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When I decrypt, there will be a decryption exception due to multiple version judgments.but,Remove the version judgment and normal results will be displayed.(Encrypted data & key & iv Encrypted data all identical)Encrypted Data from [NSUserDefaults standardUserDefaults]================================================================Func:Step1:NSData* theData = [[[NSData alloc] initWithBase64EncodedString:userID options:NSDataBase64DecodingIgnoreUnknownCharacters]AES128DecryptWithKey: KEY withIV: IV];Step2:- (NSData *) AES128DecryptWithKey: (NSString *) _sKey withIV: (unsigned int) _iv { char keyPtr[kCCKeySizeAES128 + 1]; bzero(keyPtr, sizeof(keyPtr)); [_sKey getCString: keyPtr maxLength: sizeof(keyPtr) encoding: NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; NSData *nsData; size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); void *iv = malloc(16); memset((void *)iv, _iv, 16); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt( kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES128, iv , [self bytes], dataLength, buffer, bufferSize, &numBytesDecrypted); if (cryptStatus == kCCSuccess) nsData = [NSData dataWithBytes: buffer length: numBytesDecrypted]; free(iv); free(buffer); return nsData;}================================================================Xcode Ver : 11.3Test device : SimPhone 11~13 & Iphone 6(Ver.11)、IphoneXs(Ver.13)