add method to convert secret to pub key

Author: keithsue

x/lending/types/utils.go

@@ -0,0 +1,15 @@
+package types
+
+import "github.com/btcsuite/btcd/btcec/v2"
+
+// SecretToPubKey gets the serialized public key of the given secret on the secp256k1 curve
+// Assume that the secret is 256-bit bytes
+func SecretToPubKey(secretBytes []byte) []byte {
+	var secret btcec.ModNScalar
+	_ = secret.SetByteSlice(secretBytes)
+
+	var result btcec.JacobianPoint
+	btcec.ScalarBaseMultNonConst(&secret, &result)
+
+	return btcec.JacobianToByteSlice(result)
+}