psk v2 #1273
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psk v2 #1273
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−33
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This implements PSK at stage 0 for noise IX. The primary benefit is that initiating handshakes have their contents masked, which contains the certificate of the initiator.
This is slightly different from the old implementation in #441. Mainly we aren't mixing in the recipient address because in v2 hosts can have multiple addresses which explodes the possible keys to test at stage 1.
Co-author: @wadey
Co-author: @rawdigits