iOS RSA加密和解密

MAC OS自带了OpenSSL，而不需要像支付宝sdk中的RSA加密写许多代码，而且有些好事看得不太懂的代码。下面将介绍用Mac终端5句指令生成证书

一、使用openssl终端指令生成公钥和私钥证书，最后需要得到公钥证书（public_key.der）和私钥证书（private_key.p12）这两个证书供iOS端加、解密使用。（rsa_public_key.pem）和（pkcs8_private_key.pem）这两个供Android端使用，这些证书是从同一个私钥证书（private_key.pem）中导出的。Android端的加密数据，可以在Android和iOS端都可以解密，iOS端加密的数据，可以在Android端和iOS端解密。

1，打开终端前，在桌面新建文件夹 私钥公钥证书（用来存放证书）

2，打开终端cd到"私钥公钥证书"文件目录（在cd后空格直接拖文件到终端）回车

3，依次输入下面的指令：（注意：在输入第二句指令的时候，会出现填写一些和证书相关的内容，可随意填，主要是密码要记住。）

// 生成RSA密钥对 1024可换成2048增加安全性

openssl genrsa -out private_key.pem 1024

// 创建认证需要的文件：rsacertreq.csr

openssl req -new -key private_key.pem -out rsaCertReq.csr

// 创建使用X509：rsacert.crt认证,3650是证书有天数，这里表示是10年

openssl x509 -req -days 3650 -in rsaCertReq.csr -signkey private_key.pem -out rsaCert.crt

// 创建公共public_key.der

openssl x509 -outform der -in rsaCert.crt -out public_key.der

// 创建private_key.p12 文件。请记住你的密码

openssl pkcs12 -export -out private_key.p12 -inkey private_key.pem -in rsaCert.crt

运行后的终端：

下面两句指令是生成Android端证书文件的指令：

// 导出公钥pem文件

openssl rsa -in private_key.pem -out rsa_public_key.pem -pubout

//  导出私钥文件

openssl pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt

生成的证书如下，最后使用的就是红色框中（iOS端使用）的两个，注意保存好自己的私钥：

证书已生成完成

二、实现rsa加密解密

1，把上面截图中的两个证书直接拖到工程中

2，添加系统安全框架：Security.framework (Build Phases->Link Binary With Libraries() 点击+号，搜索最后Add)

3，添加加密，解密代码文件免费下载：下载，下载完成后解压，解压的到的文件导入工程，导入时选择：

4，导入头文件：#import"RSA_Encryptor.h"

加密方法：

// 获取证书，加密
RSA_Encryptor *rsa = [[RSA_Encryptor alloc]init];
    
    // 加密
    NSString *publicKeyPath = [[NSBundle mainBundle] pathForResource:@"public_key" ofType:@"der"];
    NSLog(@"证书路径 key: %@", publicKeyPath);
    [rsa loadPublicKeyFromFile:publicKeyPath];
    NSString *securityText = @"调试 ~";
    NSString *encryptedString = [rsa rsaEncryptString:securityText];
    NSLog(@"加密: %@", encryptedString);

解密方法：

// 解密
    [rsa loadPrivateKeyFromFile:[[NSBundle mainBundle] pathForResource:@"private_key" ofType:@"p12"] password:@"证书密码"];
    NSString *decryptedString = [rsa rsaDecryptString:encryptedString];
    NSLog(@"解密: %@", decryptedString);

如果只加密，不解密，会出现如下崩溃情况：

最后的输出：

下面是Android端Java代码：

RSAEncryptor.java：

package com.modules.Encryptor;  
  
import java.io.BufferedReader;  
import java.io.FileReader;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.security.InvalidKeyException;  
import java.security.KeyFactory;  
import java.security.KeyPair;  
import java.security.KeyPairGenerator;  
import java.security.NoSuchAlgorithmException;  
import java.security.SecureRandom;  
import java.security.interfaces.RSAPrivateKey;  
import java.security.interfaces.RSAPublicKey;  
import java.security.spec.InvalidKeySpecException;  
import java.security.spec.PKCS8EncodedKeySpec;  
import java.security.spec.X509EncodedKeySpec;  
import java.util.ArrayList;  
import java.util.List;  
  
import javax.crypto.BadPaddingException;  
import javax.crypto.Cipher;  
import javax.crypto.IllegalBlockSizeException;  
import javax.crypto.NoSuchPaddingException;  
  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
  
public class RSAEncryptor {  
  
      
    public static void main(String[] args){    
          
        String privateKeyPath = "/Users/Isaacs/Desktop/RSA_KEYS/rsa_public_key.pem";        // replace your public key path here  
        String publicKeyPath =  "/Users/Isaacs/Desktop/RSA_KEYS/pkcs8_private_key.pem";     // replace your private path here  
        RSAEncryptor rsaEncryptor = new RSAEncryptor(privateKeyPath, publicKeyPath);  
  
        try {  
              
            String test = "JAVA";  
            String testRSAEnWith64 = rsaEncryptor.encryptWithBase64(test);  
            String testRSADeWith64 = rsaEncryptor.decryptWithBase64(testRSAEnWith64);  
            System.out.println("\nEncrypt: \n" + testRSAEnWith64);  
            System.out.println("\nDecrypt: \n" + testRSADeWith64);  
              
            // NSLog the encrypt string from Xcode , and paste it here.  
            // 请粘贴来自IOS端加密后的字符串  
//            String rsaBase46StringFromIOS =  
//                    "nIIV7fVsHe8QquUbciMYbbumoMtbBuLsCr2yMB/WAhm+S/kGRPlf+k2GH8imZIYQ" + "\r" +  
//                    "QBDssVLQmS392QlxS87hnwMRJIzWw6vdRv/k79TgTfu6tI/9QTqIOvNlQIqtIcVm" + "\r" +  
//                    "R/suvydoymKgdlB+ce5/tHSxfqEOLLrL1Zl2PqJSP4A=";  
//              
//            String decryptStringFromIOS = rsaEncryptor.decryptWithBase64(rsaBase46StringFromIOS);  
//            System.out.println("Decrypt result from ios client: \n" + decryptStringFromIOS);  
              
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
  
    }  
  
  
  
  
  
    /** 
     * @param publicKeyFilePath      
     * @param privateKeyFilePath     
     */  
    public RSAEncryptor(String publicKeyFilePath, String privateKeyFilePath) throws Exception {  
        String public_key = getKeyFromFile(publicKeyFilePath);  
        String private_key = getKeyFromFile(privateKeyFilePath);  
        loadPublicKey(public_key);    
        loadPrivateKey(private_key);    
    }  
    public RSAEncryptor() {  
        // load the PublicKey and PrivateKey manually  
    }  
      
      
    public String getKeyFromFile(String filePath) throws Exception {  
        BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));  
          
        String line = null;  
        List list = new ArrayList();  
        while ((line = bufferedReader.readLine()) != null){  
            list.add(line);  
        }  
          
        // remove the firt line and last line  
        StringBuilder stringBuilder = new StringBuilder();  
        for (int i = 1; i < list.size() - 1; i++) {  
            stringBuilder.append(list.get(i)).append("\r");  
        }  
          
        String key = stringBuilder.toString();  
        return key;  
    }  
      
    public String decryptWithBase64(String base64String) throws Exception {  
        //  http://commons.apache.org/proper/commons-codec/ : org.apache.commons.codec.binary.Base64  
        // sun.misc.BASE64Decoder  
        byte[] binaryData = decrypt(getPrivateKey(), new BASE64Decoder().decodeBuffer(base64String) /*org.apache.commons.codec.binary.Base64.decodeBase64(base46String.getBytes())*/);  
        String string = new String(binaryData);  
        return string;  
    }  
      
    public String encryptWithBase64(String string) throws Exception {  
        //  http://commons.apache.org/proper/commons-codec/ : org.apache.commons.codec.binary.Base64  
        // sun.misc.BASE64Encoder  
        byte[] binaryData = encrypt(getPublicKey(), string.getBytes());  
        String base64String = new BASE64Encoder().encodeBuffer(binaryData) /* org.apache.commons.codec.binary.Base64.encodeBase64(binaryData) */;  
        return base64String;  
    }  
    
      
      
    // convenient properties  
    public static RSAEncryptor sharedInstance = null;  
    public static void setSharedInstance (RSAEncryptor rsaEncryptor) {  
        sharedInstance = rsaEncryptor;  
    }  
      
      
      
      
    // From: http://blog.csdn.net/chaijunkun/article/details/7275632  
  
    /**  
     * 私钥  
     */    
    private RSAPrivateKey privateKey;    
    
    /**  
     * 公钥  
     */    
    private RSAPublicKey publicKey;    
        
    /**  
     * 获取私钥  
     * @return 当前的私钥对象  
     */    
    public RSAPrivateKey getPrivateKey() {    
        return privateKey;    
    }    
    
    /**  
     * 获取公钥  
     * @return 当前的公钥对象  
     */    
    public RSAPublicKey getPublicKey() {    
        return publicKey;    
    }    
    
    /**  
     * 随机生成密钥对  
     */    
    public void genKeyPair(){    
        KeyPairGenerator keyPairGen= null;    
        try {    
            keyPairGen= KeyPairGenerator.getInstance("RSA");    
        } catch (NoSuchAlgorithmException e) {    
            e.printStackTrace();    
        }    
        keyPairGen.initialize(1024, new SecureRandom());    
        KeyPair keyPair= keyPairGen.generateKeyPair();    
        this.privateKey= (RSAPrivateKey) keyPair.getPrivate();    
        this.publicKey= (RSAPublicKey) keyPair.getPublic();    
    }    
    
    /**  
     * 从文件中输入流中加载公钥  
     * @param in 公钥输入流  
     * @throws Exception 加载公钥时产生的异常  
     */    
    public void loadPublicKey(InputStream in) throws Exception{    
        try {    
            BufferedReader br= new BufferedReader(new InputStreamReader(in));    
            String readLine= null;    
            StringBuilder sb= new StringBuilder();    
            while((readLine= br.readLine())!=null){    
                if(readLine.charAt(0)=='-'){    
                    continue;    
                }else{    
                    sb.append(readLine);    
                    sb.append('\r');    
                }    
            }    
            loadPublicKey(sb.toString());    
        } catch (IOException e) {    
            throw new Exception("公钥数据流读取错误");    
        } catch (NullPointerException e) {    
            throw new Exception("公钥输入流为空");    
        }    
    }    
    
    /**  
     * 从字符串中加载公钥  
     * @param publicKeyStr 公钥数据字符串  
     * @throws Exception 加载公钥时产生的异常  
     */    
    public void loadPublicKey(String publicKeyStr) throws Exception{    
        try {    
            BASE64Decoder base64Decoder= new BASE64Decoder();    
            byte[] buffer= base64Decoder.decodeBuffer(publicKeyStr);  
            KeyFactory keyFactory= KeyFactory.getInstance("RSA");    
            X509EncodedKeySpec keySpec= new X509EncodedKeySpec(buffer);    
            this.publicKey= (RSAPublicKey) keyFactory.generatePublic(keySpec);    
        } catch (NoSuchAlgorithmException e) {    
            throw new Exception("无此算法");    
        } catch (InvalidKeySpecException e) {    
            throw new Exception("公钥非法");    
        } catch (IOException e) {    
            throw new Exception("公钥数据内容读取错误");    
        } catch (NullPointerException e) {    
            throw new Exception("公钥数据为空");    
        }    
    }    
    
    /**  
     * 从文件中加载私钥  
     * @param keyFileName 私钥文件名  
     * @return 是否成功  
     * @throws Exception   
     */    
    public void loadPrivateKey(InputStream in) throws Exception{    
        try {    
            BufferedReader br= new BufferedReader(new InputStreamReader(in));    
            String readLine= null;    
            StringBuilder sb= new StringBuilder();    
            while((readLine= br.readLine())!=null){    
                if(readLine.charAt(0)=='-'){    
                    continue;    
                }else{    
                    sb.append(readLine);    
                    sb.append('\r');    
                }    
            }    
            loadPrivateKey(sb.toString());    
        } catch (IOException e) {    
            throw new Exception("私钥数据读取错误");    
        } catch (NullPointerException e) {    
            throw new Exception("私钥输入流为空");    
        }    
    }    
    
    public void loadPrivateKey(String privateKeyStr) throws Exception{    
        try {    
            BASE64Decoder base64Decoder= new BASE64Decoder();    
            byte[] buffer= base64Decoder.decodeBuffer(privateKeyStr);    
            PKCS8EncodedKeySpec keySpec= new PKCS8EncodedKeySpec(buffer);    
            KeyFactory keyFactory= KeyFactory.getInstance("RSA");    
            this.privateKey= (RSAPrivateKey) keyFactory.generatePrivate(keySpec);    
        } catch (NoSuchAlgorithmException e) {    
            throw new Exception("无此算法");    
        } catch (InvalidKeySpecException e) {    
            e.printStackTrace();  
            throw new Exception("私钥非法");    
        } catch (IOException e) {    
            throw new Exception("私钥数据内容读取错误");    
        } catch (NullPointerException e) {    
            throw new Exception("私钥数据为空");    
        }    
    }    
    
    /**  
     * 加密过程  
     * @param publicKey 公钥  
     * @param plainTextData 明文数据  
     * @return  
     * @throws Exception 加密过程中的异常信息  
     */    
    public byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception{    
        if(publicKey== null){    
            throw new Exception("加密公钥为空, 请设置");    
        }    
        Cipher cipher= null;    
        try {    
            cipher= Cipher.getInstance("RSA");//, new BouncyCastleProvider());    
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);    
            byte[] output= cipher.doFinal(plainTextData);    
            return output;    
        } catch (NoSuchAlgorithmException e) {    
            throw new Exception("无此加密算法");    
        } catch (NoSuchPaddingException e) {    
            e.printStackTrace();    
            return null;    
        }catch (InvalidKeyException e) {    
            throw new Exception("加密公钥非法,请检查");    
        } catch (IllegalBlockSizeException e) {    
            throw new Exception("明文长度非法");    
        } catch (BadPaddingException e) {    
            throw new Exception("明文数据已损坏");    
        }    
    }    
    
    /**  
     * 解密过程  
     * @param privateKey 私钥  
     * @param cipherData 密文数据  
     * @return 明文  
     * @throws Exception 解密过程中的异常信息  
     */    
    public byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception{    
        if (privateKey== null){    
            throw new Exception("解密私钥为空, 请设置");    
        }    
        Cipher cipher= null;    
        try {    
            cipher= Cipher.getInstance("RSA");//, new BouncyCastleProvider());    
            cipher.init(Cipher.DECRYPT_MODE, privateKey);    
            byte[] output= cipher.doFinal(cipherData);    
            return output;    
        } catch (NoSuchAlgorithmException e) {    
            throw new Exception("无此解密算法");    
        } catch (NoSuchPaddingException e) {    
            e.printStackTrace();    
            return null;    
        }catch (InvalidKeyException e) {    
            throw new Exception("解密私钥非法,请检查");    
        } catch (IllegalBlockSizeException e) {    
            throw new Exception("密文长度非法");    
        } catch (BadPaddingException e) {    
            throw new Exception("密文数据已损坏");    
        }           
    }    
    
      
      
    /**  
     * 字节数据转字符串专用集合  
     */    
    private static final char[] HEX_CHAR= {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};   
      
    /**  
     * 字节数据转十六进制字符串  
     * @param data 输入数据  
     * @return 十六进制内容  
     */    
    public static String byteArrayToString(byte[] data){    
        StringBuilder stringBuilder= new StringBuilder();    
        for (int i=0; i>> 4]);    
            //取出字节的低四位 作为索引得到相应的十六进制标识符    
            stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);    
            if (i


可以在Android端把iOS端加密的字符串复制在Java中注释的地方打开解密测试看看能否成功，鄙人不懂Java所以就没测试了。Java的代码复制来于：http://blog.csdn.net/wlily6/article/details/49125061