[curves] Security of using the same private key for X25519 and Ed25519/EdDSA

[Tony Arcieri]

I saw this comment recently:

https://github.com/jedisct1/libsodium/issues/77#issuecomment-90225711

I believe this is secure, but lost any links to references about its
security.

Can anyone opine here?

-- 
Tony Arcieri
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