Base64.m

- (NSString *)base64EncodeString {
    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
    return [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

- (NSString *)base64DecodeString {
    NSData *data = [[NSData alloc] initWithBase64EncodedString:self options:NSDataBase64DecodingIgnoreUnknownCharacters];
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}