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193 lines
4.0 KiB
193 lines
4.0 KiB
![]()
5 years ago
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#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Digest::MD5 qw (md5);
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use Crypt::CBC;
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sub module_constraints { [[0, 256], [8, 8], [0, 31], [8, 8], [-1, -1]] }
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my $BASE58_CHARS = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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my $BITCOINJ_CHARS = ".abcdefghijklmnopqrstuvwxyz";
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sub module_generate_hash
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{
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my $word = shift;
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my $salt = shift;
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my $data = shift;
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my $word_salt = $word . $salt;
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my $key1 = md5 ( $word_salt);
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my $key2 = md5 ($key1 . $word_salt);
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my $iv = md5 ($key2 . $word_salt);
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my $aes_cbc = Crypt::CBC->new ({
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cipher => "Crypt::Rijndael",
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iv => $iv,
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key => $key1 . $key2,
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keysize => 32,
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literal_key => 1,
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header => "none",
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padding => "none"
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});
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my $type = 0; # 0: MultiBit Classic MD5, 1: KnCGroup Bitcoin Wallet, 2: bitcoinj
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my $key = "";
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if (! defined ($data))
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{
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$type = random_number (0, 2);
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if ($type == 0)
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{
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my @chars_at_start = ('K', 'L', 'Q', '5');
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$data = $chars_at_start[random_number (0, scalar (@chars_at_start) - 1)];
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for (my $i = 1; $i < 32; $i++)
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{
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$data .= substr ($BASE58_CHARS, random_number (0, length ($BASE58_CHARS) - 1), 1);
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}
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}
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elsif ($type == 1)
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{
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$data = "\n";
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$data .= chr (random_number (0, 127));
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$data .= "org.";
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for (my $i = 6; $i < 32; $i++)
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{
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$data .= substr ($BITCOINJ_CHARS, random_number (0, length ($BITCOINJ_CHARS) - 1), 1);
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}
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}
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elsif ($type == 2)
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{
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# Full string would be:
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# "# KEEP YOUR PRIVATE KEYS SAFE! Anyone who can read this can spend your Bitcoins."
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$data = '# KEEP YOUR PRIVATE KEYS SAFE! A';
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}
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$key = $aes_cbc->encrypt ($data);
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}
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else
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{
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$key = $aes_cbc->decrypt ($data);
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# verification step:
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# first char of $key must be K, L, Q, 5, # or \n
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my $char_at_start = substr ($key, 0, 1);
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if (($char_at_start eq 'K') ||
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($char_at_start eq 'L') ||
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($char_at_start eq 'Q') ||
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($char_at_start eq '5'))
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{
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my $error = 0;
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for (my $i = 1; $i < 32; $i++) # start with 1 (we already checked first char)
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{
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my $c = substr ($key, $i, 1);
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my $idx = index ($BASE58_CHARS, $c);
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next if ($idx >= 0);
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$error = 1;
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last;
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}
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if ($error == 0)
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{
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$key = $data;
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}
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}
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elsif ($char_at_start eq "\n") # bitcoinj
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{
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my $second_char = substr ($key, 1, 1);
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if (ord ($second_char) < 128)
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{
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if (substr ($key, 2, 4) eq "org.")
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{
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my $error = 0;
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for (my $i = 6; $i < 14; $i++) # start with 6 (we already checked first chars)
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{
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my $c = substr ($key, $i, 1);
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my $idx = index ($BITCOINJ_CHARS, $c);
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next if ($idx >= 0);
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$error = 1;
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last;
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}
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if ($error == 0)
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{
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$key = $data;
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}
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}
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}
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}
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elsif ($char_at_start eq '#') # KnCGroup Bitcoin Wallet
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{
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if (substr ($key, 0, 16) eq '# KEEP YOUR PRIV')
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{
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$key = $data;
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}
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}
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}
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my $hash = sprintf ("\$multibit\$1*%s*%s", unpack ("H*", $salt), unpack ("H*", $key));
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return $hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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my $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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return unless substr ($hash, 0, 12) eq '$multibit$1*';
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$idx = index ($hash, '*', 12);
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return unless $idx == 28;
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my $salt_hex = substr ($hash, 12, 16); # 28 - 12 = 16
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my $data_hex = substr ($hash, 29);
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return unless length ($salt_hex) == 16;
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return unless length ($data_hex) == 64;
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my $salt = pack ("H*", $salt_hex);
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my $data = pack ("H*", $data_hex);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $salt, $data);
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return ($new_hash, $word);
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}
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1;
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