IOS 加密实现
随着移动开发的火热，安全随之也越来越重要，各种加密md5，AES，sha1，RSA，加密方法，还有https 加密协议等，此文记录下平时用到的加密方法用来记录
- sha1 加密；
- md5；
- base64
- AES
- RSA
目前自己学习用到的就这6中，以后用到的还会补充，
sha1，md5，base64 写在一起，里面用到的GTMBase64 自己可以下载
- (NSString*) sha1
{
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
uint8_t digest[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(data.bytes, (unsigned int)data.length, digest);
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", digest[i]];
return output;
}
-(NSString *) md5
{
const char *cStr = [self UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr, (unsigned int)strlen(cStr), digest );
NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", digest[i]];
return output;
}
- (NSString *) sha1_base64
{
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
uint8_t digest[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(data.bytes, (unsigned int)data.length, digest);
NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
base64 = [GTMBase64 encodeData:base64];
NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
return output;
}
- (NSString *) md5_base64
{
const char *cStr = [self UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr, (unsigned int)strlen(cStr), digest );
NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];
base64 = [GTMBase64 encodeData:base64];
NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
return output;
}
- (NSString *) base64
{
NSData * data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
data = [GTMBase64 encodeData:data];
NSString * output = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return output;
}
- (NSString*) dBase64 {
NSData*data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
data = [GTMBase64 decodeData:data];
NSString*base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] ;
return base64String;
}
AES 加解密的使用
#import "NSData+AES.h"
#import <CommonCrypto/CommonCryptor.h>
@implementation NSData (Encryption)
- (NSData *)AES256EncryptWithKey:(NSString *)key {//加密
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
- (NSData *)AES256DecryptWithKey:(NSString *)key {//解密
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
}
free(buffer);
return nil;
}
@end以上也是需要base64文件的，在使用的地方直接这样调用
#pragma mark - AES加密
//将string转成带密码的data
+(NSData*)encryptAESData:(NSString*)string {
//将nsstring转化为nsdata
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
//使用密码对nsdata进行加密
NSData *encryptedData = [data AES256EncryptWithKey:APP_PUBLIC_PASSWORD];
return encryptedData;
}
//将带密码的data转成string
+(NSString*)decryptAESData:(NSData*)data { //使用密码对data进行解密 NSData *decryData = [data AES256DecryptWithKey:APP_PUBLIC_PASSWORD]; //将解了密码的nsdata转化为nsstring NSString *string = [[NSString alloc] initWithData:decryData encoding:NSUTF8StringEncoding]; return [string autorelease]; }
上面的APP_PUBLIC_PASSWORD，是自己设计的key ，可以随便设置，如果加密后的data 想专为string 转码过去
[data base64Encoding];RAS加密实现，后台当时用的是java实现的，RAS 加密算是笔记强的加密，非对称加密 ，现在使用的也比较多，因为时间比较久，只能把当时的代码贴出来，
参考了高手文章
http://blog.yorkgu.me/2011/10/27/rsa-in-ios-using-publick-key-generated-by-openssl/
http://blog.csdn.net/chaijunkun/article/details/7275632
代码
#import <Foundation/Foundation.h>
@interface RSA1 : NSObject
+ (SecKeyRef) getPublicKey;
+ (NSData*) rsaEncryptString:(NSString*) string;
@end
//
// RSA.m
// TPL-AUTO-CLAIM-iPad
//
// Created by shen pu on 13-1-11.
// Copyright (c) 2013年 cisetech. All rights reserved.
//
#import "RSA1.h"
#import "NSData+Base64.h"
@implementation RSA1
//#define RSA_KEY_BASE64 @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbMr8bg5pqgpF2i6HbiFos4IJaaj+3WCEALnPGg1cgyeDh+mPagK96o0kLKu1zqtfhWQQ9bMB/BvVGfzW87bBfuiFxxTYEMmhs7UqBvx6tiwgrL7JPJgZWtZnGefqyOsXJaXBf8nBPLb5dJ+denkgRr/zbAsNXig6E9jf/ULcWQwIDAQAB"
static SecKeyRef _public_key=nil;
+ (SecKeyRef) getPublicKey{ // 从公钥证书文件中获取到公钥的SecKeyRef指针
if(_public_key == nil){
NSString *publicKeyPath = [[NSBundle mainBundle] pathForResource:@"public_key" ofType:@"der"];
NSData *certificateData = [[NSData alloc]initWithContentsOfFile:publicKeyPath];
// NSString *RSA_KEY_BASE64=[Base64 stringByEncodingData:data];
// NSData *certificateData = [Base64 decodeString:RSA_KEY_BASE64];
SecCertificateRef myCertificate = SecCertificateCreateWithData(kCFAllocatorDefault, (CFDataRef)certificateData);
SecPolicyRef myPolicy = SecPolicyCreateBasicX509();
SecTrustRef myTrust;
OSStatus status = SecTrustCreateWithCertificates(myCertificate,myPolicy,&myTrust);
SecTrustResultType trustResult;
if (status == noErr) {
status = SecTrustEvaluate(myTrust, &trustResult);
}
_public_key = SecTrustCopyPublicKey(myTrust);
CFRelease(myCertificate);
CFRelease(myPolicy);
CFRelease(myTrust);
}
return _public_key;
}
+ (NSData*) rsaEncryptString:(NSString*) string{
SecKeyRef key = [self getPublicKey];
size_t cipherBufferSize = SecKeyGetBlockSize(key);
uint8_t *cipherBuffer = malloc(cipherBufferSize * sizeof(uint8_t));
NSData *stringBytes = [string dataUsingEncoding:NSUTF8StringEncoding];
size_t blockSize = cipherBufferSize - 11;
size_t blockCount = (size_t)ceil([stringBytes length] / (double)blockSize);
NSMutableData *encryptedData = [[[NSMutableData alloc] init] autorelease];
for (int i=0; i<blockCount; i++) {
int bufferSize = MIN(blockSize,[stringBytes length] - i * blockSize);
NSData *buffer = [stringBytes 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];
[encryptedBytes release];
}else{
if (cipherBuffer) free(cipherBuffer);
return nil;
}
}
if (cipherBuffer){free(cipherBuffer);}
NSLog(@"Encrypted text (%d bytes): %@", [encryptedData length], [encryptedData description]);
// NSLog(@"Encrypted text base64: %@", [NSData base64EncodedString:encryptedData]);
return encryptedData;
}
@end里面的生成的 public_key.der ，private_key 是从终端生成了
命令：openssl req -x509 -out public_key.der -outform der -new -newkey rsa:1024 -keyout private_key.pem
生成两个对应的秘钥，public_key.der放在客户端，private_key 放在服务端，然后跟服务端交互，发现服务器端私钥解密不出来，不知道为啥，然后网上找文章，发现说生成的私钥是-x509编码的什么，需要转码，然后把私钥转换了一下，看http://blog.csdn.net/chaijunkun/article/details/7275632高手说要转换为pkcs8，后给服务端才能解密，所以把pirvate_key转换了一下：命令：openssl pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt，然后把生成的pkcs8_private_key给服务端，然后我客户端发送的就能解密了，还有在用的时候，也不知道为什么要把加密的数据data要base64转码，还得用Ndatabase64文件，下面是代码：
//
// NSData+Base64.h
//
// Version 1.0.2
//
// Created by Nick Lockwood on 12/01/2012.
// Copyright (C) 2012 Charcoal Design
//
// Distributed under the permissive zlib License
// Get the latest version from here:
//
// https://github.com/nicklockwood/Base64
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
#import <Foundation/Foundation.h>
@interface NSData (Base64)
+ (NSData *)dataWithBase64EncodedString:(NSString *)string;
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth;
- (NSString *)base64EncodedString;
@end
//
// NSData+Base64.m
//
// Version 1.0.2
//
// Created by Nick Lockwood on 12/01/2012.
// Copyright (C) 2012 Charcoal Design
//
// Distributed under the permissive zlib License
// Get the latest version from here:
//
// https://github.com/nicklockwood/Base64
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
#import "NSData+Base64.h"
@implementation NSData (Base64)
- (NSData*)formatWithData:(NSData*)data{
if (data && [data length]>76) {
}return data;
}
+ (NSData *)dataWithBase64EncodedString:(NSString *)string
{
const char lookup[] =
{
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62, 99, 99, 99, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 99, 99, 99, 99, 99, 99,
99, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 99, 99, 99, 99, 99,
99, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 99, 99, 99, 99, 99
};
NSData *inputData = [string dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
long long inputLength = [inputData length];
const unsigned char *inputBytes = [inputData bytes];
long long maxOutputLength = (inputLength / 4 + 1) * 3;
NSMutableData *outputData = [NSMutableData dataWithLength:maxOutputLength];
unsigned char *outputBytes = (unsigned char *)[outputData mutableBytes];
int accumulator = 0;
long long outputLength = 0;
unsigned char accumulated[] = {0, 0, 0, 0};
for (long long i = 0; i < inputLength; i++)
{
unsigned char decoded = lookup[inputBytes[i] & 0x7F];
if (decoded != 99)
{
accumulated[accumulator] = decoded;
if (accumulator == 3)
{
outputBytes[outputLength++] = (accumulated[0] << 2) | (accumulated[1] >> 4);
outputBytes[outputLength++] = (accumulated[1] << 4) | (accumulated[2] >> 2);
outputBytes[outputLength++] = (accumulated[2] << 6) | accumulated[3];
}
accumulator = (accumulator + 1) % 4;
}
}
//handle left-over data
if (accumulator > 0) outputBytes[outputLength] = (accumulated[0] << 2) | (accumulated[1] >> 4);
if (accumulator > 1) outputBytes[++outputLength] = (accumulated[1] << 4) | (accumulated[2] >> 2);
if (accumulator > 2) outputLength++;
//truncate data to match actual output length
outputData.length = outputLength;
return outputLength? outputData: nil;
}
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
{
//ensure wrapWidth is a multiple of 4
wrapWidth = (wrapWidth / 4) * 4;
const char lookup[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
long long inputLength = [self length];
const unsigned char *inputBytes = [self bytes];
long long maxOutputLength = (inputLength / 3 + 1) * 4;
maxOutputLength += wrapWidth? (maxOutputLength / wrapWidth) * 2: 0;
unsigned char *outputBytes = (unsigned char *)malloc(maxOutputLength);
long long i;
long long outputLength = 0;
for (i = 0; i < inputLength - 2; i += 3)
{
outputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];
outputBytes[outputLength++] = lookup[((inputBytes[i] & 0x03) << 4) | ((inputBytes[i + 1] & 0xF0) >> 4)];
outputBytes[outputLength++] = lookup[((inputBytes[i + 1] & 0x0F) << 2) | ((inputBytes[i + 2] & 0xC0) >> 6)];
outputBytes[outputLength++] = lookup[inputBytes[i + 2] & 0x3F];
//add line break
if (wrapWidth && (outputLength + 2) % (wrapWidth + 2) == 0)
{
outputBytes[outputLength++] = '\r';
outputBytes[outputLength++] = '\n';
}
}
//handle left-over data
if (i == inputLength - 2)
{
// = terminator
outputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];
outputBytes[outputLength++] = lookup[((inputBytes[i] & 0x03) << 4) | ((inputBytes[i + 1] & 0xF0) >> 4)];
outputBytes[outputLength++] = lookup[(inputBytes[i + 1] & 0x0F) << 2];
outputBytes[outputLength++] = '=';
}
else if (i == inputLength - 1)
{
// == terminator
outputBytes[outputLength++] = lookup[(inputBytes[i] & 0xFC) >> 2];
outputBytes[outputLength++] = lookup[(inputBytes[i] & 0x03) << 4];
outputBytes[outputLength++] = '=';
outputBytes[outputLength++] = '=';
}
//truncate data to match actual output length
outputBytes = realloc(outputBytes, outputLength);
NSString *result = [[NSString alloc] initWithBytesNoCopy:outputBytes length:outputLength encoding:NSASCIIStringEncoding freeWhenDone:YES];
#if !__has_feature(objc_arc)
[result autorelease];
#endif
return (outputLength >= 4)? result: nil;
}
- (NSString *)base64EncodedString
{
return [self base64EncodedStringWithWrapWidth:0];
}
@end因为当时的base64文件和上面的加密的文件的base64 不一样，所以这里贴出来代码，使用的时候
NSData *data1=[RSA1 rsaEncryptString:@"TEST"];
[data1 base64EncodedString];
NSLog(@"data1===========%@", [data1 base64EncodedString]);这样的话发送给服务端的字符串后才能解密，当时用的base64 类不一样，还是不能用，最后还是找到网上的NSDAata+base64这个类里面的方法才能解密，最后这样尝试就成功了，这个RSA 比较麻烦的就是证书的问题和key 的问题，一旦这个搞清楚了，就简单多了，
以上就是自己平时使用的加密方法，谢谢
上面用到的GMTbase64 文件类
http://download.csdn.net/download/songbai1211/9344631