[PATCH] sha: fix compatibility with old OpenSSL + Net::SSLeay

[Eric Wong <e@80x24.org>]

In older OpenSSL, EVP_get_digestbyname() didn't work properly
without calling OpenSSL_add_all_digests(), first.  However,
OpenSSL_add_all_digests() is deprecated by OpenSSL 1.1.0 in
favor of OPENSSL_init_crypto().  Of course, OpenSSL_init_crypto()
isn't available in OpenSSL 1.0.1k nor Net::SSLeay as of 1.93_02
(2023-02-22).

Thus, instead of relying on string lookups and conditional
subroutine calls, just call EVP_sha1() and EVP_sha256() which
work on both old and new systems.

Tested with Net::SSLeay 1.55 and OpenSSL 1.0.1k on on CentOS 7.x
---
 lib/PublicInbox/SHA.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/SHA.pm b/lib/PublicInbox/SHA.pm
index da70beef..81f62618 100644
--- a/lib/PublicInbox/SHA.pm
+++ b/lib/PublicInbox/SHA.pm
@@ -20,8 +20,8 @@ BEGIN {
 	unless (eval(<<'EOM')) {
 use Net::SSLeay 1.43;
 my %SHA = (
-	1 => Net::SSLeay::EVP_get_digestbyname('sha1'),
-	256 => Net::SSLeay::EVP_get_digestbyname('sha256'),
+	1 => Net::SSLeay::EVP_sha1(),
+	256 => Net::SSLeay::EVP_sha256(),
 );
 
 sub new {