高级加密标准（英语：Advanced Encryption Standard，缩写：AES），在密码学中又称Rijndael加密法，是美国联邦政府采用的一种区块加密标准。这个标准用来替代原先的DES，已经被多方分析且广为全世界所使用。经过五年的甄选流程，高级加密标准由美国国家标准与技术研究院（NIST）于2001年11月26日发布于FIPS PUB 197，并在2002年5月26日成为有效的标准。2006年，高级加密标准已然成为对称密钥加密中最流行的算法之一。

1.字符串加密(http://www.seacha.com/tools/aes.html)

　　原始字符串：SuperDo.Team
　　加密后字符串：f3de96947b786e45fe338f06e2baeb2a

2.字符串解密（iOS）

　　[1].对NSData进行拓展

　　NSData+AES128.h

@interface NSData (AES128)

• (NSData *)AES128_encrypt:(NSString *)key padding:(NSString *)pad;;

• (NSData *)AES128_decrypt:(NSString *)key padding:(NSString *)pad;;
  @end

  　　NSData+AES128.m

#import "NSData+AES128.h"

@implementation NSData (AES128)

• (NSData *)AES128_encrypt:(NSString *)key padding:(NSString *)pad; //加密
  {
  char keyPtr[kCCKeySizeAES128+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 ,
  keyPtr, kCCBlockSizeAES128,
  [pad UTF8String],
  [self bytes], dataLength,
  buffer, bufferSize,
  &numBytesEncrypted);
  if (cryptStatus == kCCSuccess) {
  return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
  }
  free(buffer);
  return nil;
  }

• (NSData *)AES128_decrypt:(NSString *)key padding:(NSString *)pad; //解密
  {
  char keyPtr[kCCKeySizeAES128+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 ,
  keyPtr, kCCBlockSizeAES128,
  [pad UTF8String],
  [self bytes], dataLength,
  buffer, bufferSize,
  &numBytesDecrypted);
  if (cryptStatus == kCCSuccess) {
  return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];

  }
  free(buffer);
  return nil;
  }

@end

　　[2].对NSString进行拓展

　　NSString+AES128.h

#import
#import

@interface NSString (AES128)

-(NSString *) AES128_decrypt:(NSString *)key padding:(NSString *)pad;
-(NSString *) AES128_encrypt:(NSString *)key padding:(NSString *)pad;;
@end

　　NSString+AES128.m

#import "NSString+AES128.h"
#import "NSData+AES128.h"

@implementation NSString (AES128)
-(NSString *) AES128_encrypt:(NSString *)key padding:(NSString *)pad;
{
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
//对数据进行加密
NSData *result = [data AES128_encrypt:key padding:pad];

//转换为2进制字符串  
if (result && result.length > 0) {

    Byte \*datas = (Byte\*)\[result bytes\];  
    NSMutableString \*output = \[NSMutableString stringWithCapacity:result.length \* 2\];  
    for(int i = 0; i < result.length; i++){  
        \[output appendFormat:@"%02x", datas\[i\]\];  
    }  
    return output;  
}  
return nil;  

}

-(NSString *) AES128_decrypt:(NSString *)key padding:(NSString *)pad;
{
//转换为2进制Data
NSMutableData *data = [NSMutableData dataWithCapacity:self.length / 2];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [self length] / 2; i++) {
byte_chars[0] = [self characterAtIndex:i*2];
byte_chars[1] = [self characterAtIndex:i*2+1];
whole_byte = strtol(byte_chars, NULL, 16);
[data appendBytes:&whole_byte length:1];
}

//对数据进行解密  
NSData\* result = \[data AES128\_decrypt:key padding:pad\];  
if (result && result.length > 0) {  
    return \[\[NSString alloc\] initWithData:result encoding:NSUTF8StringEncoding\];  
}  
return nil;  

}
@end

3.验证

　　main.m

#import
#import "NSString+AES128.h"

int main(int argc, const char * argv[]) {
@autoreleasepool {
// insert code here…
NSLog(@"Hello, World!");
NSString *str = [@"f3de96947b786e45fe338f06e2baeb2a" AES128_decrypt:@"123456" padding:@"8888888877777777"];
NSLog(@"%@",str);
}
return 0;
}

　　验证结果：
　　2016-01-18 19:27:48.703 AES_128_CBC[30636:2351517] Hello, World!
　　2016-01-18 19:27:48.704 AES_128_CBC[30636:2351517] SuperDo.Team
　　Program ended with exit code: 0

　　完美的搞定AES128_CBC模式加密了！

本站文章为宝宝巴士 SD.Team原创，转载务必在明显处注明：（作者官方网站：宝宝巴士) 
转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/5140243.html