Topic: How to generate the hash of public key in Bitcoin (Read 171 times)
updated with code, now gets an error
Public keys are not hexadecimal, this is an actual bitcoin public address :
Quote
mwZVuA4D5TSSymdXZza4S1YhZFnH2fcaeG
see it's not a hexadecimal there is a difference between "public key" and an "address" or if you like public address. public key is an x,y coordinate of a point located on the elliptic curve while address is a base58 encoding of hash of the public key.
what you posted here is a testnet address and it is using base58 encoding. (you still should use Unicode to decode this)
however public keys are usually presented in base-16 or hexadecimal format. additionally in your code the variable called public_key is indeed a public key and is indeed using hexadecimal encoding.
Thank you for the explanation I didn't know that, but I changed the code to convert it to byte array from hex string. then it gives me this error. I think it's because of the odd number of characters of the public key
Quote
System.ArgumentOutOfRangeException: 'Index and length must refer to a location within the string.
Parameter name: length'
Parameter name: length'
Public keys are not hexadecimal, this is an actual bitcoin public address :
Quote
mwZVuA4D5TSSymdXZza4S1YhZFnH2fcaeG
see it's not a hexadecimal there is a difference between "public key" and an "address" or if you like public address. public key is an x,y coordinate of a point located on the elliptic curve while address is a base58 encoding of hash of the public key.
what you posted here is a testnet address and it is using base58 encoding. (you still should use Unicode to decode this)
however public keys are usually presented in base-16 or hexadecimal format. additionally in your code the variable called public_key is indeed a public key and is indeed using hexadecimal encoding.
Public keys are not hexadecimal, this is an actual bitcoin public address :
Quote
mwZVuA4D5TSSymdXZza4S1YhZFnH2fcaeG
see it's not a hexadecimal Quote
Code:
Dim public_key as String = "2b4632d08485ff1df2db55b9dafd23347d1c47a457072a1e87be26896549a8737"
Dim bytes As Byte() = System.Text.Encoding.Unicode.GetBytes(public_key)
your "public_key" variable is a hexadecimal string not a Unicode string and that means your initial byte array that you hash is the wrong value.
you already have a function called "HexStringToByteArray", i'm not sure if it is a correct conversion but if it is then use that instead of "System.Text.Encoding.Unicode.GetBytes"
I'm trying to hash the public key with SHA256 and then ripemed160 and get the hash. but it gives the error "System.ArgumentOutOfRangeException: 'Index and length must refer to a location within the string. Parameter name: length'" I think it's because of the odd number of characters of the public key.
Public key: 2b4632d08485ff1df2db55b9dafd23347d1c47a457072a1e87be26896549a8737
Hash should be: 93ce48570b55c42c2af816aeaba06cfee1224fae
what I want to achieve is : bitcoin Public key --> SHA256 --> RIPEMD160 = final hash
Public key: 2b4632d08485ff1df2db55b9dafd23347d1c47a457072a1e87be26896549a8737
Hash should be: 93ce48570b55c42c2af816aeaba06cfee1224fae
Code:
Imports System.Security.Cryptography
Imports System.Text
Imports System.Globalization
Imports System.Numerics
Private Function HexStringToByteArray(ByVal shex As String) As Byte()
Dim B As Byte() = Enumerable.Range(0, shex.Length).Where(Function(x) x Mod 2 = 0).[Select](Function(x) Convert.ToByte(shex.Substring(x, 2), 16)).ToArray()
Return Enumerable.Range(0, shex.Length).Where(Function(x) x Mod 2 = 0).[Select](Function(x) Convert.ToByte(shex.Substring(x, 2), 16)).ToArray()
End Function
Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click
Dim public_key as String = "2b4632d08485ff1df2db55b9dafd23347d1c47a457072a1e87be26896549a8737"
Dim pubkey_hash As String
Dim sha256 As SHA256 = SHA256Managed.Create()
Dim bytes As Byte() = HexStringToByteArray(public_key)
Dim hash As Byte() = sha256.ComputeHash(bytes)
Dim stringBuilder1 As New StringBuilder()
For i As Integer = 0 To hash.Length - 1
stringBuilder1.Append(hash(i).ToString("X2"))
Next
bytes = HexStringToByteArray(stringBuilder1.ToString())
Dim ripemd160 As RIPEMD160 = RIPEMD160Managed.Create()
Dim hash_160 As Byte() = ripemd160.ComputeHash(bytes)
Dim stringBuilder2 As New StringBuilder()
For i As Integer = 0 To hash_160.Length - 1
stringBuilder2.Append(hash_160(i).ToString("X2"))
Next
Dim arr() As Char = stringBuilder2.ToString
pubkey_hash = arr.tostring
TextBox14.Text = pubkey_hash
End Sub
what I want to achieve is : bitcoin Public key --> SHA256 --> RIPEMD160 = final hash
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