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rsa学习笔记

非对称加密

整理一下关于加密的用法，方便以后查看。

开发平台算法名称	标准签名算法名称	备注
RSA2	SHA256WithRSA	（强烈推荐使用），强制要求RSA密钥的长度至少为2048
RSA	SHA1WithRSA	对RSA密钥的长度不限制，推荐使用2048位以上

什么是非对称加密？：「非对称加密算法」需要两个密钥：公钥（publickey）和私钥（privatekey）。公钥与私钥是一对，如果用公钥对数据进行加密，只有用对应的私钥才能解密；如果用私钥对数据进行加密，那么只有用对应的公钥才能解密。因为加密和解密使用的是两个不同的密钥，所以这种算法叫作非对称加密算法。RSA是目前最有影响力的公钥加密算法。。RSA算法基于一个十分简单的数论事实：将两个大素数相乘十分容易，但那时想要对其乘积进行因式分解却极其困难，因此可以将乘积公开作为加密密钥。
加密与签名：
加密与签名虽然都会使用RSA的一些算法，但是这两个不能混为一谈，是不一样的（主要体现在用途不一样）。加密的作用是为了防止明文内容被人看到，验签是为了防止明文内容被人篡改。
公钥和私钥都能用来加密和解密，通常情况下使用公钥加密，私钥解密。私钥和公钥是成对匹配的，完全匹配的时候才能正确的解密出明文，否则不能获取到正确的密文，所以私钥公钥都能用来加密和解密。不过大多数情况下都是用公钥加密然后用私钥解密,这样能保证能保证明文只能被私钥持有者获取到了。反过来私钥加密公钥公钥解密的话，那么所有持有公钥的人都能获取明文了。公钥和私钥是可以相互推导的，根据私钥，你可以很容易的算出公钥，但是根据公钥，你却很难很难算出私钥，在互联网上，私钥一般由服务器掌握，公钥则由客户端使用。根据公钥，理论上需要花费地球上所有的计算机计算数万年才能算出私钥，所以认为是非常安全的。
openssl:SSL的全名叫做secure socket layer(安全套接字层)，最开始是由一家叫网景的互联网公司开发出来，主要是防止信息在互联网上传输的时候不被窃听或者篡改，后来网景公司提交SSL给ISOC组织做标准化，改名为TLS。openssl 是目前最流行的 SSL 密码库工具，其提供了一个通用、健壮、功能完备的工具套件，用以支持SSL/TLS 协议的实现。默认情况下，openssl 输出格式为 PKCS#1-PEM
生成公钥，私钥：安装OpenSSL

openssl
# 生成私钥
genrsa -out id_rsa_private 2048
# 生成私钥(把RSA私钥转换成PKCS8格式)
pkcs8 -topk8 -inform PEM -in id_rsa_private -outform pem -nocrypt -out id_rsa_private_pkcs
# 生成公钥
rsa -in id_rsa_private -pubout -out id_rsa_public.pub

DER 和 PEM 编码
DER：基于二进制的编码。可以用CER或者CRT作为扩展名的的整数。比较合适的说法是“我有一个DER编码的证书”，而不是“我有一个DER证书”。【编码规则参考】
PEM：基于ASCII(Base64)的编码。OpenSSL 使用 PEM 文件格式存储证书和密钥。【编码规则参考】
PEM 实质上是 base64 编码的二进制内容，再进行增加或裁剪特殊字符-、n、r、begin信息、end信息等，如

-----BEGIN CERTIFICATE-----
内容
-----END CERTIFICATE-----

PKCS(The Public-Key Cryptography Standards) 由美国RSA公司及其合作伙伴制定的一组公钥密码学标准，其中包括证书申请、证书更新、证书作废表发布、扩展证书内容以及数字签名、数字信封的格式等方面的一系列相关协议。版本：现有PCKS1，PCKS3，PCKS5，PKCS6，PKCS7，PKCS8，PKCS9，PKCS10，PKCS11，PKCS12，PKCS13，PKCS14，PKCS15 等 13个版本
常用：PCKS1 和 PCKS8，本文使用 PCKS8 标准
注：由于PKCS内容规范设计二进制，不方便使用，所以一般转成base64 后，用 pem 格式规范显示

pcks1的pem格式头

//公钥
-----BEGIN RSA PUBLIC KEY-----
MEgCQQCpb53RwojJX+lxHiEMfNmixx+eIV+u+d9e61Ecx8MVBW0tzAoxTpdTKrgN
9hdBqaP6rtQMxOp/4++C5+3zh6D1AgMBAAE=
-----END RSA PUBLIC KEY-----
//私钥
-----BEGIN RSA PRIVATE KEY-----
MIIBPAIBAAJBAKlvndHCiMlf6XEeIQx82aLHH54hX675317rURzHwxUFbS3MCjFO
l1MquA32F0Gpo/qu1AzE6n/j74Ln7fOHoPUCAwEAAQJAJO8tyeHMC4may4uzzJMS
pgcd/0xrHSte48QMBGgPQG95imYXELKQUV2rjzsua9xJP5huQjhe+qrmBpEqrtf7
wQIhANccK0zuFaH4CoIuKsp92YB6OGwndy6UJaiX2RoUw0V5AiEAyaTTkar73r4d
OB2s4Ofj+UkGX/aspp0dM+7V5HathF0CIQCezlYNSmvAEr23U9wVeAmd9x02g4BS
a97Nc6U8wv1SiQIhAKap7ZTA1l1MlaoEHRfnkq5AhVxb7mfoBHMgPPoQfWqhAiEA
npkku9LfP2mlCCB85/zxsUehZOwoMVLlF2dSLWsrURs=
-----END RSA PRIVATE KEY-----

PCKS8 的pem格式头

//公钥
-----BEGIN PUBLIC KEY-----
MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKzY3F21g7UWaTcIk/ltUy4LuuHK5Hhl
9ZpdxDr4+WA7pNwhCzhgBKbWUa+XotUYet841I2mYPJ6+6X32LwotF0CAwEAAQ==
-----END PUBLIC KEY-----
//私钥
-----BEGIN PRIVATE KEY-----
MIIBVgIBADANBgkqhkiG9w0BAQEFAASCAUAwggE8AgEAAkEArNjcXbWDtRZpNwiT
+W1TLgu64crkeGX1ml3EOvj5YDuk3CELOGAEptZRr5ei1Rh63zjUjaZg8nr7pffY
vCi0XQIDAQABAkBUJ3GDHnD1peesJ70D37pz3LosXMBH7jxZ3/U+USH5O8M7ixzt
lpYa+ITcuL0MKxvVyVYw5Pvaui1+Nq9LV17xAiEA5VMCIgtn3WFEOpP+sVhHlqPc
VbTfE3g0RlDfUt/sQ5sCIQDA9AiJ65G3pHJJxYNc9RB/lVav3anFkbgnGKolPw8T
ZwIhAIs7QLpGzoLcgT5HiIVIIf7V8fqfXClH/AUNKOn6RkotAiEAo6HQY/ZMeyqQ
aZOA1aJWPXxOKZKX2R68xxsZn8Ccbl0CIQDck74y8SzLRSBB6JgVZ6NoWkWI5tyj
V8RFCZU9VUinQA==
-----END PRIVATE KEY-----

net,ios(php)中rsa加解密使用的是pkcs1，而java使用的是pkcs8

如果是按1024取模(通常都是1024)，pkcs1格式的私钥长度应该是812。如果是pkcs8的格式的密钥长度为861。
示例代码：

php类文件

<?php

/**
 * Class Rsa加密解密类
 */

/*使用示例
$rsa = new Rsa();
$rsa->privateKey = '私钥字符串';
$rsa->encodeByPrivateKey('要加密的字符串');
$rsa->publicKey = '公钥字符串';
$rsa->decodeByPublicKey('要解密的字符串');
*/

class Rsa
{

    public $publicKey; // 公钥内容，不要头尾和换行符，只要内容
    public $privateKey; // 私钥内容，不要头尾和换行符，只要内容

    /**
     * 获取完整的私钥
     * @return bool|resource
     */
    public function getPrivateKey()
    {
        $pem = "-----BEGIN RSA PRIVATE KEY-----" . PHP_EOL;

        $pem .= chunk_split($this->privateKey, 64, PHP_EOL);

        $pem .= "-----END RSA PRIVATE KEY-----" . PHP_EOL;

        return openssl_pkey_get_private($pem);
    }

    /**
     * 获取完整的公钥
     * @return bool|resource
     */
    public function getPublicKey()
    {
        $pem = "-----BEGIN PUBLIC KEY-----" . PHP_EOL;

        $pem .= chunk_split($this->publicKey, 64, PHP_EOL);

        $pem .= "-----END PUBLIC KEY-----" . PHP_EOL;

        return openssl_pkey_get_public($pem);
    }

    /**
     * 私钥加密
     * @param string $data 要加密的数据
     * @return mixed
     */
    public function encodeByPrivateKey($data)
    {
        $crypto = '';
        $length = $this->_getKeyLength() / 8 - 11;

        foreach (str_split($data, $length) as $chunk) {
            openssl_private_encrypt($chunk, $encrypted, $this->getPrivateKey());
            $crypto .= $encrypted;
        }

        return $this->_base64Encode($crypto);
    }
    /**
     * 公钥解密
     * @param string $data 要解密的字符串
     * @return mixed
     */
    public function decodeByPublicKey($data)
    {
        $crypto = '';
        $length = $this->_getKeyLength() / 8;

        foreach (str_split($this->_base64Decode($data), $length) as $chunk) {
            openssl_public_decrypt($chunk, $decrypted, $this->getPublicKey());
            $crypto .= $decrypted;
        }

        return $crypto;
    }
	/**
	* 私钥解密
	* @param string $data 要解密的字符串
	* @return mixed
	*/
	public function decodeByPrivateKey($data)
	{
	$crypto = '';
	$length = $this->_getKeyLength() / 8;

	foreach (str_split($this->_base64Decode($data), $length) as $chunk) {
	openssl_private_decrypt($chunk, $decrypted, $this->getPrivateKey());
	$crypto .= $decrypted;
	}

	return $crypto;
	}
	
    /**
     * 获取密钥长度
     * @return mixed
     */
    private function _getKeyLength()
    {
        return openssl_pkey_get_details($this->getPublicKey())['bits'];
    }

    /**
     * @param string $value 待加密字符串
     * @return mixed
     */
    private function _base64Encode($value) {
        $data = base64_encode($value);
        return str_replace(['+', '/', '='], ['-', '_', ''], $data);
    }

    /**
     * @param string $value 待解密字符串
     * @return bool|string
     */
    private function _base64Decode($value) {
        $data = str_replace(['-', '_'], ['+', '/'], $value);

        if ($mod4 = strlen($data) % 4) {
            $data .= substr('====', $mod4);
        }

        return base64_decode($data);
    }

}

示例

$rsa1 = new Rsahelper();
	$rsa1->publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCLUWG...";
	$rsa1->privateKey = "MIICWwIBAAKBgQCLUWGcpISEDgAoTGR5kK/J...";
	//$res1->privateKey = "MIICdQIBADANBg...";
	$pu_key = $rsa1->getPublicKey();
	$pi_key = $rsa1->getPrivateKey();
	//print_r($pi_key);die;
	$mi = $rsa1->encodeByPrivateKey($mi);
	//dump($mi);die;
	$rmi = $rsa1->decodeByPublicKey($mi);

java rsa加密

类文件

package com.localhost;

import org.apache.shiro.codec.Base64;

import java.io.ByteArrayOutputStream;
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;

/**
 * RSA工具类
 * Class RSAUtils
 * @author dbn
 */
class RSAUtils {

    /**
     * 签名算法
     */
    private static final String KEY_ALGORITHM = "RSA";
    private static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /**
     * 获取公钥的key
     */
    private static final String PUBLIC_KEY = "RSAPublicKey";

    /**
     * 获取私钥的key
     */
    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /**
     * RSA最大加密明文大小
     */
    private static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    private static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * 数据编码
     */
    private static final String ENCODING = "UTF-8";

    /**
     * 生成密钥对(公钥和私钥)
     * @return 密钥对 Map 对象
     * @throws Exception
     */
    static Map<String, Object> resetGenKeyPair() throws Exception {
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        keyPairGen.initialize(1024);

        KeyPair keyPair            = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey     = (RSAPublicKey) keyPair.getPublic();
        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;
    }

    /**
     * 获取公钥
     * @param keyMap 密钥对 Map 对象
     * @return 公钥
     * @throws Exception
     */
    static String getPublicKey(Map<String, Object> keyMap) throws Exception {
        Key key = (Key) keyMap.get(PUBLIC_KEY);
        return Base64.encodeToString(key.getEncoded());
    }

    /**
     * 获取私钥
     * @param keyMap 密钥对 Map 对象
     * @return 私钥
     * @throws Exception
     */
    static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
        Key key = (Key) keyMap.get(PRIVATE_KEY);
        return Base64.encodeToString(key.getEncoded());
    }

    /**
     * 私钥加签
     * @param data 原始数据
     * @param privateKey 私钥
     * @return 加密数据
     * @throws Exception
     */
    static String sign(String data, String privateKey) throws Exception {
        byte[] keyBytes = Base64.decode(privateKey);
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        PrivateKey privateK   = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature   = Signature.getInstance(SIGNATURE_ALGORITHM);

        signature.initSign(privateK);
        signature.update(data.getBytes(ENCODING));
        return Base64.encodeToString(signature.sign());
    }

    /**
     * 公钥验签
     * @param data 原始数据
     * @param publicKey 公钥
     * @param sign 数据签名
     * @return 验签结果
     * @throws Exception
     */
    static boolean verifySign(String data, String publicKey, String sign) throws Exception {
        try {
            byte[] keyBytes = Base64.decode(publicKey);

            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory      = KeyFactory.getInstance(KEY_ALGORITHM);
            PublicKey publicK          = keyFactory.generatePublic(keySpec);
            Signature signature        = Signature.getInstance(SIGNATURE_ALGORITHM);

            signature.initVerify(publicK);
            signature.update(data.getBytes(ENCODING));

            return signature.verify(Base64.decode(sign));
        } catch (Exception e) {
            throw e;
        }
    }

    /**
     * 私钥加密
     * @param dataStr 原始数据
     * @param privateKey 私钥
     * @return 加密数据
     * @throws Exception
     */
    static String encryptByPrivateKey(String dataStr, String privateKey) throws Exception {
        byte[] data     = dataStr.getBytes(ENCODING);
        byte[] keyBytes = Base64.decode(privateKey);

        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK          = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher         = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.ENCRYPT_MODE, privateK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return Base64.encodeToString(encryptedData);
    }

    /**
     * 公钥解密
     * @param encryptedDataStr 加密数据
     * @param publicKey 公钥
     * @return 解密后数据
     * @throws Exception
     */
    static String decryptByPublicKey(String encryptedDataStr, String publicKey) throws Exception {
        byte[] encryptedData = Base64.decode(encryptedDataStr);
        byte[] keyBytes      = Base64.decode(publicKey);

        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.DECRYPT_MODE, publicK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        return new String(decryptedData, ENCODING);
    }

    /**
     * 公钥加密
     * @param dataStr 原始数据
     * @param publicKey 公钥
     * @return 加密数据
     * @throws Exception
     */
    static String encryptByPublicKey(String dataStr, String publicKey) throws Exception {
        byte[] data     = dataStr.getBytes(ENCODING);
        byte[] keyBytes = Base64.decode(publicKey);

        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key publicK           = keyFactory.generatePublic(x509KeySpec);
        Cipher cipher         = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.ENCRYPT_MODE, publicK);
        int inputLen = data.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        return Base64.encodeToString(encryptedData);
    }

    /**
     * 私钥解密
     * @param encryptedDataStr 加密数据
     * @param privateKey 私钥
     * @return 解密后数据
     * @throws Exception
     */
    static String decryptByPrivateKey(String encryptedDataStr, String privateKey) throws Exception {
        byte[] encryptedData = Base64.decode(encryptedDataStr);
        byte[] keyBytes      = Base64.decode(privateKey);

        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
        Key privateK          = keyFactory.generatePrivate(pkcs8KeySpec);
        Cipher cipher         = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.DECRYPT_MODE, privateK);
        int inputLen = encryptedData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        return new String(decryptedData, ENCODING);
    }

}

示例：

package com.localhost;

import java.util.Map;

public class Test {

	public static void main(String[] args) throws Exception {

		// 生成新的公私钥
		Map<String, Object> genKeyPair = RSAUtils.resetGenKeyPair();

		// 获取公钥
		//String publicKey = RSAUtils.getPublicKey(genKeyPair);
		//System.out.println("------- 公钥 -------");
		//System.out.println(publicKey);

		// 获取私钥
		//String privateKey = RSAUtils.getPrivateKey(genKeyPair);
		//System.out.println("------- 私钥 -------");
		//System.out.println(privateKey);

		String publicKey = "MIGfMA0GCSqGSIb3DQEBA...";
		String privateKey = "MIICdQIBADANBgkqhkiG9w0BAQEFAA...";

		// 加密数据
		//String data = "{"agencyCustSno":"test1","sno":"1234","tradeDate":"2021-04-07 15:32:31","transAmount":"100","transFee":"2","transFeeRate":"0.02","transType":"PURCHASE"}";
		String data = "2";
		System.out.println("------- 加密字符串 -------");
		System.out.println(data);

		// 私钥加签
		String sign = RSAUtils.sign(data, privateKey);
//		String sign = "JAkJLORVds3LC8zv7eaJ3MCWkIzEuwnrlzs7y7zNXYZ8TXRXGJVFBuJ6bhYK5lZMvbHOANCTQSUBQgDUN9Rra38YJW+MG16DxdDvRZlZ8FszySH+5hPuQNGgKkwzdDhabH7/7VhemXWq9VRpkyHxPSnn69I3vhcmba+lGbq2HM4=";
		System.out.println("------- 数据签名 -------");
		System.out.println(sign);

		// 验证签名
		boolean verifySign = RSAUtils.verifySign(data, publicKey, sign);
		System.out.println("------- 验证签名 -------");
		System.out.println(verifySign);

		// 私钥加密
		String priEncrypt = RSAUtils.encryptByPrivateKey(data, privateKey);
		//String priEncrypt = "XUal_GLSl0iE5bwV5r24TNqzmsPXQDMSQTRww_d1XSf4ddqo5fAIZxnYI0roYTEqOE3Y6tcNVQP6Bsqmj23Nl4Ayt58G9KfInmxn_jV9DFRiBI17araYQZn3ZFQ3a1Ne5HtMcXXRuu9C_cx678IFlH3pNGSh8XHkJCONFKcTGhZiZZbWpeJjonLsMQXYlyJs2fKD5uRg1llKZEzT2W0gweCN1THJ2tRxGUy3YKczH-KFJJ4AbFOziKf5mZUrU9VTzP10l1rpKVS1EK7sij2ytOonVQNrLsJczyzsNZG4ylF3dMBlBHiZ4mrPv5cnl6QcC3o75aF0qNl7OeP1ywtSFA";
		System.out.println("------- 私钥加密 -------");
		System.out.println(priEncrypt);

		// 公钥解密
		String pubDecrypt = RSAUtils.decryptByPublicKey(priEncrypt, publicKey);
		System.out.println("------- 公钥解密 -------");
		System.out.println(pubDecrypt);

		// 公钥加密
		String pubEncrypt = RSAUtils.encryptByPublicKey(data, publicKey);
		System.out.println("------- 公钥加密 -------");
		System.out.println(pubEncrypt);

		// 私钥解密
		String priDecrypt = RSAUtils.decryptByPrivateKey(pubEncrypt, privateKey);
		System.out.println("------- 私钥解密 -------");
		System.out.println(priDecrypt);
	}
}

java 与PHP 互相通信时注意私钥格式转换与base64编码符号转换

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原文地址：https://www.cnblogs.com/jigr/p/14776319.html