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Asked: 2026-06-12T22:59:03+00:00

I’m trying to decrypt an RSA encrypted message using the public key. Using Crypt::OpenSSL::RSA

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I’m trying to decrypt an RSA encrypted message using the public key.

Using Crypt::OpenSSL::RSA, I am able to encrypt using either key, but I can only decrypt with the private key. Attempting to decrypt with the public key:

use Crypt::OpenSSL::RSA;
use MIME::Base64;
use File::Slurp;

my $public_key  = 'rsa.pub.pem';
#my $private_key = 'rsa.priv.pem';
my $rsa_public  = Crypt::OpenSSL::RSA->new_public_key(scalar read_file $public_key);
#my $rsa_private = Crypt::OpenSSL::RSA->new_private_key(scalar read_file $private_key);

my $ciphertext_b64 = 'cqyPNNfqYaUeIsM1yAz7IsQ760Bkd4IPaatHnMQtQAMKtYTEUqFHwnSZ4hg2
pkoJM1N5Ejlv6Eqkk/ZaMWl1nTDOxRDj0V6PARQPqz3QF1UGWkSMxMt/DlSn
AtrRXgjvrILbMX5BsV2S5mHcLoCeNVb+jdnX0x0Uu/AAFPsByPRrt1yM1ORo
KcP+0ENvcvJ8yGOxJ2jOEmTFkQM5kjNDIFmLUlt6qODdTGWvYWR2CDduLO4m
qiyAt4yK5K3vwMybAG5ceRGb/kmMSW10EnvbryIdDGVGS8Zvodu3xqtbM1Yo
tdtZRDkcUcOYlUi3VRvSTimatVkJPG8QDlZofrBA0w==';

my $ciphertext = decode_base64($ciphertext_b64);

print $rsa_public->decrypt($ciphertext);
#print $rsa_private->decrypt($ciphertext);

Results in: Public keys cannot decrypt at test.pl line 19.

Incidentally, Ruby seems to have no problem encrypting and decrypting with either key (which is why I’m currently in this situation).

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1 Answer

  1. Editorial Team

    Did you realize there is a public_decrypt method in Crypt::OpenSSL::RSA?

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