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SQRL mostly uses Ed25519 signing keys, but for certain parts of the Identity Lock Protocol, we need to use the Diffie-Hellman key agreement. This requires specially crafted keys. To create a Curve25519 private key, we must tweak a few bits of the key. A Curve key can be created from an Ed key, but the reverse is not necessarily possible.

function CurvePrivateKey( key )
  key[0] &= 248;
  key[31] &= 127;
  key[31] |= 64;
  return key;