···
+
From https://github.com/openbsd/ports/blob/master/net/p5-Net-SNMP/patches/patch-lib_Net_SNMP_Security_USM_pm
+
Tests for the additional algorithms have also been added.
+
diff --git a/MANIFEST b/MANIFEST
+
index 3430564..d3dd7f0 100644
+
@@ -40,3 +40,7 @@ t/usm-sha1-3des.t
+
diff --git a/lib/Net/SNMP/Security/USM.pm b/lib/Net/SNMP/Security/USM.pm
+
index a76ef56..0bcd52c 100644
+
--- a/lib/Net/SNMP/Security/USM.pm
+
+++ b/lib/Net/SNMP/Security/USM.pm
+
@@ -26,8 +26,9 @@ use Net::SNMP::Message qw(
+
-use Digest::HMAC_MD5();
+
-use Digest::HMAC_SHA1();
+
+use Digest::SHA qw( hmac_sha1 hmac_sha224 hmac_sha256 hmac_sha384 hmac_sha512 );
+
+use Digest::HMAC_MD5 qw ( hmac_md5 );
+
## Version of the Net::SNMP::Security::USM module
+
@@ -41,7 +42,9 @@ our @EXPORT_OK;
+
- qw( AUTH_PROTOCOL_NONE AUTH_PROTOCOL_HMACMD5 AUTH_PROTOCOL_HMACSHA )
+
+ qw( AUTH_PROTOCOL_NONE AUTH_PROTOCOL_HMACMD5 AUTH_PROTOCOL_HMACSHA
+
+ AUTH_PROTOCOL_HMACSHA224 AUTH_PROTOCOL_HMACSHA256
+
+ AUTH_PROTOCOL_HMACSHA384 AUTH_PROTOCOL_HMACSHA512 )
+
qw( SECURITY_LEVEL_NOAUTHNOPRIV SECURITY_LEVEL_AUTHNOPRIV
+
@@ -64,9 +67,13 @@ $EXPORT_TAGS{ALL} = [ @EXPORT_OK ];
+
## RCC 3414 - Authentication protocols
+
-sub AUTH_PROTOCOL_NONE { '1.3.6.1.6.3.10.1.1.1' } # usmNoAuthProtocol
+
-sub AUTH_PROTOCOL_HMACMD5 { '1.3.6.1.6.3.10.1.1.2' } # usmHMACMD5AuthProtocol
+
-sub AUTH_PROTOCOL_HMACSHA { '1.3.6.1.6.3.10.1.1.3' } # usmHMACSHAAuthProtocol
+
+sub AUTH_PROTOCOL_NONE { '1.3.6.1.6.3.10.1.1.1' } # usmNoAuthProtocol
+
+sub AUTH_PROTOCOL_HMACMD5 { '1.3.6.1.6.3.10.1.1.2' } # usmHMACMD5AuthProtocol
+
+sub AUTH_PROTOCOL_HMACSHA { '1.3.6.1.6.3.10.1.1.3' } # usmHMACSHAAuthProtocol
+
+sub AUTH_PROTOCOL_HMACSHA224 { '1.3.6.1.6.3.10.1.1.4' } # usmHMAC128SHA224AuthProtocol
+
+sub AUTH_PROTOCOL_HMACSHA256 { '1.3.6.1.6.3.10.1.1.5' } # usmHMAC192SHA256AuthProtocol
+
+sub AUTH_PROTOCOL_HMACSHA384 { '1.3.6.1.6.3.10.1.1.6' } # usmHMAC256SHA384AuthProtocol
+
+sub AUTH_PROTOCOL_HMACSHA512 { '1.3.6.1.6.3.10.1.1.7' } # usmHMAC384SHA512AuthProtocol
+
## RFC 3414 - Privacy protocols
+
@@ -125,6 +132,7 @@ sub new
+
'_time_epoc' => time(), # snmpEngineBoots epoc
+
'_user_name' => q{}, # securityName
+
'_auth_data' => undef, # Authentication data
+
+ '_auth_maclen' => undef, # MAC length
+
'_auth_key' => undef, # authKey
+
'_auth_password' => undef, # Authentication password
+
'_auth_protocol' => AUTH_PROTOCOL_HMACMD5, # authProtocol
+
@@ -281,10 +289,10 @@ sub generate_request_msg
+
if ($pdu->security_level() > SECURITY_LEVEL_NOAUTHNOPRIV) {
+
# Save the location to fill in msgAuthenticationParameters later
+
- $auth_location = $msg->length() + 12 + length $pdu_buffer;
+
+ $auth_location = $msg->length() + $this->{_auth_maclen} + length $pdu_buffer;
+
# Set the msgAuthenticationParameters to all zeros
+
- $auth_params = pack 'x12';
+
+ $auth_params = pack "x$this->{_auth_maclen}";
+
if (!defined $msg->prepare(OCTET_STRING, $auth_params)) {
+
@@ -419,12 +427,12 @@ sub process_incoming_msg
+
# to compute the HMAC properly.
+
if (my $len = length $auth_params) {
+
+ if ($len != $this->{_auth_maclen}) {
+
'The msgAuthenticationParameters length of %d is invalid', $len
+
- substr ${$msg->reference}, ($msg->index() - 12), 12, pack 'x12';
+
+ substr ${$msg->reference}, ($msg->index() - $this->{_auth_maclen}), $this->{_auth_maclen}, pack "x$this->{_auth_maclen}";
+
# msgPrivacyParameters::=OCTET STRING
+
@@ -748,6 +756,18 @@ sub _auth_password
+
quotemeta AUTH_PROTOCOL_HMACMD5, AUTH_PROTOCOL_HMACMD5,
+
'(?:hmac-)?sha(?:-?1|-96)?', AUTH_PROTOCOL_HMACSHA,
+
quotemeta AUTH_PROTOCOL_HMACSHA, AUTH_PROTOCOL_HMACSHA,
+
+ '(?:hmac-)?sha(?:-?224)', AUTH_PROTOCOL_HMACSHA224,
+
+ 'usmHMAC128SHA224AuthProtocol', AUTH_PROTOCOL_HMACSHA224,
+
+ quotemeta AUTH_PROTOCOL_HMACSHA224,AUTH_PROTOCOL_HMACSHA224,
+
+ '(?:hmac-)?sha(?:-?256)', AUTH_PROTOCOL_HMACSHA256,
+
+ 'usmHMAC192SHA256AuthProtocol', AUTH_PROTOCOL_HMACSHA256,
+
+ quotemeta AUTH_PROTOCOL_HMACSHA256,AUTH_PROTOCOL_HMACSHA256,
+
+ '(?:hmac-)?sha(?:-?384)', AUTH_PROTOCOL_HMACSHA384,
+
+ 'usmHMAC256SHA384AuthProtocol', AUTH_PROTOCOL_HMACSHA384,
+
+ quotemeta AUTH_PROTOCOL_HMACSHA384,AUTH_PROTOCOL_HMACSHA384,
+
+ '(?:hmac-)?sha(?:-?512)', AUTH_PROTOCOL_HMACSHA512,
+
+ 'usmHMAC384SHA512AuthProtocol', AUTH_PROTOCOL_HMACSHA512,
+
+ quotemeta AUTH_PROTOCOL_HMACSHA512,AUTH_PROTOCOL_HMACSHA512,
+
@@ -1100,7 +1120,7 @@ sub _authenticate_outgoing_msg
+
# Set the msgAuthenticationParameters
+
- substr ${$msg->reference}, -$auth_location, 12, $this->_auth_hmac($msg);
+
+ substr ${$msg->reference}, -$auth_location, $this->{_auth_maclen}, $this->_auth_hmac($msg);
+
@@ -1126,7 +1146,7 @@ sub _auth_hmac
+
return q{} if (!defined($this->{_auth_data}) || !defined $msg);
+
- $this->{_auth_data}->reset()->add(${$msg->reference()})->digest(), 0, 12;
+
+ $this->{_auth_data}(${$msg->reference()}, $this->{_auth_key}), 0, $this->{_auth_maclen};
+
@@ -1141,16 +1161,35 @@ sub _auth_data_init
+
if ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACMD5) {
+
- $this->{_auth_data} =
+
- Digest::HMAC_MD5->new($this->{_auth_key});
+
+ $this->{_auth_data} = \&hmac_md5;
+
+ $this->{_auth_maclen} = 12;
+
} elsif ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACSHA) {
+
- $this->{_auth_data} =
+
- Digest::HMAC_SHA1->new($this->{_auth_key});
+
+ $this->{_auth_data} = \&hmac_sha1;
+
+ $this->{_auth_maclen} = 12;
+
+ } elsif ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACSHA224) {
+
+ $this->{_auth_data} = \&hmac_sha224;
+
+ $this->{_auth_maclen} = 16;
+
+ } elsif ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACSHA256) {
+
+ $this->{_auth_data} = \&hmac_sha256;
+
+ $this->{_auth_maclen} = 24;
+
+ } elsif ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACSHA384) {
+
+ $this->{_auth_data} = \&hmac_sha384;
+
+ $this->{_auth_maclen} = 32;
+
+ } elsif ($this->{_auth_protocol} eq AUTH_PROTOCOL_HMACSHA512) {
+
+ $this->{_auth_data} = \&hmac_sha512;
+
+ $this->{_auth_maclen} = 48;
+
'The authProtocol "%s" is unknown', $this->{_auth_protocol}
+
@@ -1628,6 +1667,10 @@ sub _auth_key_validate
+
AUTH_PROTOCOL_HMACMD5, [ 16, 'HMAC-MD5' ],
+
AUTH_PROTOCOL_HMACSHA, [ 20, 'HMAC-SHA1' ],
+
+ AUTH_PROTOCOL_HMACSHA224, [ 28, 'HMAC-SHA224' ],
+
+ AUTH_PROTOCOL_HMACSHA256, [ 32, 'HMAC-SHA256' ],
+
+ AUTH_PROTOCOL_HMACSHA384, [ 48, 'HMAC-SHA384' ],
+
+ AUTH_PROTOCOL_HMACSHA512, [ 64, 'HMAC-SHA512' ],
+
if (!exists $key_len->{$this->{_auth_protocol}}) {
+
@@ -1783,8 +1826,12 @@ sub _password_localize
+
- AUTH_PROTOCOL_HMACMD5, 'Digest::MD5',
+
- AUTH_PROTOCOL_HMACSHA, 'Digest::SHA',
+
+ AUTH_PROTOCOL_HMACMD5, ['Digest::MD5', ],
+
+ AUTH_PROTOCOL_HMACSHA, ['Digest::SHA', 1],
+
+ AUTH_PROTOCOL_HMACSHA224, ['Digest::SHA', 224],
+
+ AUTH_PROTOCOL_HMACSHA256, ['Digest::SHA', 256],
+
+ AUTH_PROTOCOL_HMACSHA384, ['Digest::SHA', 384],
+
+ AUTH_PROTOCOL_HMACSHA512, ['Digest::SHA', 512],
+
if (!exists $digests->{$this->{_auth_protocol}}) {
+
@@ -1793,7 +1840,12 @@ sub _password_localize
+
- my $digest = $digests->{$this->{_auth_protocol}}->new;
+
+ if (!defined($digests->{$this->{_auth_protocol}}[1])) {
+
+ $digest = $digests->{$this->{_auth_protocol}}[0]->new;
+
+ $digest = $digests->{$this->{_auth_protocol}}[0]->new($digests->{$this->{_auth_protocol}}[1]);
+
# Create the initial digest using the password
+
diff --git a/t/usm-sha224-aes.t b/t/usm-sha224-aes.t
+
+++ b/t/usm-sha224-aes.t
+
+# ============================================================================
+
+# Test of the SNMPv3 User-based Security Model.
+
+# Copyright (c) 2001-2009 David M. Town <dtown@cpan.org>.
+
+# Copyright (c) 2024 Michal Josef Špaček <skim@cpan.org>.
+
+# All rights reserved.
+
+# This program is free software; you may redistribute it and/or modify it
+
+# under the same terms as the Perl 5 programming language system itself.
+
+# ============================================================================
+
+use Net::SNMP::Message qw(SEQUENCE OCTET_STRING FALSE);
+
+# Load the Net::SNMP::Security::USM module
+
+eval 'use Net::SNMP::Security::USM; use Crypt::Rijndael;';
+
+my $skip = ($@ =~ /locate (:?\S+\.pm)/) ? $@ : FALSE;
+
+# 1. Create the Net::SNMP::Security::USM object
+
+ ($u, $e) = Net::SNMP::Security::USM->new(
+
+ -username => 'dtown',
+
+ -authpassword => 'maplesyrup',
+
+ -authprotocol => 'sha224',
+
+ -privpassword => 'maplesyrup',
+
+ -privprotocol => 'aes',
+
+ # "Perform" discovery...
+
+ $u->_engine_id_discovery(pack 'x11H2', '02');
+
+ # ...and synchronization
+
+ $u->_synchronize(10, time);
+
+ $skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Security::USM object'
+
+# 2. Check the localized authKey
+
+ $e = unpack 'H*', $u->auth_key();
+
+ '0bd8827c6e29f8065e08e09237f177e410f69b90e1782be682075674',
+
+ 'Invalid authKey calculated'
+
+# 3. Check the localized privKey
+
+ $e = unpack 'H*', $u->priv_key();
+
+ '0bd8827c6e29f8065e08e09237f177e4',
+
+ 'Invalid privKey calculated'
+
+# 4. Create and initialize a Message
+
+ ($m, $e) = Net::SNMP::Message->new();
+
+ $m->prepare(SEQUENCE, pack('H*', 'deadbeef') x 8);
+
+skip($skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Message object');
+
+# 5. Calculate the HMAC
+
+ $h = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, $@, q{}, 'Calculate the HMAC failed');
+
+# 6. Encrypt/descrypt the Message
+
+ my $engine_boots = 0;
+
+ my $engine_time = 1710186219;
+
+ my $len = $m->length();
+
+ my $buff = $m->clear();
+
+ $u->{_engine_boots} = $engine_boots;
+
+ $u->{_engine_time} = $engine_time;
+
+ my $encrypted = $u->_encrypt_data($m, $salt, $buff);
+
+ $henc = unpack 'H*', $encrypted;
+
+ $m->append($encrypted);
+
+ substr $salt, 0, 0, pack 'NN', $engine_boots, $engine_time;
+
+ $u->_decrypt_data($m, $salt, $m->process(OCTET_STRING));
+
+ # Remove padding if necessary
+
+ if ($len -= $m->length()) {
+
+ substr ${$m->reference()}, $len, -$len, q{};
+
+ '042228c5467793ab001f4be546de4b990f90998b09d43f2baaffb52a5d36457cef3b5ab7',
+
+ $h2 = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, ($@ || $h2), $h, 'Authentication failed');
+
+# ============================================================================
+
diff --git a/t/usm-sha256-aes.t b/t/usm-sha256-aes.t
+
+++ b/t/usm-sha256-aes.t
+
+# ============================================================================
+
+# Test of the SNMPv3 User-based Security Model.
+
+# Copyright (c) 2001-2009 David M. Town <dtown@cpan.org>.
+
+# Copyright (c) 2024 Michal Josef Špaček <skim@cpan.org>.
+
+# All rights reserved.
+
+# This program is free software; you may redistribute it and/or modify it
+
+# under the same terms as the Perl 5 programming language system itself.
+
+# ============================================================================
+
+use Net::SNMP::Message qw(SEQUENCE OCTET_STRING FALSE);
+
+# Load the Net::SNMP::Security::USM module
+
+eval 'use Net::SNMP::Security::USM; use Crypt::Rijndael;';
+
+my $skip = ($@ =~ /locate (:?\S+\.pm)/) ? $@ : FALSE;
+
+# 1. Create the Net::SNMP::Security::USM object
+
+ ($u, $e) = Net::SNMP::Security::USM->new(
+
+ -username => 'dtown',
+
+ -authpassword => 'maplesyrup',
+
+ -authprotocol => 'sha256',
+
+ -privpassword => 'maplesyrup',
+
+ -privprotocol => 'aes',
+
+ # "Perform" discovery...
+
+ $u->_engine_id_discovery(pack 'x11H2', '02');
+
+ # ...and synchronization
+
+ $u->_synchronize(10, time);
+
+ $skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Security::USM object'
+
+# 2. Check the localized authKey
+
+ $e = unpack 'H*', $u->auth_key();
+
+ '8982e0e549e866db361a6b625d84cccc11162d453ee8ce3a6445c2d6776f0f8b',
+
+ 'Invalid authKey calculated'
+
+# 3. Check the localized privKey
+
+ $e = unpack 'H*', $u->priv_key();
+
+ '8982e0e549e866db361a6b625d84cccc',
+
+ 'Invalid privKey calculated'
+
+# 4. Create and initialize a Message
+
+ ($m, $e) = Net::SNMP::Message->new();
+
+ $m->prepare(SEQUENCE, pack('H*', 'deadbeef') x 8);
+
+skip($skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Message object');
+
+# 5. Calculate the HMAC
+
+ $h = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, $@, q{}, 'Calculate the HMAC failed');
+
+# 6. Encrypt/descrypt the Message
+
+ my $engine_boots = 0;
+
+ my $engine_time = 1710186219;
+
+ my $len = $m->length();
+
+ my $buff = $m->clear();
+
+ $u->{_engine_boots} = $engine_boots;
+
+ $u->{_engine_time} = $engine_time;
+
+ my $encrypted = $u->_encrypt_data($m, $salt, $buff);
+
+ $henc = unpack 'H*', $encrypted;
+
+ $m->append($encrypted);
+
+ substr $salt, 0, 0, pack 'NN', $engine_boots, $engine_time;
+
+ $u->_decrypt_data($m, $salt, $m->process(OCTET_STRING));
+
+ # Remove padding if necessary
+
+ if ($len -= $m->length()) {
+
+ substr ${$m->reference()}, $len, -$len, q{};
+
+ '0422863d06faf464369a298b66062e54374ba3b4a0f862162d25ba72130038f8befc9e21',
+
+ $h2 = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, ($@ || $h2), $h, 'Authentication failed');
+
+# ============================================================================
+
diff --git a/t/usm-sha384-aes.t b/t/usm-sha384-aes.t
+
+++ b/t/usm-sha384-aes.t
+
+# ============================================================================
+
+# Test of the SNMPv3 User-based Security Model.
+
+# Copyright (c) 2001-2009 David M. Town <dtown@cpan.org>.
+
+# Copyright (c) 2024 Michal Josef Špaček <skim@cpan.org>.
+
+# All rights reserved.
+
+# This program is free software; you may redistribute it and/or modify it
+
+# under the same terms as the Perl 5 programming language system itself.
+
+# ============================================================================
+
+use Net::SNMP::Message qw(SEQUENCE OCTET_STRING FALSE);
+
+# Load the Net::SNMP::Security::USM module
+
+eval 'use Net::SNMP::Security::USM; use Crypt::Rijndael;';
+
+my $skip = ($@ =~ /locate (:?\S+\.pm)/) ? $@ : FALSE;
+
+# 1. Create the Net::SNMP::Security::USM object
+
+ ($u, $e) = Net::SNMP::Security::USM->new(
+
+ -username => 'dtown',
+
+ -authpassword => 'maplesyrup',
+
+ -authprotocol => 'sha384',
+
+ -privpassword => 'maplesyrup',
+
+ -privprotocol => 'aes',
+
+ # "Perform" discovery...
+
+ $u->_engine_id_discovery(pack 'x11H2', '02');
+
+ # ...and synchronization
+
+ $u->_synchronize(10, time);
+
+ $skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Security::USM object'
+
+# 2. Check the localized authKey
+
+ $e = unpack 'H*', $u->auth_key();
+
+ '3b298f16164a11184279d5432bf169e2d2a48307de02b3d3f7e2b4f36eb6f0455a53689a3937eea07319a633d2ccba78',
+
+ 'Invalid authKey calculated'
+
+# 3. Check the localized privKey
+
+ $e = unpack 'H*', $u->priv_key();
+
+ '3b298f16164a11184279d5432bf169e2',
+
+ 'Invalid privKey calculated'
+
+# 4. Create and initialize a Message
+
+ ($m, $e) = Net::SNMP::Message->new();
+
+ $m->prepare(SEQUENCE, pack('H*', 'deadbeef') x 8);
+
+skip($skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Message object');
+
+# 5. Calculate the HMAC
+
+ $h = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, $@, q{}, 'Calculate the HMAC failed');
+
+# 6. Encrypt/descrypt the Message
+
+ my $engine_boots = 0;
+
+ my $engine_time = 1710186219;
+
+ my $len = $m->length();
+
+ my $buff = $m->clear();
+
+ $u->{_engine_boots} = $engine_boots;
+
+ $u->{_engine_time} = $engine_time;
+
+ my $encrypted = $u->_encrypt_data($m, $salt, $buff);
+
+ $henc = unpack 'H*', $encrypted;
+
+ $m->append($encrypted);
+
+ substr $salt, 0, 0, pack 'NN', $engine_boots, $engine_time;
+
+ $u->_decrypt_data($m, $salt, $m->process(OCTET_STRING));
+
+ # Remove padding if necessary
+
+ if ($len -= $m->length()) {
+
+ substr ${$m->reference()}, $len, -$len, q{};
+
+ '0422850967bbff81be49aefadf9b6ee3eedb9093609fcfc813a21bdf09b469965923bfc0',
+
+ $h2 = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, ($@ || $h2), $h, 'Authentication failed');
+
+# ============================================================================
+
diff --git a/t/usm-sha512-aes.t b/t/usm-sha512-aes.t
+
+++ b/t/usm-sha512-aes.t
+
+# ============================================================================
+
+# Test of the SNMPv3 User-based Security Model.
+
+# Copyright (c) 2001-2009 David M. Town <dtown@cpan.org>.
+
+# Copyright (c) 2024 Michal Josef Špaček <skim@cpan.org>.
+
+# All rights reserved.
+
+# This program is free software; you may redistribute it and/or modify it
+
+# under the same terms as the Perl 5 programming language system itself.
+
+# ============================================================================
+
+use Net::SNMP::Message qw(SEQUENCE OCTET_STRING FALSE);
+
+# Load the Net::SNMP::Security::USM module
+
+eval 'use Net::SNMP::Security::USM; use Crypt::Rijndael;';
+
+my $skip = ($@ =~ /locate (:?\S+\.pm)/) ? $@ : FALSE;
+
+# 1. Create the Net::SNMP::Security::USM object
+
+ ($u, $e) = Net::SNMP::Security::USM->new(
+
+ -username => 'dtown',
+
+ -authpassword => 'maplesyrup',
+
+ -authprotocol => 'sha512',
+
+ -privpassword => 'maplesyrup',
+
+ -privprotocol => 'aes',
+
+ # "Perform" discovery...
+
+ $u->_engine_id_discovery(pack 'x11H2', '02');
+
+ # ...and synchronization
+
+ $u->_synchronize(10, time);
+
+ $skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Security::USM object'
+
+# 2. Check the localized authKey
+
+ $e = unpack 'H*', $u->auth_key();
+
+ '22a5a36cedfcc085807a128d7bc6c2382167ad6c0dbc5fdff856740f3d84c099ad1ea87a8db096714d9788bd544047c9021e4229ce27e4c0a69250adfcffbb0b',
+
+ 'Invalid authKey calculated'
+
+# 3. Check the localized privKey
+
+ $e = unpack 'H*', $u->priv_key();
+
+ '22a5a36cedfcc085807a128d7bc6c238',
+
+ 'Invalid privKey calculated'
+
+# 4. Create and initialize a Message
+
+ ($m, $e) = Net::SNMP::Message->new();
+
+ $m->prepare(SEQUENCE, pack('H*', 'deadbeef') x 8);
+
+skip($skip, ($@ || $e), q{}, 'Failed to create Net::SNMP::Message object');
+
+# 5. Calculate the HMAC
+
+ $h = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, $@, q{}, 'Calculate the HMAC failed');
+
+# 6. Encrypt/descrypt the Message
+
+ my $engine_boots = 0;
+
+ my $engine_time = 1710186219;
+
+ my $len = $m->length();
+
+ my $buff = $m->clear();
+
+ $u->{_engine_boots} = $engine_boots;
+
+ $u->{_engine_time} = $engine_time;
+
+ my $encrypted = $u->_encrypt_data($m, $salt, $buff);
+
+ $henc = unpack 'H*', $encrypted;
+
+ $m->append($encrypted);
+
+ substr $salt, 0, 0, pack 'NN', $engine_boots, $engine_time;
+
+ $u->_decrypt_data($m, $salt, $m->process(OCTET_STRING));
+
+ # Remove padding if necessary
+
+ if ($len -= $m->length()) {
+
+ substr ${$m->reference()}, $len, -$len, q{};
+
+ '0422bae4cdb263a0936b189051e9b1759183b16d07c9a7d8bf633d6dd2e817a2ac2fe742',
+
+ $h2 = unpack 'H*', $u->_auth_hmac($m);
+
+skip($skip, ($@ || $h2), $h, 'Authentication failed');
+
+# ============================================================================
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