diff --git a/trial1/layer1.c b/trial1/layer1.c
new file mode 100644
index 0000000..5845e53
--- /dev/null
+++ b/trial1/layer1.c
@@ -0,0 +1,132 @@
+#include "layer1.h"
+
+
+//Layer 1 functions
+
+#define UDSFILE "./out/RANDFILE"
+#define UDSsize 8	//bytes
+
+
+int createUDS()
+{
+	int ret = RAND_write_file(UDSFILE);
+	if (ret == -1)
+		perror("rand write to file failed\n");
+	printf("\n %d bytes written to file\n", ret);
+	//readUDS();
+	return 0;
+}
+
+int readUDS(uint8_t* UDS_M)
+{
+	//1. Create RANDFILE if it does not exist. skip if it exists
+	//2. Load RANDFILE
+	//3. Read 64 bits to UDSbuf and compute hash into input arg.
+	//4. free UDSbuf
+
+	BIO *fp, *out;
+	int i;
+
+	//uint8_t UDSbuf[UDSsize] = {0};
+	//uint8_t UDS_M[SHA256_dig_t] = {0};
+
+	uint8_t* UDSbuf = calloc(1,sizeof(uint8_t)*UDSsize);
+	//uint8_t* UDS_M = calloc(1,sizeof(uint8_t)*SHA256_dig_t);
+
+
+	out = BIO_new_fp(stdout, BIO_NOCLOSE);
+
+	int ret = RAND_load_file(UDSFILE, 8);
+	while (ret < 0)
+	{
+		perror("Could not load seed file\n");
+		BIO_printf(out,"Creating new seed file\n");
+		createUDS();
+		ret = RAND_load_file(UDSFILE, 8);
+	}
+
+
+	fp = BIO_new_file(UDSFILE, "r");
+	if(!fp)
+		perror("Opening seed file to read failed\n");
+	
+	if (BIO_read(fp,UDSbuf,UDSsize) < 0)
+		perror("BIO read failed\n");
+
+	//Compute hash of UDS
+	if(SHA256(UDSbuf, UDSsize, UDS_M) == NULL)
+		perror("UDS measurement failed\n");
+
+	//Print block. delete later
+	for(i = 0; i < UDSsize; i++)
+	 	BIO_printf(out,"%x",UDSbuf[i]);
+	BIO_printf(out, "\n");
+
+	BIO_printf(out,"UDS digest : ");
+	for(i = 0; i < SHA256_dig_t; i++)
+	 	BIO_printf(out,"%x",UDS_M[i]);
+	BIO_printf(out, "\n");
+
+	free(UDSbuf);
+	BIO_free(fp);
+	BIO_free(out);
+	return 1;
+
+}
+
+
+int readFWID(uint8_t * FW_M)
+{
+	//1. Read layer1.c into memory
+	//2. Calcualte hash into arg
+
+	printf("in readFWID\n");
+
+	uint8_t * source = NULL;
+	BIO *fp, *out;
+	int filesize = 0;
+	int i;
+
+	out = BIO_new_fp(stdout, BIO_NOCLOSE);
+	fp = BIO_new_file("layer1.c", "r");
+printf("in 2readFWID\n");
+	if(!fp)
+		perror("Opening FW to read failed\n");
+
+	if(BIO_eof(fp))
+		perror("File empty\n");
+printf("in 3readFWID\n");					//SEG FAULT!
+	while(!BIO_eof(fp))
+	{
+		BIO_read(fp, source[filesize], 1);
+		filesize++;				//filesize includes EOF
+	}
+printf("in 4readFWID\n");
+	if(SHA256(source, filesize -1, FW_M) == NULL)
+		perror("FW measurement failed\n");
+
+
+	//print block
+printf("in 5readFWID\n");
+	BIO_printf(out,"FW digest : ");
+	for(i = 0; i < SHA256_dig_t; i++)
+	 	BIO_printf(out,"%x",FW_M[i]);
+	BIO_printf(out, "\n");
+
+	//free(source);
+	BIO_free(fp);
+	BIO_free(out);
+	return 1;
+
+}
+
+// int calcCDID(uint8_t * UDS_M, uint8_t * FW_M, uint8_t * CDID)
+// {
+// 	//0. internally call readUDS and readFWID? abstraction of UDS against layer2
+
+// 	//1. create sha256 context
+// 	//2. add UDS hash
+// 	//3. add FW hash
+// 	//4. calc composite hash into CDID arg
+// 	return 1;
+// }
\ No newline at end of file
diff --git a/trial1/layer1.h b/trial1/layer1.h
new file mode 100644
index 0000000..58e26a1
--- /dev/null
+++ b/trial1/layer1.h
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <openssl/rand.h>
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/sha.h>
+
+#define SHA256_dig_t 32	//bytes
+
+int readUDS(uint8_t* UDSdigest);
+int createUDS();
+int readFWID(uint8_t * FW_M);
+int calcCDID(uint8_t * UDS_M, uint8_t * FW_M, uint8_t * CDID);
+
+
diff --git a/trial1/layer2.c b/trial1/layer2.c
new file mode 100644
index 0000000..21c77fd
--- /dev/null
+++ b/trial1/layer2.c
@@ -0,0 +1,27 @@
+#include "layer2.h"
+
+
+
+void startProtocol()
+{
+
+	//step 1 : Derive Device ID
+	uint8_t* UDS_ID = calloc(1,sizeof(uint8_t)*SHA256_dig_t);
+	readUDS(UDS_ID);
+
+	//step 2 : Derive Firmware ID
+	uint8_t* FW_ID = calloc(1,sizeof(uint8_t)*SHA256_dig_t);
+	readFWID(FW_ID);
+
+
+	// //setp 3 : Derive Composite Device ID
+	// uint8_t* CD_ID = calloc(1,sizeof(uint8_t)*SHA256_dig_t);
+	// calcCDID(CD_ID);
+
+
+	//End block
+	free(UDS_ID);
+	free(FW_ID);
+	// free(CD_ID);
+}
+
diff --git a/trial1/layer2.h b/trial1/layer2.h
new file mode 100644
index 0000000..06361a1
--- /dev/null
+++ b/trial1/layer2.h
@@ -0,0 +1,13 @@
+#include "layer1.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <openssl/rand.h>
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/sha.h>
+
+
+#define SHA256_dig_t 32	//bytes
+
+void startProtocol();
\ No newline at end of file