I want to sign .pdf file digitally and after that to create attached signature file and detached signature file, using Crypt::OpenSSL::RSA.

This is what I did:

1. Initialization

my $s_pdf_file_to_sign = 'pdf_file_to_sign';
my $s_private_key_file = 'private_key_file';
my $s_cert_file = 'certificate_file';

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2. Read .pdf file content

my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
        $atime,$mtime,$ctime,$blksize,$blocks) = stat $s_pdf_to_sign;
open FILE, "<$s_pdf_to_sign" or die "no such file";
binmode FILE;
my $s_pdf_to_sign_string;
read FILE, $s_pdf_to_sign_string, $size;
close FILE;

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3.Read private key content:

($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
        $atime,$mtime,$ctime,$blksize,$blocks) = stat $s_private_key;
open FILE, "<$s_private_key" or die "no such file";
binmode FILE;
my $s_private_key_content;
read FILE, $s_private_key_content, $size;
close FILE;

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4. Create private_key object:

my $s_private_key_string = $s_private_key_content;
my $oref_rsa_priv = Crypt::OpenSSL::RSA->new_private_key($s_private_ke
+y_content) or die "new_private_key error";

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5. Sign pdf file content:

my $signature = $oref_rsa_priv->sign($s_pdf_content);

Could someone tell me what contains $signature variable? What should I do to create the attached and detached signatures?

In reply to Sign pdf file digitally by LoraIlieva

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