-X: add simple XOR mode (embedded xor tool)

[tfcrypt.git] / tfc_error.c

diff --git a/tfc_error.c b/tfc_error.c
index 6f994ef7daacc28d9bc675d6058386b2b478de44..953ba0725a648f1079be4d5cd0ac2ec76f63a5c6 100644 (file)
--- a/tfc_error.c
+++ b/tfc_error.c
@@ -114,7 +114,7 @@ void usage(void)
 
        if (optopt == 'V') {
                tfc_say("tfcrypt toolkit, version %s.", _TFCRYPT_VERSION);
-               if (ctr_mode != TFC_MODE_PLAIN) {
+               if (do_edcrypt != TFC_DO_PLAIN) {
                        char shash[64];
 
                        hash_defaults(shash, sizeof(shash));
@@ -210,6 +210,22 @@ void usage(void)
                tfc_say("no error checking is performed.");
                tfc_say("\n");
        }
+       else if (!strcmp(progname, "xor")) {
+               is_embedded_prog = YES;
+               tfc_say("usage: %s [sourceX] [sourceY] [output]", progname);
+               tfc_say("\n");
+               tfc_say("tfcrypt embedded high performance XOR tool.");
+               tfc_say("It does XOR (multiply modulo 2) of each byte from sourceX");
+               tfc_say("each byte of sourceY and writes output.");
+               tfc_say("If filenames omitted, it is assumed to operate over");
+               tfc_say("standard in to standard out.");
+               tfc_say("If any of source files is shorter than another,");
+               tfc_say("then output is truncated to length of the shortest one.");
+               tfc_say("\n");
+               tfc_say("No error checking is performed.");
+               tfc_say("Please use iotool options there.");
+               tfc_say("\n");
+       }
        else if (!strcmp(progname, "tfbench")) {
                is_embedded_prog = YES;
                tfc_say("usage: %s seconds", progname);
@@ -364,6 +380,7 @@ void usage(void)
        tfc_say("    xctr=val: specify size in bytes of initial counter prepended or read.");
        tfc_say("    fullkey: occupy tweak space by key space, extending key size by 256 bits.");
        tfc_say("  -P: plain IO mode: disable encryption/decryption code at all.");
+       tfc_say("  -X: XOR IO mode: same as -P but do XOR of two streams.");
        tfc_say("\n");
        tfc_say("Default is to ask for password, then encrypt stdin into stdout.");
        tfc_say("Some cmdline parameters may be mutually exclusive, or they can");