OpenVMS Source-Code Demos

ssl_aes_demo01

1000	!==================================================================================
	! title  : SSL_AES_DEMO01.BAS
	! author : Neil Rieck
	! created: 2017-12-12
	! notes  : 1. this demo program is much larger than it needs to be. Additional code
	!	      was added here to double-check the output of this logic against AES
	!	      demo websites (see embedded html links below)
	!	   2. never place this code into production without extensive testing. You
	!	      would not want to store encrypted data only to discover that future
	!	      changes left older data unusable.
	!==================================================================================
	option type=explicit							! no kid stuff
	!
	!	home brewed c code (see: SSL_AES_API_DEMO01.C)
	!
	external long function NSR_AES_ENCRYPT(string,string,string,string,string,long by value)
	external long function NSR_AES_DECRYPT(string,string,string,string,       long by value)
	!
	!	home brewed BASIC code
	!
	external string function plain_to_hex(string)
	!
	!	data declarations
	!
	declare string constant	k_bell	= '7'C	 !
	!
	declare string 	plaintext$		,! plain text			&
			hex_iv$			,! initialization vector	&
			key$			,! key phrase			&
			hex_encrypted$		,! encrypted text (hex)		&
			b64_encrypted$		,! encrypted text (base64) 	&
			expected$		,! hex -or- base64		&
			decrypted$		,! decrypted plain text		&
		long	i%			,!				&
			test%			,!				&
			debug%			 !
	!
	!=======================================================================
	!	main
	!=======================================================================
	main:
	debug% = 0
	debug% = 1
	!
	!	test case #1
	!
	!	notes:	1) these data values were hard-coded into file "sys$examples:SSL$AES.C"
	!		2) the results were visible in the dump of RMS file "TEST.ENC"
	!
	print
	print "test case #1 ==================================================="
	plaintext$ = "1234567890123456789012345678901234567890123456789012345678901234567890123456789"
	hex_iv$	= ""								! blank means do not set IV
	key$	= "This is my simple encryption key"				!
	print "-i-calling external function to encrypt"
	i%	= NSR_AES_ENCRYPT(	plaintext$,				! out	&
					hex_iv$,				! out	&
					key$,					! out	&
					hex_encrypted$,				! in	&
					b64_encrypted$,				! in	&
					debug%)					! out
	expected$  =	"a9db19d1ccc67451482ad2eb156d18b8a43faf6a"	+&
			"844e300755478f207f0058ba3109568c1a088f70"	+&
			"7a2871fbba7f0f4d9caf99a2c15d2c8658630837"	+&
			"803582ab112a6c93b6bb8a047963006455729d43"
	gosub display_results1							!
	!
	!	okay now see if we can decrypt
	!
	decrypted$ = ""								! init
	print "-i-calling external function to decrypt"
	i%	= NSR_AES_DECRYPT(	hex_encrypted$,				! out	&
					hex_iv$,				! out	&
					key$,					! out	&
					decrypted$,				! in	&
					debug%)					! out
	gosub display_results2							!
	!=======================================================================
	!
	!	test case #2 (should produce the same results as above)
	!
	print
	print "test case #2 ==================================================="
	plaintext$ = "1234567890123456789012345678901234567890123456789012345678901234567890123456789"
	hex_iv$	= "0000000000000000000000"					!
	key$	= "This is my simple encryption key"				!
	print "-i-calling external function to encrypt"
	i%	= NSR_AES_ENCRYPT(	plaintext$,				&
					hex_iv$,				&
					key$,					&
					hex_encrypted$,				! in	&
					b64_encrypted$,				! in	&
					debug%)					! out
	print "-i-back in BASIC"
	gosub display_results1
	!
	!	okay now see if we can decrypt
	!
	decrypted$ = ""								! init
	print "-i-calling external function to decrypt"
	i%	= NSR_AES_DECRYPT(	hex_encrypted$,				! out	&
					hex_iv$,				! out	&
					key$,					! out	&
					decrypted$,				! in	&
					debug%)					! out
	gosub display_results2							!
	!=======================================================================
	!
	!	test case #3
	!
	!	aes verification sites:
	!	1) http://rubbingalcoholic.github.io/cowcrypt/demos/aes.html
	!	2) http://aes.online-domain-tools.com	(be sure to select "CBC")
	!
	print
	print "test case #3 ==================================================="
	plaintext$ = "this is a test"						!
	hex_iv$	= "9876543210fedcba9876543210fedcba"				! hex representation of IV
	key$	= "This is my simple encryption key"				!
	print "-i-calling external function to encrypt"
	i%	= NSR_AES_ENCRYPT(	plaintext$,				&
					hex_iv$,				&
					key$,					&
					hex_encrypted$,				! in	&
					b64_encrypted$,				! in	&
					debug%)					! out
	expected$ = "fyZhAlzK7dTDL+LMrE4cGw=="
	gosub display_results1
	!
	!	okay now see if we can decrypt
	!
	decrypted$ = ""								! init
	print "-i-calling external function to decrypt"
	i%	= NSR_AES_DECRYPT(	hex_encrypted$,				! out	&
					hex_iv$,				! out	&
					key$,					! out	&
					decrypted$,				! in	&
					debug%)					! out
	gosub display_results2							!
	!=======================================================================
	goto fini								! ***--->>>
	!
	!=======================================================================
	!	display results 1 (after encryption)
	!=======================================================================
	display_results1:
	print "-i-back in BASIC"
	print "-i-encryp status: " ;str$(i%);
	if i% = 1 then
	    print " (success)"
	else
	    print " (failed)"+ k_bell
	end if
	print	"-i-plain text   : "; plaintext$
	print	"-i-hex iv       : "; hex_iv$
	print	"-i-plain key    : "; key$
	print	"-i-hex   key    : "; plain_to_hex(key$)
	print	"-i-hex encryped : "; hex_encrypted$				!
	print	"-i-b64 encryped : "; b64_encrypted$				!
	print	"-i-expected     : "; expected$					!
	if expected$ <> "" then
	    test% = 0
	    test% = 1 if hex_encrypted$ = expected$
	    test% = 1 if b64_encrypted$ = expected$
	    if test% = 0 then
		print "-e-expected encrypted data test FAILED"+ k_bell
	    else
		print "-i-expected encrypted data test PASSED"
	    end if
	else
	    print "-w-expected data test NOT PERFORMED"
	end if
	sleep 1
	return
	!=======================================================================
	!	display results 2 (after decryption)
	!=======================================================================
	display_results2:
	print	"-i-back in BASIC"
	print	"-i-decryp status:"; i%;
	if i% = 1 then
	    print "(success)"
	else
	    print "(failed)"+ k_bell
	end if
	print "-i-decrypted : "; decrypted$
	print "-i-original  : "; plaintext$
	if plaintext$ = decrypted$ then
	    print "-i-data match - decryption was sucessful"
	else
	    print "-e-data mismatch - decryption FAILED"+ k_bell
	end if
	return
	!=======================================================================
	!	that's all folks
	!=======================================================================
	fini:
	print "-i-program exiting"
32000	end
	!===============================================================================
	!  I need this because one AES web site requires me to enter the key in HEX
	!===============================================================================
32100	function string plain_to_hex(string inbound$)
	option type=explicit
	declare string constant k_hex = "0123456789abcdef"
	declare	long	i,x,y,z,			&
		string	temp$,				&
			junk$				!
	for i = 1 to len(inbound$)			!
	    junk$ = mid$(inbound$,i,1)			!
	    x = ascii(junk$)				!
	    y = x / 16					!
	    z = mod(x,16)				!
	    temp$ = temp$ + mid$(k_hex, y+1, 1)
	    temp$ = temp$ + mid$(k_hex, z+1, 1)
	next i						!
	plain_to_hex = temp$				!
	end function

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Neil Rieck
Kitchener - Waterloo - Cambridge, Ontario, Canada.