feat: add gmssl headers

include/gmssl/hkdf.h

@@ -0,0 +1,45 @@
+/*
+ *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+// RFC 5869
+
+#ifndef GMSSL_HKDF_H
+#define GMSSL_HKDF_H
+
+#include <string.h>
+#include <gmssl/digest.h>
+#include <gmssl/hmac.h>
+
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+
+int hkdf_extract(const DIGEST *digest, const uint8_t *salt, size_t saltlen,
+	const uint8_t *ikm, size_t ikmlen,
+	uint8_t *prk, size_t *prklen);
+
+int hkdf_expand(const DIGEST *digest, const uint8_t *prk, size_t prklen,
+	const uint8_t *opt_info, size_t opt_infolen,
+	size_t L, uint8_t *okm);
+
+int sm3_hkdf_extract(const uint8_t *salt, size_t saltlen,
+	const uint8_t *ikm, size_t ikmlen,
+	uint8_t *prk, size_t *prklen);
+
+int sm3_hkdf_expand(const uint8_t *prk, size_t prklen,
+	const uint8_t *opt_info, size_t opt_infolen,
+	size_t L, uint8_t *okm);
+
+
+#ifdef  __cplusplus
+}
+#endif
+#endif