diff --git a/src/netif/ppp/md5.c b/src/netif/ppp/md5.c
index c582faf9..d65ecedb 100644
--- a/src/netif/ppp/md5.c
+++ b/src/netif/ppp/md5.c
@@ -100,24 +100,24 @@ static unsigned char PADDING[64] = {
   }
 
 #ifdef __STDC__
-#define UL(x)	x##UL
+#define UL(x) x##UL
 #else
 #ifdef WIN32
-#define UL(x)	x##UL
+#define UL(x) x##UL
 #else
-#define UL(x)	x
+#define UL(x) x
 #endif
 #endif
 
 /* The routine MD5Init initializes the message-digest context
    mdContext. All fields are set to zero.
  */
-void MD5Init (MD5_CTX *mdContext)
+void
+MD5Init (MD5_CTX *mdContext)
 {
   mdContext->i[0] = mdContext->i[1] = (u32_t)0;
 
-  /* Load magic initialization constants.
-   */
+  /* Load magic initialization constants. */
   mdContext->buf[0] = (u32_t)0x67452301UL;
   mdContext->buf[1] = (u32_t)0xefcdab89UL;
   mdContext->buf[2] = (u32_t)0x98badcfeUL;
@@ -128,7 +128,8 @@ void MD5Init (MD5_CTX *mdContext)
    account for the presence of each of the characters inBuf[0..inLen-1]
    in the message whose digest is being computed.
  */
-void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
+void
+MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
 {
   u32_t in[16];
   int mdi;
@@ -143,8 +144,9 @@ void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 
   /* update number of bits */
-  if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0])
+  if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
     mdContext->i[1]++;
+  }
   mdContext->i[0] += ((u32_t)inLen << 3);
   mdContext->i[1] += ((u32_t)inLen >> 29);
 
@@ -154,11 +156,12 @@ void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
 
     /* transform if necessary */
     if (mdi == 0x40) {
-      for (i = 0, ii = 0; i < 16; i++, ii += 4)
+      for (i = 0, ii = 0; i < 16; i++, ii += 4) {
         in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
                 (((u32_t)mdContext->in[ii+2]) << 16) |
-				(((u32_t)mdContext->in[ii+1]) << 8) |
+                (((u32_t)mdContext->in[ii+1]) << 8)  |
                 ((u32_t)mdContext->in[ii]);
+      }
       Transform (mdContext->buf, in);
       mdi = 0;
     }
@@ -168,7 +171,8 @@ void MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
 /* The routine MD5Final terminates the message-digest computation and
    ends with the desired message digest in mdContext->digest[0...15].
  */
-void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
+void
+MD5Final (unsigned char hash[], MD5_CTX *mdContext)
 {
   u32_t in[16];
   int mdi;
@@ -187,18 +191,19 @@ void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
   MD5Update (mdContext, PADDING, padLen);
 
   /* append length in bits and transform */
-  for (i = 0, ii = 0; i < 14; i++, ii += 4)
+  for (i = 0, ii = 0; i < 14; i++, ii += 4) {
     in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
             (((u32_t)mdContext->in[ii+2]) << 16) |
-            (((u32_t)mdContext->in[ii+1]) << 8) |
+            (((u32_t)mdContext->in[ii+1]) << 8)  |
             ((u32_t)mdContext->in[ii]);
+  }
   Transform (mdContext->buf, in);
 
   /* store buffer in digest */
   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
-    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
-	mdContext->digest[ii+1] =
-      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
+    mdContext->digest[ii]   = (unsigned char)(mdContext->buf[i] & 0xFF);
+    mdContext->digest[ii+1] =
+      (unsigned char)((mdContext->buf[i] >> 8)  & 0xFF);
     mdContext->digest[ii+2] =
       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
     mdContext->digest[ii+3] =
@@ -209,7 +214,8 @@ void MD5Final (unsigned char hash[], MD5_CTX *mdContext)
 
 /* Basic MD5 step. Transforms buf based on in.
  */
-static void Transform (u32_t *buf, u32_t *in)
+static void
+Transform (u32_t *buf, u32_t *in)
 {
   u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 
diff --git a/src/netif/ppp/md5.h b/src/netif/ppp/md5.h
index 0e81cdc3..e129533f 100644
--- a/src/netif/ppp/md5.h
+++ b/src/netif/ppp/md5.h
@@ -42,14 +42,14 @@
 
 /* Data structure for MD5 (Message-Digest) computation */
 typedef struct {
-  u32_t i[2];                   /* number of _bits_ handled mod 2^64 */
-  u32_t buf[4];                                    /* scratch buffer */
-  unsigned char in[64];                              /* input buffer */
-  unsigned char digest[16];     /* actual digest after MD5Final call */
+  u32_t i[2];               /* number of _bits_ handled mod 2^64 */
+  u32_t buf[4];             /* scratch buffer */
+  unsigned char in[64];     /* input buffer */
+  unsigned char digest[16]; /* actual digest after MD5Final call */
 } MD5_CTX;
 
-void MD5Init (MD5_CTX *mdContext);
-void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen);
-void MD5Final (unsigned char hash[], MD5_CTX *mdContext);
+void MD5Init  ( MD5_CTX *mdContext);
+void MD5Update( MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen);
+void MD5Final ( unsigned char hash[], MD5_CTX *mdContext);
 
 #endif /* MD5_H */