Added HMAC_MD5 hashing

md5/Makefile → hashing/Makefile

@@ -1,14 +1,13 @@
 CC=gcc
 DEPS = global.h md5.h
-OBJ = md5c.o mddriver.o 
+OBJ = md5c.o mddriver.o hmac.o main.o
 
 %.o: %.c $(DEPS)
 	$(CC) -c -g -o $@ $< $(CFLAGS)
 
-md5: $(OBJ)
+hash: $(OBJ)
 	$(CC) -o $@ $^ $(CFLAGS)
-	rm *.o
 
 clean:
-#	rm *.o
-	rm md5
+	rm *.o
+	rm hash

md5/global.h → hashing/global.h

@@ -6,6 +6,9 @@
  * been defined with C compiler flags.
  */
 
+#ifndef _GLOBAL_H_
+#define _GLOBAL_H_
+
 #ifndef PROTOTYPES
 #define PROTOTYPES 0
 #endif
@@ -29,3 +32,7 @@ typedef unsigned long int UINT4;
 #else
 #define PROTO_LIST(list) ()
 #endif
+
+int main_md5();
+int main_hmac();
+#endif // _GLOBAL_H_

hashing/hmac.c

@@ -0,0 +1,89 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include "md5.h"
+
+void hexdump(void *data, size_t size)
+{ unsigned char *byteData = (unsigned char *)data; for (size_t i = 0; i < size; i++) { printf("%02x ", byteData[i]); if ((i + 1) % 16 == 0) printf("\n"); } printf("\n"); }
+
+/// @brief the implementation of HMAC-MD5 as well as some corresponding test vectors
+/// @param text  pointer to data stream
+/// @param text_len length of data stream
+/// @param key pointer to authentication key
+/// @param key_len length of authentication key
+/// @param digest aller digest to be filled in
+
+void hmac_md5(unsigned char *text, int text_len, unsigned char *key, int key_len, void *digest)
+{
+    MD5_CTX context;
+    unsigned char k_ipad[65]; /* inner padding - key XORd with ipad*/
+    unsigned char k_opad[65]; /* outer padding - key XORd with opad*/
+
+    unsigned char tk[16];
+    int i;
+    /* if key is longer than 64 bytes reset it to key=MD5(key) */
+    if (key_len > 64)
+    {
+        MD5_CTX tctx;
+        MD5Init(&tctx);
+        MD5Update(&tctx, key, key_len);
+        MD5Final(tk, &tctx);
+
+        key = tk;
+        key_len = 16;
+    }
+    /* the HMAC_MD5 tansform look like
+     * MD5 (K XOR opad, MD5(K XOR ipad, text))
+     * where K is an n byte key
+     * ipad is the byte 0x36 repeated 64 times
+     * opad is the byte 0x5c repeated 64 times
+     * and text is the data being protected.
+     */
+
+    /* start out by storing key in pads*/
+    bzero(k_ipad, sizeof k_ipad);
+    bzero(k_opad, sizeof k_opad);
+    bcopy(key, k_ipad, key_len);
+    bcopy(key, k_opad, key_len);
+
+    /* XOR key with ipad and opad values*/
+    for (i = 0; i < 64; i++)
+    {
+        k_ipad[i] ^= 0x36;
+        k_opad[i] ^= 0x5c;
+    }
+
+    /* perform inner MD5 */
+    MD5Init(&context);                   /* init context for 1st
+                                          * pass */
+    MD5Update(&context, k_ipad, 64);     /* start with inner pad */
+    MD5Update(&context, text, text_len); /* then text of datagram */
+    MD5Final(digest, &context);          /* finish up 1st pass */
+    /*
+     * perform outer MD5
+     */
+    MD5Init(&context);               /* init context for 2nd pass */
+    MD5Update(&context, k_opad, 64); /* start with outer pad */
+    MD5Update(&context, digest, 16); /* then results of 1st hash */
+    MD5Final(digest, &context);      /* finish up 2nd pass */
+}
+
+int main_hmac(int argc, char *argv[])
+{
+    unsigned char key[255];
+    unsigned char data[255];
+    unsigned char digest[255];
+
+    memset(key, 0 , sizeof(key));
+    memset(data, 0, sizeof(data));
+    memset(digest, 0, sizeof(digest));
+
+    printf("Enter data: ");
+    scanf("%s", key);
+    printf("\nEnter key: ");
+    scanf("%s", data);
+
+    hmac_md5(data, strlen(data), key, strlen(key), digest);
+    hexdump(digest, sizeof(digest));
+    return 0;
+}

md5/md5.h → hashing/md5.h

@@ -1,11 +1,17 @@
+#include <stdint.h>
+
+#if PROTOTYPES
+#define PROTO_LIST(list) list
+#else
+#define PROTO_LIST(list) ()
+#endif
+
 typedef struct {
-  UINT4 state[4];
-  UINT4 count[2];
+  uint8_t state[4];
+  uint8_t count[2];
   unsigned char buffer[64];
 }MD5_CTX;
 
-void MD5Init PROTO_LIST((MAD5_CTX *));
+void MD5Init PROTO_LIST((MD5_CTX *));
 void MD5Update PROTO_LIST ((MD5_CTX *, unsigned char *, unsigned int));
 void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *));
-
-

md5/md5c.c → hashing/md5c.c

@@ -1,3 +1,4 @@
+#include <stdint.h>
 #include "global.h"
 #include "md5.h"
 

md5/mddriver.c → hashing/mddriver.c

@@ -34,7 +34,7 @@ void help()
        *   \n");
 }
 
-int main(argc, argv)
+int main_md5(argc, argv)
   int argc;
   char *argv[];
 {
@@ -51,8 +51,7 @@ int main(argc, argv)
        MDFile(argv[i]);
    }
   }else{
-    help();
-     MDFilter();
+    help();    
   }
   return 0;
 }