1 files changed, 0 insertions, 79 deletions
diff --git a/src/key_exchange.c b/src/key_exchange.c
deleted file mode 100644
index abd75da..0000000
--- a/src/key_exchange.c
+++ /dev/null
@@ -1,79 +0,0 @@
-#include "ed25519.h"
-#include "fe.h"
-
-void ed25519_key_exchange(unsigned char *shared_secret, const unsigned char *public_key, const unsigned char *private_key) {
-    unsigned char e[32];
-    unsigned int i;
-    
-    fe x1;
-    fe x2;
-    fe z2;
-    fe x3;
-    fe z3;
-    fe tmp0;
-    fe tmp1;
-
-    int pos;
-    unsigned int swap;
-    unsigned int b;
-
-    /* copy the private key and make sure it's valid */
-    for (i = 0; i < 32; ++i) {
-        e[i] = private_key[i];
-    }
-
-    e[0] &= 248;
-    e[31] &= 63;
-    e[31] |= 64;
-
-    /* unpack the public key and convert edwards to montgomery */
-    /* due to CodesInChaos: montgomeryX = (edwardsY + 1)*inverse(1 - edwardsY) mod p */
-    fe_frombytes(x1, public_key);
-    fe_1(tmp1);
-    fe_add(tmp0, x1, tmp1);
-    fe_sub(tmp1, tmp1, x1);
-    fe_invert(tmp1, tmp1);
-    fe_mul(x1, tmp0, tmp1);
-
-    fe_1(x2);
-    fe_0(z2);
-    fe_copy(x3, x1);
-    fe_1(z3);
-
-    swap = 0;
-    for (pos = 254; pos >= 0; --pos) {
-        b = e[pos / 8] >> (pos & 7);
-        b &= 1;
-        swap ^= b;
-        fe_cswap(x2, x3, swap);
-        fe_cswap(z2, z3, swap);
-        swap = b;
-
-        /* from montgomery.h */
-        fe_sub(tmp0, x3, z3);
-        fe_sub(tmp1, x2, z2);
-        fe_add(x2, x2, z2);
-        fe_add(z2, x3, z3);
-        fe_mul(z3, tmp0, x2);
-        fe_mul(z2, z2, tmp1);
-        fe_sq(tmp0, tmp1);
-        fe_sq(tmp1, x2);
-        fe_add(x3, z3, z2);
-        fe_sub(z2, z3, z2);
-        fe_mul(x2, tmp1, tmp0);
-        fe_sub(tmp1, tmp1, tmp0);
-        fe_sq(z2, z2);
-        fe_mul121666(z3, tmp1);
-        fe_sq(x3, x3);
-        fe_add(tmp0, tmp0, z3);
-        fe_mul(z3, x1, z2);
-        fe_mul(z2, tmp1, tmp0);
-    }
-
-    fe_cswap(x2, x3, swap);
-    fe_cswap(z2, z3, swap);
-
-    fe_invert(z2, z2);
-    fe_mul(x2, x2, z2);
-    fe_tobytes(shared_secret, x2);
-}