IOS实现AES加密 128 CBC no padding模式

参考链接：https://blog.csdn.net/j_akill/article/details/44079597

AESEncrypt.h:

//AESEncrypt.h
@interface AESEncrypt : NSObject

+ (NSString*) AES128Encrypt:(NSString *)plainText;

+ (NSString*) AES128Decrypt:(NSString *)encryptText;

+ (BOOL)validKey:(NSString*)key;

@end

 AESEncrypt.m:

//AESEncrypt.m
#import "AESEncrypt.h"
#import 
#import "GTMBase64.h"

#define gkey @"1234567812345678" //自行修改
#define gIv @"1234567812345678" //自行修改

@implementation AESEncrypt

+(NSString *)AES128Encrypt:(NSString *)plainText
{
    if( ![self validKey:gkey] ){
        return nil;
    }
    
    char keyPtr[kCCKeySizeAES128 + 1];
    memset(keyPtr, 0, sizeof(keyPtr));
    [gkey getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    
    char ivPtr[kCCBlockSizeAES128 + 1];
    memset(ivPtr, 0, sizeof(ivPtr));
    [gIv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
    
    NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [data length];
    
    int diff = kCCBlockSizeAES128 - (dataLength % kCCBlockSizeAES128);
    unsigned long newSize = 0;
    
    if(diff > 0)
    {
        newSize = dataLength + diff;
    }
    
    char dataPtr[newSize];
    memcpy(dataPtr, [data bytes], [data length]);
    for(int i = 0; i < diff; i++)
    {
        dataPtr[i + dataLength] = 0x00;
    }
    
    size_t bufferSize = newSize + kCCBlockSizeAES128;
    //size_t bufferSize = 1024;
    void *buffer = malloc(bufferSize);
    memset(buffer, 0, bufferSize);
    
    size_t numBytesCrypted = 0;
    
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                          kCCAlgorithmAES128,
                                          0x00,
                                          [gkey UTF8String],
                                          kCCKeySizeAES128,
                                          [gIv UTF8String],
                                          dataPtr,
                                          sizeof(dataPtr),
                                          buffer,
                                          bufferSize,
                                          &numBytesCrypted);
    
    if (cryptStatus == kCCSuccess) {
        NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted];
        return [GTMBase64 stringByEncodingData:resultData];
    }
    free(buffer);
    return nil;
}

+(BOOL)validKey:(NSString*)key
{
    if( key==nil || key.length !=16 ){
        return NO;
    }
    return YES;
}

+(NSString *)AES128Decrypt:(NSString *)encryptText
{
    char keyPtr[kCCKeySizeAES128 + 1];
    memset(keyPtr, 0, sizeof(keyPtr));
    [gkey getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    
    char ivPtr[kCCBlockSizeAES128 + 1];
    memset(ivPtr, 0, sizeof(ivPtr));
    [gIv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
    
    NSData *data = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]];
    NSUInteger dataLength = [data length];
    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);
    
    size_t numBytesCrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          kCCAlgorithmAES128,
                                          0x0000,
                                          keyPtr,
                                          kCCBlockSizeAES128,
                                          ivPtr,
                                          [data bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize,
                                          &numBytesCrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted];
        return [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
    }
    free(buffer);
    return nil;
}

@end

其它平台实现参考链接：http://ios.pianshen.com/article/62522784079/

其它参考链接：http://www.cnblogs.com/leotangcn/p/4248414.html