1 files changed, 65 insertions, 0 deletions
diff --git a/libressl/include/openssl/hkdf.h b/libressl/include/openssl/hkdf.h
new file mode 100644
index 0000000..34450f9
--- /dev/null
+++ b/libressl/include/openssl/hkdf.h
@@ -0,0 +1,65 @@
+/* $OpenBSD: hkdf.h,v 1.2 2018/04/03 13:33:53 tb Exp $ */
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or 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. */
+
+#ifndef OPENSSL_HEADER_HKDF_H
+#define OPENSSL_HEADER_HKDF_H
+
+#include <openssl/evp.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/*
+ * HKDF computes HKDF (as specified by RFC 5869) of initial keying
+ * material |secret| with |salt| and |info| using |digest|, and
+ * outputs |out_len| bytes to |out_key|. It returns one on success and
+ * zero on error.
+ *
+ * HKDF is an Extract-and-Expand algorithm. It does not do any key
+ * stretching, and as such, is not suited to be used alone to generate
+ * a key from a password.
+ */
+
+int HKDF(uint8_t *out_key, size_t out_len, const struct env_md_st *digest,
+    const uint8_t *secret, size_t secret_len, const uint8_t *salt,
+    size_t salt_len, const uint8_t *info, size_t info_len);
+
+/*
+ * HKDF_extract computes a HKDF PRK (as specified by RFC 5869) from
+ * initial keying material |secret| and salt |salt| using |digest|,
+ * and outputs |out_len| bytes to |out_key|. The maximum output size
+ * is |EVP_MAX_MD_SIZE|.  It returns one on success and zero on error.
+ */
+int HKDF_extract(uint8_t *out_key, size_t *out_len,
+    const struct env_md_st *digest, const uint8_t *secret,
+    size_t secret_len, const uint8_t *salt, size_t salt_len);
+
+/*
+ * HKDF_expand computes a HKDF OKM (as specified by RFC 5869) of
+ * length |out_len| from the PRK |prk| and info |info| using |digest|,
+ * and outputs the result to |out_key|. It returns one on success and
+ * zero on error.
+ */
+int HKDF_expand(uint8_t *out_key, size_t out_len,
+    const EVP_MD *digest, const uint8_t *prk, size_t prk_len,
+    const uint8_t *info,  size_t info_len);
+
+
+#if defined(__cplusplus)
+}  /* extern C */
+#endif
+
+#endif  /* OPENSSL_HEADER_HKDF_H */