恩,此处应该只有代码。

import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
 
import javax.crypto.Cipher;
 
public class RSACoder {
	public static final String KEY_ALGORITHM = "RSA";
	public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
	private static final String PUBLIC_KEY = "RSAPublicKey";
	private static final String PRIVATE_KEY = "RSAPrivateKey";
 
	public static String sign(byte[] data, String privateKey) throws Exception {
		// 解密由base64编码的私钥
		byte[] keyBytes = decryptBASE64(privateKey);
		// 构造PKCS8EncodedKeySpec对象
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取私钥匙对象
		PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 用私钥对信息生成数字签名
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initSign(priKey);
		signature.update(data);
		return encryptBASE64(signature.sign());
	}
 
	public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
		// 解密由base64编码的公钥
		byte[] keyBytes = decryptBASE64(publicKey);
		// 构造X509EncodedKeySpec对象
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		// KEY_ALGORITHM 指定的加密算法
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		// 取公钥匙对象
		PublicKey pubKey = keyFactory.generatePublic(keySpec);
		Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
		signature.initVerify(pubKey);
		signature.update(data);
		// 验证签名是否正常
		return signature.verify(decryptBASE64(sign));
	}
 
	public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私钥
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 对数据解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}
 
	public static byte[] decryptByPublicKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公钥
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 对数据解密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.DECRYPT_MODE, publicKey);
		return cipher.doFinal(data);
	}
 
	public static byte[] encryptByPublicKey(byte[] data, String key) throws Exception {
		// 对公钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得公钥
		X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key publicKey = keyFactory.generatePublic(x509KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		return cipher.doFinal(data);
	}
 
	public static byte[] encryptByPrivateKey(byte[] data, String key) throws Exception {
		// 对密钥解密
		byte[] keyBytes = decryptBASE64(key);
		// 取得私钥
		PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
		Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
		// 对数据加密
		Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, privateKey);
		return cipher.doFinal(data);
	}
 
	private static byte[] decryptBASE64(String key) throws Exception {
		// TODO Auto-generated method stub
		return Base64Utill.decodeBase64(key);
	}
 
	public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PRIVATE_KEY);
		return encryptBASE64(key.getEncoded());
	}
 
	private static String encryptBASE64(byte[] encoded) throws Exception {
		// TODO Auto-generated method stub
		return Base64Utill.encodeBase64(encoded);
	}
 
	public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
		Key key = (Key) keyMap.get(PUBLIC_KEY);
		return encryptBASE64(key.getEncoded());
	}
 
	public static Map<String, Object> initKey() throws Exception {
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
		keyPairGen.initialize(1024);
		KeyPair keyPair = keyPairGen.generateKeyPair();
		// 公钥
		RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
		// 私钥
		RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
		Map<String, Object> keyMap = new HashMap<String, Object>(2);
		keyMap.put(PUBLIC_KEY, publicKey);
		keyMap.put(PRIVATE_KEY, privateKey);
		return keyMap;
	}
 
	public static void testEncode(String publicKey, String privateKey) throws Exception {
		System.err.println("公钥加密——私钥解密");
		String inputStr = "abc";
		byte[] data = inputStr.getBytes();
		byte[] encodedData = RSACoder.encryptByPublicKey(data, publicKey);
		byte[] decodedData = RSACoder.decryptByPrivateKey(encodedData, privateKey);
		String outputStr = new String(decodedData);
		System.err.println("加密前: " + inputStr);
		System.err.println("加密后:" + new String(encodedData));
		System.err.println("解密后:" + outputStr);
		System.err.println(inputStr.equals(outputStr));
 
 
	}
 
	public static void testSign(String publicKey, String privateKey) throws Exception {
		System.err.println("私钥加密——公钥解密");
		String inputStr = "sign";
		byte[] data = inputStr.getBytes();
		byte[] encodedData = RSACoder.encryptByPrivateKey(data, privateKey);
		byte[] decodedData = RSACoder.decryptByPublicKey(encodedData, publicKey);
		String outputStr = new String(decodedData);
		System.err.println("加密前: " + inputStr + "==" + "解密后: " + outputStr);
		System.err.println(inputStr.equals(outputStr));
		System.err.println("私钥签名——公钥验证签名");
		// 产生签名
		String sign = RSACoder.sign(encodedData, privateKey);
		System.err.println("签名:" + sign);
		// 验证签名
		boolean status = RSACoder.verify(encodedData, publicKey, sign);
		System.err.println("状态:" + status);
 
 
	}
 
	public static void main(String[] rags) throws Exception {
		Map<String, Object> keyMap = RSACoder.initKey();
		String publicKey = RSACoder.getPublicKey(keyMap);
		String privateKey = RSACoder.getPrivateKey(keyMap);
		System.err.println("公钥: nr" + publicKey);
		System.err.println("私钥: nr" + privateKey);
		testEncode(publicKey, privateKey);
		testSign(publicKey, privateKey);
 
	}
 
}

标题: JAVA RSA加密解决及数字签名实现代码
作者:TravelEngineers
地址:https://www.mycitymemory.com/articles/2019/07/21/1563698485548.html
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