diff --git a/tools/benchmark_deep.pl b/tools/benchmark_deep.pl
index 4b6f629fe..a7a2124d0 100755
--- a/tools/benchmark_deep.pl
+++ b/tools/benchmark_deep.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_be_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_be_S.pl
old mode 100644
new mode 100755
index 18867c567..f497021d2
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_be_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_le_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_le_S.pl
old mode 100644
new mode 100755
index 26a73ba5e..16b735557
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_le_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_1x64_le_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_be_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_be_S.pl
old mode 100644
new mode 100755
index 25acf22f0..e73e10cbb
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_be_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_carry_be_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_carry_be_S.pl
old mode 100644
new mode 100755
index cbaa406fe..4e898457f
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_carry_be_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_carry_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_le_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_le_S.pl
old mode 100644
new mode 100755
index 310634f6b..aadb6a2c1
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_le_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_4x4_le_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_be_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_be_S.pl
old mode 100644
new mode 100755
index 404d3eb0e..11e3d22ac
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_be_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_carry_be_S.pl b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_carry_be_S.pl
old mode 100644
new mode 100755
index 931caf5c6..6c059d564
--- a/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_carry_be_S.pl
+++ b/tools/code_generators/GEN_AMD_switch_buffer_by_offset_8x4_carry_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_be_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_be_S.pl
old mode 100644
new mode 100755
index 2719267fd..784dd80a8
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_be_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_le_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_le_S.pl
old mode 100644
new mode 100755
index f8a87f7d5..2b4d40ee7
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_le_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_1x64_le_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_be_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_be_S.pl
old mode 100644
new mode 100755
index c2c95751f..bf4052848
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_be_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_carry_be_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_carry_be_S.pl
old mode 100644
new mode 100755
index 2f1e87497..2993fc697
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_carry_be_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_carry_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_le_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_le_S.pl
old mode 100644
new mode 100755
index 0f0f62809..e1ba4b6e6
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_le_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_4x4_le_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_be_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_be_S.pl
old mode 100644
new mode 100755
index ea67607ab..6f3c0336f
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_be_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_carry_be_S.pl b/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_carry_be_S.pl
old mode 100644
new mode 100755
index 2ac665806..15fd4c1e7
--- a/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_carry_be_S.pl
+++ b/tools/code_generators/GEN_NV_switch_buffer_by_offset_8x4_carry_be_S.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_truncate_block_16x4_be.pl b/tools/code_generators/GEN_truncate_block_16x4_be.pl
old mode 100644
new mode 100755
index 41427e754..59363850b
--- a/tools/code_generators/GEN_truncate_block_16x4_be.pl
+++ b/tools/code_generators/GEN_truncate_block_16x4_be.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_truncate_block_16x4_le.pl b/tools/code_generators/GEN_truncate_block_16x4_le.pl
old mode 100644
new mode 100755
index ce17f8bcc..5c19219f1
--- a/tools/code_generators/GEN_truncate_block_16x4_le.pl
+++ b/tools/code_generators/GEN_truncate_block_16x4_le.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_truncate_block_4x4_be.pl b/tools/code_generators/GEN_truncate_block_4x4_be.pl
old mode 100644
new mode 100755
index e5b017841..c92c32bf1
--- a/tools/code_generators/GEN_truncate_block_4x4_be.pl
+++ b/tools/code_generators/GEN_truncate_block_4x4_be.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/code_generators/GEN_truncate_block_4x4_le.pl b/tools/code_generators/GEN_truncate_block_4x4_le.pl
old mode 100644
new mode 100755
index 292120770..11e1430bf
--- a/tools/code_generators/GEN_truncate_block_4x4_le.pl
+++ b/tools/code_generators/GEN_truncate_block_4x4_le.pl
@@ -1,4 +1,9 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
 
 use strict;
 use warnings;
diff --git a/tools/install_modules.sh b/tools/install_modules.sh
index 804960f82..33d907aeb 100755
--- a/tools/install_modules.sh
+++ b/tools/install_modules.sh
@@ -23,6 +23,7 @@ cpan install Authen::Passphrase::LANManager \
              Crypt::ECB                     \
              Crypt::Eksblowfish::Bcrypt     \
              Crypt::GCrypt                  \
+             Crypt::Mode::CBC               \
              Crypt::Mode::ECB               \
              Crypt::MySQL                   \
              Crypt::OpenSSH::ChachaPoly     \
@@ -50,11 +51,13 @@ cpan install Authen::Passphrase::LANManager \
              Digest::SHA1                   \
              Digest::SHA3                   \
              Digest::SipHash                \
+             Encode                         \
              JSON                           \
              MIME::Base32                   \
              MIME::Base64                   \
              Net::DNS::RR::NSEC3            \
              Net::DNS::SEC                  \
+             POSIX                          \
              Text::Iconv                    \
              ;
 
@@ -66,6 +69,15 @@ pip2 uninstall -y pycryptodome
 
 ERRORS=$((ERRORS+$?))
 
+php --version > /dev/null 2> /dev/null
+
+if [ "$?" -ne 0 ]
+then
+  echo '[ ERROR ] php must be installed for some unit tests'
+
+  ERRORS=$((ERRORS+1))
+fi
+
 echo
 if [ $ERRORS -eq 0 ]; then
   echo '[  OK  ] All commands were successful'
diff --git a/tools/securenotes2hashcat.pl b/tools/securenotes2hashcat.pl
old mode 100644
new mode 100755