iOS开发 单AES加密/解密

+(NSData *)AES256ParmEncryptWithKey:(NSString *)key Encrypttext:(NSData *)text  //加密{char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [text length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesEncrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[text bytes], dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer);return nil;}+ (NSData *)AES256ParmDecryptWithKey:(NSString *)key Decrypttext:(NSData *)text  //解密{char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [text length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesDecrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[text bytes], dataLength,buffer, bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer);return nil;}+(NSString *) aes256_encrypt:(NSString *)key Encrypttext:(NSString *)text{const char *cstr = [text cStringUsingEncoding:NSUTF8StringEncoding];NSData *data = [NSData dataWithBytes:cstr length:text.length];//对数据进行加密NSData *result = [LanAES AES256ParmEncryptWithKey:key Encrypttext:data];// 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 *) aes256_decrypt:(NSString *)key Decrypttext:(NSString *)text{// 转换为2进制DataNSMutableData *data = [NSMutableData dataWithCapacity:text.length / 2];unsigned char whole_byte;char byte_chars[3] = {\'\\0\',\'\\0\',\'\\0\'};int i;for (i=0; i < [text length] / 2; i++) {byte_chars[0] = [text characterAtIndex:i*2];byte_chars[1] = [text 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 = [LanAES  AES256ParmDecryptWithKey:key Decrypttext:data];if (result && result.length > 0) {return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];}return nil;}