openssl: avoid d2i_ASN1_BOOLEAN()

* ext/openssl/ossl_asn1.c (decode_bool): Do the same thing as
  d2i_ASN1_BOOLEAN() does by ourselves. This function is removed in
  OpenSSL 1.1.0.
  [ruby-core:75225] [Feature #12324]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55288 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 6 deletions

diff --git a/ext/openssl/ossl_asn1.c b/ext/openssl/ossl_asn1.c
index 51f0475424..03822b5c26 100644
--- a/ext/openssl/ossl_asn1.c
+++ b/ext/openssl/ossl_asn1.c
@@ -357,14 +357,15 @@ obj_to_asn1derstr(VALUE obj)
 static VALUE
 decode_bool(unsigned char* der, long length)
 {
-    int val;
-    const unsigned char *p;
+    const unsigned char *p = der;
 
-    p = der;
-    if((val = d2i_ASN1_BOOLEAN(NULL, &p, length)) < 0)
-	ossl_raise(eASN1Error, NULL);
+    assert(length == 3);
+    if (*p++ != 1)
+	ossl_raise(eASN1Error, "not a boolean");
+    if (*p++ != 1)
+	ossl_raise(eASN1Error, "length is not 1");
 
-    return val ? Qtrue : Qfalse;
+    return *p ? Qtrue : Qfalse;
 }
 
 static VALUE