diff --git a/library/hkdf.c b/library/hkdf.c
index 6c7082b..48143fa 100644
--- a/library/hkdf.c
+++ b/library/hkdf.c
@@ -20,52 +20,55 @@
 
 #if defined(MBEDTLS_HKDF_C)
 
-#include <string.h>
-#include "mbedtls/hkdf.h"
-#include "mbedtls/platform_util.h"
-#include "mbedtls/error.h"
+#    include <string.h>
+#    include "mbedtls/hkdf.h"
+#    include "mbedtls/platform_util.h"
+#    include "mbedtls/error.h"
 
-int mbedtls_hkdf( const mbedtls_md_info_t *md, const unsigned char *salt,
-                  size_t salt_len, const unsigned char *ikm, size_t ikm_len,
-                  const unsigned char *info, size_t info_len,
-                  unsigned char *okm, size_t okm_len )
+int mbedtls_hkdf(const mbedtls_md_info_t *md,
+                 const unsigned char *salt,
+                 size_t salt_len,
+                 const unsigned char *ikm,
+                 size_t ikm_len,
+                 const unsigned char *info,
+                 size_t info_len,
+                 unsigned char *okm,
+                 size_t okm_len)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char prk[MBEDTLS_MD_MAX_SIZE];
 
-    ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, prk );
+    ret = mbedtls_hkdf_extract(md, salt, salt_len, ikm, ikm_len, prk);
 
-    if( ret == 0 )
-    {
-        ret = mbedtls_hkdf_expand( md, prk, mbedtls_md_get_size( md ),
-                                   info, info_len, okm, okm_len );
+    if (ret == 0) {
+        ret = mbedtls_hkdf_expand(md, prk, mbedtls_md_get_size(md), info,
+                                  info_len, okm, okm_len);
     }
 
-    mbedtls_platform_zeroize( prk, sizeof( prk ) );
+    mbedtls_platform_zeroize(prk, sizeof(prk));
 
-    return ret ;
+    return ret;
 }
 
-int mbedtls_hkdf_extract( const mbedtls_md_info_t *md,
-                          const unsigned char *salt, size_t salt_len,
-                          const unsigned char *ikm, size_t ikm_len,
-                          unsigned char *prk )
+int mbedtls_hkdf_extract(const mbedtls_md_info_t *md,
+                         const unsigned char *salt,
+                         size_t salt_len,
+                         const unsigned char *ikm,
+                         size_t ikm_len,
+                         unsigned char *prk)
 {
     unsigned char null_salt[MBEDTLS_MD_MAX_SIZE] = { '\0' };
 
-    if( salt == NULL )
-    {
+    if (salt == NULL) {
         size_t hash_len;
 
-        if( salt_len != 0 )
-        {
+        if (salt_len != 0) {
             return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
         }
 
-        hash_len = mbedtls_md_get_size( md );
+        hash_len = mbedtls_md_get_size(md);
 
-        if( hash_len == 0 )
-        {
+        if (hash_len == 0) {
             return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
         }
 
@@ -73,12 +76,16 @@
         salt_len = hash_len;
     }
 
-    return mbedtls_md_hmac( md, salt, salt_len, ikm, ikm_len, prk ) ;
+    return mbedtls_md_hmac(md, salt, salt_len, ikm, ikm_len, prk);
 }
 
-int mbedtls_hkdf_expand( const mbedtls_md_info_t *md, const unsigned char *prk,
-                         size_t prk_len, const unsigned char *info,
-                         size_t info_len, unsigned char *okm, size_t okm_len )
+int mbedtls_hkdf_expand(const mbedtls_md_info_t *md,
+                        const unsigned char *prk,
+                        size_t prk_len,
+                        const unsigned char *info,
+                        size_t info_len,
+                        unsigned char *okm,
+                        size_t okm_len)
 {
     size_t hash_len;
     size_t where = 0;
@@ -89,28 +96,24 @@
     mbedtls_md_context_t ctx;
     unsigned char t[MBEDTLS_MD_MAX_SIZE];
 
-    if( okm == NULL )
-    {
-        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ;
+    if (okm == NULL) {
+        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
     }
 
-    hash_len = mbedtls_md_get_size( md );
+    hash_len = mbedtls_md_get_size(md);
 
-    if( prk_len < hash_len || hash_len == 0 )
-    {
-        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ;
+    if (prk_len < hash_len || hash_len == 0) {
+        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
     }
 
-    if( info == NULL )
-    {
-        info = (const unsigned char *) "";
+    if (info == NULL) {
+        info = (const unsigned char *)"";
         info_len = 0;
     }
 
     n = okm_len / hash_len;
 
-    if( okm_len % hash_len != 0 )
-    {
+    if (okm_len % hash_len != 0) {
         n++;
     }
 
@@ -118,72 +121,64 @@
      * Per RFC 5869 Section 2.3, okm_len must not exceed
      * 255 times the hash length
      */
-    if( n > 255 )
-    {
-        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ;
+    if (n > 255) {
+        return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
     }
 
-    mbedtls_md_init( &ctx );
+    mbedtls_md_init(&ctx);
 
-    if( ( ret = mbedtls_md_setup( &ctx, md, 1 ) ) != 0 )
-    {
+    if ((ret = mbedtls_md_setup(&ctx, md, 1)) != 0) {
         goto exit;
     }
 
-    memset( t, 0, hash_len );
+    memset(t, 0, hash_len);
 
     /*
      * Compute T = T(1) | T(2) | T(3) | ... | T(N)
      * Where T(N) is defined in RFC 5869 Section 2.3
      */
-    for( i = 1; i <= n; i++ )
-    {
+    for (i = 1; i <= n; i++) {
         size_t num_to_copy;
         unsigned char c = i & 0xff;
 
-        ret = mbedtls_md_hmac_starts( &ctx, prk, prk_len );
-        if( ret != 0 )
-        {
+        ret = mbedtls_md_hmac_starts(&ctx, prk, prk_len);
+        if (ret != 0) {
             goto exit;
         }
 
-        ret = mbedtls_md_hmac_update( &ctx, t, t_len );
-        if( ret != 0 )
-        {
+        ret = mbedtls_md_hmac_update(&ctx, t, t_len);
+        if (ret != 0) {
             goto exit;
         }
 
-        ret = mbedtls_md_hmac_update( &ctx, info, info_len );
-        if( ret != 0 )
-        {
+        ret = mbedtls_md_hmac_update(&ctx, info, info_len);
+        if (ret != 0) {
             goto exit;
         }
 
         /* The constant concatenated to the end of each T(n) is a single octet.
          * */
-        ret = mbedtls_md_hmac_update( &ctx, &c, 1 );
-        if( ret != 0 )
-        {
+        ret = mbedtls_md_hmac_update(&ctx, &c, 1);
+        if (ret != 0) {
             goto exit;
         }
 
-        ret = mbedtls_md_hmac_finish( &ctx, t );
-        if( ret != 0 )
-        {
+        ret = mbedtls_md_hmac_finish(&ctx, t);
+        if (ret != 0) {
             goto exit;
         }
 
         num_to_copy = i != n ? hash_len : okm_len - where;
-        memcpy( okm + where, t, num_to_copy );
+        memcpy(okm + where, t, num_to_copy);
         where += hash_len;
         t_len = hash_len;
     }
 
 exit:
-    mbedtls_md_free( &ctx );
-    mbedtls_platform_zeroize( t, sizeof( t ) );
+    mbedtls_md_free(&ctx);
+    mbedtls_platform_zeroize(t, sizeof(t));
 
-    return ret ;
+    return ret;
 }
 
 #endif /* MBEDTLS_HKDF_C */