Is it possible to base64-encode a file in chunks?

It’s not possible bit-by-bit but 3 bytes at a time, or multiples of 3 bytes at time will do!. In other words if you split your input file in “chunks” which size(s) is (are) multiples of 3 bytes, you can encode the chunks separately and piece together the resulting B64-encoded pieces together (in the corresponding … Read more

Remove trailing “=” when base64 encoding

The = is padding. <!————> Wikipedia says An additional pad character is allocated which may be used to force the encoded output into an integer multiple of 4 characters (or equivalently when the unencoded binary text is not a multiple of 3 bytes) ; these padding characters must then be discarded when decoding but still … Read more

Is there a Base64Stream for .NET?

If you want a stream that converts to Base64, you can put a ToBase64Transform into a CryptoStream: new CryptoStream(stream, new ToBase64Transform(), CryptoStreamMode.Write) If you just want to convert a single byte array to Base64, you can simply call Convert.ToBase64String(bytes). In both cases, you can replace the word To with From.

How to check whether a string is Base64 encoded or not

You can use the following regular expression to check if a string constitutes a valid base64 encoding: ^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$ In base64 encoding, the character set is [A-Z, a-z, 0-9, and + /]. If the rest length is less than 4, the string is padded with ‘=’ characters. ^([A-Za-z0-9+/]{4})* means the string starts with 0 or more … Read more

Cracking base64 encryption [closed]

Base64 isn’t an encryption. It’s a coding. There is no key in Base64. There are lots of ways to get base64 decoded (a random search shows this as one of them). Your problem seems to be that the data, in addition to being coded, is also encrypted. Unless you know what it is encrypted with, … Read more