[Pidgin] #16268: irc: received SASL messages must be Base64-decoded

[Pidgin]

#16268: irc: received SASL messages must be Base64-decoded
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 Reporter:  grawity  |      Owner:  elb
     Type:  defect   |     Status:  new
Milestone:           |  Component:  IRC
  Version:  3.0.0hg  |   Keywords:
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 IRC SASL messages are sent and received in Base64 form, but libsasl
 expects them to be decoded first, which the irc plugin doesn't do.

 This breaks all mechanisms that rely on multiple messages (specifically,
 I'm implementing SCRAM-SHA-1 server-side, but GSSAPI or GS2-* would be
 affected too).

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Ticket URL: <https://developer.pidgin.im/ticket/16268>
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