IOS 加密实现

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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

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