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package Bitcoin::Crypto::Role::SignVerify; |
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$Bitcoin::Crypto::Role::SignVerify::VERSION = '2.000_01'; # TRIAL |
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$Bitcoin::Crypto::Role::SignVerify::VERSION = '2.00001'; |
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10522
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use v5.10; |
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use strict; |
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377
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use warnings; |
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524
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use Mooish::AttributeBuilder -standard; |
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use Type::Params -sigs; |
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7885
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use Bitcoin::Crypto::Types qw(Object Str ByteStr InstanceOf HashRef); |
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103
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63573
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use Bitcoin::Crypto::Helpers qw(carp_once); # load Math::BigInt |
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use Crypt::Digest::SHA256 qw(sha256); |
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774
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7688
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use Bitcoin::Crypto::Transaction::Sign; |
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581
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use Moo::Role; |
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12535
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use constant HAS_DETERMINISTIC_SIGNATURES => eval { require Crypt::Perl } && Crypt::Perl->VERSION gt '0.33'; |
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requires qw( |
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key_instance |
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_is_private |
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); |
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has field '_crypt_perl_prv' => ( |
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isa => InstanceOf ['Crypt::Perl::ECDSA::PrivateKey'], |
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lazy => sub { |
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require Crypt::Perl::ECDSA::Parse; |
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return Crypt::Perl::ECDSA::Parse::private($_[0]->key_instance->export_key_der('private')); |
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} |
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); |
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sub _fix_der_signature |
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{ |
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65
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my ($self, $signature) = @_; |
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return undef unless defined $signature; |
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# https://bitcoin.stackexchange.com/questions/92680/what-are-the-der-signature-and-sec-format |
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my $pos = 0; |
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21
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my $compound = substr $signature, $pos, 1; |
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$pos += 1; |
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21
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75
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my $total_len = unpack 'C', substr $signature, $pos, 1; |
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40
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$pos += 1; |
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21
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53
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my $int1 = substr $signature, $pos, 1; |
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$pos += 1; |
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49
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21
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46
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my $r_len = unpack 'C', substr $signature, $pos, 1; |
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$pos += 1; |
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52
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my $r = substr $signature, $pos, $r_len; |
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$pos += $r_len; |
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55
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my $int2 = substr $signature, $pos, 1; |
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$pos += 1; |
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58
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66
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my $s_len = unpack 'C', substr $signature, $pos, 1; |
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$pos += 1; |
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61
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155
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my $s = Math::BigInt->from_bytes(substr $signature, $pos, $s_len); |
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2689
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$pos += $s_len; |
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64
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21
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50
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77
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die 'invalid signature' |
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unless $pos == length $signature; |
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67
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# fixup $s - must be below order / 2 (BIP62) |
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101
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my $order = $self->curve_order; |
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100
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6264
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if ($s > $order->copy->btdiv(2)) { |
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8
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2894
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$s = $order - $s; |
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} |
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73
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21
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5546
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$s = $s->as_bytes; |
74
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50
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697
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if (unpack('C', $s) & 0x80) { |
75
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76
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# top bit is 1, so prepend with zero to avoid being interpreted as |
77
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# negative |
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0
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0
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$s = "\x00$s"; |
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} |
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81
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64
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$total_len = $total_len - $s_len + length $s; |
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50
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$s_len = length $s; |
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84
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208
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return join '', |
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$compound, |
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pack('C', $total_len), |
87
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$int1, |
88
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pack('C', $r_len), |
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$r, |
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$int2, |
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pack('C', $s_len), |
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$s, |
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; |
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} |
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96
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signature_for sign_message => ( |
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method => Object, |
98
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positional => [ByteStr], |
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); |
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101
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sub sign_message |
102
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{ |
103
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my ($self, $message) = @_; |
104
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105
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Bitcoin::Crypto::Exception::Sign->raise( |
106
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'cannot sign a message with a public key' |
107
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) unless $self->_is_private; |
108
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109
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$message = sha256($message); |
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111
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return Bitcoin::Crypto::Exception::Sign->trap_into( |
112
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sub { |
113
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my $signature; |
114
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if (HAS_DETERMINISTIC_SIGNATURES) { |
115
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$signature = $self->_crypt_perl_prv->sign_sha256($message); |
116
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} |
117
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else { |
118
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carp_once |
119
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'Current implementation of CryptX signature generation does not produce deterministic results. For better security, install the Crypt::Perl module.'; |
120
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$signature = $self->key_instance->sign_message($message, 'sha256'); |
121
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} |
122
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123
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return $self->_fix_der_signature($signature); |
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} |
125
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); |
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} |
127
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128
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signature_for sign_transaction => ( |
129
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method => Object, |
130
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positional => [ |
131
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InstanceOf ['Bitcoin::Crypto::Transaction'], |
132
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HashRef, {slurpy => !!1} |
133
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], |
134
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); |
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136
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sub sign_transaction |
137
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{ |
138
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my ($self, $transaction, $args) = @_; |
139
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140
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$args->{transaction} = $transaction; |
141
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$args->{key} = $self; |
142
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my $signer = Bitcoin::Crypto::Transaction::Sign->new($args); |
143
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$signer->sign; |
144
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145
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return; |
146
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} |
147
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148
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signature_for verify_message => ( |
149
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method => Object, |
150
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positional => [ByteStr, ByteStr], |
151
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); |
152
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153
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sub verify_message |
154
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{ |
155
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my ($self, $message, $signature, $algorithm) = @_; |
156
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$message = sha256($message); |
157
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158
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return Bitcoin::Crypto::Exception::Verify->trap_into( |
159
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sub { |
160
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$self->key_instance->verify_message($signature, $message, 'sha256'); |
161
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} |
162
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); |
163
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} |
164
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165
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1; |
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