From 5aaf78cff650bc2f2ac48bfa75bcc6d003baf650 Mon Sep 17 00:00:00 2001
From: David Cooper <dcooper16@gmail.com>
Date: Tue, 21 Feb 2017 15:22:47 -0500
Subject: [PATCH] Fix issue #643

It seems that the head command on OS X does not accept a negative number as a value for the "-n" parameter. This PR provides an alternative method for removing the "generator:  " line without using "head."
---
 testssl.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testssl.sh b/testssl.sh
index bfcb5dc..b57664d 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -10218,7 +10218,7 @@ run_logjam() {
 
      # now the final test for common primes
      if [[ -n "$key_bitstring" ]]; then
-          dh_p="$($OPENSSL pkey -pubin -text -noout <<< "$key_bitstring" | awk '/prime:/,/generator:/' | tail -n +2 | head -n -1)"
+          dh_p="$($OPENSSL pkey -pubin -text -noout <<< "$key_bitstring" | awk '/prime:/,/generator:/' | tail -n +2 | sed -e 's/generator: .*//')"
           dh_p="$(strip_spaces "$(colon_to_spaces "$(newline_to_spaces "$dh_p")")")"
           [[ "${dh_p:0:2}" == "00" ]] && dh_p="${dh_p:2}"
           len_dh_p="$((4*${#dh_p}))"