I'm writing my engineering thesis about cc2420 AES encryption. I found
that there is a problem in tos 2.1.2. Neither CC2420SecurityTest nor
tutorial program
fromhttp://tinyos.stanford.edu/tinyos-wiki/index.php/CC2420_Security_Tutorial
works properly.
In CC2420SecurityTest even if i changed encryption key packets were
being received normaly while they should not. In the program from
tutorial compiler returned the error:
TOS
biszkopt@biszkopt-VirtualBox:/opt/tinyos-2.1.2/apps/tests/cc2420/TestSecurity/RadioCountToLeds1$
make telosb
mkdir -p build/telosb
compiling RadioCountToLedsAppC to a telosb binary
ncc -o build/telosb/main.exe -Os -fnesc-separator=__ -Wall -Wshadow -Wnesc-all
-target=telosb -fnesc-cfile=build/telosb/app.c -board=
-DDEFINED_TOS_AM_GROUP=0x22 -DCC2420_HW_ACKNOWLEDGEMENTS -DCC2420_HW_SECURITY
-DPACKET_LINK -DTOSH_DATA_LENGTH=115 -I/opt/tinyos-2.1.2/tos/lib/printf
-DPRINTFUART_ENABLED -I./ -DIDENT_APPNAME=\"RadioCountToLed\"
-DIDENT_USERNAME=\"biszkopt\" -DIDENT_HOSTNAME=\"biszkopt-Virtua\"
-DIDENT_USERHASH=0x9064dbbbL -DIDENT_TIMESTAMP=0x52a71575L
-DIDENT_UIDHASH=0x74b076f8L RadioCountToLedsAppC.nc -lm
/opt/tinyos-2.1.2/tos/chips/cc2420/lpl/DummyLplC.nc:39:2: warning: #warning
"*** LOW POWER COMMUNICATIONS DISABLED ***"
/opt/tinyos-2.1.2/tos/chips/cc2420/link/PacketLinkC.nc:38:2: warning: #warning
"*** USING PACKET LINK LAYER"
/opt/tinyos-2.1.2/tos/chips/cc2420/security/SecAMSenderP.nc: In function
‘SecAMSenderP__0__AMSend__send’:
/opt/tinyos-2.1.2/tos/chips/cc2420/security/SecAMSenderP.nc:69:21: error:
lvalue required as left operand of assignment
/opt/tinyos-2.1.2/tos/chips/cc2420/security/SecAMSenderP.nc: In function
‘SecAMSenderP__0__CC2420SecurityMode__setCtr’:
/opt/tinyos-2.1.2/tos/chips/cc2420/security/SecAMSenderP.nc:105:21: error:
lvalue required as left operand of assignment
make: *** [exe0] Error 1
The difference between them is that in the Makefile file in
CC2420SecurityTest there is additional line:
CFLAGS+=-DTFRAMES_ENABLED.
When I deleted that line compiler returned the same error as in
tuturial example.
I found the solution - change lines:
#if ! defined(TFRAMES_ENABLED)
(uint8_t*)secHdr += 1;
#endif
to:
#if ! defined(TFRAMES_ENABLED)
secHdr=(security_header_t*)((uint8_t*)secHdr+1);
#endif
in tinyos-2.1.2/tos/chips/cc2420/security/SecAMSenderP.nc
Łukasz Szubart
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