[X-Unix] En/Decrypt Mismatch: Command-Line openssl vs. Perl's Crypt::OpenSSL::RSA

[Jerry Krinock]

I cannot get RSA-encrypted messages which I generate using Perl's  
Crypt::OpenSSL::RSA to decrypt using the openssl command-line tool.

Attempting to cut the problem in half, I then did another experiment   
to see if these two tools would would generate the same signature.   
They don't.  So I conclude that the problem is in the ENcrypting.  I  
gave both encryptors (Crypt::OpenSSL::RSA and openssl command) the...

   Same message
   Same private key
   Same padding (PKCS1)
   Same digest (SHA1)
   Both running on same Macintosh, presumably using the same
      OpenSSL version 0.9.7l library in Mac OS X 10.5.4.

Here are my commands/code and results, starting with the command-line:

###############################################################
# Create a private key
Jerrys-Mac-Mini: jk$ openssl genrsa -out Test248.private.pem
Generating RSA private key, 512 bit long modulus
.........++++++++++++
.............++++++++++++
e is 65537 (0x10001)

# Create signature of message "Bonehead" using the key in file
# Test248.private.pem, SHA1 digest and PKCS padding [1]:

Jerrys-Mac-Mini: jk$ echo -n "Bonehead" \
| openssl dgst -sha1 -binary\
| openssl rsautl -pkcs -sign -inkey Test248.private.pem -hexdump
0000 - 8a c6 56 19 97 f5 e7 16-20 30 f2 2f 0e af 7c 28
0010 - df 9d cd 5a 0e b0 11 c1-cc bb f2 3b 03 87 f0 96
0020 - 0d ce b4 55 dc 69 81 bc-30 40 75 9d 74 b8 b7 bd
0030 - 3b 15 a0 5d c2 db ab 9a-8d d3 f2 4b 77 e1 e9 a1
##############################################################

Now I try to create the same signature using a perl script:

##############################################################
#!/usr/local/bin/perl -w

use strict ;
use warnings ;

use Crypt::OpenSSL::Random ;
use Crypt::OpenSSL::RSA ;

# Read in the key file just created
my $private_key_string = "" ;
my $key_path = "/Users/jk/Documents/SheepSystems/Keys/
Test248.private.pem" ;
open (KEY_FILE, $key_path) ;
    while (my $line = <KEY_FILE>) {
        $private_key_string .= $line ;
    }
close(KEY_FILE);

print "Read key from file:\n$private_key_string\n" ;

my $rsa_priv = Crypt::OpenSSL::RSA-


 >new_private_key($private_key_string);

# Use same message, padding and digest as in the command-line test
my $msg = "Bonehead" ;
$rsa_priv->use_pkcs1_padding();
$rsa_priv->use_sha1_hash() ;
my $signature = $rsa_priv->sign($msg);
my $showHexSig = showHex($signature) ;
print "signature of 'Bonehead':\n$showHexSig\n" ;

# sub showHex is shown at the bottom of this message
##############################################################

Running the above script, I get this:

##############################################################
Read key from file:
-----BEGIN RSA PRIVATE KEY-----
MIIBOgIBAAJBALE2d5DpKbYxfIqv+6jYnW6DDvDyJFCdQt+s432GQsy8+ymL9DOR
mPcRQfk1jas1pqtsy+GGUlYd4R1kxbBZb4UCAwEAAQJANqtw83ma7qQRoc9sucgp
uUAhSd/JqDz7tnllrQHQdcyLMRSCBxvZ/i72YVixRRTHb1GVZ79iJWBmzh8ATLvj
uQIhAOuYWu6Vkve+zQ4Cd5EGWpytY/Or/6ZXvQf3L9ELIB07AiEAwI+miVT8t22w
Ge1IX+Q3L7lK2uBm97Pkwix9Wf7K2j8CIFUrQtQ1ZmgBpgeGhMr8zQ0O8a9JYqYz
2bZjefnMV9O5AiEAqSrKLKYcKm1To0NhLNUKYoPPLkCsVPqWgruhGDoOLfMCIE1E
kpJF13Dtq3KQOsaCoXbL4vo350vkBUrSovu45/6p
-----END RSA PRIVATE KEY-----

signature of 'Bonehead':
64 bytes:
78 b3 43 22 4b 4b 86 7f 47 25 00 f1 62 a2 66 70
e6 7e 82 f2 7a b6 cf ff ab dd f1 8a ff 0d cf a1
b5 3d 60 dc ac 9f 6f 0c 83 b9 51 c9 ac fa 7d 15
0b cc 97 cf 99 e5 6b ee 41 f0 d1 35 a1 a0 c1 09
##############################################################

As you can see the two signatures are both 64 bytes long but do not  
match.

What might I be missing?

Thanks very much,

Jerry Krinock

[1] The reason I used PKCS padding (-pkcs) is because if I change it   
to -oaep in the command-line test, I get an error message:
RSA operation error
   error:04066076:rsa routines:RSA_EAY_PRIVATE_ENCRYPT:unknown padding
type:rsa_eay.c:360:
which does not make sense because my version is:

Jerrys-Mac-Mini:Keys jk$ openssl
OpenSSL> version
OpenSSL 0.9.7l 28 Sep 2006

and "RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP()  
were added in OpenSSL 0.9.2b" according to documentation:
http://openssl.org/docs/crypto/RSA_padding_add_PKCS1_type_1.html#

[2]
sub showHex {
    my $data = shift ;
    use bytes ;
    my $len = length($data) ;
    my $i ;
    my $show = "" ;
    for ($i=0; $i<$len; $i++) {
        my $value = ord(substr($data, $i, 1)) ;
        $show .= " " ;
        $show .= sprintf("%02x", $value) ;
        if ((($i+1) % 16) == 0) {
            $show .= "\n" ;
        }
    }

    return "$len bytes:\n$show" ;