GH-525: Fix sntrup761x25519-sha512#528
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Because all other KEX algorithms treat the secret resulting from the key agreement as "mpint", our key agreements all returned the "mpint" representation of the result of the key agreement. But sntrup761x25519-sha512 needs the raw 32 bytes of the key agreement (curve25519-sha256). Add a flag to XDH that determines whether it returns the raw bytes or the "mpint" bytes. Bug: apache#525
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Because all other KEX algorithms treat the secret resulting from the key agreement as "mpint", our key agreements all returned the "mpint" representation of the result of the key agreement.
But sntrup761x25519-sha512 needs the raw 32 bytes of the key agreement (curve25519-sha256).
Add a flag to XDH that determines whether it returns the raw bytes or the "mpint" bytes.
Fixes #525.