1 files changed, 123 insertions, 0 deletions
diff --git a/lib/nettle/ecc.h b/lib/nettle/ecc.h
new file mode 100644
index 0000000000..0ba3b0b08c
--- /dev/null
+++ b/lib/nettle/ecc.h
@@ -0,0 +1,123 @@
+#include <gmp.h>
+#include <nettle/nettle-types.h>
+#include <nettle/dsa.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+#define LTC_MECC
+#define ECC256
+
+#define PK_PRIVATE 1
+#define PK_PUBLIC 2
+
+/* ---- ECC Routines ---- */
+/* size of our temp buffers for exported keys */
+#define ECC_BUF_SIZE 512
+
+/* max private key size */
+#define ECC_MAXSIZE  66
+
+/** Structure defines a NIST GF(p) curve */
+typedef struct {
+   /** The size of the curve in octets */
+   int size;
+
+   /** name of curve */
+   const char *name; 
+
+   /** The prime that defines the field the curve is in (encoded in hex) */
+   const char *prime;
+
+   /** The fields B param (hex) */
+   const char *B;
+
+   /** The order of the curve (hex) */
+   const char *order;
+  
+   /** The x co-ordinate of the base point on the curve (hex) */
+   const char *Gx;
+ 
+   /** The y co-ordinate of the base point on the curve (hex) */
+   const char *Gy;
+} ltc_ecc_set_type;
+
+/** A point on a ECC curve, stored in Jacbobian format such that (x,y,z) => (x/z^2, y/z^3, 1) when interpretted as affine */
+typedef struct {
+    /** The x co-ordinate */
+    mpz_t x;
+
+    /** The y co-ordinate */
+    mpz_t y;
+
+    /** The z co-ordinate */
+    mpz_t z;
+} ecc_point;
+
+/** An ECC key */
+typedef struct {
+    /** Type of key, PK_PRIVATE or PK_PUBLIC */
+    int type;
+
+    mpz_t prime;
+    mpz_t order;
+    mpz_t Gx;
+    mpz_t Gy;
+
+    /** The public key */
+    ecc_point pubkey;
+
+    /** The private key */
+    mpz_t k;
+} ecc_key;
+
+/** the ECC params provided */
+extern const ltc_ecc_set_type ltc_ecc_sets[];
+
+int  ecc_test(void);
+void ecc_sizes(int *low, int *high);
+int  ecc_get_size(ecc_key *key);
+
+int ecc_make_key(void *random_ctx, nettle_random_func random, ecc_key *key, const ltc_ecc_set_type *dp);
+int ecc_make_key_ex(void *random_ctx, nettle_random_func random, ecc_key *key, mpz_t prime, mpz_t order, mpz_t Gx, mpz_t Gy);
+void ecc_free(ecc_key *key);
+
+int  ecc_shared_secret(ecc_key *private_key, ecc_key *public_key, 
+                       unsigned char *out, unsigned long *outlen);
+
+int ecc_sign_hash(const unsigned char *in,  unsigned long inlen, 
+                        struct dsa_signature *signature,
+                        void *random_ctx, nettle_random_func random, ecc_key *key);
+
+int  ecc_verify_hash(struct dsa_signature * signature,
+                     const unsigned char *hash, unsigned long hashlen, 
+                     int *stat, ecc_key *key);
+
+/* low level functions */
+ecc_point *ltc_ecc_new_point(void);
+void       ltc_ecc_del_point(ecc_point *p);
+int        ltc_ecc_is_valid_idx(int n);
+
+/* point ops (mp == montgomery digit) */
+/* R = 2P */
+int ltc_ecc_projective_dbl_point(ecc_point *P, ecc_point *R, mpz_t modulus);
+
+/* R = P + Q */
+int ltc_ecc_projective_add_point(ecc_point *P, ecc_point *Q, ecc_point *R, mpz_t modulus);
+
+/* R = kG */
+int ltc_ecc_mulmod(mpz_t k, ecc_point *G, ecc_point *R, mpz_t modulus, int map);
+
+/* map P to affine from projective */
+int ltc_ecc_map(ecc_point *P, mpz_t modulus);
+
+/* helper functions */
+int mp_init_multi(mpz_t *a, ...);
+void mp_clear_multi(mpz_t *a, ...);
+unsigned long mp_unsigned_bin_size(mpz_t a);
+int mp_to_unsigned_bin(mpz_t a, unsigned char *b);
+int mp_read_unsigned_bin(mpz_t a, unsigned char *b, unsigned long len);
+#define mp_isodd(a)                  (mpz_size(a) > 0 ? (mpz_getlimbn(a, 0) & 1 ? 1 : 0) : 0)
+
+#define MP_DIGIT_BIT (sizeof(mp_limb_t) * 8 - GMP_NAIL_BITS)