Added read_crypt.c. It does what it says

1 files changed, 43 insertions, 0 deletions

diff --git a/read_crypt.c b/read_crypt.c
new file mode 100644
index 0000000..af3a7c0
--- /dev/null
+++ b/read_crypt.c
@@ -0,0 +1,43 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+
+int main(int argc, char *argv[])	{
+//reads a message <4096B and XORs it with key argv[1] in file argv[2]
+//message ends with string "@@@" after a white character.
+//To retrieve the original message, use onetimebluh.c
+FILE * keyfile = fopen(argv[1],"r");
+FILE * crypt = fopen(argv[2],"w");
+char msg[4096];
+
+printf("Write a message.\n It will be encrypted in file %s ",argv[2]);
+printf("with key %s\n",argv[1]);
+printf("When you're done, use the EOF sequence @@@. It must follow a white space!\n");
+
+char c_aux;
+int i=0,k=0;
+//scanf terminates at every white character, must be called by a While
+// "i" tells where you are in msg (which is overwritten each time)
+// "k" tells where you are in crypt 
+while(strcmp(msg,"@@@"))
+	{
+	scanf("%s",msg);
+	i=0;
+	while(msg[i]!='\0') {
+		fscanf(keyfile,"%c", &c_aux);
+		fprintf(crypt,"%c",msg[i]^c_aux);
+		i++;
+		k++;
+		}
+	fscanf(keyfile,"%c",&c_aux);
+	fprintf(crypt,"%c",' '^c_aux);
+	k++;
+	}
+
+while (k<4096){
+// fills the message with @s 
+	fscanf(keyfile,"%c",&c_aux);
+	fprintf(crypt,"%c",'@'^c_aux);
+	k++;}
+fclose(crypt);
+}