Hello all! I ask you to help me understand what I am doing wrong.

I created two scripts:

RSA_encrypt_test.pl - encryption of plain text "Hello!!!" in the file "puzzle"

RSA_decrypt_test.pl - decryption of the ciphertext in the file "puzzle.encrypt"

I provide both scripts below.

#! /usr/bin/perl

# RSA_encrypt_test.pl

use strict;

use Crypt::OpenSSL::Bignum;
use Crypt::OpenSSL::Random;
use Crypt::OpenSSL::RSA;
use Data::Dumper ;

my $param_ref = {
    n => 'B99C5E09B0B215A4F65D34F4AF763F254D1094C1356951F40A6EDCBB5779
+A540C1EA363568002F7331A71085D3207C68B5B51C9F010272186261A181D65A80E9'
+,
    e => '10001',
    d => 'EC8AD0EDFFEFCD443D2C6023FEB37789137D65B18ADEC333F1200FF2CC15
+800C7C2FFA92AE70077DA2C4C6F1C3795EA00087E4E97A5BCF5CEAEDD1567841C46E'
};

my $n = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{n});
my $e = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{e});
my $d = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{d});

my $rsa = Crypt::OpenSSL::RSA->new_key_from_parameters($n, $e, $d);

my $target = "puzzle";

open my $OUTF, '>', "$target.encrypt" or die "Error opening file $targ
+et.decrypt: $!\n";
binmode $OUTF;
open my $F, '<', "$target" or die "Error opening file $target: $!\n";
binmode $F;

# ---------------- Checking by padding ------------------
#$rsa->use_no_padding();
#$rsa->use_pkcs1_padding();
#$rsa->use_pkcs1_oaep_padding();
#$rsa->use_sslv23_padding();

# ------------------ Checking all keys -------------------
#print $OUTF "private key is: %s\n", $rsa->get_private_key_string();  
+ 
#print $OUTF "public key is: %s\n", $rsa->get_public_key_string();
#print $OUTF "public key (in PKCS1 format) is: %s\n", $rsa->get_public
+_key_string();
#print $OUTF "public key (in X509 format) is:\n", $rsa->get_public_key
+_x509_string();

while (read $F, my $buffer, 8) {
   print $OUTF $rsa->encrypt($buffer);
}

close $OUTF or die "Error closing $target.decrypt: $!\n";
close $F or die "Error closing $target: $!\n";

[download]

-----------

#! /usr/bin/perl

# RSA_decrypt_test.pl

use strict;

use Crypt::OpenSSL::Bignum;
use Crypt::OpenSSL::Random;
use Crypt::OpenSSL::RSA;
use Data::Dumper ;

my $param_ref = {
    n => 'B99C5E09B0B215A4F65D34F4AF763F254D1094C1356951F40A6EDCBB5779
+A540C1EA363568002F7331A71085D3207C68B5B51C9F010272186261A181D65A80E9'
+,
    e => '10001',
    d => 'EC8AD0EDFFEFCD443D2C6023FEB37789137D65B18ADEC333F1200FF2CC15
+800C7C2FFA92AE70077DA2C4C6F1C3795EA00087E4E97A5BCF5CEAEDD1567841C46E'
};

my $n = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{n});
my $e = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{e});
my $d = Crypt::OpenSSL::Bignum->new_from_hex($param_ref->{d});

my $rsa = Crypt::OpenSSL::RSA->new_key_from_parameters($n, $e, $d);

my $target = "puzzle.encrypt";

open my $OUTF, '>', "$target.decrypt" or die "Error opening file $targ
+et.decrypt: $!\n";
binmode $OUTF;
open my $F, '<', "$target" or die "Error opening file $target: $!\n";
binmode $F;

# ---------------- Checking by padding ------------------
$rsa->use_no_padding();
#$rsa->use_pkcs1_padding();
#$rsa->use_pkcs1_oaep_padding();
#$rsa->use_sslv23_padding();

# ------------------ Checking all keys -------------------
#print $OUTF "private key is: %s\n", $rsa->get_private_key_string();  
+ 
#print $OUTF "public key is: %s\n", $rsa->get_public_key_string();
#print $OUTF "public key (in PKCS1 format) is: %s\n", $rsa->get_public
+_key_string();
#print $OUTF "public key (in X509 format) is:\n", $rsa->get_public_key
+_x509_string();

while (read $F, my $buffer, 64) {
   #print $OUTF $rsa->public_decrypt($buffer);
    print $OUTF $rsa->decrypt($buffer);
}

close $OUTF or die "Error closing $target.decrypt: $!\n";
close $F or die "Error closing $target: $!\n";

[download]

The RSA_encrypt_test.pl script encrypts the contents of the file "puzzle" without problems and creates the file "puzzle.encrypt" But the problem is that the RSA_decrypt_test.pl script cannot decrypt back. This works without error, but no result.

I have tried various types of padding but no result.

I ask everyone who has worked with RSA to help. What's my mistake?

In reply to RSA encrypt but no decrypt. What is the problem? by Forb

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