diff --git a/library/ssl_cookie.c b/library/ssl_cookie.c
index f12f28e..1ac9c41 100644
--- a/library/ssl_cookie.c
+++ b/library/ssl_cookie.c
@@ -60,105 +60,108 @@
  * Cookies are formed of a 4-bytes timestamp (or serial number) and
  * an HMAC of timestamp and client ID.
  */
-#define COOKIE_LEN      ( 4 + COOKIE_HMAC_LEN )
+#define COOKIE_LEN      (4 + COOKIE_HMAC_LEN)
 
-void mbedtls_ssl_cookie_init( mbedtls_ssl_cookie_ctx *ctx )
+void mbedtls_ssl_cookie_init(mbedtls_ssl_cookie_ctx *ctx)
 {
-    mbedtls_md_init( &ctx->hmac_ctx );
+    mbedtls_md_init(&ctx->hmac_ctx);
 #if !defined(MBEDTLS_HAVE_TIME)
     ctx->serial = 0;
 #endif
     ctx->timeout = MBEDTLS_SSL_COOKIE_TIMEOUT;
 
 #if defined(MBEDTLS_THREADING_C)
-    mbedtls_mutex_init( &ctx->mutex );
+    mbedtls_mutex_init(&ctx->mutex);
 #endif
 }
 
-void mbedtls_ssl_cookie_set_timeout( mbedtls_ssl_cookie_ctx *ctx, unsigned long delay )
+void mbedtls_ssl_cookie_set_timeout(mbedtls_ssl_cookie_ctx *ctx, unsigned long delay)
 {
     ctx->timeout = delay;
 }
 
-void mbedtls_ssl_cookie_free( mbedtls_ssl_cookie_ctx *ctx )
+void mbedtls_ssl_cookie_free(mbedtls_ssl_cookie_ctx *ctx)
 {
-    mbedtls_md_free( &ctx->hmac_ctx );
+    mbedtls_md_free(&ctx->hmac_ctx);
 
 #if defined(MBEDTLS_THREADING_C)
-    mbedtls_mutex_free( &ctx->mutex );
+    mbedtls_mutex_free(&ctx->mutex);
 #endif
 
-    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ssl_cookie_ctx ) );
+    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_ssl_cookie_ctx));
 }
 
-int mbedtls_ssl_cookie_setup( mbedtls_ssl_cookie_ctx *ctx,
-                      int (*f_rng)(void *, unsigned char *, size_t),
-                      void *p_rng )
+int mbedtls_ssl_cookie_setup(mbedtls_ssl_cookie_ctx *ctx,
+                             int (*f_rng)(void *, unsigned char *, size_t),
+                             void *p_rng)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char key[COOKIE_MD_OUTLEN];
 
-    if( ( ret = f_rng( p_rng, key, sizeof( key ) ) ) != 0 )
-        return( ret );
+    if ((ret = f_rng(p_rng, key, sizeof(key))) != 0) {
+        return ret;
+    }
 
-    ret = mbedtls_md_setup( &ctx->hmac_ctx, mbedtls_md_info_from_type( COOKIE_MD ), 1 );
-    if( ret != 0 )
-        return( ret );
+    ret = mbedtls_md_setup(&ctx->hmac_ctx, mbedtls_md_info_from_type(COOKIE_MD), 1);
+    if (ret != 0) {
+        return ret;
+    }
 
-    ret = mbedtls_md_hmac_starts( &ctx->hmac_ctx, key, sizeof( key ) );
-    if( ret != 0 )
-        return( ret );
+    ret = mbedtls_md_hmac_starts(&ctx->hmac_ctx, key, sizeof(key));
+    if (ret != 0) {
+        return ret;
+    }
 
-    mbedtls_platform_zeroize( key, sizeof( key ) );
+    mbedtls_platform_zeroize(key, sizeof(key));
 
-    return( 0 );
+    return 0;
 }
 
 /*
  * Generate the HMAC part of a cookie
  */
 MBEDTLS_CHECK_RETURN_CRITICAL
-static int ssl_cookie_hmac( mbedtls_md_context_t *hmac_ctx,
-                            const unsigned char time[4],
-                            unsigned char **p, unsigned char *end,
-                            const unsigned char *cli_id, size_t cli_id_len )
+static int ssl_cookie_hmac(mbedtls_md_context_t *hmac_ctx,
+                           const unsigned char time[4],
+                           unsigned char **p, unsigned char *end,
+                           const unsigned char *cli_id, size_t cli_id_len)
 {
     unsigned char hmac_out[COOKIE_MD_OUTLEN];
 
-    MBEDTLS_SSL_CHK_BUF_PTR( *p, end, COOKIE_HMAC_LEN );
+    MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_HMAC_LEN);
 
-    if( mbedtls_md_hmac_reset(  hmac_ctx ) != 0 ||
-        mbedtls_md_hmac_update( hmac_ctx, time, 4 ) != 0 ||
-        mbedtls_md_hmac_update( hmac_ctx, cli_id, cli_id_len ) != 0 ||
-        mbedtls_md_hmac_finish( hmac_ctx, hmac_out ) != 0 )
-    {
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+    if (mbedtls_md_hmac_reset(hmac_ctx) != 0 ||
+        mbedtls_md_hmac_update(hmac_ctx, time, 4) != 0 ||
+        mbedtls_md_hmac_update(hmac_ctx, cli_id, cli_id_len) != 0 ||
+        mbedtls_md_hmac_finish(hmac_ctx, hmac_out) != 0) {
+        return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
     }
 
-    memcpy( *p, hmac_out, COOKIE_HMAC_LEN );
+    memcpy(*p, hmac_out, COOKIE_HMAC_LEN);
     *p += COOKIE_HMAC_LEN;
 
-    return( 0 );
+    return 0;
 }
 
 /*
  * Generate cookie for DTLS ClientHello verification
  */
-int mbedtls_ssl_cookie_write( void *p_ctx,
-                      unsigned char **p, unsigned char *end,
-                      const unsigned char *cli_id, size_t cli_id_len )
+int mbedtls_ssl_cookie_write(void *p_ctx,
+                             unsigned char **p, unsigned char *end,
+                             const unsigned char *cli_id, size_t cli_id_len)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
     unsigned long t;
 
-    if( ctx == NULL || cli_id == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+    if (ctx == NULL || cli_id == NULL) {
+        return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
+    }
 
-    MBEDTLS_SSL_CHK_BUF_PTR( *p, end, COOKIE_LEN );
+    MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_LEN);
 
 #if defined(MBEDTLS_HAVE_TIME)
-    t = (unsigned long) mbedtls_time( NULL );
+    t = (unsigned long) mbedtls_time(NULL);
 #else
     t = ctx->serial++;
 #endif
@@ -167,28 +170,30 @@
     *p += 4;
 
 #if defined(MBEDTLS_THREADING_C)
-    if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
-        return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret ) );
+    if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
+    }
 #endif
 
-    ret = ssl_cookie_hmac( &ctx->hmac_ctx, *p - 4,
-                           p, end, cli_id, cli_id_len );
+    ret = ssl_cookie_hmac(&ctx->hmac_ctx, *p - 4,
+                          p, end, cli_id, cli_id_len);
 
 #if defined(MBEDTLS_THREADING_C)
-    if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
-        return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR,
-                MBEDTLS_ERR_THREADING_MUTEX_ERROR ) );
+    if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
+                                 MBEDTLS_ERR_THREADING_MUTEX_ERROR);
+    }
 #endif
 
-    return( ret );
+    return ret;
 }
 
 /*
  * Check a cookie
  */
-int mbedtls_ssl_cookie_check( void *p_ctx,
-                      const unsigned char *cookie, size_t cookie_len,
-                      const unsigned char *cli_id, size_t cli_id_len )
+int mbedtls_ssl_cookie_check(void *p_ctx,
+                             const unsigned char *cookie, size_t cookie_len,
+                             const unsigned char *cli_id, size_t cli_id_len)
 {
     unsigned char ref_hmac[COOKIE_HMAC_LEN];
     int ret = 0;
@@ -196,58 +201,60 @@
     mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
     unsigned long cur_time, cookie_time;
 
-    if( ctx == NULL || cli_id == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+    if (ctx == NULL || cli_id == NULL) {
+        return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
+    }
 
-    if( cookie_len != COOKIE_LEN )
-        return( -1 );
+    if (cookie_len != COOKIE_LEN) {
+        return -1;
+    }
 
 #if defined(MBEDTLS_THREADING_C)
-    if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
-        return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret ) );
-#endif
-
-    if( ssl_cookie_hmac( &ctx->hmac_ctx, cookie,
-                         &p, p + sizeof( ref_hmac ),
-                         cli_id, cli_id_len ) != 0 )
-        ret = -1;
-
-#if defined(MBEDTLS_THREADING_C)
-    if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
-    {
-        ret = MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR,
-                                 MBEDTLS_ERR_THREADING_MUTEX_ERROR );
+    if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
     }
 #endif
 
-    if( ret != 0 )
-        goto exit;
+    if (ssl_cookie_hmac(&ctx->hmac_ctx, cookie,
+                        &p, p + sizeof(ref_hmac),
+                        cli_id, cli_id_len) != 0) {
+        ret = -1;
+    }
 
-    if( mbedtls_ct_memcmp( cookie + 4, ref_hmac, sizeof( ref_hmac ) ) != 0 )
-    {
+#if defined(MBEDTLS_THREADING_C)
+    if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
+        ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
+                                MBEDTLS_ERR_THREADING_MUTEX_ERROR);
+    }
+#endif
+
+    if (ret != 0) {
+        goto exit;
+    }
+
+    if (mbedtls_ct_memcmp(cookie + 4, ref_hmac, sizeof(ref_hmac)) != 0) {
         ret = -1;
         goto exit;
     }
 
 #if defined(MBEDTLS_HAVE_TIME)
-    cur_time = (unsigned long) mbedtls_time( NULL );
+    cur_time = (unsigned long) mbedtls_time(NULL);
 #else
     cur_time = ctx->serial;
 #endif
 
-    cookie_time = ( (unsigned long) cookie[0] << 24 ) |
-                  ( (unsigned long) cookie[1] << 16 ) |
-                  ( (unsigned long) cookie[2] <<  8 ) |
-                  ( (unsigned long) cookie[3]       );
+    cookie_time = ((unsigned long) cookie[0] << 24) |
+                  ((unsigned long) cookie[1] << 16) |
+                  ((unsigned long) cookie[2] <<  8) |
+                  ((unsigned long) cookie[3]);
 
-    if( ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout )
-    {
+    if (ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout) {
         ret = -1;
         goto exit;
     }
 
 exit:
-    mbedtls_platform_zeroize( ref_hmac, sizeof( ref_hmac ) );
-    return( ret );
+    mbedtls_platform_zeroize(ref_hmac, sizeof(ref_hmac));
+    return ret;
 }
 #endif /* MBEDTLS_SSL_COOKIE_C */