[openssl] OpenSSL_1_1_1-stable update

[Matt Caswell]

The branch OpenSSL_1_1_1-stable has been updated
       via  d251c4ecc11c19628fe86d82b4b4c47cfea97c17 (commit)
      from  d0771a9fdb93bdff992a079f596829139b8b12c0 (commit)


- Log -----------------------------------------------------------------
commit d251c4ecc11c19628fe86d82b4b4c47cfea97c17
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Apr 2 09:58:59 2020 +0100

    Expand the XTS documentation
    
    Explain that XTS does not support streaming, and that the IV value is the
    tweak.
    
    Reviewed-by: Tomas Mraz <tmraz at fedoraproject.org>
    Reviewed-by: Paul Dale <paul.dale at oracle.com>
    (Merged from https://github.com/openssl/openssl/pull/11461)
    
    (cherry picked from commit 70d80ef9898ddbe03841efd2df2f526b71829d7f)

-----------------------------------------------------------------------

Summary of changes:
 doc/man3/EVP_aes.pod | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/man3/EVP_aes.pod b/doc/man3/EVP_aes.pod
index 4192a9ec36..7db48a427f 100644
--- a/doc/man3/EVP_aes.pod
+++ b/doc/man3/EVP_aes.pod
@@ -160,6 +160,13 @@ In particular, XTS-AES-128 (B<EVP_aes_128_xts>) takes input of a 256-bit key to
 achieve AES 128-bit security, and XTS-AES-256 (B<EVP_aes_256_xts>) takes input
 of a 512-bit key to achieve AES 256-bit security.
 
+The XTS implementation in OpenSSL does not support streaming. That is there must
+only be one L<EVP_EncryptUpdate(3)> call per L<EVP_EncryptInit_ex(3)> call (and
+similarly with the "Decrypt" functions).
+
+The I<iv> parameter to L<EVP_EncryptInit_ex(3)> or L<EVP_DecryptInit_ex(3)> is
+the XTS "tweak" value.
+
 =back
 
 =head1 RETURN VALUES