Nikos Dragazis 57bc51342e utils: Introduce base64url_{encode,decode} ...

Add helpers for base64url encoding.

base64url is a variant of base64 that uses a URL-safe alphabet. It can
be constructed from base64 by replacing the '+' and '/' characters with
'-' and '_' respectively. Many implementations also strip the padding,
although this is not required by the spec [1].

This will be used in upcoming patches for Azure Key Vault requests that
require base64url-encoded payloads.

[1] https://datatracker.ietf.org/doc/html/rfc4648#section-5

Signed-off-by: Nikos Dragazis <nikolaos.dragazis@scylladb.com>

2025-07-16 17:14:08 +03:00

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