(Perl) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$rsa = chilkat::CkRsa->new();

# First load a public key object with a public key.
# In this case, we'll load it from a file.
$pubkey = chilkat::CkPublicKey->new();
$success = $pubkey->LoadFromFile("qa_data/pem/rsa_public.pem");
if ($success != 1) {
    print $pubkey->lastErrorText() . "\r\n";
    exit;
}

# RSA encryption is limited to small amounts of data. The limit
# is typically a few hundred bytes and is based on the key size and
# padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
# encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
$plainText = "Time is an illusion. Lunchtime doubly so.";

# Import the public key to be used for encrypting.
$success = $rsa->ImportPublicKeyObj($pubkey);

# To get OAEP padding, set the OaepPadding property:
$rsa->put_OaepPadding(1);

# To use SHA1 or SHA-256, set the OaepHash property
$rsa->put_OaepHash("sha256");
# for SHA1 --
$rsa->put_OaepHash("sha1");

# Indicate we'll want hex output
$rsa->put_EncodingMode("hex");

# Encrypt..
$usePrivateKey = 0;
$encryptedStr = $rsa->encryptStringENC($plainText,$usePrivateKey);
print $encryptedStr . "\r\n";

# -------------------------------------------------
# Now decrypt with the matching private key.
$rsa2 = chilkat::CkRsa->new();

$privKey = chilkat::CkPrivateKey->new();
$success = $privKey->LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd");
if ($success != 1) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

$success = $rsa2->ImportPrivateKeyObj($privKey);

# Make sure we have the same settings used for encryption.
$rsa2->put_OaepPadding(1);
$rsa2->put_EncodingMode("hex");
$rsa2->put_OaepHash("sha1");

$originalStr = $rsa2->decryptStringENC($encryptedStr,1);

print $originalStr . "\r\n";