Crypt::PK::X448(3) User Contributed Perl Documentation Crypt::PK::X448(3)
NAME
Crypt::PK::X448 - Asymmetric cryptography based on X448
SYNOPSIS
use Crypt::PK::X448;
my $alice = Crypt::PK::X448->new->generate_key;
my $bob = Crypt::PK::X448->new->generate_key;
my $alice_secret = $alice->shared_secret($bob);
my $bob_secret = $bob->shared_secret($alice);
die "ERROR" unless $alice_secret eq $bob_secret;
my $pk = Crypt::PK::X448->new;
$pk->import_key_raw(
pack("H*", "cf807ab0fc3efa03108469f29e499db2eefefeb12544d8d4e711f187385aaf31b4f38c8f84a3dd9e43da309fd410c3816a50e644b5500c05"),
"public",
);
my $sk = Crypt::PK::X448->new;
$sk->import_key_raw(
pack("H*", "10d418b111401956abc5a92c2fbb8406d1d646ba930fdefa2108efe68f2000973755aa952be018f640947c05135fbf9925ebd4da828d86ec"),
"private",
);
my $generated = Crypt::PK::X448->new->generate_key;
my $private_der = $generated->export_key_der('private');
my $public_pem = $generated->export_key_pem('public');
my $private_jwk = $generated->export_key_jwk('private');
DESCRIPTION
Since: CryptX-0.089
METHODS
new
my $source = Crypt::PK::X448->new();
$source->generate_key;
my $public_der = $source->export_key_der('public');
my $pub = Crypt::PK::X448->new(\$public_der);
my $private_pem = $source->export_key_pem('private', 'secret', 'AES-256-CBC');
my $priv = Crypt::PK::X448->new(\$private_pem, 'secret');
Passing $filename or "\$buffer" to "new" is equivalent: both forms
immediately import the key material into the new object.
generate_key
Returns the object itself (for chaining).
$pk->generate_key;
import_key
Loads X448 private or public keys from DER, PEM, PKCS#8,
SubjectPublicKeyInfo, or JWK.
my $source = Crypt::PK::X448->new();
$source->generate_key;
my $public_der = $source->export_key_der('public');
my $pub = Crypt::PK::X448->new();
$pub->import_key(\$public_der);
my $private_pem = $source->export_key_pem('private', 'secret', 'AES-256-CBC');
my $priv = Crypt::PK::X448->new();
$priv->import_key(\$private_pem, 'secret');
$pk->import_key({
curve => "x448",
pub => "CF807AB0FC3EFA03108469F29E499DB2EEFEFEB12544D8D4E711F187385AAF31B4F38C8F84A3DD9E43DA309FD410C3816A50E644B5500C05",
priv => "10D418B111401956ABC5A92C2FBB8406D1D646BA930FDEFA2108EFE68F2000973755AA952BE018F640947C05135FBF9925EBD4DA828D86EC",
});
$pk->import_key({
kty => "OKP",
crv => "X448",
d => "ENQYsRFAGVarxaksL7uEBtHWRrqTD976IQjv5o8gAJc3VaqVK-AY9kCUfAUTX7-ZJevU2oKNhuw",
x => "z4B6sPw--gMQhGnynkmdsu7-_rElRNjU5xHxhzharzG084yPhKPdnkPaMJ_UEMOBalDmRLVQDAU",
});
The same method also accepts filenames instead of buffers.
import_key_raw
Import raw public/private key bytes.
$pk->import_key_raw($key, 'public');
$pk->import_key_raw($key, 'private');
The raw key must be exactly 56 bytes long.
export_key_der
Returns the key as a binary DER-encoded string.
my $der = $pk->export_key_der('private');
my $der = $pk->export_key_der('public');
export_key_pem
Returns the key as a PEM-encoded string (ASCII).
my $pem = $pk->export_key_pem('private');
my $pem = $pk->export_key_pem('public');
my $pem = $pk->export_key_pem('private', $password, 'AES-256-CBC');
export_key_jwk
Returns a JSON string, or a hashref if the optional second argument is
true.
my $json = $pk->export_key_jwk('private');
my $hash = $pk->export_key_jwk('public', 1);
export_key_raw
Returns the raw key as a binary string.
my $raw = $pk->export_key_raw('private');
my $raw = $pk->export_key_raw('public');
shared_secret
Returns the shared secret as a binary string (raw bytes).
my $shared_secret = $private_key->shared_secret($public_key);
is_private
my $rv = $pk->is_private;
key2hash
Returns a hashref with the key components, or "undef" if no key is
loaded.
my $hash = $pk->key2hash;
Returns a hash like:
{
curve => "x448",
pub => "CF807AB0FC3EFA03108469F29E499DB2EEFEFEB12544D8D4E711F187385AAF31B4F38C8F84A3DD9E43DA309FD410C3816A50E644B5500C05",
priv => "10D418B111401956ABC5A92C2FBB8406D1D646BA930FDEFA2108EFE68F2000973755AA952BE018F640947C05135FBF9925EBD4DA828D86EC",
}
OpenSSL interoperability
# Generate a key with OpenSSL
# openssl genpkey -algorithm x448 -out x448_priv.pem
# openssl pkey -in x448_priv.pem -pubout -out x448_pub.pem
# Load the OpenSSL-generated key in CryptX
use Crypt::PK::X448;
my $alice = Crypt::PK::X448->new("x448_priv.pem");
my $bob_pub = Crypt::PK::X448->new("bob_x448_pub.pem");
# Derive shared secret
my $shared_secret = $alice->shared_secret($bob_pub);
# Export CryptX key for OpenSSL
my $pem = $alice->export_key_pem('private');
# then: openssl pkey -in priv.pem -text -noout
SEE ALSO
o Crypt::PK::X25519(3)
o <https://www.rfc-editor.org/rfc/rfc7748>
perl v5.34.3 2026-05-11 Crypt::PK::X448(3)
p5.34-cryptx 0.89.0 - Generated Tue May 12 15:53:29 CDT 2026