many changes: * fix CC malleability * extra validations for CCs such as requiring a signature and limiting types * different SIGHASH types for CC

src/komodo_cc.cpp

@@ -0,0 +1,44 @@
+#include "cryptoconditions/include/cryptoconditions.h"
+#include "komodo_cc.h"
+
+
+bool IsCryptoConditionsEnabled()
+{
+    return 0 != ASSETCHAINS_CC;
+}
+
+// Limit acceptable condition types
+// Prefix not enabled because no current use case, ambiguity on how to combine with secp256k1
+// RSA not enabled because no current use case, not implemented
+int CCEnabledTypes = 1 << CC_Secp256k1 | \
+                     1 << CC_Threshold | \
+                     1 << CC_Eval | \
+                     1 << CC_Preimage | \
+                     1 << CC_Ed25519;
+
+
+int CCSigningNodes = 1 << CC_Ed25519 | 1 << CC_Secp256k1;
+
+
+bool IsSupportedCryptoCondition(const CC *cond)
+{
+    int mask = cc_typeMask(cond);
+
+    if (mask & ~CCEnabledTypes) return false;
+
+    // Also require that the condition have at least one signable node
+    if (!(mask & CCSigningNodes)) return false;
+
+    return true;
+}
+
+
+bool IsSignedCryptoCondition(const CC *cond)
+{
+    if (!cc_isFulfilled(cond)) return false;
+    if (1 << cc_typeId(cond) & CCSigningNodes) return true;
+    if (cc_typeId(cond) == CC_Threshold)
+        for (int i=0; i<cond->size; i++)
+            if (IsSignedCryptoCondition(cond->subconditions[i])) return true;
+    return false;
+}