From 0c924836cf9ae04cd12e2647e6edd5c0f896ff7b Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Tue, 13 Aug 2024 15:36:13 -0400
Subject: [PATCH] fixed AEAD verification for LibreSSL

---
 libi2pd/Crypto.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libi2pd/Crypto.cpp b/libi2pd/Crypto.cpp
index 960c400c..2f9677c1 100644
--- a/libi2pd/Crypto.cpp
+++ b/libi2pd/Crypto.cpp
@@ -997,6 +997,15 @@ namespace crypto
 		}
 		else
 		{
+#if defined(LIBRESSL_VERSION_NUMBER)
+			std::vector<uint8_t> m(msgLen + 16);
+			if (msg == buf)
+			{	
+				// we have to use different buffers otherwise verification fails
+				memcpy (m.data (), msg, msgLen + 16);
+				msg = m.data ();
+			}	
+#endif			
 			EVP_DecryptInit_ex(ctx, EVP_chacha20_poly1305(), 0, 0, 0);
 			EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, 0);
 			EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, 16, (uint8_t *)(msg + msgLen));