pkey, ssl: use EVP_PKEY_eq() instead of EVP_PKEY_cmp()

OpenSSL 3.0 renamed EVP_PKEY_cmp() to EVP_PKEY_eq() because that was a
confusing name.

Author: rhenium

ext/openssl/extconf.rb

@@ -178,6 +178,7 @@ def find_openssl_library
 have_func("BN_check_prime")
 have_func("EVP_MD_CTX_get0_md")
 have_func("EVP_MD_CTX_get_pkey_ctx")
+have_func("EVP_PKEY_eq")
 
 Logging::message "=== Checking done. ===\n"
 

ext/openssl/openssl_missing.h

@@ -231,4 +231,8 @@ IMPL_PKEY_GETTER(EC_KEY, ec)
 # endif
 #endif
 
+#ifndef HAVE_EVP_PKEY_EQ
+#  define EVP_PKEY_eq(a, b) EVP_PKEY_cmp(a, b)
+#endif
+
 #endif /* _OSSL_OPENSSL_MISSING_H_ */

ext/openssl/ossl_pkey.c

@@ -769,14 +769,14 @@ ossl_pkey_compare(VALUE self, VALUE other)
     if (EVP_PKEY_id(selfPKey) != EVP_PKEY_id(otherPKey))
         ossl_raise(rb_eTypeError, "cannot match different PKey types");
 
-    ret = EVP_PKEY_cmp(selfPKey, otherPKey);
+    ret = EVP_PKEY_eq(selfPKey, otherPKey);
 
     if (ret == 0)
         return Qfalse;
     else if (ret == 1)
         return Qtrue;
     else
-        ossl_raise(ePKeyError, "EVP_PKEY_cmp");
+        ossl_raise(ePKeyError, "EVP_PKEY_eq");
 }
 
 /*

ext/openssl/ossl_ssl.c

@@ -1229,7 +1229,7 @@ ossl_sslctx_add_certificate(int argc, VALUE *argv, VALUE self)
     EVP_PKEY_free(pub_pkey);
     if (!pub_pkey)
 	rb_raise(rb_eArgError, "certificate does not contain public key");
-    if (EVP_PKEY_cmp(pub_pkey, pkey) != 1)
+    if (EVP_PKEY_eq(pub_pkey, pkey) != 1)
 	rb_raise(rb_eArgError, "public key mismatch");
 
     if (argc >= 3)