decodedLenForSlice

Returns the decoded length of a hexadecimal string, ignoring any characters in the ignore list. This operation does not run in constant time, but it aims to avoid leaking information about the underlying hexadecimal string.

Function parameters

Parameters

decoder:DecoderWithIgnore
encoded:[]const u8

(best-effort) constant time hexadecimal encoding and decoding.

Types

hex: (best-effort) constant time hexadecimal encoding and decoding.
base64: (best-effort) constant time base64 encoding and decoding.

Error sets in this namespace

Error Sets

Error

Source

Implementation

pub fn decodedLenForSlice(decoder: DecoderWithIgnore, encoded: []const u8) !usize {
    var hex_len = encoded.len;
    for (encoded) |c| {
        if (decoder.ignored_chars.isSet(c)) hex_len -= 1;
    }
    if (hex_len % 2 != 0) {
        return error.InvalidPadding;
    }
    return hex_len / 2;
}