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iOS常用加密方法（aes、md5、base64）
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1、AES加密
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NSData+AES.h文件
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//
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// NSData-AES.h
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// Smile
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//
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// Created by 周 敏 on 12-11-24.
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// Copyright (c) 2012年 BOX. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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@class NSString;
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@interface NSData (Encryption)
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- (NSData *)AES256EncryptWithKey:(NSString *)key; //加密
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- (NSData *)AES256DecryptWithKey:(NSString *)key; //解密
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@end
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NSData+AES.m文件
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//
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// NSData-AES.h
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// Smile
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//
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// Created by 周 敏 on 12-11-24.
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// Copyright (c) 2012年 BOX. All rights reserved.
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//
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#import "NSData+AES.h"
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#import <CommonCrypto/CommonCryptor.h>
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@implementation NSData (Encryption)
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- (NSData *)AES256EncryptWithKey:(NSString *)key {//加密
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char keyPtr[kCCKeySizeAES256+1];
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bzero(keyPtr, sizeof(keyPtr));
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[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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void *buffer = malloc(bufferSize);
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size_t numBytesEncrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding | kCCOptionECBMode,
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keyPtr, kCCBlockSizeAES128,
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NULL,
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[self bytes], dataLength,
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buffer, bufferSize,
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&numBytesEncrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
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}
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free(buffer);
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return nil;
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}
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- (NSData *)AES256DecryptWithKey:(NSString *)key {//解密
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char keyPtr[kCCKeySizeAES256+1];
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bzero(keyPtr, sizeof(keyPtr));
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[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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void *buffer = malloc(bufferSize);
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size_t numBytesDecrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding | kCCOptionECBMode,
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keyPtr, kCCBlockSizeAES128,
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NULL,
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[self bytes], dataLength,
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buffer, bufferSize,
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&numBytesDecrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
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}
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free(buffer);
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return nil;
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}
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@end
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這裏AES在iOS加過密以後以nsdata的形式存下來，如果想以nsstring形式存儲，那麼對nsdata進行base64位編碼。
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2、BASE64編碼
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首先下載GTMBase64文件，在工程中加入三個文件
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GTMDefines.h
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GTMBase64.h
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GTMBase64.m
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你可以在這裏找到這三個文件
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http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/?r=87
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你也可以在下面的demo裏面找到這3個文件，demo會完整實現文章裏面常用的3種編碼方法。
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我在此稍微封裝一下：
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.h文件
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#pragma mark - base64
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+ (NSString*)encodeBase64String:(NSString *)input;
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+ (NSString*)decodeBase64String:(NSString *)input;
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+ (NSString*)encodeBase64Data:(NSData *)data;
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+ (NSString*)decodeBase64Data:(NSData *)data;
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.m文件
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#pragma mark - base64
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+ (NSString*)encodeBase64String:(NSString * )input {
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NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
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data = [GTMBase64 encodeData:data];
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NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
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return base64String;
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}
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+ (NSString*)decodeBase64String:(NSString * )input {
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NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
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data = [GTMBase64 decodeData:data];
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NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
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return base64String;
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}
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+ (NSString*)encodeBase64Data:(NSData *)data {
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data = [GTMBase64 encodeData:data];
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NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
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return base64String;
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}
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+ (NSString*)decodeBase64Data:(NSData *)data {
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data = [GTMBase64 decodeData:data];
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NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
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return base64String;
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}
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3、MD5加密 www.2cto.com
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NSString+MD5.h文件
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//
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// NSString+MD5Encrypt.h
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// Smile
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//
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// Created by 周 敏 on 12-11-24.
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// Copyright (c) 2012年 BOX. All rights reserved.
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//
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#import <CommonCrypto/CommonDigest.h>
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@interface NSString (MD5)
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- (NSString *)md5Encrypt;
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@end
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NSString+MD5.m文件
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//
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// NSString+MD5Encrypt.h
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// Smile
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//
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// Created by 周 敏 on 12-11-24.
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// Copyright (c) 2012年 BOX. All rights reserved.
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//
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#import "NSString+MD5.h"
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@implementation NSString (MD5)
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- (NSString *)md5Encrypt {
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const char *original_str = [self UTF8String];
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unsigned char result[CC_MD5_DIGEST_LENGTH];
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CC_MD5(original_str, strlen(original_str), result);
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NSMutableString *hash = [NSMutableString string];
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for (int i = 0; i < 16; i++)
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[hash appendFormat:@"%02X", result[i]];
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return [hash lowercaseString];
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}
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@end
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