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fixed KDF

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This commit is contained in:
atul.jha 2020-05-27 15:58:52 +02:00
parent f72659738d
commit ceb7014e9d
4 changed files with 61 additions and 58 deletions
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71
trial1/layer1.c
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@ -148,15 +148,15 @@ int calcCDID(uint8_t * UDS_M, uint8_t * FW_M, uint8_t * CDID)
//print block
BIO_printf(out,"UDID_M : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",UDS_M[i]);
BIO_printf(out, "\n");
// BIO_printf(out,"UDID_M : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// BIO_printf(out,"%x",UDS_M[i]);
// BIO_printf(out, "\n");
BIO_printf(out,"FWID_M : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",FW_M[i]);
BIO_printf(out, "\n");
// BIO_printf(out,"FWID_M : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// BIO_printf(out,"%x",FW_M[i]);
// BIO_printf(out, "\n");
BIO_printf(out,"CDI : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
@ -190,36 +190,43 @@ int _calcCDID(uint8_t * _CDID)
uint8_t* FW_ID = calloc(1,sizeof(uint8_t)*SHA256_DGST_SIZE);
readFWID(FW_ID);
//step3 : call calcCDID
////step3 : call calcCDID
calcCDID(UDS_ID,FW_ID,_CDID);
// BIO_printf(out,"_UDID : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// BIO_printf(out,"%x",UDS_ID[i]);
// BIO_printf(out, "\n");
// BIO_printf(out,"_FWID : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// BIO_printf(out,"%x",FW_ID[i]);
// BIO_printf(out, "\n");
BIO_printf(out,"_CDI : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",_CDID[i]);
BIO_printf(out, " : wrap \n\n\n");
// BIO_printf(out,"_CDI : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// BIO_printf(out,"%x",_CDID[i]);
// BIO_printf(out, "\n");
//attempt 2 : use SHA256 here
BIO_printf(out,"_UDID : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",UDS_ID[i]);
BIO_printf(out, "\n");
// SHA256_CTX *ctx;
// if(!SHA256_Init(ctx))
// perror("SHA init failed\n");
BIO_printf(out,"_FWID : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",FW_ID[i]);
BIO_printf(out, "\n");
// if(!SHA256_Update(ctx, UDS_ID, UDSsize))
// perror("SHA update failed\n");
// if(!SHA256_Update(ctx, FW_ID, FW_size))
// perror("SHA update2 failed\n");
memset(_CDID, 0, SHA256_DGST_SIZE);
// if(!SHA256_Final(_CDID, ctx))
// perror("SHA close failed\n");
BIO_printf(out,"_CDI 0 : ");
for(int i = 0; i < SHA256_DGST_SIZE; i++)
BIO_printf(out,"%x",_CDID[i]);
BIO_printf(out, "\n");
SHA256_CTX *ctx;
if(!SHA256_Init(ctx))
perror("SHA init failed\n");
if(!SHA256_Update(ctx, UDS_ID, UDSsize))
perror("SHA update failed\n");
if(!SHA256_Update(ctx, FW_ID, FW_size))
perror("SHA update2 failed\n");
if(!SHA256_Final(_CDID, ctx))
perror("SHA close failed\n");

1
trial1/layer1.h
View File

@ -1,5 +1,6 @@
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <openssl/rand.h>
#include <openssl/bio.h>

45
trial1/layer2.c
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@ -11,7 +11,7 @@ void startCDIProtocol()
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// printf("%x",UDS_ID[i]);
// printf("\n");
// printf(" : UDS_ID, main\n");
//step 2 : Derive Firmware ID
uint8_t* FW_ID = calloc(1,sizeof(uint8_t)*SHA256_DGST_SIZE);
@ -19,7 +19,7 @@ void startCDIProtocol()
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// printf("%x",FW_ID[i]);
// printf("\n");
// printf(" : FW_ID, main\n");
//setp 3 : Derive Composite Device ID
@ -28,37 +28,33 @@ void startCDIProtocol()
free(UDS_ID);
free(FW_ID);
//uint8_t* _CD_ID = calloc(1,sizeof(uint8_t)*SHA256_DGST_SIZE);
// _calcCDID(_CD_ID);
for(int i = 0; i < SHA256_DGST_SIZE; i++)
printf("%x",CD_ID[i]);
printf( "\n");
// //wrapper funciton to avoid exposing UDS and FW measurements
// uint8_t* _CD_ID = calloc(1,sizeof(uint8_t)*SHA256_DGST_SIZE);
// _calcCDID(_CD_ID);
// printf( "CDID wrap : ");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// printf("%x",_CD_ID[i]);
// printf( "\n\n\n");
uint8_t* KEY_OUT = calloc(1,sizeof(uint8_t)*KDF_KEY_SIZE);
size_t KEY_LEN = KDF_KEY_SIZE; //need to pass pointer to the out key size, not the value
if(deriveKDF(KEY_OUT, &KEY_LEN, CD_ID, SHA256_DGST_SIZE, PASSPHRASE, lenofstr(PASSPHRASE)))
printf("KDF call success\n");;
printf("\n\nKDF call success\n");;
//return value iz not correct.
//first 6 bytes are random, inconsistent, followed by two 0s then the next bytes are correct
//very suspicious behaviour
//is this similar to _cacl_CDID fun issue?
//should i use memset memcp isntead of passing pointers?
//learn pointers more thoroughly
for(int i = 0; i <= KDF_KEY_SIZE; i++)
printf("%x,",KEY_OUT[i]);
printf( ":KEY_OUT\n");
printf( " : KEY_OUT\n");
//End block
free(CD_ID);
//free(_CD_ID);
//free(_CD_ID); //for wrapper function
}
@ -67,16 +63,16 @@ int deriveKDF(uint8_t * out, size_t * out_len, uint8_t * secret, int secret_len,
//create comtext
//ctx set params
//passphrase
//secret
//secret //CDI
//alg //not taken as input. fixed to sha256
//salt //meh, hardcode salt too
//out
//hkdf derive key
for(int i = 0; i < SHA256_DGST_SIZE; i++)
printf("%x",secret[i]);
printf( " : secret\n");
// for(int i = 0; i < SHA256_DGST_SIZE; i++)
// printf("%x",secret[i]);
// printf( " : secret\n");
//sample kdf prog
@ -105,12 +101,11 @@ int deriveKDF(uint8_t * out, size_t * out_len, uint8_t * secret, int secret_len,
if (EVP_PKEY_derive(pctx, out, out_len) <= 0)
perror("pkey derivation failed:");
for(int i = 0; i <= KDF_KEY_SIZE; i++)
printf("%x,",out[i]);
printf( ": OUT\n");
// for(int i = 0; i <= KDF_KEY_SIZE; i++)
// printf("%x,",out[i]);
// printf( ": OUT\n");
EVP_PKEY_CTX_free(pctx);
free(out);
return 1;
}

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trial1/out/main2
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