index the alphabet for decoding only when needed ( " Invalid length for a base32 string with padding.") Input = Regex.Replace(input, " \\s+", " ") Result.Append( ((result.Length % 8) = 0 ?Ġ : ( 8 - (result.Length % 8)), PaddingChar)) take input five bytes at a time to chunk it up for encoding for ( int i = 0 i 3 bitOffset -= 5) / public Base32Url() : this( false, false, false, Base32StandardAlphabet) / White space is not permitted when decoding (not ignored). / using the standard base32 alphabet without padding. / /// Create case insensitive encoder/decoder alphabets may be used with varying case sensitivity, // thus index must not ignore case private static Dictionary> _indexes = new Dictionary>( 2, StringComparer.InvariantCulture) Public bool IgnoreWhiteSpaceWhenDecoding Public const string Base32StandardAlphabet = Public const char StandardPaddingChar = ' =' / get a z-base-32 compatible encoder/decoder. / /// If you leave padding off and use Base32Url.ZBase32Alphabet you
/ encoder/decoder giving you 8 character chunks right padded with equals symbols. / /// If you turn padding and case sensitivity on it becomes a standard base32 / off and it is not case sensitive (by default). / /// Base32Url is a standard base 32 encoder/decoder except that padding turned The result you get from HttpServerUtility.UrlTokenEncode is essentially base64url, but instead of truncating the padding, they append a digit (of 0, 1 or 2) indicating the number of padding characters removed. The base64 implementation I have here is a little hackish, but a far better option than the one you get from Microsoft.
#Base32 decode code
There are other implementations of base32 encoding out there but I feel the code of this base32 implementation is much simpler (far less code involved in the bit shifting calculations). This is not the same as Microsoft’s HttpServerUtility.UrlTokenEncode.Uses the URL-Safe alternative Base64 alphabet from RFC 4648.Supports the Base32 extension / alternate alphabet z-base-32.Supports standard Base32 with padding characters (=) per Base32 from RFC 4648.This uses the standard Base32 alphabet encoding but omits padding characters and is case insensitive. The default mode for the Base32 encoder/decoder is Base32Url.Code Maintained on GitHub and Published at NuGet The only non alpha-numeric characters Base64Url contains are the hyphen ( -) and underscore ( _) characters, neither of these need further encoding for use in URLs or file-names. The following is an example that avoids vowels, the letter L and has no numeric characters: BCDFGHKMNPQRSTVWXYZbcdfghkmnpqrs.īase64Url is more compact than Base32Url and it is almost always usable as a URL token or file-name. A custom case sensitive alphabet with only consonant (non vowel) characters can be used to ensure your tokens do not contain accidental profanities. Base32Url also supports custom alphabets. No hyphens, underscores, pluses, slashes or equals are used, making it usable as a URL token in almost all circumstances. This is useful when you need to transfer binary data through technologies that only support text (such as including binary security tokens in URLs).īase32Url encodes with only the characters A to Z and 2 to 7.
These are designed to encode binary data to plain text, and decode the resulting text back to the original binary. Standards based implementations of various Base32 and Base64 encoding/decoding methods. Moved to and maintained on github ( ), published on nuget ( ).
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