And in fact, Tv has already done that. You want https://github.com/tv42/zbase32.

On Wed, Dec 13, 2017 at 3:01 AM, roger peppe <rogpe...@gmail.com> wrote:
> On 13 December 2017 at 01:23, Ian Lance Taylor <i...@golang.org> wrote:
>> On Tue, Dec 12, 2017 at 3:13 PM, Jeffrey Goldberg <j...@agilebits.com> wrote:
>>>
>>>> On Dec 12, 2017, at 9:00 AM, Ian Lance Taylor <i...@golang.org> wrote:
>>>
>>>> DecodedLen is supposed to be applied to the length of the encoded
>>>> data.  RFC 4648 says that the encoded data must be padded to be a
>>>> multiple of 8 bytes.
>>>
>>> Yet encoding/hash32 defines a NoPadding constant, the code is filled
>>> with tests for whether the padding has been set to NoPadding, and the 
>>> package
>>> docs make reference to setting things with NoPadding.
>>
>> Yes.  But even with the no padding case, it is impossible to have an
>> encoded length of a single byte (I tried to say that in a bit of the
>> message that you didn't quote).  And I hope we can all agree that
>> `DecodedLen` returns the correct value when called with an argument of
>> 2 when `padChar == NoPadding`.  So we are only talking about the value
>> 1, which I assert is impossible in a valid base32 encoded string with
>> no padding.
>
> Looking at http://philzimmermann.com/docs/human-oriented-base-32-encoding.txt,
> it seems that zbase32 allows the encoder and decoder to agree on the
> number of bits transmitted, so if you're encoding 5 bits or less, you
> can use a single encoded character.
>
> ISTM that this difference is probably justification enough to make a
> new zbase32 package rather than using encoding/base32 directly.
>
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