[PATCH] Add Streamlined NTRU Prime sntrup761.

[Simon Josefsson]

Hi

Attached is a second version of the sntrup761 patch, this time using a
minimal API that would work for Kyber too (please confirm).  Unless we
know complexity is required, I prefer to keep things minimal.

I've pushed it to:
https://gitlab.com/jas/libgcrypt/-/commits/jas/sntrup761v2

Below is the added API.  Thoughts?

enum gcry_kem_algos
  {
    GCRY_KEM_SNTRUP761 = 761,
  };

#define GCRY_KEM_SNTRUP761_SECRETKEY_SIZE 1763
#define GCRY_KEM_SNTRUP761_PUBLICKEY_SIZE 1158
#define GCRY_KEM_SNTRUP761_CIPHERTEXT_SIZE 1039
#define GCRY_KEM_SNTRUP761_SHAREDSECRET_SIZE 32

gcry_error_t gcry_kem_keypair (int algo,
			       void *pubkey,
			       void *seckey);

gcry_error_t gcry_kem_enc (int algo,
			   const void *pubkey,
			   void *ciphertext,
			   void *ss);

gcry_error_t gcry_kem_dec (int algo,
			   const void *ciphertext,
			   const void *seckey,
			   void *ss);

/Simon
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