I've been all over the internet trying to figure out why I get two different results when trying to sign data using Crypt::OpenSSL::RSA and the following command line:

$ printf "$req_data" | openssl rsaautl -sign -inkey ~/.chef/asalvo13.pem | openssl env -base64

I'm trying to write a small interface between a Perl app and the Chef Server REST API. The code below generates the authentication headers to be send. The headers taken from the shell commands, when sent to our Chef server result in a successful request, but the Pure Perl headers do not.

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

use strict; 
use warnings;

my $req_data = qq[Method:GET
Hashed Path:1DfW7438O+6WjXaWOV69lrPO5z0=
X-Ops-Content-Hash:2jmj7l5rSw0yVb/vlWAYkK/YBwk=
X-Ops-Timestamp:2015-08-07T19:32:19Z
X-Ops-UserId:asalvo13];

my $keyfile = "$ENV{HOME}/.chef/asalvo13.pem";
my $keystr;
open(KEYFILE, "<$keyfile") || die "Cannot open $keyfile: $!\n";
{ 
  undef $/;
  $keystr = <KEYFILE>;
  close KEYFILE;
}

my $rsa_priv = Crypt::OpenSSL::RSA->new_private_key($keystr);

my $pure_perl = encode_base64($rsa_priv->sign($req_data));

my $shell_cmds = `printf "$req_data" | openssl rsautl -sign -inkey $ke
+yfile | openssl enc -base64`;

print "=" x 20,"BEGIN PURE PERL","=" x 20,"\n";
print $pure_perl;
print "=" x 20,"END PURE PERL","=" x 20,"\n\n";

print "=" x 20,"BEGIN SHELL COMMANDS","=" x 20,"\n";
print $shell_cmds;
print "=" x 20,"END SHELL COMMANDS","=" x 20,"\n";
[download]

Here's the output:

====================BEGIN PURE PERL====================
Ox4nMjzgrFKSV2GpSH6z80Mbk8zS2gTy0rvN6AyBYM/o9Bw+BbwEa5HuD8v7xlWUkGghE1
+8MT8A4
mkBuTFJlNRimpno1Dj+oifvcpsb1YQ+1uCvyDJAFNjJnlt0S5gDFejHg2Gn8/dp0Lx7dTp
+b6QRmk
1+VeKaHMwbkjGlihLNoDftrJlCsAqsQRGM3flXQrdXcOqfSeUVeRrUKzvV6W08i+bTwfvE
+ONLqRd
kqr3/nem1RuIp7G+BkZezmNdU372iPTf2JPZWtJS9SSTgzM+hzhsY/jEZ48USmjLKUcpHy
+55SRhy
aH9RpACL5Xfx6nqtK/K5Lk6ZD3x3nVJgVHV29Q==
====================END PURE PERL====================

====================BEGIN SHELL COMMANDS====================
jjLfh5dprypLNw+5KM2kB0k7ywVBYfL54zLCpgnhmi6xdFqn/CWBwOcOMnOe0Idt
CJhm+pkpIucOc/ABbgJ7r5+4r5rp9NvOasNcb9HRX3e8zs4aNQWOXTW8OwGgvw3R
PlUAqISW33mwytzcQjzlbQJ5DR/NAzTPBzoD/x/T3a/fuf6CySx0ZtbV0vsq9pBm
ekDAdZKS/ssw1OCqowYgdV3jMmcfSlVNnRLb0uY2wVxqhCA6waZ0Qq/DgV5MLRv2
DC9VdpiQJ+tG6L7Ncn8WN0hOY5yIiDpjsXecwNkbkSOoR0pzPe+Z00rsaFMMzFcY
TYgeoemNE2uBmFjlmDgF+g==
====================END SHELL COMMANDS====================
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Obviously I could simply have my library just make calls out to the shell, but I really would rather not. At the end of it all I'd really like to understand why the difference exists. So any insight would be appreciated.

I'm using..

- Crypt::OpenSSL::RSA version 0.28

- OpenSSL 0.9.8zf 19 Mar 2015

- OS X 10.10.4 (14E46)

- perl 5, version 18, subversion 1 (v5.18.1)