I just looked at some of my code that successfully uses private keys (for signing). And found code like this:

use File::Slurp   qw(read_file);
use MIME::Base64  qw(encode_base64);

require Crypt::OpenSSL::RSA;

my $key_text = read_file( $key_filename );

my $rsa_key = Crypt::OpenSSL::RSA->new_private_key($key_text);
$rsa_key->use_pkcs1_padding();

my $bin_signature = $rsa_key->sign($plaintext);

print encode_base64($bin_signature, '');

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In reply to Re^5: Crypt::RSA Cant load private key by grantm
in thread Crypt::RSA Cant load private key by ulisescastillo

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