SHA256 + base64 fingerprint format

Ryuzo Yamamoto ryuzo.yamamoto at
Tue Nov 15 12:42:06 AEDT 2016

Hi Adam and Damien,

Thank you for your quick reply!

I understood that you use unpadded base64 encoding as defined in RFC
4648 section 3.2.

As Adam said, I'll use base64.RawStdEncoding instead of base64.StdEncoding.

Again, Thank you!

On Mon, Nov 14, 2016 at 8:32 PM, Damien Miller <djm at> wrote:
> On Mon, 14 Nov 2016, Ryuzo Yamamoto wrote:
>> Hi,
>> I'm now adding fingerprint format method to golang crypt library.
>> Here is the change set for it:
>> I'd like to make sure why the trailing "=" is removed from the result of
>> base64.
>> Does anybody know?
> I trimmed them because they add no information to the fingerprint - they
> are always present in the plain b64 encoding given the mismatch between
> SHA256's output size and base64's "block" size but they don't represent
> any bits of the hash.
> Also they're ugly :)
> -d

More information about the openssh-unix-dev mailing list