以下是php封裝好的類，引入即可使用

<?php /*** 作者：pjp* 郵箱：vippjp@163.com*/ class RSA{private $privateKey='';//私鑰（用于用戶加密）private $publicKey='';//公鑰（用于服務端數據解密）public function __construct(){$this->privateKey = openssl_pkey_get_private(file_get_contents('php_private.pem'));//私鑰，用于加密$this->publicKey = openssl_pkey_get_public(file_get_contents('php_public.pem'));//公鑰，用于解密}/*** 私鑰加密* @param 原始數據 $data* @return 密文結果 string*/public function encryptByPrivateKey($data) {openssl_private_encrypt($data,$encrypted,$this->privateKey,OPENSSL_PKCS1_PADDING);//私鑰加密$encrypted = base64_encode($encrypted);//加密后的內容通常含有特殊字符，需要編碼轉換下，在網絡間通過url傳輸時要注意base64編碼是否是url安全的return $encrypted;}/*** 私鑰解密* @param 密文數據 $data* @return 原文數據結果 string*/public function decryptByPrivateKey($data){$data = base64_decode($data);openssl_private_decrypt($data,$encrypted,$this->privateKey,OPENSSL_PKCS1_PADDING);//私鑰解密return $encrypted;}/*** 私鑰簽名* @param unknown $data*/public function signByPrivateKey($data){openssl_sign($data, $signature, $this->privateKey);$encrypted = base64_encode($signature);//加密后的內容通常含有特殊字符，需要編碼轉換下，在網絡間通過url傳輸時要注意base64編碼是否是url安全的return $encrypted;}/*** 公鑰加密* @param 原文數據 $data* @return 加密結果 string*/public function encryptByPublicKey($data) {openssl_public_encrypt($data,$decrypted,$this->publicKey,OPENSSL_PKCS1_PADDING);//公鑰加密return base64_encode($decrypted);}/*** 公鑰解密* @param 密文數據 $data* @return 原文結果 string*/public function decryptByPublicKey($data) {$data = base64_decode($data);openssl_public_decrypt($data,$decrypted,$this->publicKey,OPENSSL_PKCS1_PADDING);//公鑰解密return $decrypted;}/*** 公鑰驗簽* @param unknown $data* @param unknown $sign*/public function verifyByPublicKey($data,$sign){$sign = base64_decode($sign);return openssl_verify($data, $sign, $this->publicKey);}public function __destruct(){openssl_free_key($this->privateKey);openssl_free_key($this->publicKey);} }

php公鑰文件內容(php_public.pem)

公鑰和私鑰皆可自己重新生成

-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCm1YchJdHVy9iXsDfQfMEB2mdO 5wuaEiqUEerHO7HbKKkvhuIfc7haQV5bKTiKZ76FnkkXJMF+onMrQrrqk4TiWlYZ oilesPM88jr01Z9MmhzKV7vWboVhYcd8cw2Mua0HwAMyl9TDt5OLWmT00C4/Lu72 lRL21avxRTvmDQoAqQIDAQAB -----END PUBLIC KEY-----

php私鑰文件內容(php_private.pem)

-----BEGIN PRIVATE KEY----- MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAKbVhyEl0dXL2Jew N9B8wQHaZ07nC5oSKpQR6sc7sdsoqS+G4h9zuFpBXlspOIpnvoWeSRckwX6icytC uuqThOJaVhmiKV6w8zzyOvTVn0yaHMpXu9ZuhWFhx3xzDYy5rQfAAzKX1MO3k4ta ZPTQLj8u7vaVEvbVq/FFO+YNCgCpAgMBAAECgYB1x4s1eJiyAc4wEITm2Bv+Lez/ BBfptmd+z0NbUiZW3VbLqcLbh3ufpERzwR8cfu8/L6bUAuvjddYutVZ2Ip0Nd7dG 5rrktH+7R8UT89fn87bUa5NlLee+egyoz/PJ63X4JjEg5OJbkXMbK4YrTypS0IAx nZv+7BeSsCrzNlpWAQJBANgmHMDNrIWvU3qVf7u8SS/g+WrlvKMWOXtYjH2OqWoO Vtmh4Or1PbaPIMnPAXFYiYYW8wcLYnVmVCez5qaysWkCQQDFl9XONZIMFAvdJ5S2 UFk63bEYtCroKZjddTlE6K/j+Vj2IaCFm94i4x1YzJR0KrykrtBTLRi7nuWmdJMJ r61BAkA7dxDGAk+KX9fJi8OedIh2AaDcxeOFwqGBy7Sq/kqhgNxn918XhOy7gtj0 bFzrP/5lw36M25b00XgpjBbSmaqxAkBnBN/TUHjh1T3OQ0m0uDWdjGI+KAlK3A04 QVrng43ZBXMNeMDRiE+Lzu/JEXjBDFsoXYB+LT/86j5/x721yiNBAkEAgi0F5BvA wYZQXqAx3iyuj8R9uUKpLePafyBRHnLNrFux2VD0ZX3pXCmfDDmtM/NMO491dI84 6NbVOvxWcNPQ/Q== -----END PRIVATE KEY-----

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以下是java封裝好的方法

/*** 作者：pjp* 郵箱：vippjp@163.com*/package crypt;import java.io.File; import java.io.FileReader; import java.io.IOException; import java.security.KeyFactory; 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 javax.crypto.Cipher;public class Rsa {private String priKey;private String pubKey;public static void main(String[] args) {Rsa rsa = new Rsa();String str = "我要加密這段文字。";System.out.println("原文:"+"我要加密這段文字。");String crypt = rsa.encryptByPrivateKey(str);System.out.println("私鑰加密密文:"+crypt);String result = rsa.decryptByPublicKey(crypt);System.out.println("原文:"+result);System.out.println("---");str = "我要加密這段文字。";System.out.println("原文:"+"我要加密這段文字。");crypt = rsa.encryptByPublicKey(str);System.out.println("公鑰加密密文:"+crypt);result = rsa.decryptByPrivateKey(crypt);System.out.println("原文:"+result);System.out.println("---");str = "我要簽名這段文字。";System.out.println("原文："+str);String str1 = rsa.signByPrivateKey(str);System.out.println("簽名結果："+str1);if(rsa.verifyByPublicKey(str1, str)){System.out.println("成功");} else {System.out.println("失敗");}}public Rsa(){priKey = readStringFromFile("java_private.pem");pubKey = readStringFromFile("java_public.pem");}/*** 使用私鑰加密* @see decByPriKey*/public String encryptByPrivateKey(String data) {// 加密String str = "";try {byte[] pribyte = base64decode(priKey.trim());PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");c1.init(Cipher.ENCRYPT_MODE, privateKey);str = base64encode(c1.doFinal(data.getBytes()));} catch (Exception e) {e.printStackTrace();}return str;}/*** 使用私鑰解密* @see decByPriKey*/public String decryptByPrivateKey(String data) {// 加密String str = "";try {byte[] pribyte = base64decode(priKey.trim());PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");c1.init(Cipher.DECRYPT_MODE, privateKey);byte[] temp = c1.doFinal(base64decode(data));str = new String(temp);} catch (Exception e) {e.printStackTrace();}return str;}/*** 使用公鑰加密* @see decByPriKey*/public String encryptByPublicKey(String data) {// 加密String str = "";try {byte[] pubbyte = base64decode(pubKey.trim());X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");c1.init(Cipher.ENCRYPT_MODE, rsaPubKey);str = base64encode(c1.doFinal(data.getBytes()));} catch (Exception e) {e.printStackTrace();}return str;}/*** 使用公鑰解密* @see decByPriKey*/public String decryptByPublicKey(String data) {// 加密String str = "";try {byte[] pubbyte = base64decode(pubKey.trim());X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");c1.init(Cipher.DECRYPT_MODE, rsaPubKey);byte[] temp = c1.doFinal(base64decode(data));str = new String(temp);} catch (Exception e) {e.printStackTrace();}return str;}/*** 本方法使用SHA1withRSA簽名算法產生簽名* @param String src 簽名的原字符串* @return String 簽名的返回結果(16進制編碼)。當產生簽名出錯的時候，返回null。*/public String signByPrivateKey(String src) {try {Signature sigEng = Signature.getInstance("SHA1withRSA");byte[] pribyte = base64decode(priKey.trim());PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);sigEng.initSign(privateKey);sigEng.update(src.getBytes());byte[] signature = sigEng.sign();return base64encode(signature);} catch (Exception e) {e.printStackTrace();return null;}}/*** 使用共鑰驗證簽名* @param sign* @param src* @return*/public boolean verifyByPublicKey(String sign, String src) {try {Signature sigEng = Signature.getInstance("SHA1withRSA");byte[] pubbyte = base64decode(pubKey.trim());X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);KeyFactory fac = KeyFactory.getInstance("RSA");RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);sigEng.initVerify(rsaPubKey);sigEng.update(src.getBytes());byte[] sign1 = base64decode(sign);return sigEng.verify(sign1);} catch (Exception e) {e.printStackTrace();return false;}}/*** base64加密* @param bstr* @return*/@SuppressWarnings("restriction")private String base64encode(byte[] bstr) {String str = new sun.misc.BASE64Encoder().encode(bstr);str = str.replaceAll("\r\n", "").replaceAll("\r", "").replaceAll("\n", "");return str;}/*** base64解密* @param str* @return byte[]*/@SuppressWarnings("restriction")private byte[] base64decode(String str) {byte[] bt = null;try {sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();bt = decoder.decodeBuffer(str);} catch (IOException e) {e.printStackTrace();}return bt;}/*** 從文件中讀取所有字符串* @param fileName* @return String*/private String readStringFromFile(String fileName){StringBuffer str = new StringBuffer();try {File file = new File(fileName);FileReader fr = new FileReader(file);char[] temp = new char[1024];while (fr.read(temp) != -1) {str.append(temp);}fr.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return str.toString();} }

java公鑰文件內容(java_public.pem)

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCm1YchJdHVy9iXsDfQfMEB2mdO 5wuaEiqUEerHO7HbKKkvhuIfc7haQV5bKTiKZ76FnkkXJMF+onMrQrrqk4TiWlYZ oilesPM88jr01Z9MmhzKV7vWboVhYcd8cw2Mua0HwAMyl9TDt5OLWmT00C4/Lu72 lRL21avxRTvmDQoAqQIDAQAB

java私鑰文件內容(java_private.pem)

MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAKbVhyEl0dXL2Jew N9B8wQHaZ07nC5oSKpQR6sc7sdsoqS+G4h9zuFpBXlspOIpnvoWeSRckwX6icytC uuqThOJaVhmiKV6w8zzyOvTVn0yaHMpXu9ZuhWFhx3xzDYy5rQfAAzKX1MO3k4ta ZPTQLj8u7vaVEvbVq/FFO+YNCgCpAgMBAAECgYB1x4s1eJiyAc4wEITm2Bv+Lez/ BBfptmd+z0NbUiZW3VbLqcLbh3ufpERzwR8cfu8/L6bUAuvjddYutVZ2Ip0Nd7dG 5rrktH+7R8UT89fn87bUa5NlLee+egyoz/PJ63X4JjEg5OJbkXMbK4YrTypS0IAx nZv+7BeSsCrzNlpWAQJBANgmHMDNrIWvU3qVf7u8SS/g+WrlvKMWOXtYjH2OqWoO Vtmh4Or1PbaPIMnPAXFYiYYW8wcLYnVmVCez5qaysWkCQQDFl9XONZIMFAvdJ5S2 UFk63bEYtCroKZjddTlE6K/j+Vj2IaCFm94i4x1YzJR0KrykrtBTLRi7nuWmdJMJ r61BAkA7dxDGAk+KX9fJi8OedIh2AaDcxeOFwqGBy7Sq/kqhgNxn918XhOy7gtj0 bFzrP/5lw36M25b00XgpjBbSmaqxAkBnBN/TUHjh1T3OQ0m0uDWdjGI+KAlK3A04 QVrng43ZBXMNeMDRiE+Lzu/JEXjBDFsoXYB+LT/86j5/x721yiNBAkEAgi0F5BvA wYZQXqAx3iyuj8R9uUKpLePafyBRHnLNrFux2VD0ZX3pXCmfDDmtM/NMO491dI84 6NbVOvxWcNPQ/Q==

說明：

java和php的RSA加解密版本已全部通過測試。并且可以相互加解密。
私鑰是服務器保留，公鑰可以發放給對應的客戶端，甚至可以是公共的。
采用私鑰加密-》公鑰解密 和 公鑰加密-》私鑰解密 的加密方式。
但是如果客戶端是需要更高安全性的支付系統，那么應該采用兩對密鑰。
每一方分別是自己的私鑰和對方的公鑰，采用私鑰加密并簽名-》公鑰解密并驗簽的方式。

注意：給出的是兩個版本的兩對密鑰，實際上只是一對密鑰。區別是java的密鑰去掉了頭尾注釋。而PHP的密鑰保留了頭尾注釋。

轉自：https://blog.csdn.net/panjiapengfly/article/details/75318930

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