diff --git a/src/cc/CCinclude.h b/src/cc/CCinclude.h
index b7186e317..1af6ef4d1 100644
--- a/src/cc/CCinclude.h
+++ b/src/cc/CCinclude.h
@@ -30,6 +30,8 @@
 
 
 #define SMALLVAL 0.000000000000001
+union _bits256 { uint8_t bytes[32]; uint16_t ushorts[16]; uint32_t uints[8]; uint64_t ulongs[4]; uint64_t txid; };
+typedef union _bits256 bits256;
 
 struct CCcontract_info
 {
@@ -79,4 +81,10 @@ void SetCCtxids(std::vector<std::pair<CAddressIndexKey, CAmount> > &addressIndex
 uint64_t AddNormalinputs(CMutableTransaction &mtx,CPubKey mypk,uint64_t total,int32_t maxinputs);
 uint64_t CCutxovalue(char *coinaddr,uint256 utxotxid,int32_t utxovout);
 
+// curve25519 and sha256
+bits256 curve25519_shared(bits256 privkey,bits256 otherpub);
+bits256 curve25519_basepoint9();
+bits256 curve25519(bits256 mysecret,bits256 basepoint);
+void vcalc_sha256(char deprecated[(256 >> 3) * 2 + 1],uint8_t hash[256 >> 3],uint8_t *src,int32_t len);
+
 #endif
diff --git a/src/cc/dice.cpp b/src/cc/dice.cpp
index ab6e9bdf7..b54caaa24 100644
--- a/src/cc/dice.cpp
+++ b/src/cc/dice.cpp
@@ -26,25 +26,25 @@
  2. and 3. can be done in mempool
  */
 
-void vcalc_sha256(char deprecated[(256 >> 3) * 2 + 1],uint8_t hash[256 >> 3],uint8_t *src,int32_t len);
-void ed25519_create_keypair(uint8_t *,uint8_t *,uint8_t *);
-void ed25519_key_exchange(uint8_t *,uint8_t *,uint8_t *);
-
-uint256 DiceHashEntropy(uint256 &entropy,uint256 txidseed) // assumes little endian CPU and max 1 vout per txid used
+uint256 DiceHashEntropy(uint256 &entropy,uint256 txidpriv) // assumes little endian CPU and max 1 vout per txid used
 {
-    int32_t i; uint8_t tmp256[32],tmpseed[32],txidpub[32],txidpriv[32],mypriv[32],mypub[32],myseed[32],ssecret[32],ssecret2[32]; uint256 hentropy;
+    int32_t i; bits256 tmp256,txidpub,mypriv,mypub,ssecret,ssecret2; uint256 hentropy;
     memset(&hentropy,0,32);
-    ed25519_create_keypair(txidpub,txidpriv,(uint8_t *)&txidseed);
-    Myprivkey(tmp256);
-    vcalc_sha256(0,tmpseed,tmp256,32);
-    ed25519_create_keypair(mypub,mypriv,tmpseed);
-    ed25519_key_exchange(ssecret,txidpub,mypriv);
-    ed25519_key_exchange(ssecret2,mypub,txidpriv);
-    if ( memcmp(ssecret,ssecret2,32) == 0 )
+    txidpriv.bytes[0] &= 0xf8, txidpriv.bytes[31] &= 0x7f, txidpriv.bytes[31] |= 0x40;
+    txidpub = curve25519(txidpriv,curve25519_basepoint9());
+
+    Myprivkey(tmp256.bytes);
+    vcalc_sha256(0,mypriv.bytes,tmp256.bytes,32);
+    mypriv.bytes[0] &= 0xf8, mypriv.bytes[31] &= 0x7f, mypriv.bytes[31] |= 0x40;
+    mypub = curve25519(mypriv,curve25519_basepoint9());
+
+    ssecret = curve25519_shared(txidpub,mypriv);
+    ssecret2 = curve25519_shared(mypub,txidpriv);
+    if ( memcmp(ssecret.bytes,ssecret2.bytes,32) == 0 )
     {
-        vcalc_sha256(0,(uint8_t *)&entropy,ssecret,32);
+        vcalc_sha256(0,(uint8_t *)&entropy,ssecret.bytes,32);
         vcalc_sha256(0,(uint8_t *)&hentropy,(uint8_t *)&entropy,32);
-    }
+    } else fprintf(stderr,"shared secrets dont match\n");
     return(hentropy);
 }