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circuit: update base64 doc

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Saleel
2024-05-17 12:43:47 +04:00
parent d667a1c4d6
commit 27ccace98e
1 changed files with 4 additions and 1 deletions
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packages/circuits/lib/base64.circom
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@@ -5,8 +5,11 @@ include "circomlib/circuits/comparators.circom";
/// @title Base64Decode
/// @notice Decodes a Base64 encoded string to array of bytes.
/// @notice Only support inputs with length = `byteLength` (no 0 padding).
/// @notice It is known that padding char '=' can be replaed with `A` to produce the same output
/// as Base64Lookup returns `0` for both, but a pracical attack from this is unlikely.
/// @param byteLength Byte length of the encoded value - length of the output array.
/// @input in Base64 encoded string; assumes input to be valid Base64 character (though constrained implicitly).
/// @input in Base64 encoded string; assumes elements to be valid Base64 characters.
/// @output out Decoded array of bytes.
template Base64Decode(byteLength) {
var charLength = 4 * ((byteLength + 2) \ 3); // 4 chars encode 3 bytes