通过OpenSSL生成公私钥文件（如果没有OpenSSL工具建议下载Cmder工具自带OpenSSL指令）
1、生成RSA密钥的方法
genrsa -out private-rsa.key 2048
2、获取客户端公钥文件
openssl req -new -x509 -key private-rsa.key -days 750 -out public-rsa.cer
3、获取服务器私钥文件
openssl pkcs12 -export -name zhangsan -in public-rsa.cer -inkey private-rsa.key -out user-rsa.pfx
4、获取密钥文件的5元组数据
openssl rsa -in private-rsa.key -noout -text
Java实现私钥签名、公钥验签、私钥加密数据、公钥解密数据
import javax.crypto.Cipher;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory; public class Sha1withRSAUtil {
private static final String publicKeyFileName = System.getProperty("user.dir") + File.separator + "pubkey.cer";
private static final String privateKeyFileName = System.getProperty("user.dir") + File.separator + "private.pfx";
private static final String pfxPassword = "123";//私钥文件获取时设置的密钥
private static String aliasName = "003";//alias名称 /**
* 签名
*
* @return 签名后经过base64处理的字符串
* @throws Exception
*/
public static String sign(String str) {
String base64Sign = "";
InputStream fis = null;
try {
fis = new FileInputStream(privateKeyFileName);
KeyStore keyStore = KeyStore.getInstance("PKCS12");
char[] pscs = pfxPassword.toCharArray();
keyStore.load(fis, pscs);
PrivateKey priKey = (PrivateKey) (keyStore.getKey(aliasName, pscs));
// 签名
Signature sign = Signature.getInstance("SHA1withRSA");
sign.initSign(priKey);
byte[] bysData = str.getBytes("UTF-8");
sign.update(bysData);
byte[] signByte = sign.sign();
BASE64Encoder encoder = new BASE64Encoder();
base64Sign = encoder.encode(signByte);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return base64Sign;
} /**
* 数据验证
*
* @param signStr 加密后的数据
* @param verStr 原始字符
* @return
*/
public static boolean verify(String signStr, String verStr)
throws Exception {
boolean verfy = false;
InputStream fis = null;
try {
fis = new FileInputStream(publicKeyFileName);
CertificateFactory cf = CertificateFactory.getInstance("x509");
Certificate cerCert = cf.generateCertificate(fis);
PublicKey pubKey = cerCert.getPublicKey();
BASE64Decoder decoder = new BASE64Decoder();
byte[] signed = decoder.decodeBuffer(signStr);
Signature sign = Signature.getInstance("SHA1withRSA");
sign.initVerify(pubKey);
sign.update(verStr.getBytes("UTF-8"));
verfy = sign.verify(signed);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return verfy;
} /**
* 通过公钥文件进行加密数据
*
* @return 加密后经过base64处理的字符串
*/
public static String encrypt(String source) throws Exception {
InputStream fis = null;
try {
fis = new FileInputStream(publicKeyFileName);
CertificateFactory cf = CertificateFactory.getInstance("x509");
Certificate cerCert = cf.generateCertificate(fis);
PublicKey pubKey = cerCert.getPublicKey();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] sbt = source.getBytes();
byte[] epByte = cipher.doFinal(sbt);
BASE64Encoder encoder = new BASE64Encoder();
String epStr = encoder.encode(epByte);
return epStr;
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} /**
* 通过私钥文件进行解密数据
*
* @return 解密后的明文字符串
*/
public static String decode(String source) throws Exception {
BASE64Decoder b64d = new BASE64Decoder();
byte[] keyByte = b64d.decodeBuffer(source);
InputStream fis = null;
try {
fis = new FileInputStream(privateKeyFileName);
KeyStore keyStore = KeyStore.getInstance("PKCS12");
char[] pscs = pfxPassword.toCharArray();
keyStore.load(fis, pscs);
PrivateKey priKey = (PrivateKey) (keyStore.getKey(aliasName, pscs));
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, priKey);
byte[] epByte = cipher.doFinal(keyByte);
return new String(epByte, "UTF-8");
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
使用方法
import com.util.rsa.Sha1withRSAUtil;
public class Main {
public static void main(String[] args) {
String data = "name123456789";
String signData = Sha1withRSAUtil.sign(data);
System.out.println(signData);
try {
boolean flag = Sha1withRSAUtil.verify(signData, data);
System.out.println(flag);
String eData = Sha1withRSAUtil.encrypt(data);
System.out.println(eData);
String dData = Sha1withRSAUtil.decode(eData);
System.out.println(dData);
} catch (Exception e) {
e.printStackTrace();
}
}
}