sodium ext: delete copypasta from sodium_crypto_kdf_derive_from_key()

/via @fredemmott

sodium ext: use crypto_scalarmult_BYTES for points coordinates

Just for consistency.

sodium ext: clear the hash state after we're done hashing

sodium ext: drop unused code
/via @remicollet

sodium ext: implement sodium_crypto_kdf()

Also add zend_parse_parameters_none() statements where appropriate.

sodium ext: add bindings for keygen() functions

This is the recommended way to generate keys correctly for all operations
using a single key, since libsodium 1.0.12.

sodium ext: remove function names before exception messages

sodium ext: update the crypto_kx_*() API to the libsodium one

The crypto_kx API initially present in the PHP bindings was a prototype
that was not part of libsodium.

This implem

sodium ext: update the crypto_kx_*() API to the libsodium one

The crypto_kx API initially present in the PHP bindings was a prototype
that was not part of libsodium.

This implements the one from libsodium >= 1.0.12.

We can later leverage the native libsodium functions if we decide that
1.0.12 is the minimum version we want to support.

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Revert "fix macro redifinitions"

This reverts commit cbbf579f2178073b4d88c0bd2f2052e853a32a1e.

Revert "remove excessive checks and fix warnings"

This reverts commit c620daecb4f8b1552eb3f63f6a699ea315825072.

remove excessive checks and fix warnings

fix macro redifinitions

fix authors

Squashed commit - Add ext/sodium

RFC: https://wiki.php.net/rfc/libsodium
Licensing: https://web.archive.org/web/20170710161517/https://github.com/jedisct1/libsodium-php/issues/127