1 files changed, 53 insertions, 0 deletions
diff --git a/crypto/ntru.h b/crypto/ntru.h
new file mode 100644
index 00000000..4789491b
--- /dev/null
+++ b/crypto/ntru.h
@@ -0,0 +1,53 @@
+/*
+ * Internal functions for the NTRU cryptosystem, exposed in a header
+ * that is expected to be included only by ntru.c and test programs.
+ */
+
+#ifndef PUTTY_CRYPTO_NTRU_H
+#define PUTTY_CRYPTO_NTRU_H
+
+unsigned ntru_ring_invert(uint16_t *out, const uint16_t *in,
+                          unsigned p, unsigned q);
+void ntru_ring_multiply(uint16_t *out, const uint16_t *a, const uint16_t *b,
+                        unsigned p, unsigned q);
+void ntru_mod3(uint16_t *out, const uint16_t *in, unsigned p, unsigned q);
+void ntru_round3(uint16_t *out, const uint16_t *in, unsigned p, unsigned q);
+void ntru_bias(uint16_t *out, const uint16_t *in, unsigned bias,
+               unsigned p, unsigned q);
+void ntru_scale(uint16_t *out, const uint16_t *in, uint16_t scale,
+                unsigned p, unsigned q);
+
+NTRUEncodeSchedule *ntru_encode_schedule(const uint16_t *ms_in, size_t n);
+void ntru_encode_schedule_free(NTRUEncodeSchedule *sched);
+size_t ntru_encode_schedule_length(NTRUEncodeSchedule *sched);
+size_t ntru_encode_schedule_nvals(NTRUEncodeSchedule *sched);
+void ntru_encode(NTRUEncodeSchedule *sched, const uint16_t *rs_in,
+                 BinarySink *bs);
+void ntru_decode(NTRUEncodeSchedule *sched, uint16_t *rs_out, ptrlen data);
+
+void ntru_gen_short(uint16_t *v, unsigned p, unsigned w);
+
+NTRUKeyPair *ntru_keygen_attempt(unsigned p, unsigned q, unsigned w);
+NTRUKeyPair *ntru_keygen(unsigned p, unsigned q, unsigned w);
+void ntru_keypair_free(NTRUKeyPair *keypair);
+
+void ntru_encrypt(uint16_t *ciphertext, const uint16_t *plaintext,
+                  uint16_t *pubkey, unsigned p, unsigned q);
+void ntru_decrypt(uint16_t *plaintext, const uint16_t *ciphertext,
+                  NTRUKeyPair *keypair);
+
+void ntru_encode_pubkey(const uint16_t *pubkey, unsigned p, unsigned q,
+                        BinarySink *bs);
+ptrlen ntru_decode_pubkey(uint16_t *pubkey, unsigned p, unsigned q,
+                          BinarySource *src);
+void ntru_encode_ciphertext(const uint16_t *ciphertext, unsigned p, unsigned q,
+                            BinarySink *bs);
+ptrlen ntru_decode_ciphertext(uint16_t *ct, NTRUKeyPair *keypair,
+                              BinarySource *src);
+void ntru_encode_plaintext(const uint16_t *plaintext, unsigned p,
+                           BinarySink *bs);
+
+unsigned ntru_keypair_p(NTRUKeyPair *keypair);
+const uint16_t *ntru_pubkey(NTRUKeyPair *keypair);
+
+#endif /* PUTTY_CRYPTO_NTRU_H */