1 files changed, 6 insertions, 0 deletions
diff --git a/protocols/WhatsAppWeb/src/utils.h b/protocols/WhatsAppWeb/src/utils.h
index c05dbd5410..151f3adffd 100644
--- a/protocols/WhatsAppWeb/src/utils.h
+++ b/protocols/WhatsAppWeb/src/utils.h
@@ -104,3 +104,9 @@ public:
 
 std::string encodeBigEndian(uint32_t num, size_t len = sizeof(uint32_t));
 void generateIV(uint8_t *iv, int &pVar);
+
+unsigned char* HKDF(const EVP_MD *evp_md,
+	const unsigned char *salt, size_t salt_len,
+	const unsigned char *key, size_t key_len,
+	const unsigned char *info, size_t info_len,
+	unsigned char *okm, size_t okm_len);