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CryptX-0.066_001
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/ Crypt::PK::X25519

NAME

Crypt::PK::X25519 - Asymmetric cryptography based on X25519

SYNOPSIS

METHODS

new

generate_key

Uses Yarrow-based cryptographically strong random number generator seeded with random data taken from /dev/random (UNIX) or CryptGenRandom (Win32).

$pk->generate_key;

import_key

Loads private or public key in DER or PEM format.

$pk->import_key($filename);
#or
$pk->import_key(\$buffer_containing_key);

Support for password protected PEM keys:

$pk->import_key($filename, $password);
#or
$pk->import_key(\$buffer_containing_key, $password);

Loading private or public keys form perl hash:

$pk->import_key($hashref);

# the $hashref is either a key exported via key2hash
$pk->import_key({
     curve => "x25519",
     pub   => "EA7806F721A8570512C8F6EFB4E8D620C49A529E4DF5EAA77DEC646FB1E87E41",
     priv  => "002F93D10BA5728D8DD8E9527721DABA3261C0BB1BEFDE7B4BBDAC631D454651",
});

# or a hash with items corresponding to JWK (JSON Web Key)
$pk->import_key({
      kty => "OKP",
      crv => "X25519",
      d   => "AC-T0Qulco2N2OlSdyHaujJhwLsb7957S72sYx1FRlE",
      x   => "6ngG9yGoVwUSyPbvtOjWIMSaUp5N9eqnfexkb7HofkE",
});

Supported key formats:

# all formats can be loaded from a file
my $pk = Crypt::PK::X25519->new($filename);

# or from a buffer containing the key
my $pk = Crypt::PK::X25519->new(\$buffer_with_key);

  • X25519 private keys in PEM format

    -----BEGIN X25519 PRIVATE KEY-----
MC4CAQAwBQYDK2VuBCIEIAAvk9ELpXKNjdjpUnch2royYcC7G+/ee0u9rGMdRUZR
-----END X25519 PRIVATE KEY-----

  • X25519 private keys in password protected PEM format

    -----BEGIN X25519 PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-CBC,DEEFD3D6B714E75A

dfFWP5bKn49aZ993NVAhQQPdFWgsTb4j8CWhRjGBVTPl6ITstAL17deBIRBwZb7h
pAyIka81Kfs=
-----END X25519 PRIVATE KEY-----

  • X25519 public keys in PEM format

    -----BEGIN PUBLIC KEY-----
MCowBQYDK2VuAyEA6ngG9yGoVwUSyPbvtOjWIMSaUp5N9eqnfexkb7HofkE=
-----END PUBLIC KEY-----

  • PKCS#8 private keys

    -----BEGIN PRIVATE KEY-----
MC4CAQAwBQYDK2VuBCIEIAAvk9ELpXKNjdjpUnch2royYcC7G+/ee0u9rGMdRUZR
-----END PRIVATE KEY-----

  • PKCS#8 encrypted private keys

    -----BEGIN ENCRYPTED PRIVATE KEY-----
MIGHMEsGCSqGSIb3DQEFDTA+MCkGCSqGSIb3DQEFDDAcBAiS0NOFZmjJswICCAAw
DAYIKoZIhvcNAgkFADARBgUrDgMCBwQIGd40Hdso8Y4EONSRCTrqvftl9hl3zbH9
2QmHF1KJ4HDMdLDRxD7EynonCw2SV7BO+XNRHzw2yONqiTybfte7nk9t
-----END ENCRYPTED PRIVATE KEY-----

  • X25519 private keys in JSON Web Key (JWK) format

    See https://tools.ietf.org/html/rfc8037

    {
 "kty":"OKP",
 "crv":"X25519",
 "x":"6ngG9yGoVwUSyPbvtOjWIMSaUp5N9eqnfexkb7HofkE",
 "d":"AC-T0Qulco2N2OlSdyHaujJhwLsb7957S72sYx1FRlE",
}

    BEWARE: For JWK support you need to have JSON::PP, JSON::XS or Cpanel::JSON::XS module.

  • X25519 public keys in JSON Web Key (JWK) format

    {
 "kty":"OKP",
 "crv":"X25519",
 "x":"6ngG9yGoVwUSyPbvtOjWIMSaUp5N9eqnfexkb7HofkE",
}

    BEWARE: For JWK support you need to have JSON::PP, JSON::XS or Cpanel::JSON::XS module.

import_key_raw

Import raw public/private key - can load raw key data exported by "export_key_raw".

$pk->import_key_raw($key, 'public');
$pk->import_key_raw($key, 'private');

export_key_der

my $private_der = $pk->export_key_der('private');
#or
my $public_der = $pk->export_key_der('public');

export_key_pem

my $private_pem = $pk->export_key_pem('private');
#or
my $public_pem = $pk->export_key_pem('public');

export_key_jwk

Exports public/private keys as a JSON Web Key (JWK).

my $private_json_text = $pk->export_key_jwk('private');
#or
my $public_json_text = $pk->export_key_jwk('public');

Also exports public/private keys as a perl HASH with JWK structure.

my $jwk_hash = $pk->export_key_jwk('private', 1);
#or
my $jwk_hash = $pk->export_key_jwk('public', 1);

BEWARE: For JWK support you need to have JSON::PP, JSON::XS or Cpanel::JSON::XS module.

export_key_raw

Export raw public/private key

my $private_bytes = $pk->export_key_raw('private');
#or
my $public_bytes = $pk->export_key_raw('public');

shared_secret

# Alice having her priv key $pk and Bob's public key $pkb
my $pk  = Crypt::PK::X25519->new($priv_key_filename);
my $pkb = Crypt::PK::X25519->new($pub_key_filename);
my $shared_secret = $pk->shared_secret($pkb);

# Bob having his priv key $pk and Alice's public key $pka
my $pk = Crypt::PK::X25519->new($priv_key_filename);
my $pka = Crypt::PK::X25519->new($pub_key_filename);
my $shared_secret = $pk->shared_secret($pka);  # same value as computed by Alice

is_private

my $rv = $pk->is_private;
# 1 .. private key loaded
# 0 .. public key loaded
# undef .. no key loaded

key2hash

my $hash = $pk->key2hash;

# returns hash like this (or undef if no key loaded):
{
  curve => "x25519",
  # raw public key as a hexadecimal string
  pub   => "EA7806F721A8570512C8F6EFB4E8D620C49A529E4DF5EAA77DEC646FB1E87E41",
  # raw private key as a hexadecimal string. undef if key is public only
  priv  => "002F93D10BA5728D8DD8E9527721DABA3261C0BB1BEFDE7B4BBDAC631D454651",
}

SEE ALSO