1 files changed, 29 insertions, 0 deletions
diff --git a/libs/libsignal/src/hkdf.h b/libs/libsignal/src/hkdf.h
new file mode 100644
index 0000000000..43ee870401
--- /dev/null
+++ b/libs/libsignal/src/hkdf.h
@@ -0,0 +1,29 @@
+#ifndef HKDF_H
+#define HKDF_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "signal_protocol_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int hkdf_create(hkdf_context **context, int message_version, signal_context *global_context);
+
+ssize_t hkdf_derive_secrets(hkdf_context *context,
+        uint8_t **output,
+        const uint8_t *input_key_material, size_t input_key_material_len,
+        const uint8_t *salt, size_t salt_len,
+        const uint8_t *info, size_t info_len,
+        size_t output_len);
+
+int hkdf_compare(const hkdf_context *context1, const hkdf_context *context2);
+
+void hkdf_destroy(signal_type_base *type);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HKDF_H */