7/26/2023 0 Comments Base 64 decode jwt pythonThe padding might be of some use for streaming and arbitrary length bit sequences as long as they're a multiple of two. In this case, you're best off removing it. A base64 encoder can simply ignore left over bits that total less than 8 bits. The padding isn't really needed when you're encoding bytes. The padding is there tell the decoder about your padding. The padding says to ignore those extra four (=) or two (=) bits. For multiples of six against multiple of 8 you can have a remainder of either 0, 2 or 4 bits. If your string is 2 bytes, you have to output 18 bits, with two bits extra. If your string is 1 byte (8 bits), you'll have an output of 12 bits as the smallest multiple of 6 that 8 will fit into, with 4 bits extra. This is the case for most people.īase64 consumes 6 bits at a time and produces a byte of 8 bits that only uses six bits worth of combinations. If you're encoding bytes (at fixed bit length), then the padding is redundant. ![]() ![]() So if your destination is PHP, you can safely strip the padding and decode without fancy calculations. Note that in PHP base64_decode will accept strings without padding, hence if you remove it to process it later in PHP it's not necessary to add it back. Note that the data will not be valid Base64 in transport.Īlso, Another user pointed out (relevant to PHP users): If you control the other end, you could remove it when in transport, then re-insert it (by checking the string length) before decoding.
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