3802518.html

　　(至于RSA的基本原理，大家可以看阮一峰的网络日志的 RSA算法原理（一）和 RSA算法原理（二） )

　　这篇文章只是做一个整理，帮大家理清一下步骤的而已（英文版本请看 RSA Encrypt and Decrypt in IOS and JAVA ）。

　　一、首先，打开终端Terminal，生成必要的公钥、私钥、证书:

openssl genrsa -out private_key.pem 1024                                               //注意1024是长度，可以根据需要变成2048等等

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

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

openssl x509 -outform der -in rsaCert.crt -out public_key.der　　　　　　　　　　　　　　　// Create public_key.der For IOS

openssl pkcs12 -export -out private_key.p12 -inkey private_key.pem -in rsaCert.crt　　// Create private_key.p12 For IOS. 这一步，请记住你输入的密码，IOS代码里会用到

openssl rsa -in private_key.pem -out rsa_public_key.pem -pubout　　　　　　　　　　　　　// Create rsa_public_key.pem For Java

　

openssl pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt　　　　　// Create pkcs8_private_key.pem For Java

上面七个步骤，总共生成7个文件。其中上面各个步骤需要填写的东西可以随便填写，但是密码一定要记住。

public_key.der 和 private_key.p12 这对公钥私钥是给iOS用的，

rsa_public_key.pem和 pkcs8_private_key.pem　是给JAVA用的(本公司给服务端用)。

　　它们的源都来自一个私钥：private_key.pem ， 所以iOS端加密的数据，是可以被JAVA端解密的，反过来也一样。

　　二、IOS 代码:

　　先请你把 public_key.der 和 private_key.p12 拖进你的Xcode项目里去，也请引入 Security.framework 以及 NSData+Base64.h/NSData+Base64.m (Download) 到项目里。

RSAEncryptor.h:　　

#import <Foundation/Foundation.h>

@interface RSAEncryptor : NSObject

#pragma mark - Instance Methods

-(void) loadPublicKeyFromFile: (NSString*) derFilePath;

-(void) loadPublicKeyFromData: (NSData*) derData;

-(void) loadPrivateKeyFromFile: (NSString*) p12FilePath password:(NSString*)p12Password;

-(void) loadPrivateKeyFromData: (NSData*) p12Data password:(NSString*)p12Password;

-(NSString*) rsaEncryptString:(NSString*)string;

-(NSData*) rsaEncryptData:(NSData*)data ;

-(NSString*) rsaDecryptString:(NSString*)string;

-(NSData*) rsaDecryptData:(NSData*)data;

#pragma mark - Class Methods

+(void) setSharedInstance: (RSAEncryptor*)instance;

+(RSAEncryptor*) sharedInstance;

@end

　　RSAEncryptor.m:

#import "RSAEncryptor.h"

#import <Security/Security.h>

#import "NSData+Base64.h"

@implementation RSAEncryptor

{

    SecKeyRef publicKey;

    SecKeyRef privateKey;

}

-(void)dealloc

{

    CFRelease(publicKey);

    CFRelease(privateKey);

}

-(SecKeyRef) getPublicKey {

    return publicKey;

}

-(SecKeyRef) getPrivateKey {

    return privateKey;

}

-(void) loadPublicKeyFromFile: (NSString*) derFilePath

{

    NSData *derData = [[NSData alloc] initWithContentsOfFile:derFilePath];

    [self loadPublicKeyFromData: derData];

}

-(void) loadPublicKeyFromData: (NSData*) derData

{

    publicKey = [self getPublicKeyRefrenceFromeData: derData];

}

-(void) loadPrivateKeyFromFile: (NSString*) p12FilePath password:(NSString*)p12Password

{

    NSData *p12Data = [NSData dataWithContentsOfFile:p12FilePath];

    [self loadPrivateKeyFromData: p12Data password:p12Password];

}

-(void) loadPrivateKeyFromData: (NSData*) p12Data password:(NSString*)p12Password

{

    privateKey = [self getPrivateKeyRefrenceFromData: p12Data password: p12Password];

}

#pragma mark - Private Methods

-(SecKeyRef) getPublicKeyRefrenceFromeData: (NSData*)derData

{

    SecCertificateRef myCertificate = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)derData);

    SecPolicyRef myPolicy = SecPolicyCreateBasicX509();

    SecTrustRef myTrust;

    OSStatus status = SecTrustCreateWithCertificates(myCertificate,myPolicy,&myTrust);

    SecTrustResultType trustResult;

    if (status == noErr) {

        status = SecTrustEvaluate(myTrust, &trustResult);

    }

    SecKeyRef securityKey = SecTrustCopyPublicKey(myTrust);

    CFRelease(myCertificate);

    CFRelease(myPolicy);

    CFRelease(myTrust);

    return securityKey;

}

-(SecKeyRef) getPrivateKeyRefrenceFromData: (NSData*)p12Data password:(NSString*)password

{

    SecKeyRef privateKeyRef = NULL;

    NSMutableDictionary * options = [[NSMutableDictionary alloc] init];

    [options setObject: password forKey:(__bridge id)kSecImportExportPassphrase];

    CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);

    OSStatus securityError = SecPKCS12Import((__bridge CFDataRef) p12Data, (__bridge CFDictionaryRef)options, &items);

    if (securityError == noErr && CFArrayGetCount(items) > 0) {

        CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);

        SecIdentityRef identityApp = (SecIdentityRef)CFDictionaryGetValue(identityDict, kSecImportItemIdentity);

        securityError = SecIdentityCopyPrivateKey(identityApp, &privateKeyRef);

        if (securityError != noErr) {

            privateKeyRef = NULL;

        }

    }

    CFRelease(items);

    return privateKeyRef;

}

#pragma mark - Encrypt

-(NSString*) rsaEncryptString:(NSString*)string {

    NSData* data = [string dataUsingEncoding:NSUTF8StringEncoding];

    NSData* encryptedData = [self rsaEncryptData: data];

    NSString* base64EncryptedString = [encryptedData base64EncodedString];

    return base64EncryptedString;

}

// 加密的大小受限于SecKeyEncrypt函数，SecKeyEncrypt要求明文和密钥的长度一致，如果要加密更长的内容，需要把内容按密钥长度分成多份，然后多次调用SecKeyEncrypt来实现

-(NSData*) rsaEncryptData:(NSData*)data {

    SecKeyRef key = [self getPublicKey];

    size_t cipherBufferSize = SecKeyGetBlockSize(key);

    uint8_t *cipherBuffer = malloc(cipherBufferSize * sizeof(uint8_t));

    size_t blockSize = cipherBufferSize - 11;       // 分段加密

    size_t blockCount = (size_t)ceil([data length] / (double)blockSize);

    NSMutableData *encryptedData = [[NSMutableData alloc] init] ;

    for (int i=0; i<blockCount; i++) {

        int bufferSize = MIN(blockSize,[data length] - i * blockSize);

        NSData *buffer = [data subdataWithRange:NSMakeRange(i * blockSize, bufferSize)];

        OSStatus status = SecKeyEncrypt(key, kSecPaddingPKCS1, (const uint8_t *)[buffer bytes], [buffer length], cipherBuffer, &cipherBufferSize);

        if (status == noErr){

            NSData *encryptedBytes = [[NSData alloc] initWithBytes:(const void *)cipherBuffer length:cipherBufferSize];

            [encryptedData appendData:encryptedBytes];

        }else{

            if (cipherBuffer) {

                free(cipherBuffer);

            }

            return nil;

        }

    }

    if (cipherBuffer){

        free(cipherBuffer);

    }

    return encryptedData;

}

#pragma mark - Decrypt

-(NSString*) rsaDecryptString:(NSString*)string {

    NSData* data = [NSData dataFromBase64String: string];

    NSData* decryptData = [self rsaDecryptData: data];

    NSString* result = [[NSString alloc] initWithData: decryptData encoding:NSUTF8StringEncoding];

    return result;

}

-(NSData*) rsaDecryptData:(NSData*)data {

    SecKeyRef key = [self getPrivateKey];

    size_t cipherLen = [data length];

    void *cipher = malloc(cipherLen);

    [data getBytes:cipher length:cipherLen];

    size_t plainLen = SecKeyGetBlockSize(key) - 12;

    void *plain = malloc(plainLen);

    OSStatus status = SecKeyDecrypt(key, kSecPaddingPKCS1, cipher, cipherLen, plain, &plainLen);

    if (status != noErr) {

        return nil;

    }

    NSData *decryptedData = [[NSData alloc] initWithBytes:(const void *)plain length:plainLen];

    return decryptedData;

}

#pragma mark - Class Methods

static RSAEncryptor* sharedInstance = nil;

+(void) setSharedInstance: (RSAEncryptor*)instance

{

    sharedInstance = instance;

}

+(RSAEncryptor*) sharedInstance

{

    return sharedInstance;

}

　　好了，那么，我们就可以在main.m里做个测试了:

　　main.m:

#import "AppDelegate.h"

#import "RSAEncryptor.h"

int main(int argc, char *argv[])

{

    @autoreleasepool {

        RSAEncryptor* rsaEncryptor = [[RSAEncryptor alloc] init];

        NSString* publicKeyPath = [[NSBundle mainBundle] pathForResource:@"public_key" ofType:@"der"];

        NSString* privateKeyPath = [[NSBundle mainBundle] pathForResource:@"private_key" ofType:@"p12"];

        [rsaEncryptor loadPublicKeyFromFile: publicKeyPath];

        [rsaEncryptor loadPrivateKeyFromFile: privateKeyPath password:@"ISAACS"];    // 这里，请换成你生成p12时的密码

        NSString* restrinBASE64STRING = [rsaEncryptor rsaEncryptString:@"I.O.S"];

        NSLog(@"Encrypted: %@", restrinBASE64STRING);       // 请把这段字符串Copy到JAVA这边main()里做测试

        NSString* decryptString = [rsaEncryptor rsaDecryptString: restrinBASE64STRING];

        NSLog(@"Decrypted: %@", decryptString);

        // System.out.println the encrypt string from Java , and paste it here

        // 这里请换成你的JAVA这边产生的加密的Base64 Encode的字符串

//        NSString* rsaEncrypyBase64 = [NSString stringWithFormat:@"%@\r%@\r%@",

//                                      @"ZNKCVpFYd4Oi2pecLhDXHh+8kWltUMLdBIBDeTvU5kWpTQ8cA1Y+7wKO3d/M8bhULYf1FhWt80Cg",

//                                      @"7e73SV5r+wSlgGWBvTIxqgTWFS4ELGzsEJpVVSlK1oXF0N2mugOURUILjeQrwn1QTcVdXXTMQ0wj",

//                                      @"50GNwnHbAwyLvsY5EUY="];

//

//        NSString* resultString = [rsaEncryptor rsaDecryptString: rsaEncrypyBase64];

//        NSLog(@"Decrypt Java RSA String: %@", resultString);

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

    }

}

#import "AppDelegate.h"

#import "RSAEncryptor.h"

int main(int argc, char *argv[])

{

    @autoreleasepool {

        RSAEncryptor* rsaEncryptor = [[RSAEncryptor alloc] init];

        NSString* publicKeyPath = [[NSBundle mainBundle] pathForResource:@"public_key" ofType:@"der"];

        NSString* privateKeyPath = [[NSBundle mainBundle] pathForResource:@"private_key" ofType:@"p12"];

        [rsaEncryptor loadPublicKeyFromFile: publicKeyPath];

        [rsaEncryptor loadPrivateKeyFromFile: privateKeyPath password:@"ISAACS"];    // 这里，请换成你生成p12时的密码

        NSString* restrinBASE64STRING = [rsaEncryptor rsaEncryptString:@"I.O.S"];

        NSLog(@"Encrypted: %@", restrinBASE64STRING);       // 请把这段字符串Copy到JAVA这边main()里做测试

        NSString* decryptString = [rsaEncryptor rsaDecryptString: restrinBASE64STRING];

        NSLog(@"Decrypted: %@", decryptString);

        // System.out.println the encrypt string from Java , and paste it here

        // 这里请换成你的JAVA这边产生的加密的Base64 Encode的字符串

//        NSString* rsaEncrypyBase64 = [NSString stringWithFormat:@"%@\r%@\r%@",

//                                      @"ZNKCVpFYd4Oi2pecLhDXHh+8kWltUMLdBIBDeTvU5kWpTQ8cA1Y+7wKO3d/M8bhULYf1FhWt80Cg",

//                                      @"7e73SV5r+wSlgGWBvTIxqgTWFS4ELGzsEJpVVSlK1oXF0N2mugOURUILjeQrwn1QTcVdXXTMQ0wj",

//                                      @"50GNwnHbAwyLvsY5EUY="];

//

//        NSString* resultString = [rsaEncryptor rsaDecryptString: rsaEncrypyBase64];

//        NSLog(@"Decrypt Java RSA String: %@", resultString);

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

    }

}

　　代码里注意请把密码修改换成你的p12密码。

　　在main.m的main()函数里有几行注释了的代码，因为那个 ‘rsaEncrypyBase64’ 是我在JAVA端用我的公钥私钥生成的，不适合你的公钥私钥，所以我注释掉。待会做完下面JAVA的，你用你在JAVA端生成的加密字符串替换‘rsaEncrypyBase64’的值，打开注释来测试 JAVA端加密的数据能不能被IOS这端来解密。(答案是能的)

　　三、 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<String> list = new ArrayList<String>();

        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<data.length; i++){

            //取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移

            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0)>>> 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<data.length-1){

                stringBuilder.append(' ');

            }

        }

        return stringBuilder.toString();

    }  

｝

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<String> list = new ArrayList<String>();

        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<data.length; i++){

            //取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移

            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0)>>> 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<data.length-1){

                stringBuilder.append(' ');

            }

        }

        return stringBuilder.toString();

    }  

｝

　　同样的，main()函数里有几行注释了的代码，打开注释，请复制上面IOS端的加密字符串来替换掉，这样，来测试一下来自IOS端的加密数据能不能被JAVA端解密。(答案也是能的)

巴特西

iOS and JAVA 的 RSA 加密解密 (转载整理 )

参考原文地址：http://www.cnblogs.com/makemelike/articles/3802518.html

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