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jwsverify.pl
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#!/usr/bin/perl
#
# jwsverify.pl - JSON Web Signature Verifier
#
# USAGE:
#
# % jwsverify.pl JWSFILE PKCS8PUBLICKEYPEMFILE
#
# Verified OK
# .. or ..
# Verification Failure
my $VERSION = "1.0.0";
my $jwsFile = $ARGV[0];
my $pubKey = $ARGV[1];
sub _saveEsAsn1Sig {
my ($sigFile, $asn1SigFile) = @_;
my $s = "";
open(FIN, $sigFile) or die;
while (<FIN>) {
$s .= $_;
}
close FIN;
my $n = length($s);
my $sig1 = substr($s, 0, $n / 2);
my $sig2 = substr($s, $n / 2, $n / 2);
#print "sig1[0] = ", ord(substr($sig1, 0, 1)), "\n";
#print "sig2[0] = ", ord(substr($sig2, 0, 1)), "\n";
$sig1 = "\0" . $sig1 if ord(substr($sig1, 0, 1)) > 127;
$sig2 = "\0" . $sig2 if ord(substr($sig2, 0, 1)) > 127;
my $sig1der = chr(2) . chr(length($sig1)) . $sig1;
my $sig2der = chr(2) . chr(length($sig2)) . $sig2;
my $n2 = length($sig1der) + length($sig2der);
#print "n2 = ", $n2, "\n";
my $L = "";
if ($n2 > 127) {
$L = chr(129) . chr($n2);
} else {
$L = chr($n2);
}
my $sigder = chr(48) . $L . $sig1der . $sig2der;
open(FOUT, "> $asn1SigFile") or die;
print FOUT $sigder;
close FOUT;
}
sub _saveSigBin {
my ($sigB64U, $fileSig) = @_;
my $tmpFile = $fileSig . ".b64";
&_saveBase64File($sigB64U, $tmpFile);
system "openssl base64 -d -in $tmpFile -out $fileSig";
unlink $tmpFile;
};
sub _saveSI {
my ($headB64U, $payloadB64U, $fileName) = @_;
open(FOUT, "> $fileName") or die;
print FOUT $headB64U . "." . $payloadB64U;
close FOUT;
}
sub _getAlg {
my ($headB64U) = @_;
my $tmpFile = "/tmp/jv.head.$$";
&_saveHead($headB64U, $tmpFile);
my $s = "";
open(FIN, $tmpFile) or die;
while (<FIN>) {
$s .= $_;
}
close FIN;
unlink $tmpFile;
my $alg = "";
if ($s =~ /['"]alg['"]\s*:\s*['"]([EPR]S\d{3})['"]/) {
$alg = $1;
}
return $alg;
}
sub _saveHead {
my ($headB64U, $fileName) = @_;
&_saveBase64File($headB64U, $fileName . ".b64");
system "openssl base64 -d -in ${fileName}.b64 -out ${fileName}";
unlink $fileName . ".b64";
};
sub _saveBase64File {
my ($base64u, $fileName) = @_;
$base64u =~ s/-/+/g;
$base64u =~ s/_/\//g;
my $padlen = 4 - (length($base64u) % 4);
$padlen = 0 if $padlen == 4;
$base64u .= "=" if $padlen == 1;
$base64u .= "==" if $padlen == 2;
$base64u .= "===" if $padlen == 3;
my $s = $base64u;
my $r = "";
while (($s1, $s2) = ($s =~ /^(.{64})(.*)$/)) {
$r .= $s1 . "\r\n";
$s = $s2;
}
$r .= $s . "\r\n";
open(FOUT, "> $fileName") or die;
print FOUT $r;
close(FOUT);
};
my $jws = "";
open(FIN, $jwsFile) or die;
while (<FIN>) {
$jws .= $_;
}
close FIN;
#print $jws, "\n";
my ($headB64U, $payloadB64U, $sigB64U) = ($jws =~ /^(.+)\.(.+)\.(.+)$/);
#print $headB64U, "\n";
#print $payloadB64U, "\n";
#print $sigB64U, "\n";
my $alg = _getAlg($headB64U);
#print "alg = ", $alg, "\n";
my $fileSI = "/tmp/jv.SI.$$";
my $fileSig = "/tmp/jv.Sig.$$";
&_saveSI($headB64U, $payloadB64U, $fileSI);
&_saveSigBin($sigB64U, $fileSig);
my ($algType, $algSize) = ($alg =~ /^(..)(\d{3})$/);
if ($algType eq "PS") {
system "openssl dgst -sha${algSize} -sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:-1 -verify $pubKey -signature $fileSig $fileSI";
} elsif ($algType eq "RS") {
system "openssl dgst -sha${algSize} -verify $pubKey -signature $fileSig $fileSI";
} elsif ($algType eq "ES") {
my $asn1SigFile = $fileSig . ".asn1";
&_saveEsAsn1Sig($fileSig, $asn1SigFile);
system "openssl dgst -sha${algSize} -verify $pubKey -signature $asn1SigFile $fileSI";
unlink $asn1SigFile;
} else {
print "error: alg ${alg} not supported\n";
}
unlink $fileSI;
unlink $fileSig;