diff -up openssl-1.1.0g/crypto/asn1/a_verify.c.no-md5-verify openssl-1.1.0g/crypto/asn1/a_verify.c

--- openssl-1.1.0g/crypto/asn1/a_verify.c.no-md5-verify	2017-11-02 15:29:02.000000000 +0100

+++ openssl-1.1.0g/crypto/asn1/a_verify.c	2017-11-03 16:15:46.125801341 +0100

@@ -7,6 +7,9 @@

  * https://www.openssl.org/source/license.html

  */

+/* for secure_getenv */

+#define _GNU_SOURCE

+

 #include <stdio.h>

 #include <time.h>

 #include <sys/types.h>

@@ -126,6 +129,12 @@ int ASN1_item_verify(const ASN1_ITEM *it

         if (ret != 2)

             goto err;

         ret = -1;

+    } else if ((mdnid == NID_md5

+               && secure_getenv("OPENSSL_ENABLE_MD5_VERIFY") == NULL) ||

+               mdnid == NID_md4 || mdnid == NID_md2 || mdnid == NID_sha) {

+        ASN1err(ASN1_F_ASN1_ITEM_VERIFY,

+                ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);

+        goto err;

     } else {

         const EVP_MD *type;

         type = EVP_get_digestbynid(mdnid);