AES加密在iOS上面的实现

Encryption.h文件

#import <Foundation/Foundation.h>

@class NSString;

@interface NSData (Encryption)

- (NSData *)AES256EncryptWithKey:(NSString *)key;   //加密

- (NSData *)AES256DecryptWithKey:(NSString *)key;   //解密

- (NSString *)newStringInBase64FromData;            //追加64编码

+ (NSString*)base64encode:(NSString*)str;           //同上64编码

@end

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Encryption.m文件

#import "Encryption.h"

#import <CommonCrypto/CommonCryptor.h>

static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

@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;

}

- (NSString *)newStringInBase64FromData            //追加64编码

{

    NSMutableString *dest = [[NSMutableString alloc] initWithString:@""];

    unsigned char * working = (unsigned char *)[self bytes];

    int srcLen = [self length];

    for (int i=0; i<srcLen; i += 3) {

        for (int nib=0; nib<4; nib++) {

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