Added rc4 files to project

1 files changed, 56 insertions, 0 deletions

diff --git a/rc4.c b/rc4.c
new file mode 100644
index 000000000000..d1d7267214ce
--- /dev/null
+++ b/rc4.c
@@ -0,0 +1,56 @@
+#include <ncurses.h>
+#include <stdlib.h>
+#include "rc4.h"
+
+#define PASS_MAX 32
+#define BACKSPACE 127
+
+char* getPassword() {
+    unsigned char* pass = calloc(PASS_MAX, sizeof(char));
+    initscr();
+    noecho();
+    unsigned int c, i = 0;
+    printw("Enter Password: ");
+    while ((c = (unsigned)getch()) && c != '\n' && i <= PASS_MAX) {
+        if (c != BACKSPACE) {
+            pass[i] = (char) c;
+            i++;
+        } else if (i > 0)
+            pass[i - 1] = '\0';
+    }
+    endwin();
+    return (char*)pass;
+}
+
+void keyExchange(int keySchedule[], int len, const unsigned char* key) {
+    int j = 0;
+    for (int i = 0; i < 256; ++i)
+        keySchedule[i] = i;
+    for (int i = 0; i < 256; ++i) {
+        j = (j + keySchedule[i] + key[i % len]) % 256;
+        int temp = keySchedule[i];
+        keySchedule[i] = keySchedule[j];
+        keySchedule[j] = temp;
+    }
+}
+
+char* prga(int keySchedule[], int len) {
+    int i = 0;
+    int j = 0;
+    char* output = (char*) malloc((size_t)len);
+    for (int k = 0; k < len; ++k) {
+        i = (i + 1) % 256;
+        j = (j + keySchedule[i]) % 256;
+        int temp = keySchedule[i];
+        keySchedule[i] = keySchedule[j];
+        keySchedule[j] = temp;
+        output[k] = (unsigned char) keySchedule[(keySchedule[i] + keySchedule[j]) % 256];
+    }
+    return output;
+}
+
+void rc4(const unsigned char output[], const unsigned char message[], FILE* out, long int len) {
+    for (int i = 0; i < len; ++i)
+        fprintf(out, "%c", output[i] ^ message[i]);
+    printf("\n");
+}
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