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