NAME

Crypt::PK::RSA - Public key cryptography based on RSA

SYNOPSIS

### OO interface

#Encryption: Alice
my $pub = Crypt::PK::RSA->new('Bob_pub_rsa1.der');
my $ct = $pub->encrypt("secret message");
#
#Encryption: Bob (received ciphertext $ct)
my $priv = Crypt::PK::RSA->new('Bob_priv_rsa1.der');
my $pt = $priv->decrypt($ct);

#Signature: Alice
my $priv = Crypt::PK::RSA->new('Alice_priv_rsa1.der');
my $sig = $priv->sign_message($message);
#
#Signature: Bob (received $message + $sig)
my $pub = Crypt::PK::RSA->new('Alice_pub_rsa1.der');
$pub->verify_message($sig, $message) or die "ERROR";

#Key generation
my $pk = Crypt::PK::RSA->new();
$pk->generate_key(256, 65537);
my $private_der = $pk->export_key_der('private');
my $public_der = $pk->export_key_der('public');
my $private_pem = $pk->export_key_pem('private');
my $public_pem = $pk->export_key_pem('public');

### Functional interface

#Encryption: Alice
my $ct = rsa_encrypt('Bob_pub_rsa1.der', "secret message");
#Encryption: Bob (received ciphertext $ct)
my $pt = rsa_decrypt('Bob_priv_rsa1.der', $ct);

#Signature: Alice
my $sig = rsa_sign_message('Alice_priv_rsa1.der', $message);
#Signature: Bob (received $message + $sig)
rsa_verify_message('Alice_pub_rsa1.der', $sig, $message) or die "ERROR";

FUNCTIONS

rsa_encrypt

RSA based encryption. See method "encrypt" below.

my $ct = rsa_encrypt($pub_key_filename, $message);
#or
my $ct = rsa_encrypt(\$buffer_containing_pub_key, $message);
#or
my $ct = rsa_encrypt($pub_key, $message, $padding);
#or
my $ct = rsa_encrypt($pub_key, $message, 'oaep', $hash_name, $lparam);

rsa_decrypt

RSA based decryption. See method "decrypt" below.

my $pt = rsa_decrypt($priv_key_filename, $ciphertext);
#or
my $pt = rsa_decrypt(\$buffer_containing_priv_key, $ciphertext);
#or
my $pt = rsa_decrypt($priv_key, $ciphertext, $padding);
#or
my $pt = rsa_decrypt($priv_key, $ciphertext, 'oaep', $hash_name, $lparam);

rsa_sign_message

Generate RSA signature. See method "sign_message" below.

my $sig = rsa_sign_message($priv_key_filename, $message);
#or
my $sig = rsa_sign_message(\$buffer_containing_priv_key, $message);
#or
my $sig = rsa_sign_message($priv_key, $message, $hash_name);
#or
my $sig = rsa_sign_message($priv_key, $message, $hash_name, $padding);
#or
my $sig = rsa_sign_message($priv_key, $message, $hash_name, 'pss', $saltlen);

rsa_verify_message

Verify RSA signature. See method "verify_message" below.

rsa_verify_message($pub_key_filename, $signature, $message) or die "ERROR";
#or
rsa_verify_message(\$buffer_containing_pub_key, $signature, $message) or die "ERROR";
#or
rsa_verify_message($pub_key, $signature, $message, $hash_name) or die "ERROR";
#or
rsa_verify_message($pub_key, $signature, $message, $hash_name, $padding) or die "ERROR";
#or
rsa_verify_message($pub_key, $signature, $message, $hash_name, 'pss', $saltlen) or die "ERROR";

rsa_sign_hash

Generate RSA signature. See method "sign_hash" below.

my $sig = rsa_sign_hash($priv_key_filename, $message_hash);
#or
my $sig = rsa_sign_hash(\$buffer_containing_priv_key, $message_hash);
#or
my $sig = rsa_sign_hash($priv_key, $message_hash, $hash_name);
#or
my $sig = rsa_sign_hash($priv_key, $message_hash, $hash_name, $padding);
#or
my $sig = rsa_sign_hash($priv_key, $message_hash, $hash_name, 'pss', $saltlen);

rsa_verify_hash

Verify RSA signature. See method "verify_hash" below.

rsa_verify_hash($pub_key_filename, $signature, $message_hash) or die "ERROR";
#or
rsa_verify_hash(\$buffer_containing_pub_key, $signature, $message_hash) or die "ERROR";
#or
rsa_verify_hash($pub_key, $signature, $message_hash, $hash_name) or die "ERROR";
#or
rsa_verify_hash($pub_key, $signature, $message_hash, $hash_name, $padding) or die "ERROR";
#or
rsa_verify_hash($pub_key, $signature, $message_hash, $hash_name, 'pss', $saltlen) or die "ERROR";

METHODS

new

my $pk = Crypt::PK::RSA->new();
#or
my $pk = Crypt::PK::RSA->new($priv_or_pub_key_filename);
#or
my $pk = Crypt::PK::RSA->new(\$buffer_containing_priv_or_pub_key);

generate_key

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

$pk->generate_key($size, $e);
# $size .. key size: 128-512 bytes (DEFAULT is 256)
# $e ..... exponent: 3, 17, 257 or 65537 (DEFAULT is 65537)

import_key

Loads private or public key in DER or PEM format (password protected keys are not supported).

$pk->import_key($priv_or_pub_key_filename);
#or
$pk->import_key(\$buffer_containing_priv_or_pub_key);

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');

encrypt

my $pk = Crypt::PK::RSA->new($pub_key_filename);
my $ct = $pk->encrypt($message);
#or
my $ct = $pk->encrypt($message, $padding);
#or
my $ct = $pk->encrypt($message, 'oaep', $hash_name, $lparam);

# $padding .................... 'oaep' (DEFAULT), 'v1.5' or 'none'
# $hash_name (only for oaep) .. 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest
# $lparam (only for oaep) ..... DEFAULT is empty string

decrypt

my $pk = Crypt::PK::RSA->new($priv_key_filename);
my $pt = $pk->decrypt($ciphertext);
#or
my $pt = $pk->decrypt($ciphertext, $padding);
#or
my $pt = $pk->decrypt($ciphertext, 'oaep', $hash_name, $lparam);

#NOTE: $padding, $hash_name, $lparam - see encrypt method

sign_message

my $pk = Crypt::PK::RSA->new($priv_key_filename);
my $signature = $priv->sign_message($message);
#or
my $signature = $priv->sign_message($message, $hash_name);
#or
my $signature = $priv->sign_message($message, $hash_name, $padding);
#or
my $signature = $priv->sign_message($message, $hash_name, 'pss', $saltlen);

# $hash_name ............... 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest
# $padding ................. 'pss' (DEFAULT) or 'v1.5'
# $saltlen (only for pss) .. DEFAULT is 12

verify_message

my $pk = Crypt::PK::RSA->new($pub_key_filename);
my $valid = $pub->verify_message($signature, $message);
#or
my $valid = $pub->verify_message($signature, $message, $padding);
#or
my $valid = $pub->verify_message($signature, $message, $padding, $hash_name);
#or
my $valid = $pub->verify_message($signature, $message, 'pss', $hash_name, $saltlen);

#NOTE: $hash_name, $padding, $saltlen - see sign_message method

sign_hash

my $pk = Crypt::PK::RSA->new($priv_key_filename);
my $signature = $priv->sign_hash($message_hash);
#or
my $signature = $priv->sign_hash($message_hash, $hash_name);
#or
my $signature = $priv->sign_hash($message_hash, $hash_name, $padding);
#or
my $signature = $priv->sign_hash($message_hash, $hash_name, 'pss', $saltlen);

#NOTE: $hash_name, $padding, $saltlen - see sign_message method

verify_hash

my $pk = Crypt::PK::RSA->new($pub_key_filename);
my $valid = $pub->verify_hash($signature, $message_hash);
#or
my $valid = $pub->verify_hash($signature, $message_hash, $padding);
#or
my $valid = $pub->verify_hash($signature, $message_hash, $padding, $hash_name);
#or
my $valid = $pub->verify_hash($signature, $message_hash, 'pss', $hash_name, $saltlen);

#NOTE: $hash_name, $padding, $saltlen - see sign_message method

is_private

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

size

my $size = $pk->size;
# returns key size in bytes or undef if no key loaded

key2hash

my $hash = $pk->key2hash;

# returns hash like this (or undef if no key loaded):
{
  type => 1,   # integer: 1 .. private, 0 .. public
  size => 256, # integer: key size in bytes
  # all the rest are hex strings
  e  => "10001", #public exponent
  d  => "9ED5C3D3F866E06957CA0E9478A273C39BBDA4EEAC5B...", #private exponent
  N  => "D0A5CCCAE03DF9C2F5C4C8C0CE840D62CDE279990DC6...", #modulus
  p  => "D3EF0028FFAB508E2773C659E428A80FB0E9211346B4...", #p factor of N
  q  => "FC07E46B163CAB6A83B8E467D169534B2077DCDEECAE...", #q factor of N
  qP => "88C6D406F833DF73C8B734548E0385261AD51F4187CF...", #1/q mod p CRT param
  dP => "486F142FEF0A1F53269AC43D2EE4D263E2841B60DA36...", #d mod (p - 1) CRT param
  dQ => "4597284B2968B72C4212DB7E8F24360B987B80514DA9...", #d mod (q - 1) CRT param
}

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