diff --git a/hash_sha224_sha256.c b/hash_sha224_sha256.c
index c4da1b6..7fe36b0 100644
--- a/hash_sha224_sha256.c
+++ b/hash_sha224_sha256.c
@@ -18,9 +18,7 @@
 
 #include "lilcrypto.h"
 #include "hash.h"
-#include "hash_sha224_sha256.h"
 #include "impl_sha256.h"
-
 #include "util.h"
 
 
@@ -55,7 +53,7 @@
 #define SHA256_H0_7	UINT32_C(0x5be0cd19)
 
 
-int
+static int
 sha224_init(void *arg)
 {
 	struct sha256_ctx	*ctx = arg;
@@ -79,7 +77,7 @@ sha224_init(void *arg)
 	return 1;
 }
 
-int
+static int
 sha256_init(void *arg)
 {
 	struct sha256_ctx	*ctx = arg;
@@ -143,13 +141,13 @@ sha224_sha256_update(void *arg, const uint8_t *in, size_t inlen)
 	return 1;
 }
 
-int
+static int
 sha224_update(void *arg, const uint8_t *in, size_t inlen)
 {
 	return sha224_sha256_update(arg, in, inlen);
 }
 
-int
+static int
 sha256_update(void *arg, const uint8_t *in, size_t inlen)
 {
 	return sha224_sha256_update(arg, in, inlen);
@@ -176,7 +174,7 @@ sha224_sha256_final(struct sha256_ctx *ctx)
 	sha256_block(ctx);
 }
 
-int
+static int
 sha224_final(void *arg, uint8_t *out, size_t *outlen)
 {
 	struct sha256_ctx	*ctx = arg;
@@ -199,7 +197,7 @@ sha224_final(void *arg, uint8_t *out, size_t *outlen)
 	return 1;
 }
 
-int
+static int
 sha256_final(void *arg, uint8_t *out, size_t *outlen)
 {
 	struct sha256_ctx	*ctx = arg;
diff --git a/hash_sha224_sha256.h b/hash_sha224_sha256.h
deleted file mode 100644
index 57ac424..0000000
--- a/hash_sha224_sha256.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <stddef.h>
-#include <stdint.h>
-
-
-int	sha224_init(void *);
-int	sha224_update(void *, const uint8_t *, size_t);
-int	sha224_final(void *, uint8_t *, size_t *);
-
-int	sha256_init(void *);
-int	sha256_update(void *, const uint8_t *, size_t);
-int	sha256_final(void *, uint8_t *, size_t *);
diff --git a/hash_sha384_sha512.c b/hash_sha384_sha512.c
index e8e7467..274b756 100644
--- a/hash_sha384_sha512.c
+++ b/hash_sha384_sha512.c
@@ -18,9 +18,7 @@
 
 #include "lilcrypto.h"
 #include "hash.h"
-#include "hash_sha384_sha512.h"
 #include "impl_sha512.h"
-
 #include "util.h"
 
 
@@ -56,7 +54,7 @@
 #define SHA512_H0_7	UINT64_C(0x5be0cd19137e2179)
 
 
-int
+static int
 sha384_init(void *arg)
 {
 	struct sha512_ctx	*ctx = arg;
@@ -80,7 +78,7 @@ sha384_init(void *arg)
 	return 1;
 }
 
-int
+static int
 sha512_init(void *arg)
 {
 	struct sha512_ctx	*ctx = arg;
@@ -148,13 +146,13 @@ sha384_sha512_update(void *arg, const uint8_t *in, size_t inlen)
 	return 1;
 }
 
-int
+static int
 sha384_update(void *arg, const uint8_t *in, size_t inlen)
 {
 	return sha384_sha512_update(arg, in, inlen);
 }
 
-int
+static int
 sha512_update(void *arg, const uint8_t *in, size_t inlen)
 {
 	return sha384_sha512_update(arg, in, inlen);
@@ -182,7 +180,7 @@ sha384_sha512_final(struct sha512_ctx *ctx)
 	sha512_block(ctx);
 }
 
-int
+static int
 sha384_final(void *arg, uint8_t *out, size_t *outlen)
 {
 	struct sha512_ctx	*ctx = arg;
@@ -204,7 +202,7 @@ sha384_final(void *arg, uint8_t *out, size_t *outlen)
 	return 1;
 }
 
-int
+static int
 sha512_final(void *arg, uint8_t *out, size_t *outlen)
 {
 	struct sha512_ctx	*ctx = arg;
diff --git a/hash_sha384_sha512.h b/hash_sha384_sha512.h
deleted file mode 100644
index bc27323..0000000
--- a/hash_sha384_sha512.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <stddef.h>
-#include <stdint.h>
-
-
-int	sha384_init(void *);
-int	sha384_update(void *, const uint8_t *, size_t);
-int	sha384_final(void *, uint8_t *, size_t *);
-
-int	sha512_init(void *);
-int	sha512_update(void *, const uint8_t *, size_t);
-int	sha512_final(void *, uint8_t *, size_t *);