On Wed, Jul 29, 2015 at 08:52:22PM -0400, Richard Hansen wrote:
> I misread the MIME RFC; it requires line breaks every 76 characters, not
> every 75. So I think 76 is a better choice.
>
> My new proposal is to change Section 2.1 item #3 from:
>
> 3) a subjectPublicKeyInfo [RFC5280] in DER format [X.509],
> encoded in Base64 (see Section 4 of [RFC4648].
>
> to:
>
> 3) a subjectPublicKeyInfo [RFC5280] in DER format [X.509],
> encoded in Base64 (see Section 4 of [RFC4648]). To avoid
> long lines, a <CRLF> or <LF> line break MUST be inserted into
> the Base64 encoded string every 76 or fewer characters.
If there are linebreaks, for best interoperability, each line should
contain a multiple of 4 base64 output characters, so that the
decoder can process each line without buffering "left-over" data
from the previous line.
Thus whether the width is 76 (from MIME) or 64 (from PEM), ... it
should be a multiple of 4.
http://tools.ietf.org/html/rfc4648#section-3.1
Of course if no line breaks are inserted, then the issue does not
arise.
--
Viktor.