HjnL9yv1FAllu/lYDHhjJAgMBAAECgYAZqZWen1KwET8y+gSndnvrnqbt\n" +"fN5sNRldlw6WQbdLw0Nc6gJX/TAfmu+Uuf8mUPIPz2f4ewJuErNJoHpDqR5fvLeP\n" +"YQNdJNKFK3wSqc58pMBkABMJEod94RbTEgDtC8FRZUbz98IUVMTwByLrRqgoZqAW\n" +"3XYU9zaYdj5QzNvvQQJBAP14trvc3DwkNq3YwJ+iJfsYbTJ21nNyYaJkUx2sb43p\n" +"KPOdpx+dmmlkk+uRYdJK9eLp+0m4LsARYfGR1Vrm2UcCQQDgcnm2wSbPuwqrkPbO\n" +"njRhtbUtFgAUMIevOAAbZEa1CmBeQ5eOfDirlSa3W/ZtL3GkfZWNv+rBKuOSTWoW\n" +"vIVvAkEAyz4uGDkihz7qcT+qRNY56jtN4/cSQgPncdVMKDEKSho5cg5p4Zn4JKY3\n" +"Td6HN55Px6GikxwSsIO/q3oqP/d3JQJAP+mZKydZS/HxGeXPwgpe1CwQCWSoZRdk\n" +"q8qAjUxCri7kPjN1JsfMw19XhQMU6waFj9eLDLBHwvXZk8GjohHQ1QJAKNzrOU8u\n" +"KuiV5qpnU+TXofdnngX+ovveaCUJDh3Mg1tFeBJ7R+rB1nub8sGUgdnPmDaE3tpp\n" +"N3vUqLzUXzbo1Q==";public static void main(String[] args)throws Exception {byte[] decode = decode(PUBKEY);RSAPublicKey publicKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decode));//执行加密和解密过程String InData="Hello World!";//得到要加密内容的数组byte[] byteInData =InData.getBytes("UTF-8");//用公钥加密byte[] cipherByte= encrypt(publicKey,byteInData);String cipher=new String(encode(cipherByte));System.out.println("RSA加密，密文："+cipher);//用私钥解密byte[] decode_pri = decode(PRIKEY);RSAPrivateCrtKey priKey = (RSAPrivateCrtKey)KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decode_pri));byte[] plainByte =decrypt(priKey,decode(cipher));System.out.println("RSA私钥解密，明文："+new String(plainByte));}/*** 编码* @param txt byte字节数组* @return encode Base64编码*/public static byte[] encode(byte[] txt) {return org.apache.commons.codec.binary.Base64.encodeBase64(txt);}/*** 解码* @param txt 编码后的byte* @return decode Base64解码*/public static byte[] decode(String txt){return org.apache.commons.codec.binary.Base64.decodeBase64(txt);}/*** 公钥加密* @param publicKey 公钥* @param obj 明文* @return byte[] 密文*/public static byte[] encrypt(RSAPublicKey publicKey, byte[] obj) throws Exception {Cipher cipher =Cipher.getInstance("RSA");cipher.init(Cipher.ENCRYPT_MODE,publicKey);//返回加密后的内容return cipher.doFinal(obj);}/*** 私钥解密* @param privateKey 公钥* @param obj 密文* @return byte[] 密文*/public static byte[] decrypt(RSAPrivateKey privateKey, byte[] obj)throws Exception {Cipher cipher = Cipher.getInstance("RSA");cipher.init(Cipher.DECRYPT_MODE, privateKey);//返回解密后的数组return cipher.doFinal(obj);}}

执行结果：

参考：

https://blog.csdn.net/caijiwyj/article/details/106840234

https://blog.csdn.net/qq78442761/article/details/119747726

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Java(111)：非对称加密RSA的使用(openssl生成RSA公私钥对)

Java(111)：非对称加密RSA的使用(openssl生成RSA公私钥对)

1、openssl生成RSA公私钥对

公钥：

私钥:

2、RSA加密和解密方法

3、Base64编码和解码

4、调用加解密

5、代码示例

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