diff options
Diffstat (limited to 'lib/Crypt/PK/DH.pm')
| -rw-r--r-- | lib/Crypt/PK/DH.pm | 643 |
1 files changed, 643 insertions, 0 deletions
diff --git a/lib/Crypt/PK/DH.pm b/lib/Crypt/PK/DH.pm new file mode 100644 index 00000000..445aea48 --- /dev/null +++ b/lib/Crypt/PK/DH.pm @@ -0,0 +1,643 @@ +package Crypt::PK::DH; + +use strict; +use warnings; +our $VERSION = '0.048'; + +require Exporter; our @ISA = qw(Exporter); ### use Exporter 'import'; +our %EXPORT_TAGS = ( all => [qw( dh_encrypt dh_decrypt dh_sign_message dh_verify_message dh_sign_hash dh_verify_hash dh_shared_secret )] ); +our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } ); +our @EXPORT = qw(); + +use Carp; +use CryptX; +use Crypt::Digest 'digest_data'; +use Crypt::Misc qw(read_rawfile); + +my %DH_PARAMS = ( + ike768 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFFF' + }, + ike1024 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381'. + 'FFFFFFFFFFFFFFFF' + }, + ike1536 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF' + }, + ike2048 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B'. + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9'. + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510'. + '15728E5A8AACAA68FFFFFFFFFFFFFFFF' + }, + ike3072 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B'. + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9'. + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510'. + '15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64'. + 'ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7'. + 'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B'. + 'F12FFA06D98A0864D87602733EC86A64521F2B18177B200C'. + 'BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31'. + '43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF' + }, + ike4096 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B'. + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9'. + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510'. + '15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64'. + 'ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7'. + 'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B'. + 'F12FFA06D98A0864D87602733EC86A64521F2B18177B200C'. + 'BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31'. + '43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7'. + '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA'. + '2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6'. + '287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED'. + '1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9'. + '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199'. + 'FFFFFFFFFFFFFFFF' + }, + ike6144 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B'. + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9'. + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510'. + '15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64'. + 'ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7'. + 'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B'. + 'F12FFA06D98A0864D87602733EC86A64521F2B18177B200C'. + 'BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31'. + '43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7'. + '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA'. + '2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6'. + '287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED'. + '1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9'. + '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492'. + '36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BD'. + 'F8FF9406AD9E530EE5DB382F413001AEB06A53ED9027D831'. + '179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B'. + 'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF'. + '5983CA01C64B92ECF032EA15D1721D03F482D7CE6E74FEF6'. + 'D55E702F46980C82B5A84031900B1C9E59E7C97FBEC7E8F3'. + '23A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA'. + 'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE328'. + '06A1D58BB7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55C'. + 'DA56C9EC2EF29632387FE8D76E3C0468043E8F663F4860EE'. + '12BF2D5B0B7474D6E694F91E6DCC4024FFFFFFFFFFFFFFFF' + }, + ike8192 => { g => 2, p => 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1'. + '29024E088A67CC74020BBEA63B139B22514A08798E3404DD'. + 'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245'. + 'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED'. + 'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D'. + 'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F'. + '83655D23DCA3AD961C62F356208552BB9ED529077096966D'. + '670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B'. + 'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9'. + 'DE2BCBF6955817183995497CEA956AE515D2261898FA0510'. + '15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64'. + 'ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7'. + 'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B'. + 'F12FFA06D98A0864D87602733EC86A64521F2B18177B200C'. + 'BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31'. + '43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7'. + '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA'. + '2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6'. + '287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED'. + '1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9'. + '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492'. + '36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BD'. + 'F8FF9406AD9E530EE5DB382F413001AEB06A53ED9027D831'. + '179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B'. + 'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF'. + '5983CA01C64B92ECF032EA15D1721D03F482D7CE6E74FEF6'. + 'D55E702F46980C82B5A84031900B1C9E59E7C97FBEC7E8F3'. + '23A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA'. + 'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE328'. + '06A1D58BB7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55C'. + 'DA56C9EC2EF29632387FE8D76E3C0468043E8F663F4860EE'. + '12BF2D5B0B7474D6E694F91E6DBE115974A3926F12FEE5E4'. + '38777CB6A932DF8CD8BEC4D073B931BA3BC832B68D9DD300'. + '741FA7BF8AFC47ED2576F6936BA424663AAB639C5AE4F568'. + '3423B4742BF1C978238F16CBE39D652DE3FDB8BEFC848AD9'. + '22222E04A4037C0713EB57A81A23F0C73473FC646CEA306B'. + '4BCBC8862F8385DDFA9D4B7FA2C087E879683303ED5BDD3A'. + '062B3CF5B3A278A66D2A13F83F44F82DDF310EE074AB6A36'. + '4597E899A0255DC164F31CC50846851DF9AB48195DED7EA1'. + 'B1D510BD7EE74D73FAF36BC31ECFA268359046F4EB879F92'. + '4009438B481C6CD7889A002ED5EE382BC9190DA6FC026E47'. + '9558E4475677E9AA9E3050E2765694DFC81F56E880B96E71'. + '60C980DD98EDD3DFFFFFFFFFFFFFFFFF' + } +); + +sub new { + my ($class, $f) = @_; + my $self = _new(); + $self->import_key($f) if $f; + return $self; +} + +sub import_key { + my ($self, $key) = @_; + croak "FATAL: undefined key" unless $key; + my $data; + if (ref($key) eq 'SCALAR') { + $data = $$key; + } + elsif (-f $key) { + $data = read_rawfile($key); + } + else { + croak "FATAL: non-existing file '$key'"; + } + croak "FATAL: invalid key format" unless $data; + return $self->_import($data); +} + +sub import_key_raw { + my ($self, $raw_bytes, $type, $param) = @_; + my ($g, $p, $x, $y); + + if (ref $param eq 'HASH') { + $g = $param->{g} or croak "FATAL: 'g' param not specified"; + $p = $param->{p} or croak "FATAL: 'p' param not specified"; + $g =~ s/^0x//; + $p =~ s/^0x//; + } elsif (my $dhparam = $DH_PARAMS{$param}) { + $g = $dhparam->{g}; + $p = $dhparam->{p}; + } else { + croak "FATAL: invalid parameter"; + } + + if ($type eq 'private') { + $type = 1; + } elsif ($type eq 'public') { + $type = 0; + } else { + croak "FATAL: invalid key type '$type'"; + } + my $rv = $self->_import_raw($raw_bytes, $type, $g, $p); + croak "FATAL: invalid public key" unless $self->_is_pubkey_valid; + return $rv; +} + +sub encrypt { + my ($self, $data, $hash_name) = @_; + $hash_name = Crypt::Digest::_trans_digest_name($hash_name||'SHA1'); + return $self->_encrypt($data, $hash_name); +} + +sub decrypt { + my ($self, $data) = @_; + return $self->_decrypt($data); +} + +sub sign_message { + my ($self, $data, $hash_name) = @_; + $hash_name ||= 'SHA1'; + my $data_hash = digest_data($hash_name, $data); + return $self->_sign($data_hash); +} + +sub verify_message { + my ($self, $sig, $data, $hash_name) = @_; + $hash_name ||= 'SHA1'; + my $data_hash = digest_data($hash_name, $data); + return $self->_verify($sig, $data_hash); +} + +sub sign_hash { + my ($self, $data_hash) = @_; + return $self->_sign($data_hash); +} + +sub verify_hash { + my ($self, $sig, $data_hash) = @_; + return $self->_verify($sig, $data_hash); +} + +sub generate_key { + my ($key,$param) = @_; + + if (!ref $param) { + if (my $dhparam = $DH_PARAMS{$param}) { + $param = $dhparam; + } else { + croak "FATAL: invalid key length" unless ($param >= 96 || $param <= 512); + return $key->_generate_key($param); + } + } + my $g = $param->{g} or croak "FATAL: 'g' param not specified"; + my $p = $param->{p} or croak "FATAL: 'p' param not specified"; + $g =~ s/^0x//; + $p =~ s/^0x//; + return $key->_generate_key_ex($g, $p); +} + +### FUNCTIONS + +sub dh_encrypt { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->encrypt(@_); +} + +sub dh_decrypt { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->decrypt(@_); +} + +sub dh_sign_message { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->sign_message(@_); +} + +sub dh_verify_message { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->verify_message(@_); +} + +sub dh_sign_hash { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->sign_hash(@_); +} + +sub dh_verify_hash { + my $key = shift; + $key = __PACKAGE__->new($key) unless ref $key; + carp "FATAL: invalid 'key' param" unless ref($key) eq __PACKAGE__; + return $key->verify_hash(@_); +} + +sub dh_shared_secret { + my ($privkey, $pubkey) = @_; + $privkey = __PACKAGE__->new($privkey) unless ref $privkey; + $pubkey = __PACKAGE__->new($pubkey) unless ref $pubkey; + carp "FATAL: invalid 'privkey' param" unless ref($privkey) eq __PACKAGE__ && $privkey->is_private; + carp "FATAL: invalid 'pubkey' param" unless ref($pubkey) eq __PACKAGE__; + return $privkey->shared_secret($pubkey); +} + +sub CLONE_SKIP { 1 } # prevent cloning + +1; + +=pod + +=head1 NAME + +Crypt::PK::DH - Public key cryptography based on Diffie-Hellman + +=head1 SYNOPSIS + + ### OO interface + + #Encryption: Alice + my $pub = Crypt::PK::DH->new('Bob_pub_dh1.key'); + my $ct = $pub->encrypt("secret message"); + # + #Encryption: Bob (received ciphertext $ct) + my $priv = Crypt::PK::DH->new('Bob_priv_dh1.key'); + my $pt = $priv->decrypt($ct); + + #Signature: Alice + my $priv = Crypt::PK::DH->new('Alice_priv_dh1.key'); + my $sig = $priv->sign_message($message); + # + #Signature: Bob (received $message + $sig) + my $pub = Crypt::PK::DH->new('Alice_pub_dh1.key'); + $pub->verify_message($sig, $message) or die "ERROR"; + + #Shared secret + my $priv = Crypt::PK::DH->new('Alice_priv_dh1.key'); + my $pub = Crypt::PK::DH->new('Bob_pub_dh1.key'); + my $shared_secret = $priv->shared_secret($pub); + + #Key generation + my $pk = Crypt::PK::DH->new(); + $pk->generate_key(128); + my $private = $pk->export_key('private'); + my $public = $pk->export_key('public'); + + or + + my $pk = Crypt::PK::DH->new(); + $pk->generate_key('ike2048'); + my $private = $pk->export_key('private'); + my $public = $pk->export_key('public'); + + or + + my $pk = Crypt::PK::DH->new(); + $pk->generate_key({ p => $p, g => $g }); + my $private = $pk->export_key('private'); + my $public = $pk->export_key('public'); + + ### Functional interface + + #Encryption: Alice + my $ct = dh_encrypt('Bob_pub_dh1.key', "secret message"); + #Encryption: Bob (received ciphertext $ct) + my $pt = dh_decrypt('Bob_priv_dh1.key', $ct); + + #Signature: Alice + my $sig = dh_sign_message('Alice_priv_dh1.key', $message); + #Signature: Bob (received $message + $sig) + dh_verify_message('Alice_pub_dh1.key', $sig, $message) or die "ERROR"; + + #Shared secret + my $shared_secret = dh_shared_secret('Alice_priv_dh1.key', 'Bob_pub_dh1.key'); + +=head1 METHODS + +=head2 new + + my $pk = Crypt::PK::DH->new(); + #or + my $pk = Crypt::PK::DH->new($priv_or_pub_key_filename); + #or + my $pk = Crypt::PK::DH->new(\$buffer_containing_priv_or_pub_key); + +=head2 generate_key + +Uses Yarrow-based cryptographically strong random number generator seeded with +random data taken from C</dev/random> (UNIX) or C<CryptGenRandom> (Win32). + + $pk->generate_key($keysize); + ### $keysize (in bytes) corresponds to DH params (p, g) predefined by libtomcrypt + # 96 => DH-768 + # 128 => DH-1024 + # 160 => DH-1280 + # 192 => DH-1536 + # 224 => DH-1792 + # 256 => DH-2048 + # 320 => DH-2560 + # 384 => DH-3072 + # 512 => DH-4096 + +The following variants are available since CryptX-0.032 + + $pk->generate_key($name) + ### $name corresponds to values defined in RFC7296 and RFC3526 + # ike768 => 768-bit MODP (Group 1) + # ike1024 => 1024-bit MODP (Group 2) + # ike1536 => 1536-bit MODP (Group 5) + # ike2048 => 2048-bit MODP (Group 14) + # ike3072 => 3072-bit MODP (Group 15) + # ike4096 => 4096-bit MODP (Group 16) + # ike6144 => 6144-bit MODP (Group 17) + # ike8192 => 8192-bit MODP (Group 18) + + $pk->generate_key($param_hash) + ## $param_hash is { g => $g, p => $p } + ## where $g is the generator (base) in a hex string and $p is the prime in a hex string + +=head2 import_key + +Loads private or public key (exported by L</export_key>). + + $pk->import_key($filename); + #or + $pk->import_key(\$buffer_containing_key); + +=head2 import_key_raw + +I<Since: CryptX-0.032> + + $pk->import_key_raw($raw_bytes, $type, $params) + ### $raw_bytes is a binary string containing the key + ### $type is either 'private' or 'public' + ### $param is either a name ('ike2038') or hash containing the p,g values { g=>$g, p=>$p } + ### in hex strings + +=head2 export_key + + my $private = $pk->export_key('private'); + #or + my $public = $pk->export_key('public'); + +=head2 export_key_raw + +I<Since: CryptX-0.032> + + $raw_bytes = $dh->export_key_raw('public') + #or + $raw_bytes = $dh->export_key_raw('private') + +=head2 encrypt + + my $pk = Crypt::PK::DH->new($pub_key_filename); + my $ct = $pk->encrypt($message); + #or + my $ct = $pk->encrypt($message, $hash_name); + + #NOTE: $hash_name can be 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest + +=head2 decrypt + + my $pk = Crypt::PK::DH->new($priv_key_filename); + my $pt = $pk->decrypt($ciphertext); + +=head2 sign_message + + my $pk = Crypt::PK::DH->new($priv_key_filename); + my $signature = $priv->sign_message($message); + #or + my $signature = $priv->sign_message($message, $hash_name); + + #NOTE: $hash_name can be 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest + +=head2 verify_message + + my $pk = Crypt::PK::DH->new($pub_key_filename); + my $valid = $pub->verify_message($signature, $message) + #or + my $valid = $pub->verify_message($signature, $message, $hash_name); + + #NOTE: $hash_name can be 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest + +=head2 sign_hash + + my $pk = Crypt::PK::DH->new($priv_key_filename); + my $signature = $priv->sign_hash($message_hash); + +=head2 verify_hash + + my $pk = Crypt::PK::DH->new($pub_key_filename); + my $valid = $pub->verify_hash($signature, $message_hash); + +=head2 shared_secret + + # Alice having her priv key $pk and Bob's public key $pkb + my $pk = Crypt::PK::DH->new($priv_key_filename); + my $pkb = Crypt::PK::DH->new($pub_key_filename); + my $shared_secret = $pk->shared_secret($pkb); + + # Bob having his priv key $pk and Alice's public key $pka + my $pk = Crypt::PK::DH->new($priv_key_filename); + my $pka = Crypt::PK::DH->new($pub_key_filename); + my $shared_secret = $pk->shared_secret($pka); # same value as computed by Alice + +=head2 is_private + + my $rv = $pk->is_private; + # 1 .. private key loaded + # 0 .. public key loaded + # undef .. no key loaded + +=head2 size + + my $size = $pk->size; + # returns key size in bytes or undef if no key loaded + +=head2 key2hash + + my $hash = $pk->key2hash; + + # returns hash like this (or undef if no key loaded): + { + type => 0, # integer: 1 .. private, 0 .. public + size => 256, # integer: key size in bytes + x => "FBC1062F73B9A17BB8473A2F5A074911FA7F20D28FB...", #private key + y => "AB9AAA40774D3CD476B52F82E7EE2D8A8D40CD88BF4...", #public key + g => "2", # generator/base + p => "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80D...", # prime +} + +=head2 params2hash + +I<Since: CryptX-0.032> + + my $params = $pk->params2hash; + + # returns hash like this (or undef if no key loaded): + { + g => "2", # generator/base + p => "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80D...", # prime +} + +=head1 FUNCTIONS + +=head2 dh_encrypt + +DH based encryption as implemented by libtomcrypt. See method L</encrypt> below. + + my $ct = dh_encrypt($pub_key_filename, $message); + #or + my $ct = dh_encrypt(\$buffer_containing_pub_key, $message); + #or + my $ct = dh_encrypt($pub_key_filename, $message, $hash_name); + + #NOTE: $hash_name can be 'SHA1' (DEFAULT), 'SHA256' or any other hash supported by Crypt::Digest + +Encryption works similar to the L<Crypt::PK::ECC> encryption whereas shared DH key is computed, and +the hash of the shared key XOR'ed against the plaintext forms the ciphertext. + +=head2 dh_decrypt + +DH based decryption as implemented by libtomcrypt. See method L</decrypt> below. + + my $pt = dh_decrypt($priv_key_filename, $ciphertext); + #or + my $pt = dh_decrypt(\$buffer_containing_priv_key, $ciphertext); + +=head2 dh_sign_message + +Generate DH signature as implemented by libtomcrypt. See method L</sign_message> below. + + my $sig = dh_sign_message($priv_key_filename, $message); + #or + my $sig = dh_sign_message(\$buffer_containing_priv_key, $message); + #or + my $sig = dh_sign_message($priv_key, $message, $hash_name); + +=head2 dh_verify_message + +Verify DH signature as implemented by libtomcrypt. See method L</verify_message> below. + + dh_verify_message($pub_key_filename, $signature, $message) or die "ERROR"; + #or + dh_verify_message(\$buffer_containing_pub_key, $signature, $message) or die "ERROR"; + #or + dh_verify_message($pub_key, $signature, $message, $hash_name) or die "ERROR"; + +=head2 dh_sign_hash + +Generate DH signature as implemented by libtomcrypt. See method L</sign_hash> below. + + my $sig = dh_sign_hash($priv_key_filename, $message_hash); + #or + my $sig = dh_sign_hash(\$buffer_containing_priv_key, $message_hash); + +=head2 dh_verify_hash + +Verify DH signature as implemented by libtomcrypt. See method L</verify_hash> below. + + dh_verify_hash($pub_key_filename, $signature, $message_hash) or die "ERROR"; + #or + dh_verify_hash(\$buffer_containing_pub_key, $signature, $message_hash) or die "ERROR"; + +=head2 dh_shared_secret + +DH based shared secret generation. See method L</shared_secret> below. + + #on Alice side + my $shared_secret = dh_shared_secret('Alice_priv_dh1.key', 'Bob_pub_dh1.key'); + + #on Bob side + my $shared_secret = dh_shared_secret('Bob_priv_dh1.key', 'Alice_pub_dh1.key'); + +=head1 SEE ALSO + +=over + +=item * L<https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange|https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange> + +=back |