diff --git a/trial4/ROMprotocol.c b/trial4/ROMprotocol.c
index eb31ad4..0a9a8e4 100644
--- a/trial4/ROMprotocol.c
+++ b/trial4/ROMprotocol.c
@@ -156,9 +156,9 @@ if(DEBUG)
     						0xbe,0x67,0x0a,0xf8,0xf3,0x92,0x0e,0xba,
     						0x68,0xd1,0x56,0xea,0x34,0x3f,0xbc,0x4f		};
 
-    uint8_t * CDIKEY = calloc(1, sizeof(uint8_t)*CDI_KEY_SIZE);
+    uint8_t * CDIKEY = calloc(1, sizeof(uint8_t)*HKDF_KEY_SIZE);
 	ret = mbedtls_hkdf(md_info, salt, sizeof(salt), CDI, SHA256_DGST_SIZE,
-              IDENTITY, sizeof(IDENTITY), CDIKEY, CDI_KEY_SIZE);
+              IDENTITY, sizeof(IDENTITY), CDIKEY, HKDF_KEY_SIZE);
 
 	if(ret < DIMASUCCESS)
 	{
@@ -172,7 +172,7 @@ if(DEBUG)
 
 if(DEBUG)
 {
-	for(int i = 0; i < CDI_KEY_SIZE; i++)
+	for(int i = 0; i < HKDF_KEY_SIZE; i++)
       printf("%hhx",CDIKEY[i]);
 	printf(" :  CDIKEY\n");
 }
diff --git a/trial4/defines.h b/trial4/defines.h
index f100963..f4b1ada 100644
--- a/trial4/defines.h
+++ b/trial4/defines.h
@@ -26,7 +26,7 @@
 /* CONSTANTS TO BE USED IN DIMA */
 #define SHA256_DGST_SIZE 	32			//bytes
 #define UDS_SIZE			8
-#define CDI_KEY_SIZE		32
+#define HKDF_KEY_SIZE		32
 #define HKDF_ALG			MBEDTLS_MD_SHA256
 #define ECC_CURVE			MBEDTLS_ECP_DP_SECP256R1	//mbedtls_ecp_group_id
 #define RSA_HASH_ID			MBEDTLS_MD_SHA256 
diff --git a/trial4/main.c b/trial4/main.c
index 4c1e1c0..f6e78c4 100644
--- a/trial4/main.c
+++ b/trial4/main.c
@@ -10,7 +10,84 @@ void main()
 	ret = ROMprotocol();
 	/*release resources*/
 
-	//alias and session keys, firmware execution
+	//ALIAS and session keys, firmware execution
+
+	//measure firmware.bin
+	//measure firmware.conf
+	//measure ....
+	//calculate FW_ID - composite hash of all above measurements
+	//create ALIAS KD_ctx
+	//keygen
+	//publish keys
+
+
+	//placeholder FW_ID
+	uint8_t FW_ID[SHA256_DGST_SIZE] = {	0xf3,0x92,0x0e,0x4f,0xbe,0x67,0x0a,0xf8,
+											0xf1,0xd9,0x30,0xe2,0x33,0xcc,0x28,0xc5,
+    										0xba,0x68,0xd1,0x56,0xea,0x34,0x3f,0xbc,
+    										0xe6,0x66,0xbb,0x1e,0x7b,0xbb,0x38,0x7d	}; 
+
+    const mbedtls_md_info_t * md_info;
+	if(!(md_info = mbedtls_md_info_from_type(HKDF_ALG)))
+	{
+		perror("DIMAHKDFFAILURE: MD alg type def failed\n");
+		exit(DIMAHKDFFAILURE);
+	}
+
+    uint8_t salt[32] = {	0x68, 0x5e, 0x4e, 0xbe, 0xf2, 0xbe, 0xb9, 0xd5, 0x13, 
+    						0x7c, 0x14, 0x71, 0x20, 0xfb, 0x42, 0x32, 0x54, 0x12,
+    						0x3e, 0x31, 0xa6, 0x89, 0x4c, 0xe0, 0x58, 0x51, 0x0e,
+    						0x26, 0xb0, 0xdd, 0x78, 0x55    };
+
+    uint8_t * FWKEY = calloc(1, sizeof(uint8_t)*HKDF_KEY_SIZE);
+    ret = mbedtls_hkdf(md_info, salt, sizeof(salt), FW_ID, SHA256_DGST_SIZE,
+              ALIAS, sizeof(ALIAS), FWKEY, HKDF_KEY_SIZE);
+
+    if(ret < DIMASUCCESS)
+	{
+		perror("DIMAHKDFFAILURE\n");
+		exit(DIMAHKDFFAILURE);
+	}
+
+	KeyDrv_context ALIAS_ctx;
+	ALIAS_ctx.ENT_MODE = DFL_ENT;
+	ALIAS_ctx.PKC_MODE = DFL_PKC;
+	ALIAS_ctx.seed = FWKEY;
+	ALIAS_ctx.phrase = ALIAS;
+	ALIAS_ctx.KEY_FORM = DFL_FORM;
+
+	printf("Generating Alias keys\n");
+
+	ret = AsymmKeyGen(&ALIAS_ctx);
+	if(ret < DIMASUCCESS)
+	{
+		perror("DIMAFAILURE : ALIAS key gen failed\n");
+		exit(DIMAFAILURE);
+	}
+
+
+
+	//Session key creation
+	//receive session nonce from verifier?
+	//placeholder 
+	char * nonce = "session1";
+
+	KeyDrv_context SSN_ctx;
+	SSN_ctx.ENT_MODE = SW_PRNG;
+	SSN_ctx.PKC_MODE = DFL_PKC;
+	SSN_ctx.seed = FWKEY;
+	SSN_ctx.phrase = nonce;
+	SSN_ctx.KEY_FORM = DFL_FORM;
+
+	printf("Generating Session keys\n");
+
+	ret = AsymmKeyGen(&SSN_ctx);
+	if(ret < DIMASUCCESS)
+	{
+		perror("DIMAFAILURE : SESSION key gen failed\n");
+		exit(DIMAFAILURE);
+	}
+
 	printf("Successful exit\n");
 
 	return;
diff --git a/trial4/out/main b/trial4/out/main
index 1212411..e73f4e2 100755
Binary files a/trial4/out/main and b/trial4/out/main differ