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Chris Tate
140b1f397f
computeSecret now fails with ERR_CRYPTO_OPERATION_FAILED ("Failed to
compute shared secret") when the exponentiation yields 0, 1 or p - 1,
as Node's OpenSSL derivation does: such a secret is predictable, from a
peer key of small order or a composite modulus. 6708 covers a secret of
1 and of p - 1 (peer keys of order 3 and 6 modulo a 512-bit prime with
p ≡ 1 mod 6) and of 0 (a peer key sharing the factor of a square
modulus).