moved sources to appropriate directories

1 files changed, 244 insertions, 0 deletions

diff --git a/src/onetimebluh.c b/src/onetimebluh.c
new file mode 100644
index 0000000..8c46524
--- /dev/null
+++ b/src/onetimebluh.c
@@ -0,0 +1,244 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <openssl/rand.h>
+#include <unistd.h>
+#include <errno.h>
+#include <error.h>
+
+void xor(int ed, char* mess, char* keyf, char* outp);		/* operates the bitwise XOR between mess and keyf and puts the output to outp */
+void keyrand(int nb, char* outp);				/* generates random numbers using RAND_bytes from openssl and puts them into outp */
+void help(char* av[]);						/* prints the help message */
+
+int main(int argc, char* argv[]) {
+
+	int opt = 1;
+	int command = 0;
+	int comm = 0;
+	int tear = 0;
+	char* message = NULL;
+	char* keyfile = NULL;
+	char* output = NULL;
+	int nbytes = -1;	// must be resolved temporary workaround (ho sonno)
+
+	/* The following while cycle parses the argv vector to find commands, options and relative arguments
+	   using the function getopt_long */
+
+	while (opt) {
+		int option_index = 0;
+		static struct option options[] = {
+			{"decrypt",	required_argument,	0,	'd'},
+			{"encrypt",	required_argument,	0,	'e'},
+			{"key-file",	required_argument,	0,	'k'},
+			{"key-gen",	no_argument,		0,	'g'},
+			{"help",	no_argument,		0,	'h'},
+			{"nbytes",	required_argument,	0,	'b'},
+			{"output",	required_argument,	0,	'o'},
+			{"tear-page",	no_argument,		0,	't'},
+			{0,		0,			0,	0},
+		};
+
+		if ((opt = getopt_long(argc, argv, "b:d:e:ghk:o:t", options, &option_index)) == -1)
+			break;
+
+		switch (opt) {
+		case 'b':
+			nbytes = atoi(argv[optind-1]);
+			break;
+		case 'd':
+			message = argv[optind-1];
+			command++;
+			comm = 'u';
+			break;
+		case 'e':
+			message = argv[optind-1];
+			if (access(message, F_OK) == -1) {		/* checks the existence of the file and eventually exits */
+				error(errno, errno, message);
+			}
+			command++;
+			comm = 'e';
+			break;
+		case 'g':
+			command++;
+			comm = 'g';
+			break;
+		case 'h':
+			help(argv);
+			command++;
+			break;
+		case 'k':
+			keyfile = argv[optind-1];
+			if (access(keyfile, F_OK) == -1) {		/* look at the comment before */
+				error(errno, errno, keyfile);
+			}
+			break;
+		case 'o':
+			output = argv[optind-1];
+			break;
+		case 't':
+			tear = 1;
+			break;
+		case '?':
+			break;
+		default:
+			printf("carachter code returned 0%o \n", opt);
+		}
+	}
+
+	/* Next section performs some input checks */
+
+	if (command == 0) {
+		printf("No command called \n");
+		exit(EXIT_FAILURE);
+	} else if (command > 1) {
+		printf("Multiple commands called \n");
+		printf("%s [COMMAND] [OPTIONS] ... \n",argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (optind < argc) {
+		printf("Too many arguments \n");
+		exit(EXIT_FAILURE);
+	}
+
+	/* Next section detects the functions to call */
+
+	if (comm == 'e' || comm == 'u') {
+		if (keyfile == NULL) {
+			printf("No key specified: exit! \n");
+			exit(EXIT_FAILURE);
+		}
+		if (tear == 1) {
+			comm++;
+		}
+		xor(comm, message, keyfile, output);
+	} else if (comm == 'g') {
+		keyrand(nbytes, output);
+	}
+
+	exit(EXIT_SUCCESS);
+}
+
+void xor(int ed, char* mess, char* keyf, char* outp) {
+
+	char* defenoutp = "critt";
+	char* defdeoutp = "decritt";
+
+	/* In absence of input by users nex block sets the default values */
+
+	if (outp == NULL) {
+		if (ed == 'e' || ed == 'f') {
+			printf("WARNING no output name specified using default value 'critt' \n");
+			outp = defenoutp;
+		} else if (ed == 'u' || ed == 'v') {
+			printf("WARNING no output name specified usign default value 'decritt' \n");
+			outp = defdeoutp;
+		}
+	}
+
+	FILE* mex = fopen(mess, "r");
+	FILE* keyx = fopen(keyf, "r+");
+	FILE* critt = fopen(outp, "w");
+
+	long mess_size;
+	long pad_size;
+
+	if (ed == 'f' || ed == 'v') {
+		fseek(mex, 0L, SEEK_END);
+		mess_size = ftell(mex);
+		rewind(mex);
+		fseek(keyx, 0L, SEEK_END);
+		pad_size = ftell(keyx);
+		fseek(keyx, (pad_size - mess_size), SEEK_SET);
+	}
+
+	int i = 1;
+	char a, b;
+
+	while (i != EOF) {
+		i = fscanf(mex, "%c", &a);
+		fscanf(keyx, "%c", &b);
+		if(i != EOF) {
+			fprintf(critt, "%c", a^b);
+		}
+	}
+
+	if (ed == 'f' || ed == 'v') {
+		ftruncate(fileno(keyx), (pad_size - mess_size));
+		fseek(keyx, 0L, SEEK_END);
+		long new_pad_size = ftell(keyx);
+		printf("Your pad is now %li bytes shorter \n", mess_size);
+		printf("You now have %li bytes left \n", new_pad_size);
+	}
+
+	fclose(mex);
+	fclose(keyx);
+	fclose(critt);
+
+	if (ed == 'e' || ed == 'f') {
+		printf("Message successfully encrypted \n");
+	} else if (ed == 'u' || ed == 'v') {
+		printf("Message successfully decrypted \n");
+	}
+
+	return;
+}
+
+void keyrand(int nb, char* outp) {
+
+	char* defoutp = "default.key";
+
+	/* Next block controls the inputs and eventually sets the default values */
+
+	if((nb == -1) && (outp == NULL)) {
+		printf("WARNING no option specified usign default values... \n");
+		nb = 256;
+		outp = defoutp;
+	}
+	if (nb < -1) {		// orribile
+		printf("Negative byte value inserted! \n");
+		printf("Exiting... \n");
+		exit(EXIT_FAILURE);
+	} else if (nb != 0) {
+		if(nb == -1) {
+			printf("No byte number specified... using default value: 256 \n");
+			nb = 256;
+		}
+
+		unsigned char key[nb];
+		RAND_bytes(key, nb);
+
+		if (outp == NULL) {
+			outp = defoutp;
+			printf("No output name specified... using default value: default.key \n");
+		}
+
+		FILE* file = fopen(outp, "w");
+		fwrite(key, sizeof(char), nb, file);
+		fclose(file);
+		printf("Created key file %s of %d bytes \n", outp, nb);
+	} else {
+		printf("Byte number specified is 0. \n");
+		printf("Doing nothing! \n");
+	}
+
+	return;
+}
+
+void help(char* av[]) {
+	fprintf(stdout,"ONETIMEBLUH USAGE: \n"
+	"%s [COMMAND] [OPTIONS] \n \n"
+	"COMMANDS: \n"
+	"-d, --decrypt=FILE	decrypt message (input) same ad --encrypt, just for the feeling \n"
+	"-e, --encrypt=FILE	encrypt message (input) \n"
+	"-h, --help		print this help \n"
+	"-g, --key-gen		create key file \n \n"
+	"OPTIONS \n"
+	"-k, --key-file=KEY_FILE	use key (input) \n"
+	"-b, --nbytes=NUM	number of bytes \n"
+	"-o, --output=FILE	output name \n"
+	"-t, --tear-page		deletes from the pad file the bytes used to encrypt/decrypt \n \n"
+	"Onetimebluh project repository at https://git.eigenlab.org/Seppia/onetimebluh \n", av[0]);
+
+	return;
+}