From 74fd6dc6c3ba65e48c625d4724878721c46a5e6f Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Tue, 24 Aug 2021 15:04:13 -0400
Subject: [PATCH] crypto: Handle EVP changes in OpenSSL 3
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OpenSSL 3 changes the padding behavior of EVP_DecryptFinal_ex(), which
causes our decryption to fail.  It is the opnion of the OpenSSL
developers that mod_auth_gssapi's use of this function was incorrect.

Patch suggested by Tomáš Mráz.

Related: https://github.com/openssl/openssl/issues/16351

Signed-off-by: Robbie Harwood <rharwood@redhat.com>
(cherry picked from commit 06d1f7d36d2455747e6e8231d28e6524ea1181f1)
(cherry picked from commit 915a3d7fca3beefadd751562abe2d481354a2a9c)
---
 src/crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/crypto.c b/src/crypto.c
index 3f372a0..b3f7fd9 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -262,7 +262,7 @@ apr_status_t UNSEAL_BUFFER(apr_pool_t *p, struct seal_key *skey,
 
     totlen += outlen;
     outlen = plain->length - totlen;
-    ret = EVP_DecryptFinal_ex(ctx, plain->value, &outlen);
+    ret = EVP_DecryptFinal_ex(ctx, plain->value + totlen, &outlen);
     if (ret == 0) goto done;
 
     totlen += outlen;