RSA加解密，Java和C#互通
使⽤场景
RSA算法这⾥就不多做介绍了，可参考
规范
测试内容
C#⽤公钥加密，Java⽤私钥解密
Java⽤私钥加密，C#⽤公钥解密
测试代码
先给出测试代码，后⾯会有具体的源码。
⾸先Java作为服务端⽣成⼀对公私钥
// ⽣成⼀对公私钥
KeyStore keyPair = ateKeys();
System.out.println("公钥：" + PublicKey());
System.out.println("私钥：" + PrivateKey());
公钥
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u 3UBmserNYPQWQt1Jb/HiAG5alrnwWB1XypRyyilVsARXblv1AtwG4Y5BWvDG0jsipmRj581TQSd1w2Nq6rw/xzUH2xzUx8M LmoJu1RiC1oCEUx1CgQIDAQAB
私钥：
MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAKcSoEv3RM3adpmJxDKKTfff8GMb9/khvs/SfmPc7kjGonC
8hJuKbleD3i7dQGax6s1g9BZC3Ulv8eIAblqWufBYHVfKlHLKKVWwBFduW/UC3AbhjkFa8MbSOyKmZGPnzVNBJ3XDY2rqv D/HNQfbHNTHwwuagm7VGILWgIRTHUKBAgMBAAECgYBqDOizT8Hc6U9fJpPjgOb88KkmQBqniUQVpweTXCnlCDEUXpXO JZDk/E+Mb+TxSv5AX8qQVuEgPG7NhniGCCb93qnKi5bU/rw+CQgm9er1pf97aIsvGobnw63bTE1HosWOfuHZTVwGybsQU GM3uPu8xxNaqRSlAknalniO9Y0AAQJBAPS0GZYPMAb+Jb4Yk1gD/joEFp3K5Uedk6dr+rDsNAV1gWBT3dOYjC0oUj5Ju3M Qd8RxAm/CG6vDpRm4zRlbW6ECQQCuyRZ99uG+ViLqZlnCvOoTvb02VO/t+JnlW/ZexUIZZnuZPi1OxmnuAnA4prglkMI20 KWLvXsxUFss6JGGx3rhAkEA3SWWqgL3yJoOygmzv6t8KjpfpiMjquFB++CeIx6UtQpI7iFdLEmFBZqXGSvReF+9nY70QMQP 9d9OajyVPwFNgQJBAJ3nTymXi5PP75VByB/VWcdh5/mYvHWJ3UbHUQmHPdMCsfDcqkP7nqGGlGmpvL07TSoGTziygwQ nK2ej6C0SNCECQQCOIO3vrXv4OJzU0dUdkmE5F3Yp/jIzsLpKG1wYE1cv6voRvrMLq8s2LL/5igQLV0XfM//PfQC2hdQIAo ORnScc
C#客户端，通过公钥加密
加密内容：你好rsa
RSA rsa = new RSA();
string content = "你好rsa";
string pubKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u3UBmserNY
// 公钥加密
string mi = rsa.EncryptByPublicKey(content, pubKey);
得到加密后的字符串（base64格式）：
cLoDffoAxmu6AirAbwpentv7+LwrpD4UZ1OuGxRuhmao0mm6YhK8O3mkQAD235RJ/XlhK6dK8tp4XsBD4FFSCxcoyrnkda yWrGeWtRXRgYWPIpBrperinPXLt0rNYOvNVHWniewyAmPjrU1wfq7BqLZwYyXEGG9QFI83aZIT9xc=
Java服务端私钥解密
// 公钥加密后的内容
String mi = "cLoDffoAxmu6AirAbwpentv7+LwrpD4UZ1OuGxRuhmao0mm6YhK8O3mkQAD235RJ/XlhK6dK8tp4XsBD4FFSCxcoyrnkdayWrGeWtRXRgYWPI // 私钥
String priKey = "MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAKcSoEv3RM3adpmJxDKKTfff8GMb9/khvs/SfmPc7kjGonC8hJuKbleD3i7d // 解密后的内容
String content = RSAUtil.decryptByPrivateKey(mi, priKey);
System.out.println("你好rsa".equals(content)); // true
⾄此，公钥加密，私钥解密测试通过。接下来测试Java私钥加密，C#公钥解密
Java私钥加密
加密内容：你好rsa
// 私钥
String priKey = "MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAKcSoEv3RM3adpmJxDKKTfff8GMb9/khvs/SfmPc7kjGonC8hJuKbleD3i7d String content = "你好rsa";
String mi = ptByPrivateKey(content, priKey);
System.out.println(mi);
加密后的内容：
mm8zoUtHvX8nBnCeZQ6k0aPzbmsvgJiIlyG2QIu9bnsO9BikqUpPOU+4UD6pH60TqQuEJFC1Ynv4D2/K2XryfVLYlwNftuO3
Ngem5eVwTkYYAeVnDZ7PlHvemuSV7KPNo/erMhVef1rh5avB/PtSP8tKzmMTJ0hQTVILIaRwhq8=
C#公钥解密
RSA rsa = new RSA();
// Java私钥加密后的内容
string mi = @"mm8zoUtHvX8nBnCeZQ6k0aPzbmsvgJiIlyG2QIu9bnsO9BikqUpPOU+4UD6pH60TqQuEJFC1Ynv4D2/K2XryfVLYlwNftuO3Ngem5eVwTkYYA // 公钥
string pubKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u3UBmserNY // 解密后的内容
string content = rsa.DecryptByPublicKey(mi, pubKey);
Assert.IsTrue("你好rsa" == content); // true
源码
Java源码
需要apache的commons-codec.jar
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.11</version>
</dependency>
import dec.binary.Base64;
pto.Cipher;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* RSA加解密⼯具<br>
*/
public class RSAUtil {
public static String RSA_ALGORITHM = "RSA";
public static String UTF8 = "UTF-8";
/**
* 创建公钥私钥
*
* @return
* @throws Exception
*/
public static KeyStore createKeys() throws Exception {
KeyPairGenerator keyPairGeno = Instance(RSA_ALGORITHM); keyPairGeno.initialize(1024);
KeyPair keyPair = ateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) Public();
RSAPrivateKey privateKey = (RSAPrivateKey) Private();
KeyStore keyStore = new KeyStore();
keyStore.Encoded()));
keyStore.Encoded()));
return keyStore;
}
/**
* 获取公钥对象
*
* @param pubKeyData
* @return
* @throws Exception
*/
public static RSAPublicKey getPublicKey(byte[] pubKeyData) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubKeyData);
KeyFactory keyFactory = Instance(RSA_ALGORITHM);
return (RSAPublicKey) atePublic(keySpec);
}
/**
* 获取公钥对象
*
* @param pubKey
* 公钥
* @return
* @throws Exception
*/
public static RSAPublicKey getPublicKey(String pubKey) throws Exception {
return getPublicKey(Base64.decodeBase64(pubKey));
}
/**
* 获取私钥对象
*
* @param priKey
* 私钥
* @return
* @throws Exception
*/
public static RSAPrivateKey getPrivateKey(String priKey) throws Exception {
return getPrivateKey(Base64.decodeBase64(priKey));
}
/**
* 通过私钥byte[]将公钥还原，适⽤于RSA算法
*
* @param keyBytes
* @return
* @throws Exception
*/
public static RSAPrivateKey getPrivateKey(byte[] keyBytes) throws Exception {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = Instance(RSA_ALGORITHM);
return (RSAPrivateKey) atePrivate(keySpec);
}
public static String encryptByPublicKey(String data, String publicKey) throws Exception {
return encryptByPublicKey(data, getPublicKey(publicKey));
}
/
**
* 公钥加密
*
* @param data
* @param publicKey
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, RSAPublicKey publicKey) throws Exception {
Cipher cipher = Instance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] bytes = cipher.Bytes(UTF8));
deBase64String(bytes);
}
public static String decryptByPublicKey(String data, String rsaPublicKey) throws Exception {
return decryptByPublicKey(data, getPublicKey(rsaPublicKey));
}
/**
* 公钥解密
*
* @param data
* @param rsaPublicKey
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String data, RSAPublicKey rsaPublicKey) throws Exception { Cipher cipher = Instance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, rsaPublicKey);
byte[] inputData = Base64.decodeBase64(data);
byte[] bytes = cipher.doFinal(inputData);
return new String(bytes, UTF8);
}
public static String encryptByPrivateKey(String data, String privateKey) throws Exception {
return encryptByPrivateKey(data, getPrivateKey(privateKey));
}
/**
* 私钥加密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String data, RSAPrivateKey privateKey) throws Exception { Cipher cipher = Instance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] bytes = cipher.Bytes(UTF8));
deBase64String(bytes);
}
public static String decryptByPrivateKey(String data, String privateKey) throws Exception {
return decryptByPrivateKey(data, getPrivateKey(privateKey));
}
/**
* 私钥解密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String data, RSAPrivateKey privateKey) throws Exception { Cipher cipher = Instance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] inputData = Base64.decodeBase64(data);
byte[] bytes = cipher.doFinal(inputData);
return new String(bytes, UTF8);
}
public static class KeyStore {
private String publicKey;
private String privateKey;
public String getPublicKey() {
return publicKey;
}
public void setPublicKey(String publicKey) {
this.publicKey = publicKey;
}
public String getPrivateKey() {
return privateKey;
}
public void setPrivateKey(String privateKey) {
this.privateKey = privateKey;
}
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