如何将 base64 字符串的 NSString 转换为 NSSData

Question

My current code is like below which is from UTF8 to data. But the string is base64 (read from a file to be encrypted in aes256 cbc) and not able to be converted into UTF8

NSString* str = @"somelongbase64stringreadfromsmallimagefile";

NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];

NSMutableData * buffer = [[NSMutableData alloc] initWithLength:[data length] + kCCBlockSizeAES128];

Answer 1

got it working by

NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:0];