diff --git a/sys/include/crypto/aes.h b/sys/include/crypto/aes.h
index 0a1b9b820f726ebad749776ef008ce787d2cd06d..959321cac119207b33d83b4fd8ab5c6ffc6857a0 100644
--- a/sys/include/crypto/aes.h
+++ b/sys/include/crypto/aes.h
@@ -41,11 +41,11 @@ typedef uint8_t u8;
 /* This controls loop-unrolling in aes_core.c */
 #undef FULL_UNROLL
 # define GETU32(pt) (((u32)(pt)[0] << 24) ^ ((u32)(pt)[1] << 16) ^ \
-                             ((u32)(pt)[2] <<  8) ^ ((u32)(pt)[3]))
+                     ((u32)(pt)[2] <<  8) ^ ((u32)(pt)[3]))
 # define PUTU32(ct, st) { (ct)[0] = (u8)((st) >> 24); \
-                              (ct)[1] = (u8)((st) >> 16); \
-                              (ct)[2] = (u8)((st) >>  8); \
-                              (ct)[3] = (u8)(st); }
+                          (ct)[1] = (u8)((st) >> 16); \
+                          (ct)[2] = (u8)((st) >>  8); \
+                          (ct)[3] = (u8)(st); }
 
 #define AES_MAXNR         14
 #define AES_BLOCK_SIZE    16
diff --git a/sys/include/crypto/chacha.h b/sys/include/crypto/chacha.h
index 5e01aa6339613e9d754deccc97009ff9dfd29bd2..ca89cc79ff4a10aff155d229482794952e4a5910 100644
--- a/sys/include/crypto/chacha.h
+++ b/sys/include/crypto/chacha.h
@@ -45,10 +45,9 @@ extern "C" {
  * @brief A ChaCha cipher stream context.
  * @details Initialize with chacha_init().
  */
-typedef struct
-{
+typedef struct {
     uint32_t state[16]; /**< The current state of the stream. */
-    uint8_t rounds; /**< Number of iterations. */
+    uint8_t rounds;     /**< Number of iterations. */
 } chacha_ctx;
 
 /**
diff --git a/sys/include/crypto/ciphers.h b/sys/include/crypto/ciphers.h
index 5eb99a33d504d2312a1a0d65797d609b146d88c0..ea0ce1c0968a5302f93d19b9e961c50919a21352 100644
--- a/sys/include/crypto/ciphers.h
+++ b/sys/include/crypto/ciphers.h
@@ -53,7 +53,7 @@ extern "C" {
 #elif defined(CRYPTO_AES)
     #define CIPHER_MAX_CONTEXT_SIZE CIPHERS_MAX_KEY_SIZE
 #else
-    // 0 is not a possibility because 0-sized arrays are not allowed in ISO C
+/* 0 is not a possibility because 0-sized arrays are not allowed in ISO C */
     #define CIPHER_MAX_CONTEXT_SIZE 1
 #endif
 
@@ -87,15 +87,15 @@ typedef struct cipher_interface_st {
     uint8_t max_key_size;
 
     /** the init function */
-    int (*init)(cipher_context_t* ctx, const uint8_t* key, uint8_t key_size);
+    int (*init)(cipher_context_t *ctx, const uint8_t *key, uint8_t key_size);
 
     /** the encrypt function */
-    int (*encrypt)(const cipher_context_t* ctx, const uint8_t* plain_block,
-                   uint8_t* cipher_block);
+    int (*encrypt)(const cipher_context_t *ctx, const uint8_t *plain_block,
+                   uint8_t *cipher_block);
 
     /** the decrypt function */
-    int (*decrypt)(const cipher_context_t* ctx, const uint8_t* cipher_block,
-                   uint8_t* plain_block);
+    int (*decrypt)(const cipher_context_t *ctx, const uint8_t *cipher_block,
+                   uint8_t *plain_block);
 } cipher_interface_t;
 
 
@@ -109,10 +109,10 @@ extern const cipher_id_t CIPHER_AES_128;
  *        contains the cipher interface and the context
  */
 typedef struct {
-    const cipher_interface_t* interface; /**< BlockCipher-Interface for the
-                                              Cipher-Algorithms */
-    cipher_context_t context;            /**< The encryption context (buffer)
-                                              for the algorithm */
+    const cipher_interface_t *interface;    /**< BlockCipher-Interface for the
+                                                 Cipher-Algorithms */
+    cipher_context_t context;               /**< The encryption context (buffer)
+                                                 for the algorithm */
 } cipher_t;
 
 
@@ -128,7 +128,7 @@ typedef struct {
  *          The command may be unsuccessful if the key size is not valid.
  *          CIPHER_ERR_BAD_CONTEXT_SIZE if CIPHER_MAX_CONTEXT_SIZE has not been defined (which means that the cipher has not been included in the build)
  */
-int cipher_init(cipher_t* cipher, cipher_id_t cipher_id, const uint8_t* key,
+int cipher_init(cipher_t *cipher, cipher_id_t cipher_id, const uint8_t *key,
                 uint8_t key_size);
 
 
@@ -141,7 +141,7 @@ int cipher_init(cipher_t* cipher, cipher_id_t cipher_id, const uint8_t* key,
  * @param output     pointer to allocated memory for encrypted data. It has to
  *                   be of size BLOCK_SIZE
  */
-int cipher_encrypt(const cipher_t* cipher, const uint8_t* input, uint8_t* output);
+int cipher_encrypt(const cipher_t *cipher, const uint8_t *input, uint8_t *output);
 
 
 /**
@@ -153,7 +153,7 @@ int cipher_encrypt(const cipher_t* cipher, const uint8_t* input, uint8_t* output
  * @param output     pointer to allocated memory for decrypted data. It has to
  *                   be of size BLOCK_SIZE
  */
-int cipher_decrypt(const cipher_t* cipher, const uint8_t* input, uint8_t* output);
+int cipher_decrypt(const cipher_t *cipher, const uint8_t *input, uint8_t *output);
 
 
 /**
@@ -162,7 +162,7 @@ int cipher_decrypt(const cipher_t* cipher, const uint8_t* input, uint8_t* output
  *
  * @param cipher     Already initialized cipher struct
  */
-int cipher_get_block_size(const cipher_t* cipher);
+int cipher_get_block_size(const cipher_t *cipher);
 
 
 #ifdef __cplusplus