added generaterandomcontract function

internal/contracts/contracts.go

@@ -4,12 +4,14 @@ import (
 	"bytes"
 	"crypto/ecdsa"
 	"crypto/rand"
+
 	"encoding/binary"
 	"encoding/hex"
 	"errors"
 	"fmt"
 	"reflect"
-
+
+
 	"github.com/SIGBlockchain/project_aurum/internal/hashing"
 	"github.com/SIGBlockchain/project_aurum/internal/publickey"
 )
@@ -55,7 +57,7 @@ func New(version uint16, sender *ecdsa.PrivateKey, recipient []byte, value uint6
 
 	if version == 0 {
 		return nil, errors.New("Invalid version; must be >= 1")
-	}
+	}               
 
 	c := Contract{
 		Version:         version,
@@ -274,4 +276,34 @@ func (mc *JSONContract) Unmarshal() (Contract, error) {
 		mc.StateNonce,
 	}
 	return c, nil
+
+}
+
+
+
+func GenerateRandomContract() (*Contract, error){
+	b := make([]byte, 32)
+	_, err :=rand.Read(b)
+
+	genRecipPubKeyHash :=  b
+	genVersion := binary.LittleEndian.Uint16(b[0:])
+	genValue := binary.LittleEndian.Uint64(b[1:])
+	genStateNonce := binary.LittleEndian.Uint64(b[2:])
+	//checks if rand.Read return nil. if err equals nil
+	if err != nil {
+		fmt.Println("error:", err) 
+		return nil, err
+	}
+
+	c:= &Contract{
+		RecipPubKeyHash: genRecipPubKeyHash,
+		Version: genVersion,
+		Value: genValue,
+		StateNonce: genStateNonce,
+	}
+	return c, nil
+
 }
+
+
+