Imports System.Security.Cryptography
Imports System.Numerics
Module ValidateBitCoinAddress
Function isValidBitcoinAddress(s As String) As Boolean
Dim regExPattern As String = "[a-zA-Z1-9]{27,35}$"
If MatchString(s, regExPattern) Then
If get_bcaddress_version(s) <> "" Then
isValidBitcoinAddress = True
Else
isValidBitcoinAddress = False
End If
Else
isValidBitcoinAddress = False
End If
End Function
Function MatchString(ByVal str As String, ByVal regexstr As String) As Boolean
str = str.Trim()
Dim pattern As New System.Text.RegularExpressions.Regex(regexstr)
Return pattern.IsMatch(str)
End Function
Function get_bcaddress_version(strAddress) As String
Dim addr As Byte()
Dim version As Byte
Dim checksum(3) As Byte
Dim h3(3) As Byte
Dim x As Integer
addr = b58decode(strAddress, 25)
If IsNothing(addr) Then
'fail
get_bcaddress_version = ""
Exit Function
End If
Dim lenAddr As Integer = addr.GetLength(0)
Dim vh160(lenAddr - 5) As Byte
Dim sha As New SHA256Managed()
version = addr(0)
checksum = {addr(lenAddr - 4), addr(lenAddr - 3), addr(lenAddr - 2), addr(lenAddr - 1)}
For x = 0 To vh160.GetLength(0) - 1
vh160(x) = addr(x)
Next
Dim Hash() As Byte = sha.ComputeHash(vh160)
Dim SecondHash() As Byte = sha.ComputeHash(Hash)
h3 = {SecondHash(0), SecondHash(1), SecondHash(2), SecondHash(3)}
If h3(0) = checksum(0) And h3(1) = checksum(1) And h3(2) = checksum(2) And h3(3) = checksum(3) Then
get_bcaddress_version = version.ToString
Else
'fail
get_bcaddress_version = ""
End If
End Function
Function b58encode(b() As Byte) As String
Dim b58chars As String = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
Dim b58base As BigInteger = 58
Dim x As BigInteger
Dim long_value As BigInteger = 0
Dim result As String = ""
Dim iMod As BigInteger = 0
Dim iDiv As BigInteger = 0
Dim b256base As BigInteger = 256
Dim c As Integer
Dim lv As Integer
lv = b.GetLength(0) - 1
c = 0
For x = lv To 0 Step -1
long_value = long_value + BigInteger.Pow(b256base, x) * b(c)
c = c + 1
Next
Do While long_value >= b58base
iMod = long_value Mod b58base
iDiv = long_value / b58base
result = b58chars(iMod) & result
long_value = iDiv
Loop
result = b58chars(long_value) & result
For x = 0 To lv
If b(x) = CByte(0) Then
result = b58chars(0) & result
Else
Exit For
End If
Next
Return result
End Function
Function insertat(b As Byte, bArr As Byte(), pos As Integer) As Byte()
If IsNothing(bArr) Then
'empty array; return single celled array
Dim tmpsomeOtherBarr(0) As Byte
tmpsomeOtherBarr(0) = b
insertat = tmpsomeOtherBarr
Exit Function
End If
Dim x As Integer
Dim tmpbArr(bArr.GetLength(0)) As Byte
If pos = -1 Then
'insert at end of array
For x = 0 To bArr.GetLength(0) - 1
tmpbArr(x) = bArr(x)
Next
tmpbArr(bArr.GetLength(0)) = b
Return tmpbArr
ElseIf pos = 0 Then
'insert at beginning
tmpbArr(0) = b
For x = 1 To bArr.GetLength(0)
tmpbArr(x) = bArr(x - 1)
Next
Return tmpbArr
Else
'insert in the middle
For x = 0 To pos - 1
tmpbArr(x) = bArr(x)
Next
tmpbArr(pos) = b
For x = pos + 1 To bArr.GetLength(0)
tmpbArr(x) = bArr(x)
Next
Return tmpbArr
End If
End Function
Function b58decode(v As String, l As Integer) As Byte()
Dim b58chars As String = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
Dim b58base As BigInteger = 58
Dim long_value As BigInteger = 0
Dim lv As Integer
Dim c As Integer
Dim x As BigInteger
Dim biPos As BigInteger = 0
Dim iMod As BigInteger = 0
Dim iDiv As BigInteger = 0
Dim result() As Byte
lv = Len(v) - 1
For x = lv To 0 Step -1
c = c + 1
biPos = b58chars.IndexOf(Mid(v, c, 1))
long_value = long_value + BigInteger.Pow(b58base, x) * biPos
Next
Do While long_value >= 256
iMod = long_value Mod 256
iDiv = long_value / 256
result = insertat(CByte(iMod), result, 0)
long_value = iDiv
Loop
result = insertat(CByte(long_value), result, 0)
For x = 1 To Len(v)
If Mid(v, x, 1) = b58chars(0) Then
result = insertat(CByte(0), result, 0)
Else
Exit For
End If
Next
If l > 0 And result.GetLength(0) <> l Then
Return Nothing
Else
Return result
End If
End Function
End Module
base58=({1..9} {A..H} {J..N} {P..Z} {a..k} {m..z})
bitcoinregex="^[$(printf "%s" "${base58[@]}")]{34}$"
decodeBase58() {
local s=$1
for i in {0..57}
do s="${s//${base58[i]}/ $i}"
done
dc <<< "16o0d${s// /+58*}+f"
}
checksum() {
xxd -p -r <<<"$1" |
openssl dgst -sha256 -binary |
openssl dgst -sha256 -binary |
xxd -p -c 80 |
head -c 8
}
checkBitcoinAddress() {
if [[ "$1" =~ $bitcoinregex ]]
then
h=$(decodeBase58 "$1")
checksum "00${h::${#h}-8}" |
grep -qi "^${h: -8}$"
else return 2
fi
}
$btc = decode_btc('1Eym7pyJcaambv8FG4ZoU8A4xsiL9us2zz');
var_dump($btc);
var_dump(encode_btc($btc));
$btc = decode_btc('1111111111111111111114oLvT2');
var_dump($btc);
var_dump(encode_btc($btc));
function hash_sha256($string) {
if (function_exists('hash')) return hash('sha256', $string, true);
if (function_exists('mhash')) return mhash(MHASH_SHA256, $string);
// insert native php implementation of sha256 here
throw new Exception('Too lazy to fallback when the guy who configured php was lazy too');
}
function encode_btc($btc) {
$btc = chr($btc['version']).pack('H*', $btc['hash']);
if (strlen($btc) != 21) return false;
$cksum = substr(hash_sha256(hash_sha256($btc)), 0, 4);
return base58_encode($btc.$cksum);
}
function decode_btc($btc) {
$btc = base58_decode($btc);
if (strlen($btc) != 25) return false; // invalid
$version = ord($btc[0]);
$cksum = substr($btc, -4);
// checksum is double sha256 (take 4 first bytes of result)
$good_cksum = substr(hash_sha256(hash_sha256(substr($btc, 0, -4))), 0, 4);
if ($cksum != $good_cksum) return false;
return array('version' => $version, 'hash' => bin2hex(substr($btc, 1, 20)));
}
function base58_encode($string) {
$table = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
$long_value = gmp_init(bin2hex($string), 16);
$result = '';
while(gmp_cmp($long_value, 58) > 0) {
list($long_value, $mod) = gmp_div_qr($long_value, 58);
$result .= $table[gmp_intval($mod)];
}
$result .= $table[gmp_intval($long_value)];
for($nPad = 0; $string[$nPad] == "\0"; ++$nPad);
return str_repeat($table[0], $nPad).strrev($result);
}
function base58_decode($string) {
$table = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
static $table_rev = null;
if (is_null($table_rev)) {
$table_rev = array();
for($i=0;$i<58;++$i) $table_rev[$table[$i]]=$i;
}
$l = strlen($string);
$long_value = gmp_init('0');
for($i=0;$i<$l;++$i) {
$c=$string[$l-$i-1];
$long_value = gmp_add($long_value, gmp_mul($table_rev[$c], gmp_pow(58, $i)));
}
// php is lacking binary output for gmp
$res = pack('H*', gmp_strval($long_value, 16));
for($nPad = 0; $string[$nPad] == $table[0]; ++$nPad);
return str_repeat("\0", $nPad).$res;
}
